我在EJB2.0上又发布了一个问题。我想我之前的问题不会得到任何答案,因为EJB2.0是一种非常过时的技术,没有人想再研究它了。但我的第一个问题得到了回答,我又在碰碰运气了。
我创建了一个简单的EJB 2.x实体bean。我的实体bean使用另一个类(UniqueIdGenerator(为持久主键字段生成主键值。UniqueIdGenerator使用log4j和JDBC连接,所以我为EJB项目配置了适当的构建路径引用。
在EJB项目的构建路径中添加了以下JARSlog4j-1.2.16.jardb2jcc.jardb2jcc_license_cu.jar
然后,我将持久字段映射到数据库表字段。使用RSA中的Prepare for Deployment选项生成代码(部署在WAS上(。
创建了EAR项目,并使用ProjectReferences选项将EJB项目(HMS(添加到EAR项目中。
我没有设置任何其他路径/类路径。
启动WAS,在WAS上部署EAR,并启动Universal Test Client来测试实体bean。使用远程接口,我尝试创建我的第一个bean,输入字段的值,然后在Universal测试客户端上单击提交。在服务器端,它调用了实体bean的ejbCreate((,但在加载UniqueIdGenerator类时失败,错误为NoClassDefFoundError
这是堆栈跟踪
java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
com.ibm.ejs.container.CreateFailureException: ; nested exception is:
java.lang.NoClassDefFoundError: org.apache.log4j.LogManager
at com.ibm.CORBA.iiop.UtilDelegateImpl.mapSystemException(UtilDelegateImpl.java:235)
at com.ibm.CORBA.iiop.UtilDelegateImpl.wrapException(UtilDelegateImpl.java:743)
at javax.rmi.CORBA.Util.wrapException(Util.java:296)
at ejbs._EJSRemoteCMPAddressHome_824957aa_Stub.create(_EJSRemoteCMPAddressHome_824957aa_Stub.java:258)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
at java.lang.reflect.Method.invoke(Method.java:611)
at com.ibm.etools.utc.model.ReflectionMethodModel.invoke(ReflectionMethodModel.java:65)
at com.ibm.etools.utc.servlet.InvokeServlet.invoke(InvokeServlet.java:113)
at com.ibm.etools.utc.servlet.InvokeServlet.doPost(InvokeServlet.java:374)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:738)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1657)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:939)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:502)
at com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:179)
at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:91)
at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:864)
at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1583)
at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:186)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:452)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:511)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:305)
at com.ibm.ws.http.channel.inbound.impl.HttpICLReadCallback.complete(HttpICLReadCallback.java:83)
at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165)
at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138)
at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204)
at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:775)
at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1604)
Caused by: com.ibm.ejs.container.CreateFailureException: ; nested exception is:
java.lang.NoClassDefFoundError: org.apache.log4j.LogManager
at ejbs.EJSCMPAddressHomeBean_824957aa.create(EJSCMPAddressHomeBean_824957aa.java:47)
at ejbs.EJSRemoteCMPAddressHome_824957aa.create(EJSRemoteCMPAddressHome_824957aa.java:28)
at ejbs._EJSRemoteCMPAddressHome_824957aa_Stub.create(_EJSRemoteCMPAddressHome_824957aa_Stub.java:251)
... 29 more
Caused by: java.lang.NoClassDefFoundError: org.apache.log4j.LogManager
at utils.UniqueLongIdGenerator.(UniqueLongIdGenerator.java:40)
at java.lang.J9VMInternals.initializeImpl(Native Method)
at java.lang.J9VMInternals.initialize(J9VMInternals.java:200)
at utils.UniqueIdGenerator.(UniqueIdGenerator.java:28)
at utils.UniqueIdGenerator.(UniqueIdGenerator.java:24)
at java.lang.J9VMInternals.initializeImpl(Native Method)
at java.lang.J9VMInternals.initialize(J9VMInternals.java:200)
at ejbs.AddressBean.ejbCreate(AddressBean.java:46)
at ejbs.ConcreteAddress_824957aa.ejbCreate(ConcreteAddress_824957aa.java:122)
at ejbs.EJSCMPAddressHomeBean_824957aa.create(EJSCMPAddressHomeBean_824957aa.java:33)
... 31 more
Caused by: java.lang.ClassNotFoundException: org.apache.log4j.LogManager
at java.net.URLClassLoader.findClass(URLClassLoader.java:434)
at com.ibm.ws.bootstrap.ExtClassLoader.findClass(ExtClassLoader.java:191)
at java.lang.ClassLoader.loadClass(ClassLoader.java:660)
at com.ibm.ws.bootstrap.ExtClassLoader.loadClass(ExtClassLoader.java:111)
at java.lang.ClassLoader.loadClass(ClassLoader.java:626)
at com.ibm.ws.classloader.ProtectionClassLoader.loadClass(ProtectionClassLoader.java:62)
at com.ibm.ws.classloader.ProtectionClassLoader.loadClass(ProtectionClassLoader.java:58)
at com.ibm.ws.classloader.CompoundClassLoader.loadClass(CompoundClassLoader.java:509)
at java.lang.ClassLoader.loadClass(ClassLoader.java:626)
... 41 more
配置中有遗漏吗。我需要在EAR项目的某个地方添加所有的jar文件吗。在EJB项目的构建路径中设置它们难道还不够吗?
我在以下链接上找到了答案
如何在ejb jar 中包含外部jar
开发者作品http://www.ibm.com/developerworks/rational/library/07/1211_schrag/index.html
您需要将第三方JAR导入到EAR项目中,然后在EJB项目MANIFEST.MF文件中设置JAR依赖关系。将外部jar导入EAR项目后,它们将在MANIFEST.MF 的资源管理器中可用