Errors running builder 'Maven Project Builder' on project 'project-name' (`"facade" is null`)

[robert-blankenship]

Unable to use any Java language features in VS Code.

Contains: Errors running builder 'Maven Project Builder' on project 'project-name'.
java.lang.NullPointerException: Cannot invoke "org.eclipse.m2e.core.internal.project.registry.MavenProjectFacade.getPom()" because "facade" is null
	at org.eclipse.m2e.core.internal.project.registry.ProjectRegistryManager.lambda$11(ProjectRegistryManager.java:799)
	at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:394)
	at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:275)
	at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:214)
	at org.eclipse.m2e.core.internal.project.registry.ProjectRegistryManager.readMavenProjectFacades(ProjectRegistryManager.java:760)
	at org.eclipse.m2e.core.internal.project.registry.ProjectRegistryManager.refresh(ProjectRegistryManager.java:392)
	at org.eclipse.m2e.core.internal.project.registry.ProjectRegistryManager.refresh(ProjectRegistryManager.java:366)
	at org.eclipse.m2e.core.internal.project.registry.ProjectRegistryManager.refresh(ProjectRegistryManager.java:318)
	at org.eclipse.m2e.core.internal.builder.MavenBuilder$BuildMethod.getProjectFacade(MavenBuilder.java:146)
	at org.eclipse.m2e.core.internal.builder.MavenBuilder$BuildMethod.lambda$0(MavenBuilder.java:84)
	at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:394)
	at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:275)
	at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:214)
	at org.eclipse.m2e.core.internal.builder.MavenBuilder$BuildMethod.execute(MavenBuilder.java:83)
	at org.eclipse.m2e.core.internal.builder.MavenBuilder.build(MavenBuilder.java:192)
	at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:1077)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:47)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:296)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:352)
	at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:441)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:47)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:444)
	at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:555)
	at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:503)
	at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:585)
	at org.eclipse.core.internal.resources.Workspace.buildInternal(Workspace.java:594)
	at org.eclipse.core.internal.resources.Workspace.build(Workspace.java:483)
	at org.eclipse.jdt.ls.core.internal.handlers.BuildWorkspaceHandler.buildWorkspace(BuildWorkspaceHandler.java:65)
	at org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.lambda$27(JDTLanguageServer.java:988)
	at org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.lambda$59(JDTLanguageServer.java:1216)
	at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:646)
	at java.base/java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:483)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182)
	at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165)

Environment

• Operating System: OSX 14.2.1
• JDK version: OpenJDK 17
• Visual Studio Code version: 1.86.0
• Java extension version:
  • v1.27.0 (Language support for Java(TM) by Red Hat)
  • v0.25.15 (Extension Pack for Java)

Steps To Reproduce

1. Run mvn eclipse:clean to delete .project, .settings/ and .classpath files at project and module levels. Clean Java Language Server workspace and restart VS Code.
2. Start VS code.

Current Result

No java language features are working, such as "Go To References". Maven reload does not work, project build does not work.

Expected Result

Java language features should be working.

Additional Informations

Settings:

    "java.jdt.ls.java.home": "/usr/local/opt/openjdk@17/libexec/openjdk.jdk/Contents/Home",
    "java.import.generatesMetadataFilesAtProjectRoot": true,

Running mvn install from the command line works fine.

My project has a root POM in a remote repo. There are several child <modules>, each with their own pom.xml

project-name/
  pom.xml
  module1/
    pom.xml
  module2/
    pom.xml
  module3/
    pom.xml

[snjeza]

@robert-blankenship Could you attach your project or pom.xml files?

[robert-blankenship]

@snjeza Sorry for the delay. I haven't forgotten about it.

It will take some time for me to create a clean project that reproduces the issue.