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Home/ Questions/Q 6700755
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Editorial Team
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Editorial Team
Asked: May 26, 20262026-05-26T06:51:10+00:00 2026-05-26T06:51:10+00:00

I have installed openfire 3.7.1 and uploaded Kraken plugin (IM Gateway). It worked fine.

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I have installed openfire 3.7.1 and uploaded Kraken plugin (IM Gateway). It worked fine. But on restarting the system. Its dying every time. I have tried re-installing also.
A part of the error is mentioned below. Can anyone tell what is the issue?

Is Kraken not compatible with openfire 3.7.1?

Error: log4j:ERROR Could not instantiate class [net.sf.kraken.util.Log4JToOpenfireAppender].
java.lang.ClassNotFoundException: net.sf.kraken.util.Log4JToOpenfireAppender
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(NativeMethod)
at java.lang.Class.forName(Unknown Source)
at org.apache.log4j.helpers.Loader.loadClass(Loader.java:179)
at org.apache.log4j.helpers.OptionConverter.instantiateByClassName(OptionConverter.java:320)
at org.apache.log4j.helpers.OptionConverter.instantiateByKey(OptionConverter.java:121)
at org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigurator.java:664)
at ….

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  1. Editorial Team
    Editorial Team
    2026-05-26T06:51:11+00:00Added an answer on May 26, 2026 at 6:51 am

    I solved it.. it seems kraken 1.1.2 is causing this problem with openfire 3.7.1. Tried kraken 1.1.3 beta, and it is working fine

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