Do not exit if client and server are the same process.

For Java based clients, they may choose to run the LS application in the
same process. Calling System.exit() would terminate both which may not
be desired.

Author: mickaelistria

org.eclipse.jdt.ls.core/src/org/eclipse/jdt/ls/core/internal/LanguageServerApplication.java

@@ -23,7 +23,6 @@ public class LanguageServerApplication implements IApplication {
 
 	@Override
 	public Object start(IApplicationContext context) throws Exception {
-
 		JavaLanguageServerPlugin.startLanguageServer(this);
 		synchronized (waitLock) {
 			while (!shutdown) {
@@ -61,7 +60,7 @@ public void setParentProcessId(long pid) {
 	/**
 	 * @return the parentProcessId
 	 */
-	long getParentProcessId() {
+	public long getParentProcessId() {
 		return parentProcessId;
 	}
 }

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

@@ -46,6 +46,7 @@
 import org.eclipse.jdt.ls.core.internal.JavaClientConnection.JavaLanguageClient;
 import org.eclipse.jdt.ls.core.internal.JavaLanguageServerPlugin;
 import org.eclipse.jdt.ls.core.internal.JobHelpers;
+import org.eclipse.jdt.ls.core.internal.LanguageServerApplication;
 import org.eclipse.jdt.ls.core.internal.LanguageServerWorkingCopyOwner;
 import org.eclipse.jdt.ls.core.internal.ServiceStatus;
 import org.eclipse.jdt.ls.core.internal.codemanipulation.GenerateGetterSetterOperation.AccessorField;
@@ -448,10 +449,13 @@ public CompletableFuture<Object> shutdown() {
 	@Override
 	public void exit() {
 		logInfo(">> exit");
-		Executors.newSingleThreadScheduledExecutor().schedule(() -> {
-			logInfo("Forcing exit after 1 min.");
-			System.exit(FORCED_EXIT_CODE);
-		}, 1, TimeUnit.MINUTES);
+		LanguageServerApplication application = JavaLanguageServerPlugin.getLanguageServer();
+		if (application != null && application.getParentProcessId() != ProcessHandle.current().pid()) {
+			Executors.newSingleThreadScheduledExecutor().schedule(() -> {
+				logInfo("Forcing exit after 1 min.");
+				System.exit(FORCED_EXIT_CODE);
+			}, 1, TimeUnit.MINUTES);
+		}
 		if (!shutdownReceived) {
 			shutdownJob.schedule();
 		}