matthiasblaesing opened a new pull request, #4327:
URL: https://github.com/apache/netbeans/pull/4327
While working with a typescript project, I multiple times copied files,
renamed, edited and closed them. I noticed, that I got a
NullPointerException from the LanguageClientImpl:
```
java.lang.NullPointerException: Cannot invoke
"org.openide.filesystems.FileObject.getLookup()" because "file" is null
at
org.netbeans.modules.lsp.client.bindings.LanguageClientImpl.publishDiagnostics(LanguageClientImpl.java:161)
Caused: java.lang.reflect.InvocationTargetException
at
jdk.internal.reflect.GeneratedMethodAccessor159.invoke(Unknown Source)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at
org.eclipse.lsp4j.jsonrpc.services.GenericEndpoint.lambda$null$0(GenericEndpoint.java:65)
Caused: java.lang.RuntimeException
at
org.eclipse.lsp4j.jsonrpc.services.GenericEndpoint.lambda$null$0(GenericEndpoint.java:67)
at
org.eclipse.lsp4j.jsonrpc.services.GenericEndpoint.notify(GenericEndpoint.java:152)
```
This looks like a race condition between the LSP server reporting
diagnostics and the URLMapper being updated or the LSP server reporting
diagnostics after the file was already closed.
LanguageClientImpl#publishDiagnostics already guards against missing
EditorCookies and Documents, so this change just expands this to the
FileObject itself.
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