feat(java): add selectable formatting profiles

Cargo.lock

@@ -4374,6 +4374,7 @@ dependencies = [
  "ide-jsonrpc",
  "ide-language",
  "ide-text",
+ "ide-vfs",
  "ignore",
  "lsp-types",
  "parking_lot",

crates/ide-core/src/editor_settings.rs

@@ -371,6 +371,12 @@ pub struct TextAttributesOverride {
 #[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize, Type)]
 #[serde(default, rename_all = "camelCase")]
 pub struct LanguageCodeStyle {
+    /// Java formatter: `default` | `intellij` | `custom` (other languages ignore it).
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub formatter: Option<String>,
+    /// Eclipse formatter XML; relative paths start at the project root.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub formatter_path: Option<String>,
     #[serde(skip_serializing_if = "Option::is_none")]
     pub use_tab: Option<bool>,
     #[serde(skip_serializing_if = "Option::is_none")]

crates/ide-host/src/ops/project.rs

@@ -172,9 +172,12 @@ pub fn set_settings(
         host.apply_proxy();
     }
     // A new interpreter / toolchain / server executable restarts the language servers it affects.
-    if ["languages", "tools", "languageServers", "projectStructure"]
-        .iter()
-        .any(|k| key == *k || key.starts_with(&format!("{k}.")))
+    if key == "editor"
+        || key == "editor.codeStyle"
+        || key.starts_with("editor.codeStyle.")
+        || ["languages", "tools", "languageServers", "projectStructure"]
+            .iter()
+            .any(|k| key == *k || key.starts_with(&format!("{k}.")))
     {
         for project in affected() {
             if let Some(bridge) = &project.kotlin_bridge {

crates/ide-host/src/project.rs

@@ -129,6 +129,8 @@ impl Host {
             let root = root.clone();
             let data_dir = self.data_dir.clone();
             let config_dir = self.config_dir.clone();
+            let sink = sink.clone();
+            let formatter_problem = std::sync::Mutex::new(None);
             lsp.set_config_hook(Box::new(move |cfg, server_root| {
                 let member = ide_workspace::workspace::Workspace::load(&root).ok().flatten().and_then(|w| {
                     w.projects.into_iter().filter(|p| server_root.starts_with(p)).max_by_key(|p| p.components().count())
@@ -142,6 +144,27 @@ impl Host {
                 ide_sdk::apply::configure_server(cfg, root, server_root, &effective);
                 ide_sdk::java::cap_java_home(cfg, &ide_sdk::java::installed_jdks());
                 if cfg.name == "jdtls" {
+                    let problem = ide_lsp::jdtls::configure_formatter(
+                        cfg,
+                        effective.editor.code_style.languages.get("java"),
+                        root,
+                        &data_dir,
+                        effective.language_servers.get("jdtls"),
+                    )
+                    .err()
+                    .map(|e| e.to_string());
+                    let mut previous = formatter_problem.lock().unwrap();
+                    if problem != *previous {
+                        if let Some(body) = &problem {
+                            sink.emit(IdeEvent::Notify {
+                                level: ide_core::event::NotifyLevel::Warning,
+                                title: "Java formatter configuration unavailable".into(),
+                                body: Some(body.clone()),
+                            });
+                        }
+                        *previous = problem;
+                    }
+                    drop(previous);
                     ide_lsp::jdtls::configure_source_paths(
                         cfg,
                         ide_workspace::roots::unmanaged_java_source_paths(

crates/ide-lsp/Cargo.toml

@@ -7,6 +7,7 @@ license.workspace = true
 
 [dependencies]
 ide-core.workspace = true
+ide-vfs.workspace = true
 dunce.workspace = true
 ide-text.workspace = true
 ide-language.workspace = true

crates/ide-lsp/src/jdtls.rs

@@ -17,6 +17,9 @@ use std::sync::Arc;
 use std::time::{Duration, Instant};
 
 const SERVER: &str = "jdtls";
+
+mod formatter;
+pub use formatter::configure_formatter;
 /// First start imports the Maven / Gradle model, which can take minutes.
 const READY_TIMEOUT: Duration = Duration::from_secs(240);
 /// A workspace build of a large multi-module project can take far longer than

crates/ide-lsp/src/jdtls/formatter.rs

@@ -0,0 +1,224 @@
+use ide_core::IdeResult;
+use ide_core::editor_settings::LanguageCodeStyle;
+use ide_core::settings::LanguageServerSettings;
+use ide_language::LanguageServerConfig;
+use serde_json::json;
+use std::path::Path;
+
+const PROFILE: &str = "OpenIDEA IntelliJ IDEA";
+const XML: &str = include_str!("intellij.xml");
+
+/// Protocol settings only: switching profiles reaches a running jdtls through
+/// didChangeConfiguration. Explicit language-server settings are applied later.
+pub fn configure_formatter(
+    cfg: &mut LanguageServerConfig,
+    style: Option<&LanguageCodeStyle>,
+    project_root: &Path,
+    data_dir: &Path,
+    overrides: Option<&LanguageServerSettings>,
+) -> IdeResult<()> {
+    if cfg.name != "jdtls" {
+        return Ok(());
+    }
+    // jdtls retains omitted preferences. Send empty values when returning to
+    // Default, while preserving any profile from the base server configuration.
+    let inherited = crate::handler::all_settings(cfg);
+    let defaults = json!({
+        "url": inherited.pointer("/java/format/settings/url").cloned().unwrap_or(json!("")),
+        "profile": inherited.pointer("/java/format/settings/profile").cloned().unwrap_or(json!("")),
+    });
+    let mut settings = cfg.settings.take().unwrap_or_else(|| json!({}));
+    settings["java"]["format"]["settings"] = formatter_overrides(defaults, overrides);
+    cfg.settings = Some(settings);
+    let Some(style) = style else { return Ok(()) };
+    let (path, profile) = match style.formatter.as_deref() {
+        Some("intellij") => {
+            let path = data_dir.join("lsp/jdtls/intellij.xml");
+            std::fs::create_dir_all(path.parent().unwrap())?;
+            if std::fs::read_to_string(&path).ok().as_deref() != Some(XML) {
+                ide_vfs::write_atomic(&path, XML.as_bytes())?;
+            }
+            (path, PROFILE)
+        }
+        Some("custom") => {
+            let value = style.formatter_path.as_deref().unwrap_or_default().trim();
+            if value.is_empty() {
+                return Err(ide_core::IdeError::invalid("Choose an Eclipse formatter XML file."));
+            }
+            let path = project_root.join(value);
+            // Fail without poisoning the server launch; code intelligence remains available.
+            std::fs::File::open(&path).map_err(|error| {
+                let path = path.display();
+                ide_core::IdeError::invalid(format!("Cannot read Java formatter XML {path}: {error}"))
+            })?;
+            if !path.is_file() {
+                return Err(ide_core::IdeError::invalid(format!("Not a formatter XML file: {}", path.display())));
+            }
+            (path, "")
+        }
+        _ => return Ok(()),
+    };
+    let mut settings = cfg.settings.take().unwrap_or_else(|| json!({}));
+    settings["java"]["format"]["settings"] = formatter_overrides(
+        json!({
+            "url": crate::uri::path_to_uri_string(&path),
+            "profile": profile,
+        }),
+        overrides,
+    );
+    cfg.settings = Some(settings);
+    Ok(())
+}
+
+fn formatter_overrides(mut format: serde_json::Value, overrides: Option<&LanguageServerSettings>) -> serde_json::Value {
+    if let Some(overrides) = overrides {
+        // all_settings merges protocol settings over initializationOptions.
+        // Mirror explicit formatter keys so generated protocol values cannot
+        // accidentally mask an advanced initializationOptions override.
+        for layer in [
+            overrides.initialization_options.as_ref().and_then(|v| v.pointer("/settings/java/format/settings")),
+            overrides.settings.as_ref().and_then(|v| v.pointer("/settings/java/format/settings")),
+            overrides.settings.as_ref().and_then(|v| v.pointer("/java/format/settings")),
+        ]
+        .into_iter()
+        .flatten()
+        {
+            for key in ["url", "profile"] {
+                if let Some(value) = layer.get(key) {
+                    format[key] = value.clone();
+                }
+            }
+        }
+    }
+    format
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn config(name: &str) -> LanguageServerConfig {
+        serde_json::from_value(json!({"name": name, "command": name})).unwrap()
+    }
+
+    #[test]
+    fn profiles_resolve_paths_preserve_settings_and_leave_other_servers_alone() {
+        let dir = tempfile::tempdir().unwrap();
+        let root = dir.path().join("project with 空格");
+        let data = dir.path().join("data");
+        std::fs::create_dir_all(&root).unwrap();
+        let custom = root.join("style.xml");
+        std::fs::write(&custom, XML).unwrap();
+        for name in ["jdtls", "rust-analyzer"] {
+            for mode in ["default", "intellij", "custom", "unknown"] {
+                let mut cfg = LanguageServerConfig {
+                    name: name.into(),
+                    settings: Some(json!({"java": {"autobuild": {"enabled": false}}})),
+                    ..config(name)
+                };
+                let initial = cfg.clone();
+                let style = LanguageCodeStyle {
+                    formatter: Some(mode.into()),
+                    formatter_path: Some("style.xml".into()),
+                    ..Default::default()
+                };
+                configure_formatter(&mut cfg, Some(&style), &root, &data, None).unwrap();
+                if name != "jdtls" {
+                    assert_eq!(cfg, initial);
+                    continue;
+                }
+                let settings = crate::handler::all_settings(&cfg);
+                if !["intellij", "custom"].contains(&mode) {
+                    assert_eq!(settings["java"]["format"]["settings"], json!({"url": "", "profile": ""}));
+                    continue;
+                }
+                let path = if mode == "custom" { custom.clone() } else { data.join("lsp/jdtls/intellij.xml") };
+                assert_eq!(settings["java"]["format"]["settings"]["url"], crate::uri::path_to_uri_string(&path));
+                assert_eq!(
+                    settings["java"]["format"]["settings"]["profile"],
+                    if mode == "custom" { "" } else { PROFILE }
+                );
+                assert_eq!(settings["java"]["autobuild"]["enabled"], false);
+                assert_eq!(std::fs::read_to_string(path).unwrap(), XML);
+            }
+        }
+    }
+
+    #[test]
+    fn unavailable_custom_paths_are_nonfatal_and_do_not_set_launch_error() {
+        let dir = tempfile::tempdir().unwrap();
+        for path in ["", "missing.xml", "."] {
+            let mut cfg = config("jdtls");
+            let style = LanguageCodeStyle {
+                formatter: Some("custom".into()),
+                formatter_path: Some(path.into()),
+                ..Default::default()
+            };
+            assert!(configure_formatter(&mut cfg, Some(&style), dir.path(), dir.path(), None).is_err());
+            assert!(cfg.launch_error.is_none());
+            assert_eq!(crate::handler::all_settings(&cfg)["java"]["format"]["settings"]["url"], "");
+        }
+    }
+
+    #[test]
+    fn default_keeps_explicit_server_configuration_and_custom_accepts_absolute_paths() {
+        let dir = tempfile::tempdir().unwrap();
+        let path = dir.path().join("custom.xml");
+        std::fs::write(&path, XML).unwrap();
+        let mut cfg = config("jdtls");
+        cfg.initialization_options = Some(
+            toml::Value::try_from(json!({
+                "settings": {"java": {"format": {"settings": {"url": "existing.xml", "profile": "Existing"}}}}
+            }))
+            .unwrap(),
+        );
+        configure_formatter(&mut cfg, None, dir.path(), dir.path(), None).unwrap();
+        assert_eq!(
+            crate::handler::all_settings(&cfg)["java"]["format"]["settings"],
+            json!({"url": "existing.xml", "profile": "Existing"})
+        );
+        let style = LanguageCodeStyle {
+            formatter: Some("custom".into()),
+            formatter_path: Some(path.to_string_lossy().into_owned()),
+            ..Default::default()
+        };
+        configure_formatter(&mut cfg, Some(&style), &dir.path().join("different-root"), dir.path(), None).unwrap();
+        assert_eq!(
+            crate::handler::all_settings(&cfg)["java"]["format"]["settings"]["url"],
+            crate::uri::path_to_uri_string(&path)
+        );
+    }
+    #[test]
+    fn advanced_formatter_options_win_for_each_profile_and_protocol_layer() {
+        let dir = tempfile::tempdir().unwrap();
+        std::fs::write(dir.path().join("custom.xml"), XML).unwrap();
+        for mode in ["default", "intellij", "custom"] {
+            for layer in ["initialization", "wrapped", "direct"] {
+                let mut overrides = LanguageServerSettings {
+                    initialization_options: Some(json!({"settings": {"java": {"format": {"settings": {
+                        "url": "advanced.xml", "profile": "Advanced"
+                    }}}}})),
+                    ..Default::default()
+                };
+                if layer != "initialization" {
+                    let value = json!({"java": {"format": {"settings": {"profile": "Protocol"}}}});
+                    overrides.settings = Some(if layer == "wrapped" { json!({"settings": value}) } else { value });
+                }
+                let mut cfg = config("jdtls");
+                let style = LanguageCodeStyle {
+                    formatter: Some(mode.into()),
+                    formatter_path: Some("custom.xml".into()),
+                    ..Default::default()
+                };
+                configure_formatter(&mut cfg, Some(&style), dir.path(), dir.path(), Some(&overrides)).unwrap();
+                assert_eq!(
+                    crate::handler::all_settings(&cfg)["java"]["format"]["settings"],
+                    json!({
+                        "url": "advanced.xml",
+                        "profile": if layer == "initialization" { "Advanced" } else { "Protocol" },
+                    })
+                );
+            }
+        }
+    }
+}

crates/ide-lsp/src/jdtls/intellij.xml

@@ -0,0 +1,231 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  IntelliJ IDEA Java defaults, approximated using Eclipse JDT formatter options.
+  Source revision: JetBrains/intellij-community 8fe3709d185cd13053d17b76d9690aef674d4268
+  platform/code-style-api/src/com/intellij/psi/codeStyle/CommonCodeStyleSettings.java
+  platform/code-style-api/src/com/intellij/psi/codeStyle/CodeStyleSettings.java
+  platform/code-style-api/src/com/intellij/psi/codeStyle/CodeStyleDefaults.java
+  java/java-frontback-impl/src/com/intellij/psi/codeStyle/JavaCodeStyleSettings.java
+  JavaLanguageCodeStyleSettingsProvider.customizeDefaults does not override these values.
+  https://www.jetbrains.com/help/idea/code-style-java.html describes the corresponding controls.
+  Each option below names its IDEA setting; JDT has no exact equivalent for every rule.
+  A formatter profile does not sort/group imports (Organize Imports is a separate action).
+  JDT limitation: NO_SPLIT can join existing parameter/call/chain line breaks even with
+  join_wrapped_lines=false. Column alignment applies where a break survives (e.g. comments).
+  The comment width 999999 approximates WRAP_COMMENTS=false without JDT integer overflow.
+  JDT has a shared blank-line preservation limit and different empty-body/Javadoc handling.
+-->
+<profiles version="23">
+  <profile kind="CodeFormatterProfile" name="OpenIDEA IntelliJ IDEA" version="23">
+    <!-- IndentOptions.USE_TAB_CHARACTER = false -->
+    <setting id="org.eclipse.jdt.core.formatter.tabulation.char" value="space"/>
+    <!-- IndentOptions.TAB_SIZE = 4 -->
+    <setting id="org.eclipse.jdt.core.formatter.tabulation.size" value="4"/>
+    <!-- IndentOptions.INDENT_SIZE = 4 -->
+    <setting id="org.eclipse.jdt.core.formatter.indentation.size" value="4"/>
+    <!-- IndentOptions.CONTINUATION_INDENT_SIZE = 8 (two 4-space units) -->
+    <setting id="org.eclipse.jdt.core.formatter.continuation_indentation" value="2"/>
+    <!-- IndentOptions.CONTINUATION_INDENT_SIZE = 8 -->
+    <setting id="org.eclipse.jdt.core.formatter.continuation_indentation_for_array_initializer" value="2"/>
+    <!-- CodeStyleSettings.RIGHT_MARGIN = 120; WRAP_LONG_LINES = false; wrapping below is disabled -->
+    <setting id="org.eclipse.jdt.core.formatter.lineSplit" value="120"/>
+    <!-- KEEP_LINE_BREAKS = true -->
+    <setting id="org.eclipse.jdt.core.formatter.join_wrapped_lines" value="false"/>
+    <!-- KEEP_BLANK_LINES_IN_DECLARATIONS / IN_CODE / BEFORE_RBRACE = 2 (JDT has one shared limit) -->
+    <setting id="org.eclipse.jdt.core.formatter.number_of_empty_lines_to_preserve" value="2"/>
+    <!-- METHOD_PARAMETERS_WRAP = DO_NOT_WRAP; ALIGN_MULTILINE_PARAMETERS = true (indent on column, no automatic wrap) -->
+    <setting id="org.eclipse.jdt.core.formatter.alignment_for_parameters_in_method_declaration" value="2"/>
+    <!-- METHOD_PARAMETERS_WRAP = DO_NOT_WRAP; ALIGN_MULTILINE_PARAMETERS = true (indent on column, no automatic wrap) -->
+    <setting id="org.eclipse.jdt.core.formatter.alignment_for_parameters_in_constructor_declaration" value="2"/>
+    <!-- CALL_PARAMETERS_WRAP / ANNOTATION_PARAMETER_WRAP = DO_NOT_WRAP; ALIGN_MULTILINE_PARAMETERS_IN_CALLS = false -->
+    <setting id="org.eclipse.jdt.core.formatter.alignment_for_arguments_in_method_invocation" value="0"/>
+    <!-- CALL_PARAMETERS_WRAP / ANNOTATION_PARAMETER_WRAP = DO_NOT_WRAP; ALIGN_MULTILINE_PARAMETERS_IN_CALLS = false -->
+    <setting id="org.eclipse.jdt.core.formatter.alignment_for_arguments_in_allocation_expression" value="0"/>
+    <!-- CALL_PARAMETERS_WRAP / ANNOTATION_PARAMETER_WRAP = DO_NOT_WRAP; ALIGN_MULTILINE_PARAMETERS_IN_CALLS = false -->
+    <setting id="org.eclipse.jdt.core.formatter.alignment_for_arguments_in_explicit_constructor_call" value="0"/>
+    <!-- CALL_PARAMETERS_WRAP / ANNOTATION_PARAMETER_WRAP = DO_NOT_WRAP; ALIGN_MULTILINE_PARAMETERS_IN_CALLS = false -->
+    <setting id="org.eclipse.jdt.core.formatter.alignment_for_arguments_in_enum_constant" value="0"/>
+    <!-- CALL_PARAMETERS_WRAP / ANNOTATION_PARAMETER_WRAP = DO_NOT_WRAP; ALIGN_MULTILINE_PARAMETERS_IN_CALLS = false -->
+    <setting id="org.eclipse.jdt.core.formatter.alignment_for_arguments_in_annotation" value="0"/>
+    <!-- METHOD_CALL_CHAIN_WRAP = DO_NOT_WRAP -->
+    <setting id="org.eclipse.jdt.core.formatter.alignment_for_selector_in_method_invocation" value="0"/>
+    <!-- ARRAY_INITIALIZER_WRAP = DO_NOT_WRAP -->
+    <setting id="org.eclipse.jdt.core.formatter.alignment_for_expressions_in_array_initializer" value="0"/>
+    <!-- ASSIGNMENT_WRAP = DO_NOT_WRAP -->
+    <setting id="org.eclipse.jdt.core.formatter.alignment_for_assignment" value="0"/>
+    <!-- TERNARY_OPERATION_WRAP = DO_NOT_WRAP -->
+    <setting id="org.eclipse.jdt.core.formatter.alignment_for_conditional_expression" value="0"/>
+    <!-- EXTENDS_LIST_WRAP = DO_NOT_WRAP -->
+    <setting id="org.eclipse.jdt.core.formatter.alignment_for_superclass_in_type_declaration" value="0"/>
+    <!-- EXTENDS_LIST_WRAP = DO_NOT_WRAP -->
+    <setting id="org.eclipse.jdt.core.formatter.alignment_for_superinterfaces_in_type_declaration" value="0"/>
+    <!-- THROWS_LIST_WRAP = DO_NOT_WRAP -->
+    <setting id="org.eclipse.jdt.core.formatter.alignment_for_throws_clause_in_method_declaration" value="0"/>
+    <!-- THROWS_LIST_WRAP = DO_NOT_WRAP -->
+    <setting id="org.eclipse.jdt.core.formatter.alignment_for_throws_clause_in_constructor_declaration" value="0"/>
+    <!-- RESOURCE_LIST_WRAP = DO_NOT_WRAP -->
+    <setting id="org.eclipse.jdt.core.formatter.alignment_for_resources_in_try" value="0"/>
+    <!-- BINARY_OPERATION_WRAP = DO_NOT_WRAP -->
+    <setting id="org.eclipse.jdt.core.formatter.alignment_for_multiplicative_operator" value="0"/>
+    <!-- BINARY_OPERATION_WRAP = DO_NOT_WRAP -->
+    <setting id="org.eclipse.jdt.core.formatter.alignment_for_additive_operator" value="0"/>
+    <!-- BINARY_OPERATION_WRAP = DO_NOT_WRAP -->
+    <setting id="org.eclipse.jdt.core.formatter.alignment_for_string_concatenation" value="0"/>
+    <!-- BINARY_OPERATION_WRAP = DO_NOT_WRAP -->
+    <setting id="org.eclipse.jdt.core.formatter.alignment_for_shift_operator" value="0"/>
+    <!-- BINARY_OPERATION_WRAP = DO_NOT_WRAP -->
+    <setting id="org.eclipse.jdt.core.formatter.alignment_for_relational_operator" value="0"/>
+    <!-- BINARY_OPERATION_WRAP = DO_NOT_WRAP -->
+    <setting id="org.eclipse.jdt.core.formatter.alignment_for_bitwise_operator" value="0"/>
+    <!-- BINARY_OPERATION_WRAP = DO_NOT_WRAP -->
+    <setting id="org.eclipse.jdt.core.formatter.alignment_for_logical_operator" value="0"/>
+    <!-- CLASS_BRACE_STYLE / METHOD_BRACE_STYLE / LAMBDA_BRACE_STYLE / BRACE_STYLE = END_OF_LINE; ARRAY_INITIALIZER_LBRACE_ON_NEXT_LINE = false -->
+    <setting id="org.eclipse.jdt.core.formatter.brace_position_for_type_declaration" value="end_of_line"/>
+    <!-- CLASS_BRACE_STYLE / METHOD_BRACE_STYLE / LAMBDA_BRACE_STYLE / BRACE_STYLE = END_OF_LINE; ARRAY_INITIALIZER_LBRACE_ON_NEXT_LINE = false -->
+    <setting id="org.eclipse.jdt.core.formatter.brace_position_for_method_declaration" value="end_of_line"/>
+    <!-- CLASS_BRACE_STYLE / METHOD_BRACE_STYLE / LAMBDA_BRACE_STYLE / BRACE_STYLE = END_OF_LINE; ARRAY_INITIALIZER_LBRACE_ON_NEXT_LINE = false -->
+    <setting id="org.eclipse.jdt.core.formatter.brace_position_for_constructor_declaration" value="end_of_line"/>
+    <!-- CLASS_BRACE_STYLE / METHOD_BRACE_STYLE / LAMBDA_BRACE_STYLE / BRACE_STYLE = END_OF_LINE; ARRAY_INITIALIZER_LBRACE_ON_NEXT_LINE = false -->
+    <setting id="org.eclipse.jdt.core.formatter.brace_position_for_block" value="end_of_line"/>
+    <!-- CLASS_BRACE_STYLE / METHOD_BRACE_STYLE / LAMBDA_BRACE_STYLE / BRACE_STYLE = END_OF_LINE; ARRAY_INITIALIZER_LBRACE_ON_NEXT_LINE = false -->
+    <setting id="org.eclipse.jdt.core.formatter.brace_position_for_block_in_case" value="end_of_line"/>
+    <!-- CLASS_BRACE_STYLE / METHOD_BRACE_STYLE / LAMBDA_BRACE_STYLE / BRACE_STYLE = END_OF_LINE; ARRAY_INITIALIZER_LBRACE_ON_NEXT_LINE = false -->
+    <setting id="org.eclipse.jdt.core.formatter.brace_position_for_switch" value="end_of_line"/>
+    <!-- CLASS_BRACE_STYLE / METHOD_BRACE_STYLE / LAMBDA_BRACE_STYLE / BRACE_STYLE = END_OF_LINE; ARRAY_INITIALIZER_LBRACE_ON_NEXT_LINE = false -->
+    <setting id="org.eclipse.jdt.core.formatter.brace_position_for_anonymous_type_declaration" value="end_of_line"/>
+    <!-- CLASS_BRACE_STYLE / METHOD_BRACE_STYLE / LAMBDA_BRACE_STYLE / BRACE_STYLE = END_OF_LINE; ARRAY_INITIALIZER_LBRACE_ON_NEXT_LINE = false -->
+    <setting id="org.eclipse.jdt.core.formatter.brace_position_for_enum_declaration" value="end_of_line"/>
+    <!-- CLASS_BRACE_STYLE / METHOD_BRACE_STYLE / LAMBDA_BRACE_STYLE / BRACE_STYLE = END_OF_LINE; ARRAY_INITIALIZER_LBRACE_ON_NEXT_LINE = false -->
+    <setting id="org.eclipse.jdt.core.formatter.brace_position_for_enum_constant" value="end_of_line"/>
+    <!-- CLASS_BRACE_STYLE / METHOD_BRACE_STYLE / LAMBDA_BRACE_STYLE / BRACE_STYLE = END_OF_LINE; ARRAY_INITIALIZER_LBRACE_ON_NEXT_LINE = false -->
+    <setting id="org.eclipse.jdt.core.formatter.brace_position_for_annotation_type_declaration" value="end_of_line"/>
+    <!-- CLASS_BRACE_STYLE / METHOD_BRACE_STYLE / LAMBDA_BRACE_STYLE / BRACE_STYLE = END_OF_LINE; ARRAY_INITIALIZER_LBRACE_ON_NEXT_LINE = false -->
+    <setting id="org.eclipse.jdt.core.formatter.brace_position_for_lambda_body" value="end_of_line"/>
+    <!-- CLASS_BRACE_STYLE / METHOD_BRACE_STYLE / LAMBDA_BRACE_STYLE / BRACE_STYLE = END_OF_LINE; ARRAY_INITIALIZER_LBRACE_ON_NEXT_LINE = false -->
+    <setting id="org.eclipse.jdt.core.formatter.brace_position_for_array_initializer" value="end_of_line"/>
+    <!-- ELSE_ON_NEW_LINE / CATCH_ON_NEW_LINE / FINALLY_ON_NEW_LINE / WHILE_ON_NEW_LINE = false -->
+    <setting id="org.eclipse.jdt.core.formatter.insert_new_line_before_else_in_if_statement" value="do not insert"/>
+    <!-- ELSE_ON_NEW_LINE / CATCH_ON_NEW_LINE / FINALLY_ON_NEW_LINE / WHILE_ON_NEW_LINE = false -->
+    <setting id="org.eclipse.jdt.core.formatter.insert_new_line_before_catch_in_try_statement" value="do not insert"/>
+    <!-- ELSE_ON_NEW_LINE / CATCH_ON_NEW_LINE / FINALLY_ON_NEW_LINE / WHILE_ON_NEW_LINE = false -->
+    <setting id="org.eclipse.jdt.core.formatter.insert_new_line_before_finally_in_try_statement" value="do not insert"/>
+    <!-- ELSE_ON_NEW_LINE / CATCH_ON_NEW_LINE / FINALLY_ON_NEW_LINE / WHILE_ON_NEW_LINE = false -->
+    <setting id="org.eclipse.jdt.core.formatter.insert_new_line_before_while_in_do_statement" value="do not insert"/>
+    <!-- CLASS / METHOD / FIELD_ANNOTATION_WRAP = WRAP_ALWAYS; DO_NOT_WRAP_AFTER_SINGLE_ANNOTATION = false -->
+    <setting id="org.eclipse.jdt.core.formatter.insert_new_line_after_annotation_on_type" value="insert"/>
+    <!-- CLASS / METHOD / FIELD_ANNOTATION_WRAP = WRAP_ALWAYS; DO_NOT_WRAP_AFTER_SINGLE_ANNOTATION = false -->
+    <setting id="org.eclipse.jdt.core.formatter.insert_new_line_after_annotation_on_method" value="insert"/>
+    <!-- CLASS / METHOD / FIELD_ANNOTATION_WRAP = WRAP_ALWAYS; DO_NOT_WRAP_AFTER_SINGLE_ANNOTATION = false -->
+    <setting id="org.eclipse.jdt.core.formatter.insert_new_line_after_annotation_on_field" value="insert"/>
+    <!-- PARAMETER / VARIABLE / ENUM_FIELD_ANNOTATION_WRAP = DO_NOT_WRAP -->
+    <setting id="org.eclipse.jdt.core.formatter.insert_new_line_after_annotation_on_parameter" value="do not insert"/>
+    <!-- PARAMETER / VARIABLE / ENUM_FIELD_ANNOTATION_WRAP = DO_NOT_WRAP -->
+    <setting id="org.eclipse.jdt.core.formatter.insert_new_line_after_annotation_on_local_variable" value="do not insert"/>
+    <!-- PARAMETER / VARIABLE / ENUM_FIELD_ANNOTATION_WRAP = DO_NOT_WRAP -->
+    <setting id="org.eclipse.jdt.core.formatter.insert_new_line_after_annotation_on_enum_constant" value="do not insert"/>
+    <!-- BLANK_LINES_BEFORE_PACKAGE = 0 (minimum) -->
+    <setting id="org.eclipse.jdt.core.formatter.blank_lines_before_package" value="0"/>
+    <!-- BLANK_LINES_AFTER_PACKAGE = 1 (minimum) -->
+    <setting id="org.eclipse.jdt.core.formatter.blank_lines_after_package" value="1"/>
+    <!-- BLANK_LINES_BEFORE_IMPORTS = 1 (minimum) -->
+    <setting id="org.eclipse.jdt.core.formatter.blank_lines_before_imports" value="1"/>
+    <!-- BLANK_LINES_AFTER_IMPORTS = 1 (minimum) -->
+    <setting id="org.eclipse.jdt.core.formatter.blank_lines_after_imports" value="1"/>
+    <!-- BLANK_LINES_AROUND_FIELD / BLANK_LINES_AROUND_FIELD_IN_INTERFACE = 0 (minimum) -->
+    <setting id="org.eclipse.jdt.core.formatter.blank_lines_before_field" value="0"/>
+    <!-- BLANK_LINES_AROUND_METHOD = 1 (minimum) -->
+    <setting id="org.eclipse.jdt.core.formatter.blank_lines_before_method" value="1"/>
+    <!-- BLANK_LINES_AROUND_METHOD_IN_INTERFACE = 1 (minimum) -->
+    <setting id="org.eclipse.jdt.core.formatter.blank_lines_before_abstract_method" value="1"/>
+    <!-- BLANK_LINES_AROUND_CLASS = 1 (minimum) -->
+    <setting id="org.eclipse.jdt.core.formatter.blank_lines_before_member_type" value="1"/>
+    <!-- BLANK_LINES_AFTER_CLASS_HEADER = 0 (minimum) -->
+    <setting id="org.eclipse.jdt.core.formatter.blank_lines_before_first_class_body_declaration" value="0"/>
+    <!-- BLANK_LINES_BEFORE_CLASS_END = 0 (minimum) -->
+    <setting id="org.eclipse.jdt.core.formatter.blank_lines_after_last_class_body_declaration" value="0"/>
+    <!-- BLANK_LINES_AROUND_METHOD / AROUND_CLASS = 1; JDT chunks separate member kinds, not consecutive fields -->
+    <setting id="org.eclipse.jdt.core.formatter.blank_lines_before_new_chunk" value="1"/>
+    <!-- DO_NOT_INDENT_TOP_LEVEL_CLASS_MEMBERS = false -->
+    <setting id="org.eclipse.jdt.core.formatter.indent_body_declarations_compare_to_type_header" value="true"/>
+    <!-- DO_NOT_INDENT_TOP_LEVEL_CLASS_MEMBERS = false -->
+    <setting id="org.eclipse.jdt.core.formatter.indent_body_declarations_compare_to_enum_declaration_header" value="true"/>
+    <!-- DO_NOT_INDENT_TOP_LEVEL_CLASS_MEMBERS = false -->
+    <setting id="org.eclipse.jdt.core.formatter.indent_body_declarations_compare_to_enum_constant_header" value="true"/>
+    <!-- DO_NOT_INDENT_TOP_LEVEL_CLASS_MEMBERS = false -->
+    <setting id="org.eclipse.jdt.core.formatter.indent_body_declarations_compare_to_annotation_declaration_header" value="true"/>
+    <!-- INDENT_CASE_FROM_SWITCH = true -->
+    <setting id="org.eclipse.jdt.core.formatter.indent_switchstatements_compare_to_switch" value="true"/>
+    <!-- INDENT_BREAK_FROM_CASE = true -->
+    <setting id="org.eclipse.jdt.core.formatter.indent_switchstatements_compare_to_cases" value="true"/>
+    <!-- KEEP_SIMPLE_BLOCKS / METHODS / LAMBDAS / CLASSES_IN_ONE_LINE = false -->
+    <setting id="org.eclipse.jdt.core.formatter.keep_code_block_on_one_line" value="one_line_never"/>
+    <!-- KEEP_SIMPLE_BLOCKS / METHODS / LAMBDAS / CLASSES_IN_ONE_LINE = false -->
+    <setting id="org.eclipse.jdt.core.formatter.keep_method_body_on_one_line" value="one_line_never"/>
+    <!-- KEEP_SIMPLE_BLOCKS / METHODS / LAMBDAS / CLASSES_IN_ONE_LINE = false -->
+    <setting id="org.eclipse.jdt.core.formatter.keep_lambda_body_block_on_one_line" value="one_line_never"/>
+    <!-- KEEP_SIMPLE_BLOCKS / METHODS / LAMBDAS / CLASSES_IN_ONE_LINE = false -->
+    <setting id="org.eclipse.jdt.core.formatter.keep_type_declaration_on_one_line" value="one_line_never"/>
+    <!-- KEEP_SIMPLE_BLOCKS / METHODS / LAMBDAS / CLASSES_IN_ONE_LINE = false -->
+    <setting id="org.eclipse.jdt.core.formatter.keep_anonymous_type_declaration_on_one_line" value="one_line_never"/>
+    <!-- KEEP_SIMPLE_BLOCKS / METHODS / LAMBDAS / CLASSES_IN_ONE_LINE = false -->
+    <setting id="org.eclipse.jdt.core.formatter.keep_enum_declaration_on_one_line" value="one_line_never"/>
+    <!-- KEEP_SIMPLE_BLOCKS / METHODS / LAMBDAS / CLASSES_IN_ONE_LINE = false -->
+    <setting id="org.eclipse.jdt.core.formatter.keep_annotation_declaration_on_one_line" value="one_line_never"/>
+    <!-- KEEP_SIMPLE_BLOCKS / METHODS / LAMBDAS / CLASSES_IN_ONE_LINE = false -->
+    <setting id="org.eclipse.jdt.core.formatter.keep_if_then_body_block_on_one_line" value="one_line_never"/>
+    <!-- KEEP_SIMPLE_BLOCKS / METHODS / LAMBDAS / CLASSES_IN_ONE_LINE = false -->
+    <setting id="org.eclipse.jdt.core.formatter.keep_loop_body_block_on_one_line" value="one_line_never"/>
+    <!-- KEEP_SIMPLE_BLOCKS / METHODS / CLASSES_IN_ONE_LINE = false; empty-block handling may differ in JDT -->
+    <setting id="org.eclipse.jdt.core.formatter.insert_new_line_in_empty_type_declaration" value="insert"/>
+    <!-- KEEP_SIMPLE_BLOCKS / METHODS / CLASSES_IN_ONE_LINE = false; empty-block handling may differ in JDT -->
+    <setting id="org.eclipse.jdt.core.formatter.insert_new_line_in_empty_method_body" value="insert"/>
+    <!-- KEEP_SIMPLE_BLOCKS / METHODS / CLASSES_IN_ONE_LINE = false; empty-block handling may differ in JDT -->
+    <setting id="org.eclipse.jdt.core.formatter.insert_new_line_in_empty_block" value="insert"/>
+    <!-- KEEP_SIMPLE_BLOCKS / METHODS / CLASSES_IN_ONE_LINE = false; empty-block handling may differ in JDT -->
+    <setting id="org.eclipse.jdt.core.formatter.insert_new_line_in_empty_anonymous_type_declaration" value="insert"/>
+    <!-- ARRAY_INITIALIZER_LBRACE_ON_NEXT_LINE / RBRACE_ON_NEXT_LINE = false -->
+    <setting id="org.eclipse.jdt.core.formatter.keep_empty_array_initializer_on_one_line" value="true"/>
+    <!-- ARRAY_INITIALIZER_LBRACE_ON_NEXT_LINE = false; KEEP_LINE_BREAKS = true -->
+    <setting id="org.eclipse.jdt.core.formatter.insert_new_line_after_opening_brace_in_array_initializer" value="do not insert"/>
+    <!-- ARRAY_INITIALIZER_RBRACE_ON_NEXT_LINE = false; KEEP_LINE_BREAKS = true -->
+    <setting id="org.eclipse.jdt.core.formatter.insert_new_line_before_closing_brace_in_array_initializer" value="do not insert"/>
+    <!-- SPACE_BEFORE_ARRAY_INITIALIZER_LBRACE / SPACE_WITHIN_ARRAY_INITIALIZER_BRACES / SPACE_WITHIN_EMPTY_ARRAY_INITIALIZER_BRACES = false -->
+    <setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_array_initializer" value="do not insert"/>
+    <!-- SPACE_BEFORE_ARRAY_INITIALIZER_LBRACE / SPACE_WITHIN_ARRAY_INITIALIZER_BRACES / SPACE_WITHIN_EMPTY_ARRAY_INITIALIZER_BRACES = false -->
+    <setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_brace_in_array_initializer" value="do not insert"/>
+    <!-- SPACE_BEFORE_ARRAY_INITIALIZER_LBRACE / SPACE_WITHIN_ARRAY_INITIALIZER_BRACES / SPACE_WITHIN_EMPTY_ARRAY_INITIALIZER_BRACES = false -->
+    <setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_brace_in_array_initializer" value="do not insert"/>
+    <!-- SPACE_BEFORE_ARRAY_INITIALIZER_LBRACE / SPACE_WITHIN_ARRAY_INITIALIZER_BRACES / SPACE_WITHIN_EMPTY_ARRAY_INITIALIZER_BRACES = false -->
+    <setting id="org.eclipse.jdt.core.formatter.insert_space_between_empty_braces_in_array_initializer" value="do not insert"/>
+    <!-- SPACE_AROUND_LAMBDA_ARROW = true -->
+    <setting id="org.eclipse.jdt.core.formatter.insert_space_before_lambda_arrow" value="insert"/>
+    <!-- SPACE_AROUND_LAMBDA_ARROW = true -->
+    <setting id="org.eclipse.jdt.core.formatter.insert_space_after_lambda_arrow" value="insert"/>
+    <!-- WRAP_COMMENTS = false; KEEP_FIRST_COLUMN_COMMENT = true (JDT comment formatting disabled to preserve text) -->
+    <setting id="org.eclipse.jdt.core.formatter.comment.format_line_comments" value="false"/>
+    <!-- WRAP_COMMENTS = false (JDT comment formatting disabled to preserve text) -->
+    <setting id="org.eclipse.jdt.core.formatter.comment.format_block_comments" value="false"/>
+    <!-- JavaCodeStyleSettings.ENABLE_JAVADOC_FORMATTING = true -->
+    <setting id="org.eclipse.jdt.core.formatter.comment.format_javadoc_comments" value="true"/>
+    <!-- WRAP_COMMENTS = false; JDT has a separate comment width, so disable its width-based wrapping -->
+    <setting id="org.eclipse.jdt.core.formatter.comment.line_length" value="999999"/>
+    <!-- JavaCodeStyleSettings.JD_INDENT_ON_CONTINUATION = false -->
+    <setting id="org.eclipse.jdt.core.formatter.comment.indent_parameter_description" value="false"/>
+    <!-- JavaCodeStyleSettings.JD_PARAM_DESCRIPTION_ON_NEW_LINE = false -->
+    <setting id="org.eclipse.jdt.core.formatter.comment.insert_new_line_for_parameter" value="false"/>
+    <!-- CodeStyleSettings.FORMATTER_TAGS_ENABLED = true -->
+    <setting id="org.eclipse.jdt.core.formatter.use_on_off_tags" value="true"/>
+    <!-- KEEP_CONTROL_STATEMENT_IN_ONE_LINE = true -->
+    <setting id="org.eclipse.jdt.core.formatter.keep_then_statement_on_same_line" value="true"/>
+    <!-- KEEP_CONTROL_STATEMENT_IN_ONE_LINE = true -->
+    <setting id="org.eclipse.jdt.core.formatter.keep_else_statement_on_same_line" value="true"/>
+    <!-- KEEP_CONTROL_STATEMENT_IN_ONE_LINE = true -->
+    <setting id="org.eclipse.jdt.core.formatter.keep_imple_if_on_one_line" value="true"/>
+    <!-- KEEP_CONTROL_STATEMENT_IN_ONE_LINE = true -->
+    <setting id="org.eclipse.jdt.core.formatter.keep_simple_for_body_on_same_line" value="true"/>
+    <!-- KEEP_CONTROL_STATEMENT_IN_ONE_LINE = true -->
+    <setting id="org.eclipse.jdt.core.formatter.keep_simple_while_body_on_same_line" value="true"/>
+    <!-- KEEP_CONTROL_STATEMENT_IN_ONE_LINE = true -->
+    <setting id="org.eclipse.jdt.core.formatter.keep_simple_do_while_body_on_same_line" value="true"/>
+  </profile>
+</profiles>

crates/ide-lsp/tests/mock_server.rs

@@ -1017,6 +1017,70 @@ async fn settings_changes_reach_servers_without_restarts() {
     assert_eq!(s.launches.load(Ordering::SeqCst), 1);
 }
 
+#[tokio::test(flavor = "multi_thread")]
+async fn java_formatter_profiles_reach_initialization_and_live_configuration_without_restart() {
+    let h = harness_configured("java", "java", &[("jdtls", incremental_caps())], |cfg| {
+        cfg.initialization_options = Some(
+            toml::Value::try_from(json!({
+                "settings": {"java": {"autobuild": {"enabled": false}}}
+            }))
+            .unwrap(),
+        );
+    });
+    let data = tempfile::tempdir().unwrap();
+    std::fs::write(h.root.join("custom.xml"), "<profiles/>").unwrap();
+    let style = Arc::new(Mutex::new(ide_core::editor_settings::LanguageCodeStyle {
+        formatter: Some("intellij".into()),
+        formatter_path: Some("custom.xml".into()),
+        ..Default::default()
+    }));
+    h.mgr.set_config_hook(Box::new({
+        let style = style.clone();
+        let root = h.root.clone();
+        let data = data.path().to_path_buf();
+        move |cfg, _| ide_lsp::jdtls::configure_formatter(cfg, Some(&style.lock()), &root, &data, None).unwrap()
+    }));
+    h.open("Main.java", "public class Main {}");
+    h.wait_status("jdtls", ServerStatus::Ready).await;
+    let state = h.launcher.state("jdtls");
+    let init = state.requested("initialize")[0].clone();
+    assert_eq!(
+        init["initializationOptions"]["settings"]["java"]["format"]["settings"]["profile"],
+        "OpenIDEA IntelliJ IDEA"
+    );
+    for mode in ["custom", "default", "intellij", "default"] {
+        style.lock().formatter = Some(mode.into());
+        h.mgr.reconfigure().await;
+        let expected = match mode {
+            "custom" => uri_of(&h.root.join("custom.xml")),
+            "intellij" => uri_of(&data.path().join("lsp/jdtls/intellij.xml")),
+            _ => String::new(),
+        };
+        eventually(|| {
+            state
+                .notified("workspace/didChangeConfiguration")
+                .last()
+                .is_some_and(|p| p["settings"]["java"]["format"]["settings"]["url"] == expected)
+        })
+        .await;
+        let result: Value = state
+            .peer()
+            .request(
+                "workspace/configuration",
+                json!({
+                    "items": [{"section": "java.format.settings"}, {"section": "java.autobuild.enabled"}]
+                }),
+                None,
+            )
+            .await
+            .unwrap();
+        assert_eq!(result[0]["url"], expected);
+        assert_eq!(result[0]["profile"], if mode == "intellij" { "OpenIDEA IntelliJ IDEA" } else { "" });
+        assert_eq!(result[1], false);
+        assert_eq!(state.launches.load(Ordering::SeqCst), 1);
+    }
+}
+
 #[tokio::test(flavor = "multi_thread")]
 async fn java_source_paths_reach_initialization_live_configuration_and_builds() {
     let h = harness_configured("java", "java", &[("jdtls", incremental_caps())], |cfg| {

src/bindings.ts

@@ -3903,6 +3903,10 @@ export type LanguageCodeStyle = LanguageCodeStyle_Serialize | LanguageCodeStyle_
 
 /**  Editor › Code Style › <Language> › Tabs and Indents (unset fields inherit). */
 export type LanguageCodeStyle_Deserialize = {
+	/**  Java formatter: `default` | `intellij` | `custom` (other languages ignore it). */
+	formatter?: string | null,
+	/**  Eclipse formatter XML; relative paths start at the project root. */
+	formatterPath?: string | null,
 	useTab?: boolean | null,
 	tabSize?: number | null,
 	indent?: number | null,
@@ -3915,6 +3919,10 @@ export type LanguageCodeStyle_Deserialize = {
 
 /**  Editor › Code Style › <Language> › Tabs and Indents (unset fields inherit). */
 export type LanguageCodeStyle_Serialize = {
+	/**  Java formatter: `default` | `intellij` | `custom` (other languages ignore it). */
+	formatter?: string | null,
+	/**  Eclipse formatter XML; relative paths start at the project root. */
+	formatterPath?: string | null,
 	useTab?: boolean | null,
 	tabSize?: number | null,
 	indent?: number | null,

src/features/settings/__tests__/fileTypes.test.ts

@@ -87,6 +87,9 @@ describe("code style scheme", () => {
   it("copies every Code Style value to the other scheme", () => {
     stage("editor.codeStyle", "global", "editor.codeStyle.hardWrapAt", 100);
     stage("editor.codeStyle", "global", "editor.codeStyle.formatterTagsEnabled", true);
+    stage("editor.codeStyle", "global", "editor.codeStyle.languages", {
+      java: { formatter: "custom", formatterPath: "config/formatter.xml" },
+    });
     copyScheme("editor.codeStyle", "global", "project");
     const s = useSettingsDialog.getState();
     expect(stagedValue(s, "project", "editor.codeStyle.hardWrapAt")).toBe(100);

src/features/settings/__tests__/javaFormatter.test.tsx

@@ -0,0 +1,68 @@
+import { act, cleanup, fireEvent, render, screen } from "@testing-library/react";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { useProject } from "@/platform/project";
+import { PageContext } from "../components/context";
+import { DEFAULT_SETTINGS } from "../model/schema";
+import { openSettings, stagedValue, useSettingsDialog } from "../model/staging";
+import { codeStyleLanguagePages } from "../pages/editor/codeStyle";
+
+const mocks = vi.hoisted(() => ({ open: vi.fn() }));
+vi.mock("@tauri-apps/plugin-dialog", () => ({ open: mocks.open }));
+vi.mock("@/platform/ipc", async (original) => {
+  const actual = await original<typeof import("@/platform/ipc")>();
+  return {
+    ...actual,
+    isTauri: () => true,
+    commands: {
+      ...actual.commands,
+      languages: async () => [
+        { id: "java", name: "Java", indent: { tabSize: 4, insertSpaces: true } },
+        { id: "rust", name: "Rust" },
+      ],
+    },
+  };
+});
+
+beforeEach(() => {
+  useProject.setState({ settings: structuredClone(DEFAULT_SETTINGS), project: null });
+  openSettings("editor.codeStyle.java");
+});
+afterEach(cleanup);
+
+async function page(language: string) {
+  const pages = await codeStyleLanguagePages();
+  const spec = pages.find((p) => p.id === `editor.codeStyle.${language}`)!;
+  const Page = spec.component!;
+  render(
+    <PageContext.Provider value={{ pageId: spec.id, scope: "global" }}>
+      <Page />
+    </PageContext.Provider>,
+  );
+}
+const value = () => stagedValue(useSettingsDialog.getState(), "global", "editor.codeStyle.languages");
+
+describe("Java formatting profile", () => {
+  it("stages profile and relative XML paths, browses for XML, and resets language defaults", async () => {
+    await page("java");
+    fireEvent.click(screen.getByRole("button", { name: "Formatting profile" }));
+    fireEvent.click(screen.getByRole("option", { name: "Custom Eclipse formatter XML" }));
+    fireEvent.change(screen.getByLabelText("Eclipse formatter XML"), { target: { value: "config/style.xml" } });
+    expect(value()).toEqual({ java: { formatter: "custom", formatterPath: "config/style.xml" } });
+    mocks.open.mockResolvedValue("/project/custom.xml");
+    await act(async () => fireEvent.click(screen.getByRole("button", { name: "Browse…" })));
+    expect(value()).toEqual({ java: { formatter: "custom", formatterPath: "/project/custom.xml" } });
+    expect(mocks.open).toHaveBeenCalledWith(
+      expect.objectContaining({ filters: [{ name: "XML", extensions: ["xml"] }] }),
+    );
+    fireEvent.click(screen.getByRole("button", { name: "Formatting profile" }));
+    fireEvent.click(screen.getByRole("option", { name: "IntelliJ IDEA" }));
+    expect(screen.queryByLabelText("Eclipse formatter XML")).toBeNull();
+    fireEvent.click(screen.getByRole("button", { name: "Reset to Language Defaults" }));
+    expect(value()).toEqual({});
+  });
+
+  it("keeps the profile controls specific to Java", async () => {
+    await page("rust");
+    expect(screen.queryByRole("button", { name: "Formatting profile" })).toBeNull();
+  });
+});

src/features/settings/pages/editor/codeStyle.tsx

@@ -12,7 +12,7 @@ import { Button, Checkbox, Input, type SelectOption, T } from "@/ui";
 import { commands, isTauri, type LanguageInfo_Serialize as LanguageInfo } from "@/platform/ipc";
 import { ENCODING_CHOICES, lineCommentDefaults, type LanguageCodeStyle } from "@/platform/editorSettings";
 import { NATIVE_TO_ASCII_ACTION } from "../../nativeToAscii";
-import { NumberInput, Row } from "../../components/Form";
+import { NumberInput, Row, Select } from "../../components/Form";
 import { useSetting } from "../../components/context";
 import type { PageSpec } from "../spec";
 import { CODE_STYLE_SCOPE, CodeStyleMain, SchemeRow, formatterLabels } from "./codeStyleScheme";
@@ -159,6 +159,7 @@ function LanguageStyle({ lang }: { lang: LanguageInfo }) {
   return (
     <div className={styles.page}>
       <SchemeRow />
+      {lang.id === "java" && <JavaFormatter style={own} onChange={set} />}
       <section aria-label={tx("Tabs and Indents")}>
         <div className={styles.previewTitle}>
           <T>Tabs and Indents</T>
@@ -238,6 +239,62 @@ function LanguageStyle({ lang }: { lang: LanguageInfo }) {
   );
 }
 
+const JAVA_FORMATTERS: SelectOption<NonNullable<LanguageCodeStyle["formatter"]>>[] = [
+  { value: "default", label: "Default" },
+  { value: "intellij", label: "IntelliJ IDEA" },
+  { value: "custom", label: "Custom Eclipse formatter XML" },
+];
+
+function JavaFormatter({
+  style,
+  onChange,
+}: {
+  style: LanguageCodeStyle;
+  onChange: (patch: Partial<LanguageCodeStyle>) => void;
+}) {
+  const id = useId();
+  const browse = async () => {
+    const { open } = await import("@tauri-apps/plugin-dialog");
+    const path = await open({
+      multiple: false,
+      title: tx("Eclipse formatter XML"),
+      filters: [{ name: "XML", extensions: ["xml"] }],
+    });
+    if (typeof path === "string") onChange({ formatterPath: path });
+  };
+  return (
+    <section aria-label={tx("Formatting profile")}>
+      <Row
+        label="Formatting profile"
+        hint="Changes take effect after Apply without restarting the Java language server."
+      >
+        <Select
+          value={style.formatter ?? "default"}
+          options={JAVA_FORMATTERS}
+          onChange={(formatter) => onChange({ formatter })}
+          aria-label="Formatting profile"
+        />
+      </Row>
+      {style.formatter === "custom" && (
+        <Row
+          label="Eclipse formatter XML"
+          htmlFor={id}
+          hint="Absolute or project-relative path. To reload an edited XML file, switch to Default, apply, then select Custom again."
+        >
+          <Input
+            id={id}
+            value={style.formatterPath ?? ""}
+            onChange={(e) => onChange({ formatterPath: e.target.value })}
+          />
+          <Button size="small" onClick={browse}>
+            <T>Browse…</T>
+          </Button>
+        </Row>
+      )}
+    </section>
+  );
+}
+
 const SKIP = new Set(["plaintext", "log", "diff", "ignore", "gitattributes"]);
 
 /** One Code Style page per language (registered once the language list is known). */
@@ -261,6 +318,9 @@ export async function codeStyleLanguagePages(): Promise<PageSpec[]> {
         "Hard wrap at",
         "Comment Code",
         "Line comment at first column",
+        ...(lang.id === "java"
+          ? ["Formatting profile", "IntelliJ IDEA", "Custom Eclipse formatter XML", "Eclipse formatter XML"]
+          : []),
       ],
       component: () => <LanguageStyle lang={lang} />,
     }));

src/platform/editorSettings.ts

@@ -24,6 +24,9 @@ export interface CustomColorScheme {
 export type CustomColorSchemes = Record<string, CustomColorScheme>;
 
 export interface LanguageCodeStyle {
+  /** Java formatter; relative XML paths start at the project root. */
+  formatter?: "default" | "intellij" | "custom";
+  formatterPath?: string;
   useTab?: boolean;
   tabSize?: number;
   indent?: number;

src/platform/locales/text/zh.json

@@ -5440,5 +5440,15 @@
   "copy paths must belong to the comparison roots": "复制路径必须位于比较的根目录内",
   "cannot copy overlapping paths": "无法在相互包含的路径之间复制",
   "cannot copy through a destination symlink": "无法通过目标目录内的符号链接复制",
-  "expected a relative comparison entry path": "需要比较条目的相对路径"
+  "expected a relative comparison entry path": "需要比较条目的相对路径",
+  "IntelliJ IDEA": "IntelliJ IDEA",
+  "Formatting profile": "格式化方案",
+  "Custom Eclipse formatter XML": "自定义 Eclipse 格式化 XML",
+  "Eclipse formatter XML": "Eclipse 格式化 XML",
+  "Changes take effect after Apply without restarting the Java language server.": "应用后即生效，无需重启 Java 语言服务器。",
+  "Absolute or project-relative path. To reload an edited XML file, switch to Default, apply, then select Custom again.": "使用绝对路径或项目相对路径。修改 XML 文件后，请切换到默认方案并应用，再重新选择自定义方案。",
+  "Cannot read Java formatter XML {path}: {error}": "无法读取 Java 格式化 XML {path}：{error}",
+  "Java formatter configuration unavailable": "Java 格式化配置不可用",
+  "Choose an Eclipse formatter XML file.": "请选择 Eclipse 格式化 XML 文件。",
+  "Not a formatter XML file: {path}": "不是格式化 XML 文件：{path}"
 }