Enhance class for JPA Entity

The first warning doesn't seem to be relevant, the second one is caused by a missed dependency, looks like you don't have commons-lang in the classpath: http://stackoverflow.com/a/16152733/104891.

commons-lang-2.4 is in WEB-INF\lib

It compiles if I dont include the javaagent agent option, but I read that I need the java agent option to avoid this error on the debug console:

<openjpa-2.4.0-r422266:1674604 nonfatal user error> org.apache.openjpa.persistence.ArgumentException: This configuration disallows runtime optimization, but the following listed types were not enhanced at build time or at class load time with a javaagent: "
com.fh.SamEntity".

Which is generated on the EntityManager and EntityTransaction lines

ublic class harness {
    static void testHarness(SamEntity sam1) {
        EntityManagerFactory emf = Persistence.createEntityManagerFactory("samDB");
        EntityManager em = emf.createEntityManager();
        EntityTransaction tx = em.getTransaction();
        tx.begin();

On the actual console itself I get:

846  samDB  WARN   [http-nio-8080-exec-5] openjpa.jdbc.Schema - Existing column "Unborn" on table "sys.sam" is incompatible with the same column in the given schema definition. Existing column:
Full Name: sam.Born
Type: varchar
Size: 45
Default: null
Not Null: false
Given column:
Full Name: sam.Born
Type: varchar
Size: 255
Default: null
Not Null: false

852  samDB  WARN   [http-nio-8080-exec-5] openjpa.jdbc.Schema - Existing column "Weapon" on table "sys.sam" is incompatible with the same column in the given schema definition. Existing column:
Full Name: sam.WeaponType
Type: varchar
Size: 50
Default: null
Not Null: false
Given column:
Full Name: sam.WeaponType
Type: varchar
Size: 255
Default: null
Not Null: false

881  samDB  TRACE  [http-nio-8080-exec-5] openjpa.Runtime - Found datasource1: datasource 1321016407 from configuration. StoreContext: org.apache.openjpa.kernel.FinalizingBrokerImpl@1f65ebe3
C:\Users\AlGrant\Documents\apache-tomcat-8.5.4\bin\catalina.bat stop
Using CATALINA_BASE:   "C:\Users\AlGrant\.IntelliJIdea2016.3\system\tomcat\Unnamed_cmfhapp"
Using CATALINA_HOME:   "C:\Users\AlGrant\Documents\apache-tomcat-8.5.4"
Using CATALINA_TMPDIR: "C:\Users\AlGrant\Documents\apache-tomcat-8.5.4\temp"
Using JRE_HOME:        "C:\Program Files\Java\jdk1.8.0_101"
Using CLASSPATH:       "C:\Users\AlGrant\Documents\apache-tomcat-8.5.4\bin\bootstrap.jar;C:\Users\AlGrant\Documents\apache-tomcat-8.5.4\bin\tomcat-juli.jar"
14-Mar-2017 16:43:43.532 INFO [main] org.apache.catalina.core.StandardServer.await A valid shutdown command was received via the shutdown port. Stopping the Server instance.
14-Mar-2017 16:43:43.533 INFO [main] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["http-nio-8080"]
14-Mar-2017 16:43:43.584 INFO [main] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["ajp-nio-8009"]
14-Mar-2017 16:43:43.635 INFO [main] org.apache.catalina.core.StandardService.stopInternal Stopping service Catalina
14-Mar-2017 16:43:43.648 WARNING [localhost-startStop-2] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesJdbc The web application [cmfhapp-1.0-SNAPSHOT] registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
14-Mar-2017 16:43:43.649 WARNING [localhost-startStop-2] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [cmfhapp-1.0-SNAPSHOT] appears to have started a thread named [Abandoned connection cleanup thread] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
 java.lang.Object.wait(Native Method)
 java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
 com.mysql.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:43)
14-Mar-2017 16:43:43.659 INFO [main] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["http-nio-8080"]
14-Mar-2017 16:43:43.661 INFO [main] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["ajp-nio-8009"]
14-Mar-2017 16:43:43.661 INFO [main] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["http-nio-8080"]
14-Mar-2017 16:43:43.662 INFO [main] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["ajp-nio-8009"]
Disconnected from server

Does this help? Thanks Serge.

So, what's the actual error? Does it prevent your app from working?

Well yes. Nothing ends up in the database....and if I put a println statement here :

public class harness {
    static void testHarness(SamEntity sam1) {
        EntityManagerFactory emf = Persistence.createEntityManagerFactory("samDB");
        EntityManager em = emf.createEntityManager();
        EntityTransaction tx = em.getTransaction();
        tx.begin();

        em.persist(sam1);
        tx.commit();
        System.out.println("Here");
        em.close();

    }
}

The "Here" statement is never hit - despite all the output from the attempt to write to the Db.

Please share the project to reproduce the problem: https://intellij-support.jetbrains.com/hc/articles/206869619.