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Asked: 2026-06-05T11:48:11+00:00

Glassfish is not loading the com.mysql.jdbc.jdbc2.optional.MysqlXADataSource package. The following error is thrown javax.persistence.PersistenceException: Exception

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Glassfish is not loading the com.mysql.jdbc.jdbc2.optional.MysqlXADataSource package.

The following error is thrown

javax.persistence.PersistenceException: Exception [EclipseLink-4002] (Eclipse Persistence
Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLException: 
Error in allocating a connection. Cause: Class name is wrong or classpath is not set    
for:com.mysql.jdbc.jdbc2.optional.MysqlXADataSource
Error Code: 0 at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy
(EntityManagerSetupImpl.java:517)...

I have copied the mysql-connector jar file to the lib directory of Glassfish but I still get the above error.

How do I ensure that Glassfish can find my JDBC driver for my deployed application?

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1 Answer

  1. Editorial Team

    You will need to make the MySQL JDBC jar file available to Glassfish.

    http://ushainformatique.com/blog/2010/03/19/jdbcwithglassfish/

    EDIT:

    How do I use different JDBC drivers? Where should I copy the jar(s)?

    It is recommended to place JDBC drivers, that are used by all the
    applications in the domain, in domain-dir/lib or
    domain-dir/lib/classes. A restart of the application server instance
    is required today so that the JDBC drivers are visible to applications
    deployed in the domain.

    From https://blogs.oracle.com/sivakumart/entry/classloaders_in_glassfish_an_attempt

    So move the jar file into the lib dir below the domain into which you are deploying your app. The default Glassfish domain is domain1.

    Restart Glassfish and this should work.

    There is a Maven Glassfish plugin which may be worth evaluating http://maven-glassfish-plugin.java.net/ Using Maven and this plugin would help automate the deployment step. This would be more robust than doing manual deployments. Your call though of course.

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