Description:
Unable to start BW engine when BE 5.1 is installed along with BW 5.10.
Symptoms:
The following exception will be thrown during startup.

“caused by: java.lang.VerifyError: class com.tibco.bw.service.binding.bwhttp.tomc
at.TomcatRepoRealm overrides final method start.()V”

Caused by: An exception occurred while trying to initialize the Http server: %1
                at com.tibco.plugin.http.HTTPEventSource.activate(Unknown Source)
                at com.tibco.pe.core.ProcessStarter.setState(Unknown Source)
                at com.tibco.pe.core.JobPool.if(Unknown Source)
                at com.tibco.pe.core.finishStartup.itsTime(Unknown Source)
                at com.tibco.pe.util.ReminderQueue.run(Unknown Source)
caused by: java.lang.VerifyError: class com.tibco.bw.service.binding.bwhttp.tomcat.TomcatRepoRealm overrides final method start.()V
                at java.lang.ClassLoader.defineClass1(Native Method)
                at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
                at java.lang.ClassLoader.defineClass(ClassLoader.java:615)

Cause:
This is caused by a conflict between BE 5.1 and BW 5.10 Tomcat libraries.