Jboss下配置javamail的问题。

1.今天在jboss下面发送电子邮件的时候，抛出了如下异常：

[JmsServerSession] Unexpected error delivering message org.jboss.mq.SpyMapMessage {
Header { 
   jmsDestination  : TOPIC.EmailService
   jmsDeliveryMode : 2
   jmsExpiration   : 0
   jmsPriority     : 4
   jmsMessageID    : ID:5-12110906215461
   jmsTimeStamp    : 1211090621546
   jmsCorrelationID: null
   jmsReplyTo      : null
   jmsType         : null
   jmsRedelivered  : false
   jmsProperties   : {content=欢迎你注册为我们的会员, subject=欢迎你注册为我们的会员, from=[e-mail], destination=[e-mail]}
   jmsPropReadWrite: false
   msgReadOnly     : true
   producerClientId: ID:5
}
}
javax.ejb.EJBTransactionRolledbackException
	at org.jboss.ejb3.tx.Ejb3TxPolicy.handleInCallerTx(Ejb3TxPolicy.java:87)
	at org.jboss.aspects.tx.TxPolicy.invokeInCallerTx(TxPolicy.java:130)
	at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:195)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:62)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.ejb3.mdb.MessagingContainer.localInvoke(MessagingContainer.java:245)
	at org.jboss.ejb3.mdb.inflow.MessageInflowLocalProxy.delivery(MessageInflowLocalProxy.java:268)
	at org.jboss.ejb3.mdb.inflow.MessageInflowLocalProxy.invoke(MessageInflowLocalProxy.java:138)
	at $Proxy121.onMessage(Unknown Source)
	at org.jboss.resource.adapter.jms.inflow.JmsServerSession.onMessage(JmsServerSession.java:178)
	at org.jboss.mq.SpyMessageConsumer.sessionConsumerProcessMessage(SpyMessageConsumer.java:891)
	at org.jboss.mq.SpyMessageConsumer.addMessage(SpyMessageConsumer.java:170)
	at org.jboss.mq.SpySession.run(SpySession.java:323)
	at org.jboss.resource.adapter.jms.inflow.JmsServerSession.run(JmsServerSession.java:237)
	at org.jboss.resource.work.WorkWrapper.execute(WorkWrapper.java:204)
	at org.jboss.util.threadpool.BasicTaskWrapper.run(BasicTaskWrapper.java:275)
	at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:743)
	at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.NullPointerException
	at com.sun.mail.handlers.text_plain.writeTo(text_plain.java:121)
	at javax.activation.ObjectDataContentHandler.writeTo(DataHandler.java:868)
	at javax.activation.DataHandler.writeTo(DataHandler.java:301)
	at javax.mail.internet.MimeUtility.getEncoding(MimeUtility.java:248)
	at javax.mail.internet.MimeBodyPart.updateHeaders(MimeBodyPart.java:1268)
	at javax.mail.internet.MimeMessage.updateHeaders(MimeMessage.java:2012)
	at javax.mail.internet.MimeMessage.saveChanges(MimeMessage.java:1980)
	at javax.mail.Transport.send(Transport.java:97)
	at com.bookshop.logic.serviceMDB.EmailServiceMDB.onMessage(EmailServiceMDB.java:60)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:112)
	at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:166)
	at org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:63)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:54)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.aspects.tx.TxPolicy.invokeInCallerTx(TxPolicy.java:126)
	... 17 more

最终发现原来不小心没有设置content，结果content为null，所以把content设置好后就OK了。写下来让以后遇到此问题的弟兄们尽快解决。