[jboss-user] [Beginner's Corner] - Re: javax.ejb.EJBException: javax.persistence.TransactionRequiredException

<?xml version="1.0" encoding="UTF-8" standalone="yes"?> <datasources>         <xa-datasource>                 <xa-datasource-class>org.postgresql.xa.PGXADataSource</xa-datasource-class>                 <xa-resource-timeout>0</xa-resource-timeout>                 <xa-datasource-property name="ServerName">localhost</xa-datasource-property>                 <xa-datasource-property name="DatabaseName">mydb</xa-datasource-property>                 <xa-datasource-property name="User">mydb</xa-datasource-property>                 <xa-datasource-property name="Password">mydb</xa-datasource-property>                 <track-connection-by-tx/>                 <no-tx-separate-pools/>                 <jndi-name>MyDS</jndi-name>                 <use-java-context>true</use-java-context>                 <transaction-isolation>TRANSACTION_READ_COMMITTED</transaction-isolation>                 <check-valid-connection-sql>select 1</check-valid-connection-sql>                 <metadata>                         <type-mapping>PostgreSQL 8.0</type-mapping>                 </metadata>                 <min-pool-size>8</min-pool-size>                 <max-pool-size>32</max-pool-size>                 <idle-timeout-minutes>30</idle-timeout-minutes>                 <prefill>true</prefill>         </xa-datasource> </datasources>