TechQA.

Custom messages in xtext based language server

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I am trying to extend my language server to handle custom commands from VS Code client. To debug, I am using SocketLanguageServer. I send a custom command from the client:

client.sendRequest("custom/data", "foo").then(data => console.log(data));

Since the server is not aware of this command, as expected, I get

org.eclipse.lsp4j.jsonrpc.RemoteEndpoint fallbackResponseError
SEVERE: Internal error: The json request 'custom/data' is unknown.
java.lang.UnsupportedOperationException: The json request 'custom/data' is unknown.
    at org.eclipse.xtext.ide.server.LanguageServerImpl.request(LanguageServerImpl.java:1039)
    at org.eclipse.lsp4j.jsonrpc.services.GenericEndpoint.request(GenericEndpoint.java:127)
    at org.eclipse.lsp4j.jsonrpc.RemoteEndpoint.handleRequest(RemoteEndpoint.java:261)
    at org.eclipse.lsp4j.jsonrpc.RemoteEndpoint.consume(RemoteEndpoint.java:190)
    at org.eclipse.lsp4j.jsonrpc.validation.ReflectiveMessageValidator.consume(ReflectiveMessageValidator.java:68)
    at org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer.handleMessage(StreamMessageProducer.java:194)
    at org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer.listen(StreamMessageProducer.java:94)
    at org.eclipse.lsp4j.jsonrpc.json.ConcurrentMessageProcessor.run(ConcurrentMessageProcessor.java:113)
    at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    at java.base/java.lang.Thread.run(Thread.java:829)

Just by implementing ILanguageServerExtension (leaving it empty as below)

@JsonSegment("custom")
public class MyLanguageServerExtension implements ILanguageServerExtension {

    @Override
    public void initialize(ILanguageServerAccess access) {
        // TODO Auto-generated method stub
        
    }
}

and binding it in MyIdeModule

public class MyIdeModule extends AbstractKinematicsIdeModule {

    public Class<? extends ILanguageServerExtension> bindILanguageServerExtension() {
        return MyLanguageServerExtension.class;
    }
}

I don't get the error anymore, but the client still complains of the promise not accepted

stack trace: Error: Internal error.
    at handleResponse (./node_modules/vscode-jsonrpc/lib/common/connection.js:477:48)
    at processMessageQueue (./node_modules/vscode-jsonrpc/lib/common/connection.js:292:17)
    at Immediate.<anonymous> (./node_modules/vscode-jsonrpc/lib/common/connection.js:276:13)
    at process.processImmediate (node:internal/timers:466:21)
    at process.callbackTrampoline (node:internal/async_hooks:130:17)
/usr/share/code/resources/app/out/vs/workbench/api/node/out-vscode/vs/workbench/api/node/file:/mnt/vss/_work/1/s/src/vs/workbench/api/node/extHostConsoleForwarder.ts:31
rejected promise not handled within 1 second: Error [ERR_STREAM_DESTROYED]: Cannot call write after a stream was destroyed

There aren't many examples out there on how to use ILanguageServerExtension, and the ones which are available (e.g. sprotty) are way too complex. What is the minimal steps to make MyLanguageServerExtension aware of these custom commands?

Edit 1: I implemented the following function in MyLanguageServerExtension, but same behaviour

    @JsonNotification
    CompletableFuture <String>  data(String message) {
        System.out.println(message);
        CompletableFuture<String> completableFuture = new CompletableFuture<>();
        completableFuture.complete(message + " Hello from server!");
        return completableFuture;
    }

Edit 2: based on the code here: https://github.com/eclipse/xtext/blob/main/org.eclipse.xtext.ide/src/org/eclipse/xtext/ide/server/LanguageServerImpl.java#L1108-L1132 and the example here https://github.com/eclipse/xtext/blob/94c00e3ea5a6f952806a9e1a94b2325481e4eca4/org.eclipse.xtext.ide.tests/testlang-src/org/eclipse/xtext/ide/tests/testlanguage/ide/TestLangLSPExtension.java, I updated the code as follows

@JsonSegment("custom")
public class MyLanguageServerExtension implements JsonRpcMethodProvider, ILanguageServerExtension {

    
    private ILanguageServerAccess access;


    @Override
    public void initialize(ILanguageServerAccess access) {
        this.access = access;
    }

    @Override
    public Map<String, JsonRpcMethod> supportedMethods() {
        // Define the supported methods and their corresponding JSON-RPC handlers here
        Map<String, JsonRpcMethod> methods = new HashMap<>();
        methods.putAll(ServiceEndpoints.getSupportedMethods(getClass()));
        return methods;
    }
    
    @JsonRequest
    CompletableFuture <String>  data(String message) {
        System.out.println(message);
        return CompletableFuture.completedFuture(message + " Hello from server!");
    }
}

But still the method doesn't get called. The supportedMethods() gets called though. This is the print of methods

{custom/data=JsonRpcMethod (request) {
    methodName: custom/data
    parameterTypes: [Ljava.lang.reflect.Type;@56a4479a
    returnType: class java.lang.String
}}

Edit 3: failure trace of the test shown below

java.lang.TypeNotPresentException: Type [unknown] not present
    at java.base/sun.reflect.annotation.TypeNotPresentExceptionProxy.generateException(TypeNotPresentExceptionProxy.java:47)
    at java.base/sun.reflect.annotation.AnnotationInvocationHandler.invoke(AnnotationInvocationHandler.java:88)
    at com.sun.proxy.$Proxy28.value(Unknown Source)
    at org.eclipse.lsp4j.jsonrpc.services.ServiceEndpoints.lambda$getSupportedMethods$0(ServiceEndpoints.java:102)
    at org.eclipse.lsp4j.jsonrpc.services.AnnotationUtil.findRpcMethods(AnnotationUtil.java:66)
    at org.eclipse.lsp4j.jsonrpc.services.AnnotationUtil.findRpcMethods(AnnotationUtil.java:60)
    at org.eclipse.lsp4j.jsonrpc.services.ServiceEndpoints.getSupportedMethods(ServiceEndpoints.java:90)
    at org.eclipse.lsp4j.jsonrpc.services.ServiceEndpoints.getSupportedMethods(ServiceEndpoints.java:82)
    at org.eclipse.xtext.ide.server.LanguageServerImpl.supportedMethods(LanguageServerImpl.java:1060)
    at org.eclipse.xtext.testing.AbstractLanguageServerTest.setup(AbstractLanguageServerTest.java:252)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:688)
    at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)
    at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:149)
    at org.junit.jupiter.engine.extension.TimeoutExtension.interceptLifecycleMethod(TimeoutExtension.java:126)
    at org.junit.jupiter.engine.extension.TimeoutExtension.interceptBeforeEachMethod(TimeoutExtension.java:76)
    at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(ExecutableInvoker.java:115)
    at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(ExecutableInvoker.java:105)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37)
    at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104)
    at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:98)
    at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.invokeMethodInExtensionContext(ClassBasedTestDescriptor.java:490)
    at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$synthesizeBeforeEachMethodAdapter$19(ClassBasedTestDescriptor.java:475)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeBeforeEachMethods$2(TestMethodTestDescriptor.java:167)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeBeforeMethodsOrCallbacksUntilExceptionOccurs$5(TestMethodTestDescriptor.java:195)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeBeforeMethodsOrCallbacksUntilExceptionOccurs(TestMethodTestDescriptor.java:195)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeBeforeEachMethods(TestMethodTestDescriptor.java:164)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:127)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:65)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
    at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
    at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
    at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:107)
    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:88)
    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute$0(EngineExecutionOrchestrator.java:54)
    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams(EngineExecutionOrchestrator.java:67)
    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:52)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:114)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:95)
    at org.junit.platform.launcher.core.DefaultLauncherSession$DelegatingLauncher.execute(DefaultLauncherSession.java:91)
    at org.junit.platform.launcher.core.SessionPerRequestLauncher.execute(SessionPerRequestLauncher.java:60)
    at org.eclipse.jdt.internal.junit5.runner.JUnit5TestReference.run(JUnit5TestReference.java:98)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:40)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:529)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:756)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:452)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:210)
    Suppressed: java.lang.NullPointerException: Cannot invoke "java.io.File.exists()" because "this.root" is null
        at org.eclipse.xtext.testing.AbstractLanguageServerTest.cleanup(AbstractLanguageServerTest.java:262)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:564)
        at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:688)
        at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
        at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)
        at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:149)
        at org.junit.jupiter.engine.extension.TimeoutExtension.interceptLifecycleMethod(TimeoutExtension.java:126)
        at org.junit.jupiter.engine.extension.TimeoutExtension.interceptAfterEachMethod(TimeoutExtension.java:108)
        at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(ExecutableInvoker.java:115)
        at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(ExecutableInvoker.java:105)
        at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106)
        at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64)
        at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45)
        at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37)
        at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104)
        at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:98)
        at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.invokeMethodInExtensionContext(ClassBasedTestDescriptor.java:490)
        at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$synthesizeAfterEachMethodAdapter$20(ClassBasedTestDescriptor.java:480)
        at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeAfterEachMethods$9(TestMethodTestDescriptor.java:236)
        at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeAllAfterMethodsOrCallbacks$12(TestMethodTestDescriptor.java:269)
        at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
        at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeAllAfterMethodsOrCallbacks$13(TestMethodTestDescriptor.java:269)
        at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
        at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeAllAfterMethodsOrCallbacks(TestMethodTestDescriptor.java:268)
        at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeAfterEachMethods(TestMethodTestDescriptor.java:234)
        at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:135)
        ... 47 more
Caused by: java.lang.NoClassDefFoundError: com/google/gson/TypeAdapterFactory
    at java.base/java.lang.ClassLoader.defineClass1(Native Method)
    at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1017)
    at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:151)
    at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:821)
    at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:719)
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:642)
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:600)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
    at java.base/java.lang.Class.forName0(Native Method)
    at java.base/java.lang.Class.forName(Class.java:427)
    at java.base/sun.reflect.generics.factory.CoreReflectionFactory.makeNamedType(CoreReflectionFactory.java:114)
    at java.base/sun.reflect.generics.visitor.Reifier.visitClassTypeSignature(Reifier.java:125)
    at java.base/sun.reflect.generics.tree.ClassTypeSignature.accept(ClassTypeSignature.java:49)
    at java.base/sun.reflect.annotation.AnnotationParser.parseSig(AnnotationParser.java:440)
    at java.base/sun.reflect.annotation.AnnotationParser.parseClassValue(AnnotationParser.java:421)
    at java.base/sun.reflect.annotation.AnnotationParser.parseMemberValue(AnnotationParser.java:350)
    at java.base/sun.reflect.annotation.AnnotationParser.parseAnnotation2(AnnotationParser.java:287)
    at java.base/sun.reflect.annotation.AnnotationParser.parseAnnotations2(AnnotationParser.java:121)
    at java.base/sun.reflect.annotation.AnnotationParser.parseAnnotations(AnnotationParser.java:73)
    at java.base/java.lang.reflect.Executable.declaredAnnotations(Executable.java:614)
    at java.base/java.lang.reflect.Executable.declaredAnnotations(Executable.java:612)
    at java.base/java.lang.reflect.Executable.getAnnotation(Executable.java:582)
    at java.base/java.lang.reflect.Method.getAnnotation(Method.java:693)
    at org.eclipse.lsp4j.jsonrpc.services.AnnotationUtil.createMethodInfo(AnnotationUtil.java:78)
    at org.eclipse.lsp4j.jsonrpc.services.AnnotationUtil.findRpcMethods(AnnotationUtil.java:64)
    ... 78 more
Caused by: java.lang.ClassNotFoundException: com.google.gson.TypeAdapterFactory
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:602)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
    ... 104 more
java xtext language-server-protocol
Original Q&A
1

There are 1 answers

6
Christian Dietrich On

i gave it a quick try with this test and it works fine

public class DullyTest extends AbstractLanguageServerTest {

    public DullyTest() {
        super("mydsl");
    }


    @Test
    public void testit() throws InterruptedException, ExecutionException {
        initialize( (e) -> {});

        MessageConsumer consumer = new MessageConsumer() {
            @Override
            public void consume(Message message) throws MessageIssueException, JsonRpcException {
                System.out.println(message);
            }
        };
        // languageServer.supportedMethods();
        RemoteEndpoint endpoint = new RemoteEndpoint(consumer , languageServer);
        endpoint.consume(init(new RequestMessage(), it -> {
            it.setId("1");
            it.setMethod("custom/data");
            it.setParams("myparam");
        }));
    }

    static <T> T init(T value, Consumer<T> initializer) {
        initializer.accept(value);
        return value;
    }

}

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