microsoft / microsoft/azure-tools-for-java

[IntelliJ] Uncaught Exception java.lang.NoClassDefFoundError: rx/plugins/RxJavaHooks

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Dominant language
Java
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Description

IntelliJ build version: 2025.3.4 IU-253.32098.37
OS: Mac OS X
JDK: JetBrains s.r.o. 21.0.10
Plugin version: 3.97.3-2025.3
Additional Info: None
Parent component:

com.intellij.openapi.wm.impl.IdeRootPane[,0,0,1400x842,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.NoClassDefFoundError: <REDACTED: user-file-path>
	at com.microsoft.azure.toolkit.lib.common.task.AzureRxTaskManager.register(AzureRxTaskManager.java:26)
	at com.microsoft.azure.toolkit.intellij.base.PluginLifecycleListener.appFrameCreated(PluginLifecycleListener.java:56)
Caused by: java.lang.ClassNotFoundException: rx.plugins.RxJavaHooks PluginClassLoader(plugin=PluginMainDescriptor(name=Azure Toolkit for IntelliJ, id=com.microsoft.tooling.msservices.intellij.azure, version=3.97.3-2025.3, isBundled=false, path=~<REDACTED: user-file-path> <REDACTED: user-file-path>), packagePrefix=null, state=active, parents=ContentModuleDescriptor(id=intellij.terminal.sh, package=org.jetbrains.plugins.terminal.sh) <- PluginMainDescriptor(name=Terminal, id=org.jetbrains.plugins.terminal, version=253.32098.37, package

Contributor guide

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First steps

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  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start at AzureRxTaskManager.java line 26 and PluginLifecycleListener.java line 56, then inspect the reported NoClassDefFoundError for rx.plugins.RxJavaHooks when the IntelliJ application frame is created. Reproduce with the listed IntelliJ, JDK, plugin, and macOS versions; done means the plugin starts without this uncaught exception.

Written by the indexing model from the issue text.

Assessment

Tech stack
java
Domain
tooling
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
42/100

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