Cayenne -- Apache re-deploy problem -- NullPointerException

From: Marc Gabriel-Willem (marc.gabriel-wille..ide-international.com)
Date: Tue Mar 13 2007 - 06:20:42 EDT

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    Hi,

     

    I'm using Cayenne (2.0.2) with the apache web server (5.5.20) and I'm
    facing to the following problem.

     

    When apache does an automatic deploy, all objects are serialized /
    deserialized without any error.

    But after that, when the code accesses a cayenne persistent object
    (member variable of a jsf backing bean), the following problem occurs:

     

    Caused by: java.lang.NullPointerException

            at
    org.apache.cayenne.access.DataContextQueryAction.interceptPaginatedQuery
    (DataContextQueryAction.java:91)

            at
    org.apache.cayenne.access.DataContextQueryAction.execute(DataContextQuer
    yAction.java:50)

            at
    org.apache.cayenne.access.DataContext.onQuery(DataContext.java:1387)

            at
    org.apache.cayenne.access.DataContext.performQuery(DataContext.java:1376
    )

            at
    org.apache.cayenne.access.ToManyList.resolvedObjectList(ToManyList.java:
    307)

            at
    org.apache.cayenne.access.ToManyList.size(ToManyList.java:260)

            at
    com.sideinternational.web.profiling.group.GroupEditor.save(GroupEditor.j
    ava:246)

            at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

            at
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav
    a:39)

            at
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor
    Impl.java:25)

            at java.lang.reflect.Method.invoke(Method.java:585)

            at
    org.apache.myfaces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:13
    2)

     

    For information, the following code throws that exception (the call to
    the size() method) :

    List itemsToRemove = m_editableGroup.getGroupContentArray();

          for (int i=0; i < itemsToRemove.size(); i++)

                ...

    Note: Child data context and ObjectEntities are stored in a serializable
    jsf backing bean.

     

    Thank you for your help.

     

    Marc Gabriel

     

     

     

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