Servlet exception + class exception + Glassfish + Netbeans + JPA Entities + Vaadin exception

Question

I get this error:

StandardWrapperValve [Vaadin Servlet]: PWC1406: Servlet.service () for the servlet. Vaadin Servlet throws a java.lang.ClassCastException exception: com.delhi.entities.Category cannot be attributed to com.delhi.entities.Category

when I try to run my webapps on Glassfish v2.

Category - JPA Entity Object

violation code according to server log:

for (Category c : categories) {
          mymethod();
   }

Categories

sourced from:

List<Category> categories = q.getResultList();

Any idea what went wrong?

Answer 1

. , . , WAR . :

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• EAR. , JAR, EAR MANIFEST.MF.

Answer 2

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• undeploy deploy
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Answer 3

Glassfish v2 Glassfish v3.

: - persistence ( , )?

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HashMap<Object, Object> properties = new HashMap<Object, Object>();
properties.put(PersistenceUnitProperties.CLASSLOADER, this.getClass().getClassLoader());
entityManagerFactory = Persistence.createEntityManagerFactory(jpaContext, properties);

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Answer 4

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• Glassfish v4
• Netbeans
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, [x] > . , , save. PermGen () EAR ( , , EAR - "" Netbeans ).

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SEVERE:   The web application [/faces] created a ThreadLocal with key of type [org.glassfish.pfl.dynamic.codegen.impl.CurrentClassLoader$1] (value [org.glassfish.pfl.dynamic.codegen.impl.CurrentClassLoader$1@249ea63a]) and a value of type [org.glassfish.web.loader.WebappClassLoader] (value [WebappClassLoader (delegate=true; repositories=WEB-INF/classes/)]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.

Answer 5

I had the same problem today. The solution closed EntityManagerFactory after use.
This answer helped me: fooobar.com/questions/1451599 / ...