JNDI lookup works fine using lookUp but not when used in persistence.xml of JPA

别说谁变了你拦得住时间么 提交于 2019-12-12 08:23:43

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

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