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I have taken checkout of latest code of openmeetings from their GitHub mirror repository. While running openmeeting-web, I am getting following exception. 

 INFO 08-14 13:03:54.013 33 81 ROOT [0.0-startStop-1] - Starting up context:openmeetings-web
Filter init: openmeetings-web
Aug 14, 2017 1:03:54 PM org.apache.catalina.core.StandardContext filterStart
SEVERE: Exception starting filter [OpenmeetingsApplication]
java.lang.LinkageError: loader constraint violation: when resolving method "org.slf4j.impl.StaticLoggerBinder.getLoggerFactory()Lorg/slf4j/ILoggerFactory;" the class loader (instance of org/apache/catalina/loader/ParallelWebappClassLoader) of the current class, org/slf4j/LoggerFactory, and the class loader (instance of java/net/URLClassLoader) for the method's defining class, org/slf4j/impl/StaticLoggerBinder, have different Class objects for the type org/slf4j/ILoggerFactory used in the signature
    at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:418)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:357)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:383)
    at org.apache.wicket.protocol.http.WicketFilter.<clinit>(WicketFilter.java:66)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:120)
    at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:264)
    at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:108)
    at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4590)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5233)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1419)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1409)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

I understood the exception is coming due to multiple slf4j jars. But I am not getting the exact solution to solve this error. Please help.

Anuja Kothekar
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1 Answers1

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In case you are building from sources you most probably need unpacked build as described here: http://openmeetings.apache.org/BuildInstructions.html#Tips_and_Gotchas

then perform

cd openmeetings-server/target/server ./red5-debug.sh

Maxim Solodovnik
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  • I have tried building source with unpacked build, still same exception I am getting. – Anuja Kothekar Aug 22 '17 at 12:01
  • OpenMeetings doesn't provides such output on start ... Please perform the exact steps I have provided in my answer – Maxim Solodovnik Aug 23 '17 at 14:59
  • okay this steps will start the red5 server. Can you point me to link where I can find proper guidance to do modifications in openmeetings source code, build it and publish it on localhost. I have worked with red5 but with openmeeting I am getting confused. So if I am getting proper direction that will be helpful. – Anuja Kothekar Aug 24 '17 at 05:35