Jimmy dong [http://community.jboss.org/people/jimmy.dongjia] created the discussion "Help! The problem of replacing the h2 DB to mysql" To view the discussion, visit: http://community.jboss.org/message/641059#641059 -------------------------------------------------------------- I replace hibernate.cfg.xml in jbpm-gwt-console-server-war/WEB-INF/classes/META-INF  and   jbpm-gwt-console-server-war/WEB-INF/classes; I replace persistence.xml in jbpm-gwt-console-server-war/WEB-INF/classes/META-INF. I replace testDS1-ds.xml /usr/local/jbpm-installer/jboss-5.1.0.GA/server/default/deploy. I replace hibernate.cfg.xml in jbpm-gwt-console-server.war/lib/jbpm-bam-5.1.0.Final.jar, and in runtime/lib/jbpm-bam-5.1.0.Final.jar I replace persistance.xml in jbpm-gwt-console-server.war/lib/jbpm-human-task-5.1.0.Final.jar ,and in runtime/lib/jbpm-human-task-5.1.0.Final.jar Finally,I put the driver jar of mysql(mysql-connector-java-5.1.18-bin.jar) to db/driver. But,after jboss run, the human task service can't run: [java] Exception in thread "main" javax.persistence.PersistenceException: Unable to configure EntityManagerFactory      [java]  at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:265)      [java]  at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:125)      [java]  at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:52)      [java]  at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:34)      [java]  at org.jbpm.DemoTaskService.main(Unknown Source)      [java] Caused by: org.xml.sax.SAXParseException: The reference to entity "characterEncoding" must end with the ';' delimiter.      [java]  at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:249)      [java]  at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:284)      [java]  at org.hibernate.ejb.packaging.PersistenceXmlLoader.loadURL(PersistenceXmlLoader.java:70)      [java]  at org.hibernate.ejb.packaging.PersistenceXmlLoader.deploy(PersistenceXmlLoader.java:89)      [java]  at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:222)      [java]  ... 4 more      [java] Java Result: 1 BUILD SUCCESSFUL Total time: 3 seconds -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/641059#641059] Start a new discussion in jBPM at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]