NullPointerException when listing code snippets

[Jonathan-Maciel]

On Ubuntu when pressing control + space to list the options for code snippets, the options are listed as expected.

This java error is printed to the ide log:

Jun 08, 2023 8:35:49 AM org.eclipse.lsp4j.jsonrpc.RemoteEndpoint fallbackResponseError
SEVERE: Internal error: java.lang.NullPointerException: Cannot invoke "org.eclipse.lsp4j.CompletionList.getItems()" because "list2" is null
java.util.concurrent.CompletionException: java.lang.NullPointerException: Cannot invoke "org.eclipse.lsp4j.CompletionList.getItems()" because "list2" is null
    at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:315)
    at java.base/java.util.concurrent.CompletableFuture.uniApplyNow(CompletableFuture.java:687)
    at java.base/java.util.concurrent.CompletableFuture.uniApplyStage(CompletableFuture.java:662)
    at java.base/java.util.concurrent.CompletableFuture.thenApply(CompletableFuture.java:2168)
    at org.eclipse.lsp4mp.ls.java.JavaFileTextDocumentService.lambda$completion$4(JavaFileTextDocumentService.java:171)
    at org.eclipse.lsp4mp.ls.java.JavaTextDocuments$JavaTextDocument.executeIfInMicroProfileProject(JavaTextDocuments.java:178)
    at org.eclipse.lsp4mp.ls.java.JavaTextDocuments$JavaTextDocument.lambda$executeIfInMicroProfileProject$1(JavaTextDocuments.java:167)
    at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1150)
    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)
Caused by: java.lang.NullPointerException: Cannot invoke "org.eclipse.lsp4j.CompletionList.getItems()" because "list2" is null
    at org.eclipse.lsp4mp.ls.java.JavaFileTextDocumentService.lambda$completion$3(JavaFileTextDocumentService.java:173)
    at java.base/java.util.concurrent.CompletableFuture.uniApplyNow(CompletableFuture.java:684)
    ... 12 more

No message is alerted up to the ide notifications this is only present in the log.

I also saw this possibly related message on starting the ide.

SEVERE: Error while consumming snippet loader org.eclipse.lsp4mp.snippets.MicroProfileJavaSnippetRegistryLoader
java.lang.NullPointerException
    at java.base/java.io.Reader.<init>(Reader.java:168)
    at java.base/java.io.InputStreamReader.<init>(InputStreamReader.java:97)
    at org.eclipse.lsp4mp.ls.commons.snippets.SnippetRegistry.registerSnippets(SnippetRegistry.java:153)
    at org.eclipse.lsp4mp.ls.commons.snippets.SnippetRegistry.registerSnippets(SnippetRegistry.java:126)
    at org.eclipse.lsp4mp.snippets.MicroProfileJavaSnippetRegistryLoader.load(MicroProfileJavaSnippetRegistryLoader.java:31)
    at org.eclipse.lsp4mp.ls.commons.snippets.SnippetRegistry.lambda$new$0(SnippetRegistry.java:85)
    at java.base/java.lang.Iterable.forEach(Iterable.java:75)
    at org.eclipse.lsp4mp.ls.commons.snippets.SnippetRegistry.<init>(SnippetRegistry.java:82)
    at org.eclipse.lsp4mp.ls.commons.snippets.TextDocumentSnippetRegistry.<init>(TextDocumentSnippetRegistry.java:43)
    at org.eclipse.lsp4mp.ls.java.JavaTextDocumentSnippetRegistry.<init>(JavaTextDocumentSnippetRegistry.java:51)
    at org.eclipse.lsp4mp.ls.java.JavaTextDocumentSnippetRegistry.<init>(JavaTextDocumentSnippetRegistry.java:47)
    at org.eclipse.lsp4mp.ls.java.JavaTextDocuments.getSnippetRegistry(JavaTextDocuments.java:297)
    at org.eclipse.lsp4mp.ls.java.JavaTextDocuments.getProjectInfoFromCache(JavaTextDocuments.java:243)
    at org.eclipse.lsp4mp.ls.java.JavaTextDocuments.getProjectInfo(JavaTextDocuments.java:218)
    at org.eclipse.lsp4mp.ls.java.JavaTextDocuments.access$300(JavaTextDocuments.java:47)
    at org.eclipse.lsp4mp.ls.java.JavaTextDocuments$JavaTextDocument.lambda$executeIfInMicroProfileProject$1(JavaTextDocuments.java:153)
    at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1150)
    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)

[TrevCraw]

This error can most likely be attributed to the fact that the LSP4MP snippet JSONs were removed from the test driver. The JSON snippets will be available once https://github.com/OpenLiberty/liberty-tools-intellij/issues/431 is resolved.

[anusreelakshmi934]

Tested using the latest lsp4ij feature branch (version - 0.0.2) . Did not see the above error printed in the IDE log.

[turkeylurkey]

Also could not reproduce.