diff --git a/packages/opencode/src/lsp/server.ts b/packages/opencode/src/lsp/server.ts
index ad90ef5c786b..ee0fd67e4f56 100644
--- a/packages/opencode/src/lsp/server.ts
+++ b/packages/opencode/src/lsp/server.ts
@@ -55,6 +55,30 @@ const NearestRoot = (includePatterns: string[], excludePatterns?: string[]): Roo
   }
 }
 
+const StrictNearestRoot = (includePatterns: string[], excludePatterns?: string[]): RootFunction => {
+  return async (file, ctx) => {
+    if (excludePatterns) {
+      const excludedFiles = Filesystem.up({
+        targets: excludePatterns,
+        start: path.dirname(file),
+        stop: ctx.directory,
+      })
+      const excluded = await excludedFiles.next()
+      await excludedFiles.return()
+      if (excluded.value) return undefined
+    }
+    const files = Filesystem.up({
+      targets: includePatterns,
+      start: path.dirname(file),
+      stop: ctx.directory,
+    })
+    const first = await files.next()
+    await files.return()
+    if (!first.value) return undefined
+    return path.dirname(first.value)
+  }
+}
+
 export interface Info {
   id: string
   extensions: string[]
@@ -1173,31 +1197,63 @@ export const Astro: Info = {
   },
 }
 
+function isModuleOf(pomContent: string, modulePath: string): boolean {
+  const normalized = modulePath.replace(/\\/g, "/").replace(/\/$/, "")
+  if (!normalized) return false
+  const modulesBlocks = pomContent.match(/<modules>([\s\S]*?)<\/modules>/g) ?? []
+  for (const block of modulesBlocks) {
+    const stripped = block.replace(/<!--[\s\S]*?-->/g, "")
+    for (const m of stripped.matchAll(/<module>\s*([^<]+?)\s*<\/module>/g)) {
+      const decl = m[1].replace(/\\/g, "/").replace(/^\.\//, "").replace(/\/$/, "")
+      if (decl === normalized) return true
+    }
+  }
+  return false
+}
+
 export const JDTLS: Info = {
   id: "jdtls",
   root: async (file, ctx) => {
-    // Without exclusions, NearestRoot defaults to instance directory so we can't
-    // distinguish between a) no project found and b) project found at instance dir.
-    // So we can't choose the root from (potential) monorepo markers first.
-    // Look for potential subproject markers first while excluding potential monorepo markers.
     const settingsMarkers = ["settings.gradle", "settings.gradle.kts"]
     const gradleMarkers = ["gradlew", "gradlew.bat"]
-    const exclusionsForMonorepos = gradleMarkers.concat(settingsMarkers)
-
-    const [projectRoot, wrapperRoot, settingsRoot] = await Promise.all([
-      NearestRoot(["pom.xml", "build.gradle", "build.gradle.kts", ".project", ".classpath"], exclusionsForMonorepos)(
-        file,
-        ctx,
-      ),
-      NearestRoot(gradleMarkers, settingsMarkers)(file, ctx),
-      NearestRoot(settingsMarkers)(file, ctx),
+    // 1. Gradle (unchanged from original logic)
+    const [wrapperRoot, settingsRoot] = await Promise.all([
+      StrictNearestRoot(gradleMarkers, settingsMarkers)(file, ctx),
+      StrictNearestRoot(settingsMarkers)(file, ctx),
     ])
-
-    // If projectRoot is undefined we know we are in a monorepo or no project at all.
-    // So can safely fall through to the other roots
-    if (projectRoot) return projectRoot
     if (wrapperRoot) return wrapperRoot
     if (settingsRoot) return settingsRoot
+
+    // 2. Gradle single-project fallback (build.gradle without settings.gradle)
+    const buildRoot = await StrictNearestRoot(["build.gradle", "build.gradle.kts"])(file, ctx)
+    if (buildRoot) return buildRoot
+
+    // 3. Maven: walk up pom.xml chain verifying <module> relationships
+    const pomFiles = await Filesystem.findUp(
+      "pom.xml",
+      path.dirname(file),
+      ctx.directory,
+    )
+    if (pomFiles.length > 0) {
+      let root = path.dirname(pomFiles[0])
+      for (let i = 1; i < pomFiles.length; i++) {
+        const parentDir = path.dirname(pomFiles[i])
+        const rel = path.relative(parentDir, root)
+        const content = await fs.readFile(pomFiles[i], "utf-8").catch(() => null)
+        if (content && isModuleOf(content, rel)) {
+          root = parentDir
+        } else {
+          break
+        }
+      }
+      return root
+    }
+
+    // 4. Eclipse native project fallback
+    const eclipseRoot = await StrictNearestRoot([".project", ".classpath"])(file, ctx)
+    if (eclipseRoot) return eclipseRoot
+
+    return undefined
   },
   extensions: [".java"],
   async spawn(root, _ctx, flags) {
diff --git a/packages/opencode/test/lsp/jdtls-root.test.ts b/packages/opencode/test/lsp/jdtls-root.test.ts
new file mode 100644
index 000000000000..02312c9f54f3
--- /dev/null
+++ b/packages/opencode/test/lsp/jdtls-root.test.ts
@@ -0,0 +1,462 @@
+import { describe, test, expect, afterAll } from "bun:test"
+import path from "path"
+import fs from "fs/promises"
+import os from "os"
+import * as LSPServer from "@/lsp/server"
+import type { InstanceContext } from "@/project/instance-context"
+
+// ---------------------------------------------------------------------------
+// Helpers
+// ---------------------------------------------------------------------------
+
+const tmpBase = path.join(os.tmpdir(), "opencode-jdtls-test")
+
+function makeCtx(directory: string): InstanceContext {
+  return { directory, worktree: "/", project: {} as any }
+}
+
+async function mkdirp(p: string) {
+  await fs.mkdir(p, { recursive: true })
+}
+
+async function touch(p: string) {
+  await mkdirp(path.dirname(p))
+  await fs.writeFile(p, "", "utf-8")
+}
+
+// ---------------------------------------------------------------------------
+// Cleanup
+// ---------------------------------------------------------------------------
+
+afterAll(async () => {
+  await fs.rm(tmpBase, { recursive: true, force: true }).catch(() => {})
+})
+
+// ---------------------------------------------------------------------------
+// Tests
+// ---------------------------------------------------------------------------
+
+describe("JDTLS.root", () => {
+  // -------------------------------------------------------------------------
+  // Maven
+  // -------------------------------------------------------------------------
+  describe("Maven", () => {
+    test("single-module Maven project returns pom.xml directory", async () => {
+      const root = path.join(tmpBase, "single-maven")
+      await mkdirp(root)
+      await touch(path.join(root, "pom.xml"))
+      const srcDir = path.join(root, "src", "main", "java", "com", "example")
+      await mkdirp(srcDir)
+      await touch(path.join(srcDir, "App.java"))
+
+      const file = path.join(srcDir, "App.java")
+      const result = await LSPServer.JDTLS.root(file, makeCtx(root))
+      expect(result).toBe(root)
+    })
+
+    test("multi-module Maven project follows <module> chain to top-level pom.xml", async () => {
+      const root = path.join(tmpBase, "multi-maven")
+      await mkdirp(root)
+      // Parent pom with <module>module-a</module>
+      await Bun.write(path.join(root, "pom.xml"), "<project><modules><module>module-a</module></modules></project>")
+      // Child module with its own pom.xml
+      const childDir = path.join(root, "module-a")
+      await mkdirp(childDir)
+      await touch(path.join(childDir, "pom.xml"))
+      const srcDir = path.join(childDir, "src", "main", "java", "com", "example")
+      await mkdirp(srcDir)
+      await touch(path.join(srcDir, "App.java"))
+
+      const file = path.join(srcDir, "App.java")
+      const result = await LSPServer.JDTLS.root(file, makeCtx(root))
+      // Parent declares module-a as module → root is parent directory
+      expect(result).toBe(root)
+    })
+
+    test("Maven project inside a nested directory (ctx.directory is workspace root)", async () => {
+      // Workspace root = ctx.directory, Maven project in a subdirectory
+      const workspace = path.join(tmpBase, "maven-workspace")
+      await mkdirp(workspace)
+      const projectDir = path.join(workspace, "my-maven-app")
+      await touch(path.join(projectDir, "pom.xml"))
+      const srcDir = path.join(projectDir, "src", "main", "java", "com", "example")
+      await mkdirp(srcDir)
+      await touch(path.join(srcDir, "App.java"))
+
+      const file = path.join(srcDir, "App.java")
+      const result = await LSPServer.JDTLS.root(file, makeCtx(workspace))
+      // findUp finds projectDir's pom.xml (only one), returns projectDir
+      expect(result).toBe(projectDir)
+    })
+
+    test("nested independent Maven project stops at its own pom.xml", async () => {
+      const workspace = path.join(tmpBase, "nested-independent")
+      await mkdirp(workspace)
+      // Parent pom WITHOUT <module>tools/sample</module>
+      await Bun.write(path.join(workspace, "pom.xml"), "<project><modules><module>module-a</module></modules></project>")
+      // Independent project nested inside
+      const projectDir = path.join(workspace, "tools", "sample")
+      await mkdirp(projectDir)
+      await touch(path.join(projectDir, "pom.xml"))
+      const srcDir = path.join(projectDir, "src", "main", "java", "com", "example")
+      await mkdirp(srcDir)
+      await touch(path.join(srcDir, "App.java"))
+
+      const file = path.join(srcDir, "App.java")
+      const result = await LSPServer.JDTLS.root(file, makeCtx(workspace))
+      // workspace/pom.xml does NOT declare tools/sample as module → stop at tools/sample
+      expect(result).toBe(projectDir)
+    })
+
+    test("three-level Maven module chain resolves to top-level", async () => {
+      const root = path.join(tmpBase, "three-level")
+      await mkdirp(root)
+      await Bun.write(path.join(root, "pom.xml"), "<project><modules><module>apps</module></modules></project>")
+      const appsDir = path.join(root, "apps")
+      await mkdirp(appsDir)
+      await Bun.write(path.join(appsDir, "pom.xml"), "<project><modules><module>my-app</module></modules></project>")
+      const appDir = path.join(appsDir, "my-app")
+      await mkdirp(appDir)
+      await touch(path.join(appDir, "pom.xml"))
+      const srcDir = path.join(appDir, "src", "main", "java", "com", "example")
+      await mkdirp(srcDir)
+      await touch(path.join(srcDir, "App.java"))
+
+      const file = path.join(srcDir, "App.java")
+      const result = await LSPServer.JDTLS.root(file, makeCtx(root))
+      expect(result).toBe(root)
+    })
+
+    test("three-level Maven chain stops when <module> link is broken", async () => {
+      const root = path.join(tmpBase, "broken-chain")
+      await mkdirp(root)
+      await Bun.write(path.join(root, "pom.xml"), "<project><modules><module>apps</module></modules></project>")
+      const appsDir = path.join(root, "apps")
+      await mkdirp(appsDir)
+      await touch(path.join(appsDir, "pom.xml")) // Empty pom, no <module> declaration
+      const appDir = path.join(appsDir, "my-app")
+      await mkdirp(appDir)
+      await touch(path.join(appDir, "pom.xml"))
+      const srcDir = path.join(appDir, "src", "main", "java", "com", "example")
+      await mkdirp(srcDir)
+      await touch(path.join(srcDir, "App.java"))
+
+      const file = path.join(srcDir, "App.java")
+      const result = await LSPServer.JDTLS.root(file, makeCtx(root))
+      // apps/pom.xml has no <module>my-app</module> → stop at my-app
+      expect(result).toBe(appDir)
+    })
+
+    test("<module> with ./ prefix is normalized correctly", async () => {
+      const root = path.join(tmpBase, "dot-slash-module")
+      await mkdirp(root)
+      await Bun.write(path.join(root, "pom.xml"), "<project><modules><module>./module-a</module></modules></project>")
+      const childDir = path.join(root, "module-a")
+      await mkdirp(childDir)
+      await touch(path.join(childDir, "pom.xml"))
+      const srcDir = path.join(childDir, "src", "main", "java", "com", "example")
+      await mkdirp(srcDir)
+      await touch(path.join(srcDir, "App.java"))
+
+      const file = path.join(srcDir, "App.java")
+      const result = await LSPServer.JDTLS.root(file, makeCtx(root))
+      expect(result).toBe(root)
+    })
+
+    test("<module> with trailing slash is normalized correctly", async () => {
+      const root = path.join(tmpBase, "trailing-slash-module")
+      await mkdirp(root)
+      await Bun.write(path.join(root, "pom.xml"), "<project><modules><module>module-a/</module></modules></project>")
+      const childDir = path.join(root, "module-a")
+      await mkdirp(childDir)
+      await touch(path.join(childDir, "pom.xml"))
+      const srcDir = path.join(childDir, "src", "main", "java", "com", "example")
+      await mkdirp(srcDir)
+      await touch(path.join(srcDir, "App.java"))
+
+      const file = path.join(srcDir, "App.java")
+      const result = await LSPServer.JDTLS.root(file, makeCtx(root))
+      expect(result).toBe(root)
+    })
+  })
+
+  // -------------------------------------------------------------------------
+  // Gradle
+  // -------------------------------------------------------------------------
+  describe("Gradle", () => {
+    test("Gradle project with settings.gradle in a subdirectory of ctx.directory", async () => {
+      // Workspace root = ctx.directory, Gradle project in a subdirectory
+      const workspace = path.join(tmpBase, "gradle-sub")
+      await mkdirp(workspace)
+      const projectDir = path.join(workspace, "gradle-app")
+      await touch(path.join(projectDir, "settings.gradle"))
+      await touch(path.join(projectDir, "build.gradle"))
+      const srcDir = path.join(projectDir, "src", "main", "java", "com", "example")
+      await mkdirp(srcDir)
+      await touch(path.join(srcDir, "App.java"))
+
+      const file = path.join(srcDir, "App.java")
+      const result = await LSPServer.JDTLS.root(file, makeCtx(workspace))
+      expect(result).toBe(projectDir)
+    })
+
+    test("Gradle project with only build.gradle in a subdirectory", async () => {
+      const workspace = path.join(tmpBase, "gradle-build-sub")
+      await mkdirp(workspace)
+      const projectDir = path.join(workspace, "gradle-app")
+      await touch(path.join(projectDir, "build.gradle"))
+      const srcDir = path.join(projectDir, "src", "main", "java", "com", "example")
+      await mkdirp(srcDir)
+      await touch(path.join(srcDir, "App.java"))
+
+      const file = path.join(srcDir, "App.java")
+      const result = await LSPServer.JDTLS.root(file, makeCtx(workspace))
+      expect(result).toBe(projectDir)
+    })
+
+    test("Gradle monorepo with settings.gradle takes precedence over nested pom.xml", async () => {
+      const workspace = path.join(tmpBase, "gradle-monorepo")
+      await mkdirp(workspace)
+      const gradleRoot = path.join(workspace, "gradle-project")
+      await touch(path.join(gradleRoot, "settings.gradle"))
+      await touch(path.join(gradleRoot, "gradlew"))
+      // Submodule has pom.xml too
+      const subDir = path.join(gradleRoot, "module-a")
+      await mkdirp(subDir)
+      await touch(path.join(subDir, "pom.xml"))
+      const srcDir = path.join(subDir, "src", "main", "java", "com", "example")
+      await mkdirp(srcDir)
+      await touch(path.join(srcDir, "App.java"))
+
+      const file = path.join(srcDir, "App.java")
+      const result = await LSPServer.JDTLS.root(file, makeCtx(workspace))
+      // Gradle markers found at gradleRoot level
+      expect(result).toBe(gradleRoot)
+    })
+
+    test("settings.gradle.kts (Kotlin DSL) is recognized", async () => {
+      const workspace = path.join(tmpBase, "gradle-kts-settings")
+      await mkdirp(workspace)
+      const projectDir = path.join(workspace, "gradle-app")
+      await touch(path.join(projectDir, "settings.gradle.kts"))
+      const srcDir = path.join(projectDir, "src", "main", "java", "com", "example")
+      await mkdirp(srcDir)
+      await touch(path.join(srcDir, "App.java"))
+
+      const file = path.join(srcDir, "App.java")
+      const result = await LSPServer.JDTLS.root(file, makeCtx(workspace))
+      expect(result).toBe(projectDir)
+    })
+
+    test("build.gradle.kts (Kotlin DSL) is recognized", async () => {
+      const workspace = path.join(tmpBase, "gradle-kts-build")
+      await mkdirp(workspace)
+      const projectDir = path.join(workspace, "gradle-app")
+      await touch(path.join(projectDir, "build.gradle.kts"))
+      const srcDir = path.join(projectDir, "src", "main", "java", "com", "example")
+      await mkdirp(srcDir)
+      await touch(path.join(srcDir, "App.java"))
+
+      const file = path.join(srcDir, "App.java")
+      const result = await LSPServer.JDTLS.root(file, makeCtx(workspace))
+      expect(result).toBe(projectDir)
+    })
+
+    test("gradlew (without settings.gradle) in a subdirectory is recognized", async () => {
+      const workspace = path.join(tmpBase, "gradlew-sub")
+      await mkdirp(workspace)
+      const projectDir = path.join(workspace, "gradle-app")
+      await touch(path.join(projectDir, "gradlew"))
+      const srcDir = path.join(projectDir, "src", "main", "java", "com", "example")
+      await mkdirp(srcDir)
+      await touch(path.join(srcDir, "App.java"))
+
+      const file = path.join(srcDir, "App.java")
+      const result = await LSPServer.JDTLS.root(file, makeCtx(workspace))
+      expect(result).toBe(projectDir)
+    })
+
+    test("pom.xml is excluded when gradlew is present at same level", async () => {
+      const workspace = path.join(tmpBase, "gradle-excludes-maven")
+      await mkdirp(workspace)
+      const projectDir = path.join(workspace, "mixed-project")
+      // Both pom.xml and gradlew exist
+      await touch(path.join(projectDir, "pom.xml"))
+      await touch(path.join(projectDir, "gradlew"))
+      const srcDir = path.join(projectDir, "src", "main", "java", "com", "example")
+      await mkdirp(srcDir)
+      await touch(path.join(srcDir, "App.java"))
+
+      const file = path.join(srcDir, "App.java")
+      const result = await LSPServer.JDTLS.root(file, makeCtx(workspace))
+      // Gradle wrapper takes precedence
+      expect(result).toBe(projectDir)
+    })
+  })
+
+  // -------------------------------------------------------------------------
+  // Eclipse
+  // -------------------------------------------------------------------------
+  describe("Eclipse", () => {
+    test("Eclipse project with .project in a subdirectory", async () => {
+      const workspace = path.join(tmpBase, "eclipse-sub")
+      await mkdirp(workspace)
+      const projectDir = path.join(workspace, "eclipse-app")
+      await touch(path.join(projectDir, ".project"))
+      await touch(path.join(projectDir, ".classpath"))
+      const srcDir = path.join(projectDir, "src", "com", "example")
+      await mkdirp(srcDir)
+      await touch(path.join(srcDir, "App.java"))
+
+      const file = path.join(srcDir, "App.java")
+      const result = await LSPServer.JDTLS.root(file, makeCtx(workspace))
+      expect(result).toBe(projectDir)
+    })
+  })
+
+  // -------------------------------------------------------------------------
+  // No markers
+  // -------------------------------------------------------------------------
+  describe("No build markers", () => {
+    test("Java file with no build markers returns undefined", async () => {
+      const root = path.join(tmpBase, "no-build")
+      await mkdirp(root)
+      const srcDir = path.join(root, "src")
+      await mkdirp(srcDir)
+      await touch(path.join(srcDir, "App.java"))
+
+      const file = path.join(srcDir, "App.java")
+      const result = await LSPServer.JDTLS.root(file, makeCtx(root))
+      expect(result).toBeUndefined()
+    })
+  })
+
+  // -------------------------------------------------------------------------
+  // Additional validation scenarios
+  // -------------------------------------------------------------------------
+  describe("Additional Maven module-chain validation", () => {
+    // Scenario 1: <module> with multi-segment path (e.g. <module>tools/sample</module>)
+    test("<module> multi-segment path matches nested directory", async () => {
+      const root = path.join(tmpBase, "multi-seg-module")
+      await mkdirp(root)
+      await Bun.write(path.join(root, "pom.xml"), "<project><modules><module>tools/sample</module></modules></project>")
+      const childDir = path.join(root, "tools", "sample")
+      await mkdirp(childDir)
+      await touch(path.join(childDir, "pom.xml"))
+      const srcDir = path.join(childDir, "src", "main", "java", "com", "example")
+      await mkdirp(srcDir)
+      await touch(path.join(srcDir, "App.java"))
+
+      const file = path.join(srcDir, "App.java")
+      const result = await LSPServer.JDTLS.root(file, makeCtx(root))
+      expect(result).toBe(root)
+    })
+
+    // Scenario 2: <module> declaration does not match actual directory name
+    test("<module> declaration mismatch does not falsely match", async () => {
+      const root = path.join(tmpBase, "module-mismatch")
+      await mkdirp(root)
+      // Parent declares module-a, but actual directory is module-b
+      await Bun.write(path.join(root, "pom.xml"), "<project><modules><module>module-a</module></modules></project>")
+      const childDir = path.join(root, "module-b")
+      await mkdirp(childDir)
+      await touch(path.join(childDir, "pom.xml"))
+      const srcDir = path.join(childDir, "src", "main", "java", "com", "example")
+      await mkdirp(srcDir)
+      await touch(path.join(srcDir, "App.java"))
+
+      const file = path.join(srcDir, "App.java")
+      const result = await LSPServer.JDTLS.root(file, makeCtx(root))
+      // module-b is not declared as a module → stop at module-b
+      expect(result).toBe(childDir)
+    })
+
+    // Scenario 3: Multiple <module> declarations
+    test("multiple <module> declarations allow second module to traverse up", async () => {
+      const root = path.join(tmpBase, "multi-modules")
+      await mkdirp(root)
+      await Bun.write(
+        path.join(root, "pom.xml"),
+        "<project><modules><module>module-a</module><module>module-b</module></modules></project>",
+      )
+      const childA = path.join(root, "module-a")
+      await mkdirp(childA)
+      await touch(path.join(childA, "pom.xml"))
+      const childB = path.join(root, "module-b")
+      await mkdirp(childB)
+      await touch(path.join(childB, "pom.xml"))
+      const srcDir = path.join(childB, "src", "main", "java", "com", "example")
+      await mkdirp(srcDir)
+      await touch(path.join(srcDir, "App.java"))
+
+      const file = path.join(srcDir, "App.java")
+      const result = await LSPServer.JDTLS.root(file, makeCtx(root))
+      expect(result).toBe(root)
+    })
+
+    // Scenario 4: XML comments should not be matched as module declarations
+    test("XML-commented <module> is not matched", async () => {
+      const root = path.join(tmpBase, "commented-module")
+      await mkdirp(root)
+      await Bun.write(
+        path.join(root, "pom.xml"),
+        "<project><modules><!-- <module>module-a</module> --></modules></project>",
+      )
+      const childDir = path.join(root, "module-a")
+      await mkdirp(childDir)
+      await touch(path.join(childDir, "pom.xml"))
+      const srcDir = path.join(childDir, "src", "main", "java", "com", "example")
+      await mkdirp(srcDir)
+      await touch(path.join(srcDir, "App.java"))
+
+      const file = path.join(srcDir, "App.java")
+      const result = await LSPServer.JDTLS.root(file, makeCtx(root))
+      // Commented-out module should not be matched → stop at module-a
+      expect(result).toBe(childDir)
+    })
+
+    // Scenario 5: pom.xml at ctx.directory itself
+    test("pom.xml at ctx.directory itself is found correctly", async () => {
+      const root = path.join(tmpBase, "pom-at-ctx")
+      await mkdirp(root)
+      await touch(path.join(root, "pom.xml"))
+      const srcDir = path.join(root, "src", "main", "java", "com", "example")
+      await mkdirp(srcDir)
+      await touch(path.join(srcDir, "App.java"))
+
+      const file = path.join(srcDir, "App.java")
+      const result = await LSPServer.JDTLS.root(file, makeCtx(root))
+      expect(result).toBe(root)
+    })
+
+    // Scenario 6: Mixed Gradle + Maven sibling projects don't interfere
+    test("Maven and Gradle sibling projects don't interfere", async () => {
+      const workspace = path.join(tmpBase, "mixed-siblings")
+      await mkdirp(workspace)
+      // Gradle project
+      const gradleDir = path.join(workspace, "gradle-project")
+      await touch(path.join(gradleDir, "settings.gradle"))
+      const gradleSrc = path.join(gradleDir, "src", "main", "java", "com", "example")
+      await mkdirp(gradleSrc)
+      await touch(path.join(gradleSrc, "GradleApp.java"))
+      // Maven project
+      const mavenDir = path.join(workspace, "maven-project")
+      await touch(path.join(mavenDir, "pom.xml"))
+      const mavenSrc = path.join(mavenDir, "src", "main", "java", "com", "example")
+      await mkdirp(mavenSrc)
+      await touch(path.join(mavenSrc, "MavenApp.java"))
+
+      const gradleResult = await LSPServer.JDTLS.root(
+        path.join(gradleSrc, "GradleApp.java"),
+        makeCtx(workspace),
+      )
+      expect(gradleResult).toBe(gradleDir)
+
+      const mavenResult = await LSPServer.JDTLS.root(
+        path.join(mavenSrc, "MavenApp.java"),
+        makeCtx(workspace),
+      )
+      expect(mavenResult).toBe(mavenDir)
+    })
+  })
+})