It happens with Language Support for Java.
Because of this error, my code will not be able to resolve the reference.

Please help me.

Error Messages:

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[Warn  - 9:37:53] 2021/08/01 9:37:53 While loading class "org.eclipse.buildship.core.internal.util.gradle.PublishedGradleVersions$LookupStrategy", thread "Thread[Worker-1: Loading available Gradle versions,5,main]" timed out waiting (30035ms) for thread "Thread[pool-2-thread-1,5,main]" to finish starting bundle "org.eclipse.buildship.core_3.1.5.v20210112-1646-s [14]". To avoid deadlock, thread "Thread[Worker-1: Loading available Gradle versions,5,main]" is proceeding but "org.eclipse.buildship.core.internal.util.gradle.PublishedGradleVersions$LookupStrategy" may not be fully initialized.

Unable to acquire the state change lock for the module: osgi.identity; type="osgi.bundle"; version:Version="3.1.5.v20210112-1646-s"; osgi.identity="org.eclipse.buildship.core"; singleton:="true" [id=14] STARTED [STARTED]

org.osgi.framework.BundleException: Unable to acquire the state change lock for the module: osgi.identity; type="osgi.bundle"; version:Version="3.1.5.v20210112-1646-s"; osgi.identity="org.eclipse.buildship.core"; singleton:="true" [id=14] STARTED [STARTED]

    at org.eclipse.osgi.container.Module.lockStateChange(Module.java:350)

    at org.eclipse.osgi.container.Module.start(Module.java:419)

    at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:511)

    at org.eclipse.osgi.internal.hooks.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:117)

    at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findLocalClass(ClasspathManager.java:572)

    at org.eclipse.osgi.internal.loader.ModuleClassLoader.findLocalClass(ModuleClassLoader.java:345)

    at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:401)

    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:480)

    at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:170)

    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:519)

    at org.eclipse.buildship.core.internal.util.gradle.PublishedGradleVersionsWrapper$LoadVersionsJob.run(PublishedGradleVersionsWrapper.java:60)

    at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)

Caused by: java.util.concurrent.TimeoutException: Timeout after waiting 30 seconds to acquire the lock.

    at org.eclipse.osgi.container.Module.lockStateChange(Module.java:347)

    ... 11 more

Caused by: org.eclipse.osgi.framework.util.ThreadInfoReport: Thread dump

...

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Edited August 1, 20214 yr by mgen256

I'm using forge-1.17.1-37.0.15-mdk, and the empty project starts without any problems.
I have no idea where the problem lies.

I may have simply needed to update the import. Sorry about that.