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hello :) need some time to pack sample app, but i traceddown the problem on serverside, here is the log:

2010-05-18 07:50:30,590 TRACE [org.jboss.ejb3.singleton.aop.impl.AOPBasedSingletonContainer] Received dynamic invocation for method with hash: 8010665628799209931
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} loadClass de.xxx.persistence.entity.core.Company resolve=false
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} aquireLockFairly WorkerThread#0[127.0.0.1:2119]
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} aquiredLock WorkerThread#0[127.0.0.1:2119] holding=1
2010-05-18 07:50:30,590 TRACE [org.jboss.detailed.classloader.ClassLoaderManager] registerLoaderThread, classloader=BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} thread=WorkerThread#0[127.0.0.1:2119] previousThread=null
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} load from domain de.xxx.persistence.entity.core.Company domain=ClassLoaderDomain@1474ea{DefaultDomain}
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.ClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} de.xxx.persistence.entity.core.Company matches parent beforeFilter=<EVERYTHING>
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.ClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} load class from parent de.xxx.persistence.entity.core.Company parent=java.net.URLClassLoader@1f934ad
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} findLoader de/xxx/persistence/entity/core/Company.class classLoader=BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} allExports=false findInParent=false
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} trying to load de/xxx/persistence/entity/core/Company.class from all exports of package de.xxx.persistence.entity.core null
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} not loading de/xxx/persistence/entity/core/Company.class from imports it has no delegates
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} trying to load de/xxx/persistence/entity/core/Company.class from requesting BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml}
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} get resource locally de/xxx/persistence/entity/core/Company.class
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} resource is blacklisted de/xxx/persistence/entity/core/Company.class
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.ClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} de.xxx.persistence.entity.core.Company does NOT match parent afterFilter=<NOTHING>
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} trying to load de.xxx.persistence.entity.core.Company using hack sun.misc.Launcher$AppClassLoader@f4a24a
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} unlock WorkerThread#0[127.0.0.1:2119] holding=1
2010-05-18 07:50:30,590 TRACE [org.jboss.detailed.classloader.ClassLoaderManager] unregisterLoaderThread, classloader=BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} thread=WorkerThread#0[127.0.0.1:2119] rescheduleTasks=true
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} class not found de.xxx.persistence.entity.core.Company
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} loadClass de.xxx.persistence.entity.core.Company resolve=false
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} aquireLockFairly WorkerThread#0[127.0.0.1:2119]
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} aquiredLock WorkerThread#0[127.0.0.1:2119] holding=1
2010-05-18 07:50:30,590 TRACE [org.jboss.detailed.classloader.ClassLoaderManager] registerLoaderThread, classloader=BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} thread=WorkerThread#0[127.0.0.1:2119] previousThread=null
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} load from domain de.xxx.persistence.entity.core.Company domain=ClassLoaderDomain@1474ea{DefaultDomain}
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.ClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} de.xxx.persistence.entity.core.Company matches parent beforeFilter=<EVERYTHING>
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.ClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} load class from parent de.xxx.persistence.entity.core.Company parent=java.net.URLClassLoader@1f934ad
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} findLoader de/xxx/persistence/entity/core/Company.class classLoader=BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} allExports=false findInParent=false
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} class is black listed de/xxx/persistence/entity/core/Company.class
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} not loading de/xxx/persistence/entity/core/Company.class from imports it has no delegates
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} trying to load de/xxx/persistence/entity/core/Company.class from requesting BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml}
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} get resource locally de/xxx/persistence/entity/core/Company.class
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} resource is blacklisted de/xxx/persistence/entity/core/Company.class
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.ClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} de.xxx.persistence.entity.core.Company does NOT match parent afterFilter=<NOTHING>
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} trying to load de.xxx.persistence.entity.core.Company using hack sun.misc.Launcher$AppClassLoader@f4a24a
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} unlock WorkerThread#0[127.0.0.1:2119] holding=1
2010-05-18 07:50:30,590 TRACE [org.jboss.detailed.classloader.ClassLoaderManager] unregisterLoaderThread, classloader=BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} thread=WorkerThread#0[127.0.0.1:2119] rescheduleTasks=true
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} class not found de.xxx.persistence.entity.core.Company
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} loadClass de.xxx.persistence.entity.BaseEntity resolve=false
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} aquireLockFairly WorkerThread#0[127.0.0.1:2119]
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} aquiredLock WorkerThread#0[127.0.0.1:2119] holding=1
2010-05-18 07:50:30,590 TRACE [org.jboss.detailed.classloader.ClassLoaderManager] registerLoaderThread, classloader=BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} thread=WorkerThread#0[127.0.0.1:2119] previousThread=null
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} load from domain de.xxx.persistence.entity.BaseEntity domain=ClassLoaderDomain@1474ea{DefaultDomain}
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.ClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} de.xxx.persistence.entity.BaseEntity matches parent beforeFilter=<EVERYTHING>
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.ClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} load class from parent de.xxx.persistence.entity.BaseEntity parent=java.net.URLClassLoader@1f934ad
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} findLoader de/xxx/persistence/entity/BaseEntity.class classLoader=BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} allExports=false findInParent=false
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} trying to load de/xxx/persistence/entity/BaseEntity.class from all exports of package de.xxx.persistence.entity null
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} not loading de/xxx/persistence/entity/BaseEntity.class from imports it has no delegates
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} trying to load de/xxx/persistence/entity/BaseEntity.class from requesting BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml}
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} get resource locally de/xxx/persistence/entity/BaseEntity.class
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} resource is blacklisted de/xxx/persistence/entity/BaseEntity.class
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.ClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} de.xxx.persistence.entity.BaseEntity does NOT match parent afterFilter=<NOTHING>
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} trying to load de.xxx.persistence.entity.BaseEntity using hack sun.misc.Launcher$AppClassLoader@f4a24a
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} unlock WorkerThread#0[127.0.0.1:2119] holding=1
2010-05-18 07:50:30,590 TRACE [org.jboss.detailed.classloader.ClassLoaderManager] unregisterLoaderThread, classloader=BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} thread=WorkerThread#0[127.0.0.1:2119] rescheduleTasks=true
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} class not found de.xxx.persistence.entity.BaseEntity
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} loadClass de.xxx.persistence.entity.BaseEntity resolve=false
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} aquireLockFairly WorkerThread#0[127.0.0.1:2119]
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} aquiredLock WorkerThread#0[127.0.0.1:2119] holding=1
2010-05-18 07:50:30,590 TRACE [org.jboss.detailed.classloader.ClassLoaderManager] registerLoaderThread, classloader=BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} thread=WorkerThread#0[127.0.0.1:2119] previousThread=null
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} load from domain de.xxx.persistence.entity.BaseEntity domain=ClassLoaderDomain@1474ea{DefaultDomain}
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.ClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} de.xxx.persistence.entity.BaseEntity matches parent beforeFilter=<EVERYTHING>
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.ClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} load class from parent de.xxx.persistence.entity.BaseEntity parent=java.net.URLClassLoader@1f934ad
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} findLoader de/xxx/persistence/entity/BaseEntity.class classLoader=BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} allExports=false findInParent=false
2010-05-18 07:50:30,590 TRACE [org.jboss.classloader.spi.base.BaseClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} class is black listed de/xxx/persistence/entity/BaseEntity.class
2010-05-18 07:50:30,606 TRACE [org.jboss.classloader.spi.base.BaseClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} not loading de/xxx/persistence/entity/BaseEntity.class from imports it has no delegates
2010-05-18 07:50:30,606 TRACE [org.jboss.classloader.spi.base.BaseClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} trying to load de/xxx/persistence/entity/BaseEntity.class from requesting BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml}
2010-05-18 07:50:30,606 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} get resource locally de/xxx/persistence/entity/BaseEntity.class
2010-05-18 07:50:30,606 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} resource is blacklisted de/xxx/persistence/entity/BaseEntity.class
2010-05-18 07:50:30,606 TRACE [org.jboss.classloader.spi.ClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} de.xxx.persistence.entity.BaseEntity does NOT match parent afterFilter=<NOTHING>
2010-05-18 07:50:30,606 TRACE [org.jboss.classloader.spi.base.BaseClassLoaderDomain] ClassLoaderDomain@1474ea{DefaultDomain} trying to load de.xxx.persistence.entity.BaseEntity using hack sun.misc.Launcher$AppClassLoader@f4a24a
2010-05-18 07:50:30,606 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} unlock WorkerThread#0[127.0.0.1:2119] holding=1
2010-05-18 07:50:30,606 TRACE [org.jboss.detailed.classloader.ClassLoaderManager] unregisterLoaderThread, classloader=BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} thread=WorkerThread#0[127.0.0.1:2119] rescheduleTasks=true
2010-05-18 07:50:30,606 TRACE [org.jboss.classloader.spi.base.BaseClassLoader] BaseClassLoader@13aa7d4{vfs:///D:/Dev/EDAP/jboss-6.0.0.M3/server/default/deploy/ejb3-connectors-jboss-beans.xml} class not found de.xxx.persistence.entity.BaseEntity

it seems this error comes from serverside, because on clientside i can workwith these objects, they are known. only the following methodcall raises this exception: ph.get("mein Param", c);

Hope this log helps a little bit.