IntelliJ fails to compile with ClassNotFoundException: org.apache.log4j.Priority

Question

I just installed IntelliJ on a new Mac OS and trying to compile a very simple basic Java app. Here is what I'm getting:

Information:2/5/15, 10:40 AM - Compilation completed with 1 error and 0 warnings in 11 sec
Error:Abnormal build process termination: 
Build process started. Classpath: /Applications/IntelliJ IDEA 14 CE.app/Contents/lib/jps-launcher.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_20.jdk/Contents/Home/lib/tools.jar:/Applications/IntelliJ IDEA 14 CE.app/Contents/lib/optimizedFileManager.jar:/Applications/IntelliJ IDEA 14 CE.app/Contents/lib/ecj-4.4.jar
Exception in thread "main" java.lang.reflect.InvocationTargetException
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:483)
  at org.jetbrains.jps.cmdline.Launcher.main(Launcher.java:58)
Caused by: java.lang.NoClassDefFoundError: org/apache/log4j/Priority
  at io.netty.util.internal.logging.Log4JLoggerFactory.newInstance(Log4JLoggerFactory.java:29)
  at io.netty.util.internal.logging.InternalLoggerFactory.getInstance(InternalLoggerFactory.java:84)
  at io.netty.util.internal.logging.InternalLoggerFactory.getInstance(InternalLoggerFactory.java:77)
  at io.netty.channel.MultithreadEventLoopGroup.<clinit>(MultithreadEventLoopGroup.java:32)
  at org.jetbrains.jps.cmdline.BuildMain.main(BuildMain.java:96)
  ... 5 more
Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Priority
  at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
  at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
  ... 10 more

Never seen this before. What can I do to fix it? I already installed IntelliJ from scratch.

I don't see any indication that log4j is on your classpath. Did you check that? — dcsohl
– dcsohl, Commented Feb 5, 2015 at 19:09
How exactly did you install IntelliJ IDEA? Looks like your installation is corrupt and is missing some of the jar files. — yole
– yole, Commented Feb 5, 2015 at 20:06
The files are all there, including the log4j.jar. Do you know where I can fix the classpath of IntelliJ IDEA itself? I tried Info.plist, but my changes don't make any effect — yegor256
– yegor256, Commented Feb 5, 2015 at 20:23

yegor256 · Accepted Answer · 2015-02-06 17:47:14Z

3

There was a file in /Library/Java/Extensions called netty.jar. I deleted it and the problem disappeared.

answered Feb 6, 2015 at 17:47

yegor256

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3 Comments

Peter Gibson Over a year ago

I'm having a similar problem with log4j - how did you determine where the problem jar was?

Peter Gibson Over a year ago

Okay, I moved everything out of /Library/Java/Extensions and it's now working. You should mark your answer as the accepted solution.

Baptiste Pernet Over a year ago

I have the same error and my /Library/Java/Extensions is empty

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