[jbossseam-issues] [JBoss JIRA] Created: (JBSEAM-1023) Looking up a filtered SMPC in non-faces servlet throws NPE

Christian Bauer (JIRA) jira-events at lists.jboss.org
Sat Mar 10 14:56:46 EST 2007


Looking up a filtered SMPC in non-faces servlet throws NPE
----------------------------------------------------------

                 Key: JBSEAM-1023
                 URL: http://jira.jboss.com/jira/browse/JBSEAM-1023
             Project: JBoss Seam
          Issue Type: Bug
          Components: Core
            Reporter: Christian Bauer
            Priority: Minor


My servlet does:

                EntityManager em = ((EntityManager)org.jboss.seam.Component.getInstance("entityManager"));
                em.joinTransaction();

                file = (!"".equals(id)) ? em.find(File.class, Long.parseLong(id)) : null;

This worked OK, but after I enabled this filter:

    <core:filter name="accessLevelFilter">
        <core:name>accessLevelFilter</core:name>
        <core:parameters>
            <key>currentAccessLevel</key>
            <value>#{currentAccessLevel}</value>
        </core:parameters>
    </core:filter>

    <core:managed-persistence-context name="entityManager"
                                      auto-create="true"
                                      entity-manager-factory="#{wikiEntityManagerFactory}">
        <core:filters><value>#{accessLevelFilter}</value></core:filters>
    </core:managed-persistence-context>

It fails with:

Caused by: java.lang.NullPointerException: facesContext
        at org.apache.myfaces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:379)
        at org.jboss.seam.core.Expressions$1.getValue(Expressions.java:57)
        at org.jboss.seam.persistence.HibernatePersistenceProvider.enableFilter(HibernatePersistenceProvider.java:60)
        at org.jboss.seam.core.ManagedPersistenceContext.initEntityManager(ManagedPersistenceContext.java:85)
        at org.jboss.seam.core.ManagedPersistenceContext.getEntityManager(ManagedPersistenceContext.java:105)
        at sun.reflect.GeneratedMethodAccessor1775.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.jboss.seam.util.Reflections.invoke(Reflections.java:18)
        at org.jboss.seam.util.Reflections.invokeAndWrap(Reflections.java:121)
        at org.jboss.seam.Component.callComponentMethod(Component.java:1834)
        at org.jboss.seam.Component.unwrap(Component.java:1860)
        at org.jboss.seam.Component.getInstance(Component.java:1657)
        at org.jboss.seam.Component.getInstance(Component.java:1610)
        at org.jboss.seam.Component.getInstance(Component.java:1604)
        at org.jboss.seam.wiki.core.ui.FileServlet.doGet(FileServlet.java:70)

The expression "#{currentAccessLevel}" can either be resolved to a variable in the SESSION context or to a factory method on one of my components.


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