javax.naming.NameNotFoundException:在尝试查找comp/env/UserTransaction时

在weblogic 12上部署应用程序时，我面临以下异常

weblogic.application.ModuleException： javax.naming.NameNotFoundException:尝试查找时 comp/env/UserTransaction in/app/webapp/Demo 人工制品。战争/895045661。；剩余名称“comp/env/UserTransaction”

我的spring-jpa.xml如下

<jee:jndi-lookup id="userTransaction" jndi-name="java:comp/env/UserTransaction" resource-ref="true" cache="true"/>

<?xml version="1.0" encoding="UTF-8"?>
<Context path="/private/tool" sessionCookieName="JSESSIONID_TOOL" disableURLRewriting="true">
    <Resource name="UserTransaction" auth="Container" type="javax.transaction.UserTransaction" factory="org.objectweb.jotm.UserTransactionFactory" jotm.timeout="60"/>
</Context>

xml如下所示

<jee:jndi-lookup id="userTransaction" jndi-name="java:comp/env/UserTransaction" resource-ref="true" cache="true"/>

<?xml version="1.0" encoding="UTF-8"?>
<Context path="/private/tool" sessionCookieName="JSESSIONID_TOOL" disableURLRewriting="true">
    <Resource name="UserTransaction" auth="Container" type="javax.transaction.UserTransaction" factory="org.objectweb.jotm.UserTransactionFactory" jotm.timeout="60"/>
</Context>

如何在weblogic中配置UserTransaction？为什么我的应用程序无法查找comp/env/UserTransaction