Add an extendedClientCapability to skip project configuration.

In some contexts (eg running inside Eclipse IDE), the project
configuration is already present and maintained, so JDT-LS shouldn't try
to override it.

org.eclipse.jdt.ls.core/src/org/eclipse/jdt/ls/core/internal/handlers/JDTLanguageServer.java

@@ -932,8 +932,10 @@ public CompletableFuture<BuildWorkspaceStatus> buildProjects(ProjectBuildParams
  @Override
  public void didChangeWorkspaceFolders(DidChangeWorkspaceFoldersParams params) {
  logInfo(">> java/didChangeWorkspaceFolders");
- WorkspaceFolderChangeHandler handler = new WorkspaceFolderChangeHandler(pm, preferenceManager);
- handler.update(params);
+ if (!preferenceManager.getClientPreferences().skipProjectConfiguration()) {
+ WorkspaceFolderChangeHandler handler = new WorkspaceFolderChangeHandler(pm, preferenceManager);
+ handler.update(params);
+ }
  }
 
  @Override

org.eclipse.jdt.ls.core/src/org/eclipse/jdt/ls/core/internal/managers/ProjectsManager.java

@@ -101,20 +101,22 @@ public ProjectsManager(PreferenceManager preferenceManager) {
 
  @Override
  public void initializeProjects(final Collection<IPath> rootPaths, IProgressMonitor monitor) throws CoreException, OperationCanceledException {
- SubMonitor subMonitor = SubMonitor.convert(monitor, 100);
- cleanInvalidProjects(rootPaths, subMonitor.split(20));
- createJavaProject(getDefaultProject(), subMonitor.split(10));
- cleanupResources(getDefaultProject());
- Collection<IPath> projectConfigurations = preferenceManager.getPreferences().getProjectConfigurations();
- if (projectConfigurations == null) {
- // old way to import project
- importProjects(rootPaths, subMonitor.split(70));
- } else {
- importProjectsFromConfigurationFiles(rootPaths, projectConfigurations, monitor);
+ if (!preferenceManager.getClientPreferences().skipProjectConfiguration()) {
+ SubMonitor subMonitor = SubMonitor.convert(monitor, 100);
+ cleanInvalidProjects(rootPaths, subMonitor.split(20));
+ createJavaProject(getDefaultProject(), subMonitor.split(10));
+ cleanupResources(getDefaultProject());
+ Collection<IPath> projectConfigurations = preferenceManager.getPreferences().getProjectConfigurations();
+ if (projectConfigurations == null) {
+ // old way to import project
+ importProjects(rootPaths, subMonitor.split(70));
+ } else {
+ importProjectsFromConfigurationFiles(rootPaths, projectConfigurations, monitor);
+ }
+ updateEncoding(monitor);
+ reportProjectsStatus();
+ subMonitor.done();
  }
- updateEncoding(monitor);
- reportProjectsStatus();
- subMonitor.done();
  }
 
  private void updateEncoding(IProgressMonitor monitor) throws CoreException {

org.eclipse.jdt.ls.core/src/org/eclipse/jdt/ls/core/internal/preferences/ClientPreferences.java

@@ -421,6 +421,10 @@ public boolean isChangeAnnotationSupport() {
  && capabilities.getWorkspace() != null
  && capabilities.getWorkspace().getWorkspaceEdit() != null
  && capabilities.getWorkspace().getWorkspaceEdit().getChangeAnnotationSupport() != null;
+ }
+
+ public boolean skipProjectConfiguration() {
+ return Boolean.parseBoolean(extendedClientCapabilities.getOrDefault("skipProjectConfiguration", "false").toString());
  }
 
 }

org.eclipse.jdt.ls.tests/src/org/eclipse/jdt/ls/core/internal/AbstractWorkspaceTest.java

@@ -12,6 +12,9 @@
  *******************************************************************************/
 package org.eclipse.jdt.ls.core.internal;
 
+import java.util.Map;
+
+import org.eclipse.lsp4j.ClientCapabilities;
 import org.junit.AfterClass;
 import org.junit.BeforeClass;
 
@@ -23,6 +26,7 @@ public abstract class AbstractWorkspaceTest {
 
  @BeforeClass
  public static void initWorkspace() throws Exception {
+ JavaLanguageServerPlugin.getPreferencesManager().updateClientPrefences(new ClientCapabilities(), Map.of());
  WorkspaceHelper.initWorkspace();
  }