microsoft / microsoft/azure-tools-for-java
[IntelliJ] Uncaught Exception java.lang.NullPointerException: Cannot invoke "com.intellij.openapi.vfs.VirtualFile.getExtension()" because "virtualFile" is null
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Description
IntelliJ build version: 2026.1.1 IU-261.23567.138
OS: Mac OS X
JDK: JetBrains s.r.o. 25.0.2
Plugin version: 3.97.5-2026.1
Additional Info: None
Parent component:
com.intellij.openapi.wm.impl.IdeRootPane[,0,0,2560x1409,layout=com.intellij.openapi.wm.impl.IdeRootPane$CustomHeaderRootLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=449,maximumSize=,minimumSize=,preferredSize=]
Error message:
IdeaLoggingEvent[message=null, throwable=java.lang.NullPointerException: Cannot invoke "com.intellij.openapi.vfs.VirtualFile.getExtension()" because "virtualFile" is null
at org.wso2.lsp4intellij.IntellijLanguageClient.lambda$isExtensionSupported$6(IntellijLanguageClient.java:174)
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
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- Open a pull request that references the issue number.
Research direction
Start at org.wso2.lsp4intellij.IntellijLanguageClient.java:174 and reproduce the exception with IntelliJ IU-261.23567.138 on macOS. Trace why virtualFile is null during isExtensionSupported; done means the reported uncaught exception no longer occurs in that environment and the relevant behavior is covered by a regression test.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- java
- Domain
- devtools
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Quiet
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100