ClassNotFoundException error when configuring JIRA in Websphere
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Problem
Running JIRA on Websphere fails with error:
java.lang.ClassNotFoundException: class com.atlassian.jira.security.auth.trustedapps.TrustedApplicationFilter :java.lang.NullPointerException
Cause
The WEB-INF/classes/entityengine.xml is not compliant (well-formed) XML. WebSphere does not display error messages about the XML not being well-formed. Instead it displays the spurious error message above.
Workaround
Ensure that The WEB-INF/classes/entityengine.xml is well-formed and valid. Test entityengine.xml by opening it in Internet Explorer or Firefox.
Resolution
Use Tomcat Application Server which is part of JIRA's Supported Platforms