[jbossseam-issues] [JBoss JIRA] Commented: (JBSEAM-1023) Looking up a filtered SMPC in non-faces servlet throws NPE
[ http://jira.jboss.com/jira/browse/JBSEAM-1023?page=comments#action_12356483 ]
Christian Bauer commented on JBSEAM-1023:
-----------------------------------------
This is apparently related to the fact that #{currentAccessLevel} is supposed to resolve
against a @Factory method:
/**
* Assigns the context variable 'currentAccessLevel' when no user is logged
in.
* @return Integer Guest access level.
*/
@Factory(value = "currentAccessLevel", scope = ScopeType.SESSION, autoCreate
= true)
public Integer getGuestAccessLevel() {
return ((Role)Component.getInstance("guestRole")).getAccessLevel();
}
If I trigger this factory method before I obtain the entityManager, it works:
// Trigger the factory
org.jboss.seam.Component.getInstance("currentAccessLevel")
EntityManager em =
((EntityManager)org.jboss.seam.Component.getInstance("entityManager"));
em.joinTransaction();
file = (!"".equals(id)) ? em.find(File.class, Long.parseLong(id)) : null;
...
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
Assigned To: Gavin King
Priority: Minor
Fix For: 1.2.1.GA
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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