I've never run Apache Tomcat with WTP, but I'm curious what the nested 
exception says?

> 
> if we right click on the project, go to "Run As" and click on "Run on Server" 
> using "Tomcat v8.5 Server" server the Console show this error: 
> org.apache.openejb.OpenEJBRuntimeException: <openjpa-2.4.1-r422266:1730418 
> fatal general error> org.apache.openjpa.persistence.PersistenceException: 
> There was an error when invoking the static newInstance method on the named 
> factory class "org.apache.openjpa.jdbc.kernel.JDBCBrokerFactory".  See the 
> nested exception for details.: <openjpa-2.4.1-r422266:1730418 fatal general 
> error> org.apache.openjpa.persistence.PersistenceException: There was an 
> error when invoking the static newInstance method on the named factory class 
> "org.apache.openjpa.jdbc.kernel.JDBCBrokerFactory".  See the nested exception 
> for details.
Looking at your example project, you don't seem to have any Eclipse metadata 
(.project, .settings/*).

Can you compare the published module used when launching (should be somewhere 
in …/.metadata/.plugins/org.eclipse.wst.server.core) vs the exported war?

Brian.
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