JBoss 7 throwing Entity is not mapped when using @PersistenceContext

Question

I'm using Spring/JPA/Hibernate 3 in an application that runs just fine in Tomcat 7 but fails in JBoss AS 7. I'm using the @PersistenceContext annotation to inject my entity manager in the DAOs but I get the "Entity is not mapped" exception when running a query. I DO NOT want JBoss to manage my persistence context and I'm using classpath scanning to construct my LocalContainerEntityManagerFactoryBean. I've tried disabling the jpa module from the JBoss standalone.xml and even adding a jboss-deployment-structure.xml with this content:

<jboss-deployment-structure xmlns="urn:jboss:deployment-structure:1.0">
    <deployment>
        <exclusions>
            <module name="org.hibernate"/>
        </exclusions>
    </deployment>
</jboss-deployment-structure>

It still doesn't work. What's the cause of this exception? Why does JBoss still try to manage my persistence context?

P.S.: By default I get a strange PU definition (the PU root url is not my war!)

(MSC service thread 1-3) insurance-module 17:51:41.456 [MSC service thread 1-3] DEBUG org.hibernate.ejb.Ejb3Configuration - Processing PersistenceUnitInfo [
17:51:41,456 INFO  [stdout] (MSC service thread 1-3)    name: default
17:51:41,456 INFO  [stdout] (MSC service thread 1-3)    persistence provider classname: null
17:51:41,456 INFO  [stdout] (MSC service thread 1-3)    classloader: ModuleClassLoader for Module "deployment.insurance-module-0.1-SNAPSHOT.war:main" from Service Module Loader
17:51:41,457 INFO  [stdout] (MSC service thread 1-3)    Temporary classloader: org.springframework.instrument.classloading.SimpleThrowawayClassLoader@13acaabd
17:51:41,457 INFO  [stdout] (MSC service thread 1-3)    excludeUnlistedClasses: true
17:51:41,457 INFO  [stdout] (MSC service thread 1-3)    JTA datasource: null
17:51:41,457 INFO  [stdout] (MSC service thread 1-3)    Non JTA datasource: com.mchange.v2.c3p0.ComboPooledDataSource [ acquireIncrement -> 3, acquireRetryAttempts -> 30, acquireRetryDelay -> 1000, autoCommitOnClose -> false, automaticTestTable -> null, breakAfterAcquireFailure -> false, checkoutTimeout -> 0, connectionCustomizerClassName -> null, connectionTesterClassName -> com.mchange.v2.c3p0.impl.DefaultConnectionTester, dataSourceName -> z8kfsx8l1ikdpo61c3bmxu|6b5638a, debugUnreturnedConnectionStackTraces -> false, description -> null, driverClass -> com.mysql.jdbc.Driver, factoryClassLocation -> null, forceIgnoreUnresolvedTransactions -> false, identityToken -> z8kfsx8l1ikdpo61c3bmxu|6b5638a, idleConnectionTestPeriod -> 60, initialPoolSize -> 3, jdbcUrl -> jdbc:mysql://localhost:3306/insurance, maxAdministrativeTaskTime -> 0, maxConnectionAge -> 0, maxIdleTime -> 60, maxIdleTimeExcessConnections -> 0, maxPoolSize -> 5, maxStatements -> 0, maxStatementsPerConnection -> 0, minPoolSize -> 1, numHelperThreads -> 3, numThreadsAwaitingCheckoutDefaultUser -> 0, preferredTestQuery -> select 1, properties -> {user=******, password=******}, propertyCycle -> 0, testConnectionOnCheckin -> false, testConnectionOnCheckout -> false, unreturnedConnectionTimeout -> 0, usesTraditionalReflectiveProxies -> false ]
17:51:41,457 INFO  [stdout] (MSC service thread 1-3)    Transaction type: RESOURCE_LOCAL
17:51:41,457 INFO  [stdout] (MSC service thread 1-3)    PU root URL: file:/home/mircea/jboss-as-7.0.2.Final/modules/sun/jdk/main/service-loader-resources/
17:51:41,457 INFO  [stdout] (MSC service thread 1-3)    Shared Cache Mode: UNSPECIFIED
17:51:41,457 INFO  [stdout] (MSC service thread 1-3)    Validation Mode: AUTO
17:51:41,457 INFO  [stdout] (MSC service thread 1-3)    Jar files URLs []
17:51:41,457 INFO  [stdout] (MSC service thread 1-3)    Managed classes names []
17:51:41,457 INFO  [stdout] (MSC service thread 1-3)    Mapping files names []
17:51:41,457 INFO  [stdout] (MSC service thread 1-3)    Properties []
17:51:41,459 INFO  [stdout] (MSC service thread 1-3) insurance-module 17:51:41.459 [MSC service thread 1-3] DEBUG org.hibernate.ejb.Ejb3Configuration - Detect class: true; detect hbm: true
17:51:41,462 INFO  [stdout] (MSC service thread 1-3) insurance-module 17:51:41.462 [MSC service thread 1-3] DEBUG o.h.ejb.packaging.AbstractJarVisitor - Searching mapped entities in jar/par: file:/home/mircea/jboss-as-7.0.2.Final/modules/sun/jdk/main/service-loader-resources/

Answer 1

if the packagesToScan does not point to the correct packages everything works just fine in Tomcat 7 but when deploying to JBoss it fails as described in the question.