您当前的位置: 我写了很简单的SessionBean，部署的时候都是报错不知道为为什么，各位求解释，初学EJB，什么都不懂，贴下代码：
@Stateless
@Remote
public class UserManagerBean implements UserManager {
private EntityManager entityManager;
@PersistenceContext
public EntityManager getEntityManager() {
return entityManager;
}
public void setEntityManager(EntityManager entityManager) {
this.entityManager = entityManager;
}
public void add(Teacher tea) {
entityManager.persist(tea);
}
}
persistence.xml文件中配置：
<persistence-unit name="test" transaction-type="JTA">
<jta-data-source>MySqlDS</jta-data-source>
<properties>
<property name="hibernate.hbm2ddl.auto" value="update" />
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />
</properties>
</persistence-unit>
JDBC的驱动包也已经复制到JBoss安装目\server\lib下，MySqlDS的命名空间也没问题，配置文件中加了<use-java-context>false</use-java-context>
我试了下，如果把Bean的生成类型@Stateless去掉，则是可以部署的，一加上就报错，不知道为什么，下面贴下错误信息：
org.jboss.deployers.spi.DeploymentException: Error deploying EJB_01.jar: Exception while processing container metadata for EJB: UserManagerBean in unit: EJB_01.jar
at org.jboss.ejb3.deployers.Ejb3Deployer.deploy(Ejb3Deployer.java:196)
at org.jboss.ejb3.deployers.Ejb3Deployer.deploy(Ejb3Deployer.java:99)
at org.jboss.deployers.vfs.spi.deployer.AbstractVFSRealDeployer.internalDeploy(AbstractVFSRealDeployer.java:45)
at org.jboss.deployers.spi.deployer.helpers.AbstractRealDeployer.deploy(AbstractRealDeployer.java:50)
at org.jboss.deployers.plugins.deployers.DeployerWrapper.deploy(DeployerWrapper.java:171)
at org.jboss.deployers.plugins.deployers.DeployersImpl.doDeploy(DeployersImpl.java:1439)
at org.jboss.deployers.plugins.deployers.DeployersImpl.doInstallParentFirst(DeployersImpl.java:1157)
at org.jboss.deployers.plugins.deployers.DeployersImpl.install(DeployersImpl.java:1098)
at org.jboss.dependency.plugins.AbstractControllerContext.install(AbstractControllerContext.java:348)
at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:1631)
at org.jboss.dependency.plugins.AbstractController.incrementState(AbstractController.java:934)
at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:1082)
at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:984)
at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:822)
at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:553)
at org.jboss.deployers.plugins.deployers.DeployersImpl.process(DeployersImpl.java:781)
at org.jboss.deployers.plugins.main.MainDeployerImpl.process(MainDeployerImpl.java:702)
at org.jboss.system.server.profileservice.repository.MainDeployerAdapter.process(MainDeployerAdapter.java:117)
at org.jboss.system.server.profileservice.hotdeploy.HDScanner.scan(HDScanner.java:362)
at org.jboss.system.server.profileservice.hotdeploy.HDScanner.run(HDScanner.java:255)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)