StringIndexOutOfBoundsException in JDTUtils.getPackageName(IJavaProject, URI)

[snjeza]

The issue happens when creating a new file in the src directory.
It is similar to redhat-developer/vscode-java#312

Stacktrace

[Error - 1:02:17 AM] Request textDocument/codeAction failed. Message: Internal error, please look at the server's logs. Code: -32603 [Error - 1:02:17 AM] Request textDocument/codeLens failed. Message: Internal error, please look at the server's logs. Code: -32603 [Error - 1:02:22 AM] Oct 3, 2017 12:59:45 AM Problem with codeComplete for file:///home/snjeza/testlsp/teststandalone/foo/src/T.java String index out of range: -1 java.lang.StringIndexOutOfBoundsException: String index out of range: -1 at java.lang.String.substring(String.java:1931) at org.eclipse.jdt.ls.core.internal.JDTUtils.getPackageName(JDTUtils.java:203) at org.eclipse.jdt.ls.core.internal.JDTUtils.getFakeCompilationUnit(JDTUtils.java:158) at org.eclipse.jdt.ls.core.internal.JDTUtils.resolveCompilationUnit(JDTUtils.java:136) at org.eclipse.jdt.ls.core.internal.JDTUtils.resolveCompilationUnit(JDTUtils.java:109) at org.eclipse.jdt.ls.core.internal.handlers.CompletionHandler.completion(CompletionHandler.java:37) at org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.lambda$3(JDTLanguageServer.java:275) at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:602) at java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:577) at java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:443) at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056) at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692) at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)

[Error - 1:02:23 AM] Request textDocument/codeLens failed.
Message: Internal error, please look at the server's logs.
Code: -32603
[Error - 1:02:23 AM] Request textDocument/codeLens failed.
Message: Internal error, please look at the server's logs.
Code: -32603