Vscode-java: Couldn't start client language support for Java

Created on 29 Nov 2016 · 18Comments · Source: redhat-developer/vscode-java

When I open a java file, I got the following message: "Couldn't start client language support for Java". "Java 8 is required to run. Please download and install a jdk 8)

I just installed the latest jdk

Environment

Operating System: (Mac OS 10.12.1)
JDK version: (1.8.0_112)
Visual Studio Code version: (1.7.2)
Java extension version: (0.0.7)

question

Source

yuren1978

Most helpful comment

Have you looked at https://github.com/redhat-developer/vscode-java#setting-the-jdk?
Can you open a terminal and type:
echo $JAVA_HOME

Anyways, setting java.home in VS Code preferences should work

{
   "java.home": "/Library/Java/JavaVirtualMachines/jdk1.8.0_112.jdk/Contents/Home/"
}

fbricon on 29 Nov 2016

👍7

All 18 comments

Have you looked at https://github.com/redhat-developer/vscode-java#setting-the-jdk?
Can you open a terminal and type:
echo $JAVA_HOME

Anyways, setting java.home in VS Code preferences should work

{
   "java.home": "/Library/Java/JavaVirtualMachines/jdk1.8.0_112.jdk/Contents/Home/"
}

fbricon on 29 Nov 2016

👍7

Thanks, this helped!

yuren1978 on 30 Nov 2016

This happens to me too. I have java.home set to java 8, but I need $JAVA_HOMEset to the java 7 jdk.

{
  // ...
  "java.home": "/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home",
  // ...
}

This is macOS sierra.

❯ /usr/libexec/java_home -v 1.8
/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home

❯ echo $JAVA_HOME
/Library/Java/JavaVirtualMachines/jdk1.7.0_80.jdk/Contents/Home

Is there some knwon workaround?

ferhtgoldaraz on 5 May 2017

@ferhtgoldaraz what exactly is your issue? The java.home preference takes precedence over the JAVA_HOME environment variable, so you can have one set to 1.8 and the other to 1.7.

You can check which version is actually used to run the Java Language Server by opening the vscode-java logs.

fbricon on 5 May 2017

where is the location of settings.json for edit java.home in linux. Please

manuelsfd on 1 Jun 2017

@manuelsfd see https://code.visualstudio.com/docs/getstarted/settings#_creating-user-and-workspace-settings

fbricon on 1 Jun 2017

thanks for the answer @fbricon, But I still have the issue.

this is my java.home

"java.home": "/usr/lib/jvm/java-8-oracle"

my environment is

JAVA_HOME="/usr/lib/jvm/java-8-oracle"

i use ubuntu 17.04 and this is my issue

[Error - 14:19:55] Starting client failed
13

manuelsfd on 2 Jun 2017

@manuelsfd can you provide more logs?

fbricon on 2 Jun 2017

@fbricon I'm not sure this is the .log but it was the one I found, thanks for your time, I'm new to the linux world

[!ENTRY org.eclipse.jdt.ls.core 1 0 2017-06-02 14:19:53.670
!MESSAGE class org.eclipse.jdt.ls.core.internal.JavaLanguageServerPlugin is stopping:

!ENTRY org.eclipse.jdt.ls.core 1 0 2017-06-02 14:19:53.770
!MESSAGE Thread[Framework Event Dispatcher: org.eclipse.osgi.internal.framework.EquinoxEventPublisher@c562f7,5,main]
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:502)
at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.getNextEvent(EventManager.java:400)
at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:336)
Thread[Worker-1,5,main]
at java.lang.Object.wait(Native Method)
at org.eclipse.core.internal.jobs.WorkerPool.sleep(WorkerPool.java:188)
at org.eclipse.core.internal.jobs.WorkerPool.startJob(WorkerPool.java:220)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:52)
Thread[Worker-JM,5,main]
at java.lang.Object.wait(Native Method)
at org.eclipse.core.internal.jobs.InternalWorker.run(InternalWorker.java:59)
Thread[Start Level: Equinox Container: daf20e1c-4432-4e9d-9656-2785356542d7,5,main]
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:502)
at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.getNextEvent(EventManager.java:400)
at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:336)
Thread[Signal Dispatcher,9,system]
Thread[Framework stop,5,main]
at java.lang.Thread.dumpThreads(Native Method)
at java.lang.Thread.getAllStackTraces(Thread.java:1610)
at org.eclipse.jdt.ls.core.internal.JavaLanguageServerPlugin.getThreadDump(JavaLanguageServerPlugin.java:235)
at org.eclipse.jdt.ls.core.internal.JavaLanguageServerPlugin.stop(JavaLanguageServerPlugin.java:226)
at org.eclipse.osgi.internal.framework.BundleContextImpl$4.run(BundleContextImpl.java:835)
at org.eclipse.osgi.internal.framework.BundleContextImpl$4.run(BundleContextImpl.java:1)
at java.security.AccessController.doPrivileged(Native Method)
at org.eclipse.osgi.internal.framework.BundleContextImpl.stop(BundleContextImpl.java:828)
at org.eclipse.osgi.internal.framework.EquinoxBundle.stopWorker0(EquinoxBundle.java:947)
at org.eclipse.osgi.internal.framework.EquinoxBundle$EquinoxModule.stopWorker(EquinoxBundle.java:314)
at org.eclipse.osgi.container.Module.doStop(Module.java:636)
at org.eclipse.osgi.container.Module.stop(Module.java:498)
at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.decStartLevel(ModuleContainer.java:1669)
at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.doContainerStartLevel(ModuleContainer.java:1588)
at org.eclipse.osgi.container.SystemModule.stopWorker(SystemModule.java:270)
at org.eclipse.osgi.internal.framework.EquinoxBundle$SystemBundle$EquinoxSystemModule.stopWorker(EquinoxBundle.java:147)
at org.eclipse.osgi.container.Module.doStop(Module.java:636)
at org.eclipse.osgi.container.Module.stop(Module.java:498)
at org.eclipse.osgi.container.SystemModule.stop(SystemModule.java:202)
at org.eclipse.osgi.internal.framework.EquinoxBundle$SystemBundle$EquinoxSystemModule$1.run(EquinoxBundle.java:165)
at java.lang.Thread.run(Thread.java:748)
Thread[Java indexing,4,main]
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:502)
at org.eclipse.jdt.internal.core.search.processing.JobManager.run(JobManager.java:373)
at java.lang.Thread.run(Thread.java:748)
Thread[Refresh Thread: Equinox Container: daf20e1c-4432-4e9d-9656-2785356542d7,5,main]
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:502)
at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.getNextEvent(EventManager.java:400)
at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:336)
Thread[process reaper,10,system]
at sun.misc.Unsafe.park(Native Method)
at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
at java.util.concurrent.SynchronousQueue$TransferStack.awaitFulfill(SynchronousQueue.java:460)
at java.util.concurrent.SynchronousQueue$TransferStack.transfer(SynchronousQueue.java:362)
at java.util.concurrent.SynchronousQueue.poll(SynchronousQueue.java:941)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1066)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:748)
Thread[Worker-0,5,main]
at java.lang.Object.wait(Native Method)
at org.eclipse.core.internal.jobs.WorkerPool.sleep(WorkerPool.java:188)
at org.eclipse.core.internal.jobs.WorkerPool.startJob(WorkerPool.java:220)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:52)
Thread[Finalizer,8,system]
at java.lang.Object.wait(Native Method)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209)
Thread[main,5,main]
at java.lang.Object.wait(Native Method)
at org.eclipse.osgi.container.SystemModule.waitForStop(SystemModule.java:168)
at org.eclipse.osgi.internal.framework.EquinoxBundle$SystemBundle.waitForStop(EquinoxBundle.java:250)
at org.eclipse.osgi.launch.Equinox.waitForStop(Equinox.java:181)
at org.eclipse.core.runtime.adaptor.EclipseStarter.shutdown(EclipseStarter.java:444)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:262)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:653)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:590)
at org.eclipse.equinox.launcher.Main.run(Main.java:1499)
at org.eclipse.equinox.launcher.Main.main(Main.java:1472)
Thread[Active Thread: Equinox Container: daf20e1c-4432-4e9d-9656-2785356542d7,5,main]
at sun.misc.Unsafe.park(Native Method)
at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1093)
at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:748)
Thread[Reference Handler,10,system]
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:502)
at java.lang.ref.Reference.tryHandlePending(Reference.java:191)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153)
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manuelsfd on 3 Jun 2017

This .log found it on this route.

./.config/Code/User/workspaceStorage/b1e96030e2756963de66f71f1c0c2686/redhat.java/jdt_ws/.metadata/.log

manuelsfd on 3 Jun 2017

Can you try deleting ./.config/Code/User/workspaceStorage/b1e96030e2756963de66f71f1c0c2686 and restart?

fbricon on 3 Jun 2017

this is my new log.

log.pdf

manuelsfd on 3 Jun 2017

@manuelsfd seems like you've hit #201. Long story short, vscode-java doesn't run on Linux 32b.

fbricon on 3 Jun 2017

jajaja @fbricon ok, thanks for your time.

manuelsfd on 3 Jun 2017

Today I started getting problems too.

JAVA_HOME is set in my .bashrc file to
"/Library/Java/JavaVirtualMachines/jdk1.8.0_05.jdk/Contents/Home"

As of this afternoon, when I open the java project in VSCode that I've been working on every day, I get: "Couldn't start client Language Support for Java"

Adding this to my user settings or workspace settings and reloading the project doesn't help
"java.home": "/Library/Java/JavaVirtualMachines/jdk1.8.0_05.jdk/Contents/Home",

I am using OSX 10.12.5 and VS Code 1.13.0
My project is this.

It was working this morning. :/

It's probably not related, but VS Code is using the CPU a lot more as of late. It constantly says "Starting Java Language Server" next to a spinning circle of dots in the status bar.

dancancro on 12 Jun 2017

Strange. I just installed a VSCode update. At first Java Language Support worked. Then I closed that project, opened another one, and reopened the first one, and the old problem was back.

dancancro on 15 Jun 2017

Can you please attach your logs? https://github.com/redhat-developer/vscode-java/wiki/Troubleshooting

fbricon on 15 Jun 2017

i have downloaded all the plugins from the marketplace for the java and it shows the language support error in the vs Code when i run the code the tomcat it could not run in the browser .I have set the path of the java the command java -version and javac works in the command and in vs code it show the java path error .The eclipse also wont open in my desktop.

Can you fix the all of the problem?? Help me..