问题
I am using tomcat connection pool, jpa, hibernate. The datasource i created in context.xml of tomcat works fine if I try to get it using :
source = (DataSource) ((Context) c.lookup("java:comp/env")).lookup("jdbc/kids");
but if i specify this jndi datasource in persistence.xml
<persistence-unit name="kids-tomcat" transaction-type="JTA">
<jta-data-source>jdbc/kids</jta-data-source>
</persistence-unit>
I am getting following exception: org.hibernate.service.jndi.JndiException: Unable to lookup JNDI name [jdbc/kids]
Any idea why it could happen !
回答1:
Finally it worked today after i specified the properties below.. because just mentioning the datasource is not enough; we need to specify some properties like which dialect to use. If we specify datasource; we need not specify username , password url of the database ( as all are specified in the datasource configuration itself) .
Most important point is the way you specify the datasource. It should be complete path: java:/comp/env/jdbc/kids . All this while I was missing the slash just before comp.
<persistence-unit name="kids" transaction-type="RESOURCE_LOCAL">
<non-jta-data-source>java:/comp/env/jdbc/kids</non-jta-data-source>
<class>com.kids.domain.User</class>
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5InnoDBDialect"/>
<property name="connection.autocommit" value="false"/>
<property name="hibernate.hbm2ddl.auto" value="create"/>
<property name="hibernate.show_sql" value="true"/>
</properties>
</persistence-unit>
回答2:
Maybe try the persistence.xml JNDI defined name including both the namespace ("java:comp/env") as well as the JNDI path ("jdbc/kids") in a single-string (i.e put them together).
来源:https://stackoverflow.com/questions/10233441/jndi-lookup-works-fine-using-lookup-but-not-when-used-in-persistence-xml-of-jpa