Some operations (hover, link...) failing for external files

[mickaelistria]

Let's make sure issue is not already fixed in snapshots first.

• [x] I verified I can reproduce this issue against latest snapshots build

Steps to reproduce

From a fresh installation and clean workspace:

• Empty workspace

I tried

• File > Open > browse to a dummy .java file (plain JDK, no dep to external libs)
• Use completion to generate a hashCode method and generate it
• Try to get hover documentation for this method

I expected: hover doc

But got: nothing

Here is some relevant log output form (<workspace>/.metadata/.log)

Log communication with JDT-LS mentions an error

{"jsonrpc":"2.0","id":"306","error":{"code":-32603,"message":"Internal error.","data":"java.util.concurrent.CompletionException: java.lang.NullPointerException: Cannot invoke \"org.eclipse.jdt.core.IType.getClassFile()\" because \"type\" is null\n\tat java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:315)\n\tat java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:320)\n\tat java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:649)\n\tat java.base/java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:483)\n\tat java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:387)\n\tat java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1312)\n\tat java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1843)\n\tat java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1808)\n\tat java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:188)\nCaused by: java.lang.NullPointerException: Cannot invoke \"org.eclipse.jdt.core.IType.getClassFile()\" because \"type\" is null\n\tat org.eclipse.jdt.ls.core.internal.JDTUtils.getClassFile(JDTUtils.java:492)\n\tat org.eclipse.jdt.ls.core.internal.JDTUtils.discardClassFileWorkingCopy(JDTUtils.java:478)\n\tat org.eclipse.jdt.ls.core.internal.handlers.HoverHandler.hover(HoverHandler.java:51)\n\tat org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.lambda$5(JDTLanguageServer.java:663)\n\tat org.eclipse.jdt.ls.core.internal.BaseJDTLanguageServer.lambda$0(BaseJDTLanguageServer.java:87)\n\tat java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:646)\n\t... 6 more\n"}}

Tested under this environment:

• OS & version: Fedora latest
• Eclipse IDE/Platform version: Eclipse SDK latest snapshot
• ...

Community

• [x] I understand reporting an issue to this OSS project does not mandate anyone to fix it. Other contributors may consider the issue, or not, at their own convenience. The most efficient way to get it fixed is that I fix it myself and contribute it back as a good quality patch to the project.

[mickaelistria]

This was fixed on LS end with https://github.com/eclipse-jdtls/eclipse.jdt.ls/commit/4769cd9070a6761cf5a483cd06881d5fd4b5a218