NullPointerException from jboss while loading a CMR

[ittay]

this is the stack trace, not much more i can say, because there is not specific scenario in which this happens.

java.lang.NullPointerException
at org.jboss.ejb.plugins.cmp.jdbc.bridge.JDBCCMP2xFieldBridge.getFieldState(JDBCCMP2xFieldBridge.java:124)
at org.jboss.ejb.plugins.cmp.jdbc.bridge.JDBCCMP2xFieldBridge.setInstanceValue(JDBCCMP2xFieldBridge.java:221)
at org.jboss.ejb.plugins.cmp.jdbc.bridge.JDBCCMP2xFieldBridge.setInstanceValue(JDBCCMP2xFieldBridge.java:159)
at org.jboss.ejb.plugins.cmp.jdbc.bridge.JDBCAbstractCMPFieldBridge.loadInstanceResults(JDBCAbstractCMPFieldBridge.java:325)
at org.jboss.ejb.plugins.cmp.jdbc.JDBCLoadEntityCommand.execute(JDBCLoadEntityCommand.java:190)
at org.jboss.ejb.plugins.cmp.jdbc.JDBCLoadEntityCommand.execute(JDBCLoadEntityCommand.java:83)
at org.jboss.ejb.plugins.cmp.jdbc.JDBCStoreManager.loadEntity(JDBCStoreManager.java:632)
at org.jboss.ejb.plugins.cmp.jdbc.bridge.JDBCCMRFieldBridge.getInstanceValue(JDBCCMRFieldBridge.java:565)
at org.jboss.ejb.plugins.cmp.jdbc.bridge.JDBCCMRFieldBridge.getValue(JDBCCMRFieldBridge.java:508)
at org.jboss.ejb.plugins.cmp.bridge.EntityBridgeInvocationHandler.invoke(EntityBridgeInvocationHandler.java:124)
at org.jboss.proxy.compiler.Runtime.invoke(Runtime.java:59)
at com.qlusters.qrm.server.model.virtualserver.ejb.VirtualServerStatisticsCMP$Proxy.getState()

[triathlon98]

This can typically occur when you are trying to access a field of primitive type (int, double) when there are null values in the database. As this can't be represented at the CMP level, you run into problems.

A possible solution is to define your fields as Integer or Double.

Joachim

[rag]

Dear friend,
whenever you are deploying an entity bean that has referntial integrity at database level (primary key-foreignkey relationship) see that you have defined both Home, Localhome & Remote, Local Component interfaces in both the entity bean.
and make sure that they are mentioned in the ejb-jar.xml
like this:
<ejb-class>taxentitybean.TaxEJB</ejb-class>
taxentitybean.TaxHome
taxentitybean.Tax
<persistence-type>Container</persistence-type>
<prim-key-class>java.lang.String</prim-key-class>
with regards
Akhil

[ittay]

can you explain why i should put the home and interface in the <ejb-class> section?

do you know how i can do it with xdoclet?

thanx,
ittay