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POStrange classCastException hibernate 3.5 glassfish
 

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    <p>Hi I have a problem that I can't solve on my own. I have a war file packaged in ear and running on glassfish 3.0.1 with hibernate 3.5 as JPA provider. I compile it with maven and deploy it with idea or manually. Every other time I get a cast exception in my DAOs:</p> <pre><code>java.lang.ClassCastException: com.myproject.domain.entity.User cannot be cast to com.myproject.domain.entity.User </code></pre> <p>Other times it works perfectly fine. There is no pattern in this behaviour. Could someone shine some light on what is happening here?</p> <p>Example method where the exception was thrown at com.myproject.domain.dao.UserDAOImpl.checkUserSessionValid(UserDAOImpl.java:195) </p> <pre><code>public User checkUserSessionValid(String sessionId) { User user = null; EntityManager em = provider.entityManager(); try { em.getTransaction().begin(); //Query q = em.createQuery("SELECT u FROM User u WHERE u.session.sessionId = :sessionId"); makes no difference :/ Query q = em.createQuery("SELECT u FROM User u WHERE u.session.sessionId = :sessionId",User.class); q.setParameter("sessionId", sessionId); user = (User) q.getSingleResult(); em.getTransaction().commit(); } catch (NoResultException ignored) { } finally { em.close(); } return user; } My libraries [INFO] +- org.apache.geronimo.specs:geronimo-jpa_2.0_spec:jar:1.0:provided [INFO] +- javax.validation:validation-api:jar:1.0.0.GA:compile [INFO] +- org.hibernate:hibernate-annotations:jar:3.5.1-Final:compile [INFO] | +- org.hibernate:hibernate-core:jar:3.5.1-Final:compile [INFO] | | +- antlr:antlr:jar:2.7.6:compile [INFO] | | +- commons-collections:commons-collections:jar:3.2.1:compile [INFO] | | +- dom4j:dom4j:jar:1.6.1:compile [INFO] | | | \- xml-apis:xml-apis:jar:1.0.b2:compile [INFO] | | \- javax.transaction:jta:jar:1.1:provided (scope managed from compile) [INFO] | +- org.hibernate:hibernate-commons-annotations:jar:3.2.0.Final:compile [INFO] | +- org.hibernate.javax.persistence:hibernate-jpa-2.0-api:jar:1.0.0.Final:compile [INFO] | \- org.slf4j:slf4j-api:jar:1.5.2:compile [INFO] +- org.hibernate:hibernate-entitymanager:jar:3.5.1-Final:compile [INFO] | +- cglib:cglib:jar:2.2:compile [INFO] | | \- asm:asm:jar:3.1:compile [INFO] | \- javassist:javassist:jar:3.9.0.GA:compile [INFO] +- org.hibernate:hibernate-validator:jar:4.1.0.Final:compile [INFO] +- org.slf4j:slf4j-simple:jar:1.5.2:test [INFO] +- mysql:mysql-connector-java:jar:5.1.13:test [INFO] +- org.hsqldb:hsqldb:jar:2.0.0:test </code></pre>
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    1. COHad the same error with a different configuration: Glassfish 3.0.1, EclipseLink, Netbeans/Ant-Deployment. Restarting the server always helped. But it's annoying (GF restart can take a long time). Would like to know the solution (MeTOO-comment :-)
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    2. COCan be that the jar with com.myproject.domain.entity.User located in multiple locations? Glassfish lib folder? Domain lib folder? Multiple wars? Lib under ear? It would be really helpful if you specify all this locations... Also when Hibernate is located?
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