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Hi Vamsi,
I
believe that particular error message occurs when you try to load an entity bean
but your primary key is set to null. I don't know exactly why your primary
key is null though.
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>
<!-- Write a file named ejb-finders-EmployeeBean.xml if you
want to define extra finders. -->
</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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