Code completion not working

Code completion is all but non-existent when typing in a .java file.

Environment

• Operating System: macOS Mojave 10.14.4
• JDK version: 12.0.1
• Visual Studio Code version: 1.33.1
• Java extension version: 0.6.0

Steps To Reproduce

n-a

Logs:

Language support for java log:

[Error - 3:01:13 PM] 25 Apr. 2019, 3:01:13 pm Problems occurred when invoking code from plug-in: "org.eclipse.jdt.ls.core".
null
java.lang.NullPointerException
at com.microsoft.java.test.plugin.util.ProjectUtils.lambda$0(ProjectUtils.java:80)
at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:176)
at java.base/java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578)
at com.microsoft.java.test.plugin.util.ProjectUtils.parseProjects(ProjectUtils.java:83)
at com.microsoft.java.test.plugin.util.ProjectUtils.getTestSourcePaths(ProjectUtils.java:63)
at com.microsoft.java.test.plugin.handler.TestDelegateCommandHandler.executeCommand(TestDelegateCommandHandler.java:40)
at org.eclipse.jdt.ls.core.internal.handlers.WorkspaceExecuteCommandHandler$1.run(WorkspaceExecuteCommandHandler.java:151)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
at org.eclipse.jdt.ls.core.internal.handlers.WorkspaceExecuteCommandHandler.executeCommand(WorkspaceExecuteCommandHandler.java:141)
at org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.lambda$3(JDTLanguageServer.java:439)
at org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.lambda$33(JDTLanguageServer.java:835)
at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:642)
at java.base/java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:479)
at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)
at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020)
at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656)
at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594)
at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)

[Error - 3:01:13 PM] 25 Apr. 2019, 3:01:13 pm Error in calling delegate command handler
null
java.lang.NullPointerException
at com.microsoft.java.test.plugin.util.ProjectUtils.lambda$0(ProjectUtils.java:80)
at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:176)
at java.base/java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578)
at com.microsoft.java.test.plugin.util.ProjectUtils.parseProjects(ProjectUtils.java:83)
at com.microsoft.java.test.plugin.util.ProjectUtils.getTestSourcePaths(ProjectUtils.java:63)
at com.microsoft.java.test.plugin.handler.TestDelegateCommandHandler.executeCommand(TestDelegateCommandHandler.java:40)
at org.eclipse.jdt.ls.core.internal.handlers.WorkspaceExecuteCommandHandler$1.run(WorkspaceExecuteCommandHandler.java:151)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
at org.eclipse.jdt.ls.core.internal.handlers.WorkspaceExecuteCommandHandler.executeCommand(WorkspaceExecuteCommandHandler.java:141)
at org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.lambda$3(JDTLanguageServer.java:439)
at org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.lambda$33(JDTLanguageServer.java:835)
at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:642)
at java.base/java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:479)
at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)
at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020)
at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656)
at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594)
at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)

Current Result

Within a .java file, typing "class", amongst others, does not offer any code snippets.

Expected Result

Within a .java file, typing "class" should result in code snippet suggestions, as per https://code.visualstudio.com/docs/java/java-tutorial

Additional Informations

首先在 .java 文件中复现补全，并通过 parseProjects 和 getTestSourcePaths 跟踪 ProjectUtils.java:80 处记录的失败。检查 TestDelegateCommandHandler.executeCommand 以及 org.eclipse.jdt.ls.core 的调用路径。当输入 "class" 能够生成预期的 Java 代码片段建议，且不再出现报告的 NullPointerException 时，即表示完成。