Thx allot ALRubinger,
this solve the NullpointerException!! I forgot to add the new Jars to my 
Eclipse Project *ups* i use this library's from jboss 4.0.5 now:
*jboss-ejb3x.jar
*hibernate-client.jar
*ejb3-persistence.jar


But yet i get this crazy error!

Work right!!
WM_MailManager mm =(WM_MailManager) new 
InitialContext().lookup("WM_MailManagerBean/local");
  | mm.deleteAllMailsInFolder(folder,userId,leaveHashes);


Create the following error!
@EJB
  | WM_MailManager mailManager;
  | ....
  | 
  | mailManager.deleteAllMailsInFolder(folder,userId,leaveHashes);
        


anonymous wrote : 00:55:33,281 ERROR [STDERR] 
javax.ejb.EJBTransactionRolledbackException: 
java.lang.IllegalArgumentException: Wrong target. class 
wm2.ejb.session.WM_MailManagerBean for public void 
wm2.ejb.session.WM_MailManagerBean.deleteAllMailsInFolder(wm2.ejb.entity.WM_Folder,java.lang.Integer,boolean)
 throws wm2.exception.WM_PermissionDenied
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.ejb3.tx.Ejb3TxPolicy.handleInCallerTx(Ejb3TxPolicy.java:93)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aspects.tx.TxPolicy.invokeInCallerTx(TxPolicy.java:130)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:201)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:62)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:77)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.ejb3.security.Ejb3AuthenticationInterceptor.invoke(Ejb3AuthenticationInterceptor.java:131)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:47)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:263)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:58)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.ejb3.stateless.StatelessRemoteProxy.invoke(StatelessRemoteProxy.java:102)
  | 00:55:33,281 ERROR [STDERR]         at 
$Proxy687.deleteAllMailsInFolder(Unknown Source)
  | 00:55:33,281 ERROR [STDERR]         at 
wm2.ejb.session.WM_FolderManagerBean.recrusiveDeleteFolderAndContent(WM_FolderManagerBean.java:264)
  | 00:55:33,281 ERROR [STDERR]         at 
wm2.ejb.session.WM_FolderManagerBean.deleteFolderAndContentRecrusive(WM_FolderManagerBean.java:242)
  | 00:55:33,281 ERROR [STDERR]         at 
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  | 00:55:33,281 ERROR [STDERR]         at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  | 00:55:33,281 ERROR [STDERR]         at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  | 00:55:33,281 ERROR [STDERR]         at 
java.lang.reflect.Method.invoke(Method.java:585)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:112)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:166)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:63)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:54)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:79)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:197)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:62)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:77)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.ejb3.security.Ejb3AuthenticationInterceptor.invoke(Ejb3AuthenticationInterceptor.java:131)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:47)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:263)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aop.Dispatcher.invoke(Dispatcher.java:106)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:828)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:681)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:358)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:412)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:239)
  | 00:55:33,281 ERROR [STDERR] Caused by: java.lang.IllegalArgumentException: 
Wrong target. class wm2.ejb.session.WM_MailManagerBean for public void 
wm2.ejb.session.WM_MailManagerBean.deleteAllMailsInFolder(wm2.ejb.entity.WM_Folder,java.lang.Integer,boolean)
 throws wm2.exception.WM_PermissionDenied
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aop.joinpoint.MethodInvocation.handleErrors(MethodInvocation.java:141)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:116)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:166)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:63)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:54)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 00:55:33,281 ERROR [STDERR]         at 
org.jboss.aspects.tx.TxPolicy.invokeInCallerTx(TxPolicy.java:126)
  | 00:55:33,281 ERROR [STDERR]         ... 54 more
  | 


WM_Folder:
package wm2.ejb.entity;
  | 
  | import javax.persistence.Column;
  | import javax.persistence.Entity;
  | import javax.persistence.GeneratedValue;
  | import javax.persistence.GenerationType;
  | import javax.persistence.Id;
  | import javax.persistence.NamedQueries;
  | import javax.persistence.NamedQuery;
  | import javax.persistence.OneToMany;
  | import javax.persistence.Table;
  | 
  | @SuppressWarnings("serial")
  | @Entity
  | @Table(name="folder")
  | @NamedQueries({
  |             ....
  | })
  |             
  | public class WM_Folder implements Serializable{
  | ....
  | }


thx 4 help

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