[JBoss-user] Attempt to get lock ref with a null object

Vamsi Sarma Wed, 21 Apr 2004 23:24:48 -0700

Hi sesques,
Thanks for ur interest on me.
Here i am posting
I have created a simple cmp , with 3 fields empId, empFirstname,empLastName.
Here empId is primary key with autoincrement.
When i enter Emp first name, last name using the create method my cmp is working fine and i am able to create new row with autoincrement.
When i call setEmpFirstName() or serEmpLastName() methods from my client geeting an error given below

java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
[java] java.rmi.ServerException: RuntimeException; nested exception is:
[java] java.lang.IllegalArgumentException: Attempt to get lock ref with a null object
[java] at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:292)
[java] at sun.rmi.transport.Transport$1.run(Transport.java:148)
[java] at java.security.AccessController.doPrivileged(Native Method)
[java] at sun.rmi.transport.Transport.serviceCall(Transport.java:144)
[java] at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
[java] at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
[java] at java.lang.Thread.run(Thread.java:534)
.....21

ejb-jar.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN" "http://java.sun.com/dtd/ejb-jar_2_0.dtd">

<ejb-jar >
   <description>[CDATA[No Description.]]</description>
   <display-name>Generated by XDoclet</display-name>
   <enterprise-beans>

      <entity >
         <description>[CDATA[]]</description>
         <ejb-name>Employee</ejb-name>
         <home>com.emp.empdata.EmployeeHome</home>
         <remote>com.emp.empdata.Employee</remote>
         <local-home>com.emp.empdata.EmployeeLocalHome</local-home>
         <local>com.emp.empdata.EmployeeLocal</local>
         <ejb-class>com.emp.empdata.EmployeeCMP</ejb-class>
         <persistence-type>Container</persistence-type>
         <prim-key-class>java.lang.Integer</prim-key-class>
         <reentrant>False</reentrant>
         <cmp-version>2.x</cmp-version>
         <abstract-schema-name>mytestSchema</abstract-schema-name>
         <cmp-field >
            <description>[CDATA[Returns the id]]</description>
            <field-name>id</field-name>
         </cmp-field>
         <cmp-field >
            <description>[CDATA[Returns the empFirstName]]</description>
            <field-name>empFirstName</field-name>
         </cmp-field>
         <cmp-field >
            <description>[CDATA[Returns the empLastName]]</description>
            <field-name>empLastName</field-name>
         </cmp-field>
         <primkey-field>id</primkey-field>
          <security-identity><use-caller-identity/></security-identity>
      
      </entity>
   </enterprise-beans>

    <assembly-descriptor >
       <security-role>
            <role-name>every onene</role-name>
        </security-role>
   <method-permission>
            <role-name>every one</role-name>
            <method>
                <ejb-name>Employee</ejb-name>
                <method-name>*</method-name>
           </method>
      </method-permission>
   <container-transaction>
             <method>
                <ejb-name>Employee</ejb-name>
                <method-name>*</method-name>
           </method>
      <trans-attribute>Required</trans-attribute>
        </container-transaction>
</assembly-descriptor>
</ejb-jar>

jbosscmp-jdbc.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE jbosscmp-jdbc PUBLIC
   "-//JBoss//DTD JBOSSCMP-JDBC 3.2//EN"
   "http://www.jboss.org/j2ee/dtd/jbosscmp-jdbc_3_2.dtd">

<jbosscmp-jdbc>
   <defaults>
      <datasource>java:/MySqlDS</datasource>
      <datasource-mapping>mySQL</datasource-mapping>
      <create-table>true</create-table>
      <remove-table>true</remove-table>
   </defaults>
   <enterprise-beans>

      <entity>
         <ejb-name>Employee</ejb-name>
         <cmp-field>
            <field-name>id</field-name>
            <column-name>emp_id</column-name>
         <jdbc-type>INTEGER</jdbc-type>
        <sql-type>INTEGER</sql-type>
        <auto-increment></auto-increment>
        </cmp-field>
         <cmp-field>
            <field-name>empFirstName</field-name>
            <column-name>emp_firstname</column-name>
         <jdbc-type>VARCHAR</jdbc-type>
        <sql-type>VARCHAR(25)</sql-type>
        </cmp-field>
         <cmp-field>
            <field-name>empLastName</field-name>
            <column-name>emp_lastname</column-name>
         <jdbc-type>VARCHAR</jdbc-type>
        <sql-type>VARCHAR(25)</sql-type>
        </cmp-field>
      </entity>
   </enterprise-beans>
</jbosscmp-jdbc>

please let me know the reason.

please tell me what is the exact problem
vamsi

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[JBoss-user] Attempt to get lock ref with a null object

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