Hi, All.
I am quite confused that even simple EJBQL
examples are not working.
Can someone please help me?
I can as well post the code, but its based on the
standard Gangster example, all infos below.
Problem:
(JBoss 3.2.1-tomcat, CMP Gangster Example of 3.2.1 Documentation)
I try to use a simple CMP field in an EJB query, and I get a
"org.jboss.deployment.DeploymentException: Error compiling EJB-QL statement
'SELECT OBJECT(u) FROM gangster u WHERE u.bestFriend = ?1';
- nested throwable: (java.lang.NullPointerException)"
Is it not possible to use CMP fields in EJB queries?
I did this as close to the JBoss 3.2.1 documentation as possible:
1) added setter/getter for 'bestFriend' to bean,
2) added declarations to local interface,
3) added finderdeclaration to local home
4) added CMP-field and query-definition of finder to ejb-jar.xml
My query is SELECT OBJECT(u) FROM gangster u WHERE u.bestFriend = ?1
and I get the Error compiling EJB-QL statement error.
What do I wrong?
Details:
-------
I add the getter and setter for a new field bestFriend to the GansterBean.java:
//new:
public abstract Gangster getBestFriend();
public abstract void setBestFriend(Gangster u);
I add them to the local interface Gangster.java:
//new:
Gangster getBestFriend();
void setBestFriend(Gangster u);
I add the CMP-field definition to ejb-jar.xml:
<cmp-field>
<field-name>bestFriend</field-name>
</cmp-field>
I add a new finder to the ejb-jar.xml:
<query-method>
<method-name>findBestFriend2</method-name>
<method-params>
<method-param>org.jboss.cmp2.crimeportal.Gangster</method-param>
</method-params>
</query-method>
<ejb-ql>[CDATA[
SELECT OBJECT(u) FROM gangster u WHERE u.bestFriend = ?1
]]</ejb-ql>
I add the corresponding declaration to the local home interface GanagsterHome.java:
//new:
Collection findBestFriend2(Gangster g) throws FinderException;
