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Editorial Team
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Asked: 2026-05-25T22:11:16+00:00

I have a class names test.java and another file log4j.properties in the same folder

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I have a class names test.java and another file “log4j.properties” in the same folder but following call

getClass().getResource("log4j.properties")

fails with 

ms
Trace:
sun.misc.InvalidJarIndexException: Invalid index
    at sun.misc.URLClassPath$JarLoader.getResource(Unknown Source)
    at sun.misc.URLClassPath$JarLoader.getResource(Unknown Source)
    at sun.misc.URLClassPath$JarLoader.findResource(Unknown Source)
    at sun.misc.URLClassPath.findResource(Unknown Source)
    at java.net.URLClassLoader$2.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findResource(Unknown Source)
    at java.lang.ClassLoader.getResource(Unknown Source)
    at java.lang.ClassLoader.getResource(Unknown Source)
    at java.lang.Class.getResource(Unknown Source)

But getClass().getClassLoader().getResource(“log4j.properties”) works. What can be the reason?

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1 Answer

  1. Editorial Team

    The InvalidJarIndexException is normally caused by a corrupt INDEX.LIST file in the JAR. So check the JAR for any problems. See http://littletechsecrets.wordpress.com/2008/12/01/why-does-invalidjarindexexception-occur/

    The different results you describe are probably related to Class.getResource() resolving a path relative to the classes package, and ClassLoader.getResource() resolving a path relative to the root. So getClass().getResource("/log4j.properties") might fix your problem.

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