I have a general concept of a TreeNode which could contain a parent (another
TreeNode) and some children, a Collection of TreeNodes. So I have defined a
basic TreeNode such as:
public class TreeNode ... {
public void setParent(TreeNode parent) throws RemoteException;
public TreeNode getParent() throws RemoteException;
public void setChildren(Collection children) throws RemoteException;
public Collection getChildren() throws RemoteException;
}
My TreeNodeBean, has the appropriate abstract functions.
Now, I have something called Category, which has a parent/children
relationship with other categories. So, when creating a Category, I defined
it like this:
public interface Category extends TreeNode {
public String getName() throws RemoteException;
public void setName(String string) throws RemoteException
}
similary, I defined a CategoryBean as an abstract class which is based on
TreeNodeBean, with the additional abstract functions to get/set name. I
have created a one-to-many relationship between Categories, using parent to
specify the parent for particular category, and children to indicate the
children Collection.
When I try to deploy the Category bean, I get the following exception from
Orion during deployment:
Auto-deploying model (ejb-jar.xml had been touched since the previous
deployment)... java.lang.NullPointerException
at com.evermind.server.ejb.deployment.ContainerManagedField.aep(JAX)
at com.evermind.server.ejb.database.fj.afk(JAX)
at com.evermind.server.ejb.compilation.gf.ah9(JAX)
at com.evermind.server.ejb.compilation.f9.ah9(JAX)
at com.evermind.server.ejb.compilation.f9.s7(JAX)
at com.evermind.server.ejb.compilation.gf.s7(JAX)
at com.evermind.server.ejb.EJBContainer.b_(JAX)
at com.evermind.server.Application.b_(JAX)
at com.evermind.server.Application.gj(JAX)
at com.evermind.server.ApplicationServer.r2(JAX)
at com.evermind.server.ApplicationServer.aq0(JAX)
at com.evermind.server.ApplicationServer.gj(JAX)
at com.evermind.server.hk.run(JAX)
at java.lang.Thread.run(Thread.java:484)
at com.evermind.util.f.run(JAX)
Is this normal? What does this exception mean?
Thanks.
-AP_
