从Glassfish的另一个实例访问无状态EJB [英] Accessing a stateless EJB from another instance of Glassfish
问题描述
有一个令我烦恼的问题，我找不到任何统一的方式来解决互联网。我正在开发一个使用Java EE，Glassfish和Netbeans的企业应用程序。
there is an issue that troubles me and I cannot find any uniform way to solve it around the internet. I am developing an enterprise application using Java EE, Glassfish and Netbeans.
我有两个Glassfish的实例，我正在建立一个企业应用程序在两者之间。我有一个在Glassfish的一个实例上运行的网页（有几个JSP和几个HttpServlets）。另一方面，我想实现应用程序的业务逻辑。也就是说，我有一些Java实体Bean，还有一个使用这些实体bean的远程接口的EJB。
I have two instances of Glassfish set up, and I am building an enterprise application split among the two. I have a web page (with a couple of JSPs and a couple of HttpServlets) running on one instance of Glassfish. On the other instance, I want to implement the business logic of the app. That is, I have some Java Entity Beans in it, and also an EJB with a remote interface that uses these entity beans.
我的目标是能够访问EJB远程从第一个glassfish的servlet。我按照这个说明但不成功。我正在提供代码段来获取更具体的...
My goal is to be able to access the EJB remotely from the servlets on the first instance of glassfish. I have followed the instructions found in this post but unsuccessfully. I am providing code snippets to get more specific...
在Glassfish的一个实例上，EJB的远程接口：
On one instance of Glassfish, EJB's remote Interface:
@Remote
public interface MyEjbRemote {
//...
}
和无状态bean：
@Stateless(name="ejb/MyEjb")
public class MyEjb implements MyEjbRemote {
//...
}
另一个实例：
public class MyServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
MyEjbRemote = lookupEjb();
//...
}
private MyEjbRemote lookupEjb() {
Properties props = new Properties();
props.setProperty("java.naming.factory.initial",
"com.sun.enterprise.naming.SerialInitContextFactory");
props.setProperty("java.naming.factory.url.pkgs",
"com.sun.enterprise.naming");
props.setProperty("java.naming.factory.state",
"com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl");
//default: localhost
props.setProperty("org.omg.CORBA.ORBInitialHost",
"localhost");
//default: 3700
props.setProperty("org.omg.CORBA.ORBInitialPort", "2037");
InitialContext ic = new InitialContext(props);
return (MyEjbRemote) ic.lookup("ejb/MyEjb");
}
}
不幸的是，当我启动我的网站并尝试查找远程ejb我得到以下异常：
Unfortunately when I launch my website and try to lookup the remote ejb I get the following exception:
WARNING: Internal error flushing the buffer in release()
WARNING: StandardWrapperValve[jsp]: PWC1406: Servlet.service() for servlet jsp threw exception
java.io.IOException: Stream closed
at org.apache.jasper.runtime.JspWriterImpl.ensureOpen(JspWriterImpl.java:277)
at org.apache.jasper.runtime.JspWriterImpl.clearBuffer(JspWriterImpl.java:222)
at org.apache.jsp.home_jsp._jspService(home_jsp.java from :76)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:109)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:406)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:483)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:373)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1523)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:641)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97)
at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:85)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:325)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:226)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:165)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57)
at com.sun.grizzly.ContextTask.run(ContextTask.java:69)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309)
at java.lang.Thread.run(Thread.java:662)
我的实现缺少什么？建议/想法？请问我的问题描述中是否缺少某些内容，这是我第一次在本网站发布。我感谢你的时间！
What is missing from my implementation?Any suggestions/ideas? Please ask if something is missing from the description of my problem, it's my first time posting in this site. I appreciate your time!
Ilias
推荐答案
完成Glassfish 3.1 + Eclipse Helios + EJB 3.1示例
简单的Main.java（SIMPLE客户端项目不需要部署） p>
Simple Main.java (SIMPLE Client Project NO NEED TO DEPLOY)
Properties props = new Properties();
props.setProperty("java.naming.factory.initial", "com.sun.enterprise.naming.SerialInitContextFactory");
props.setProperty("java.naming.factory.url.pkgs", "com.sun.enterprise.naming");
props.setProperty("java.naming.factory.state", "com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl");
// optional. Defaults to localhost. Only needed if web server is running
// on a different host than the appserver
props.setProperty("org.omg.CORBA.ORBInitialHost", "127.0.0.1");
// optional. Defaults to 3700. Only needed if target orb port is not 3700.
props.setProperty("org.omg.CORBA.ORBInitialPort", "3700");
InitialContext ic = new InitialContext(props);
GlassfishSessionBeanRemote gRemote = (GlassfishSessionBeanRemote)ic.lookup("java:global/EJBGFish/GlassfishSessionBean!com.example.GlassfishSessionBeanRemote");
gRemote.sayHello();
EJB模块 - 您必须将所有下面的三个作为JAR文件（简单地运行为在Eclipse中的服务器） - 已部署
@Stateless
public class GlassfishSessionBean implements GlassfishSessionBeanRemote, GlassfishSessionBeanLocal {
@Override
public void sayHello() {
System.out.println("First Glassfish App!");
}
远程和本地界面如下： / p>
REMOTE AND LOCAL INTERFACES ARE AS BELOW.
@Remote
public interface GlassfishSessionBeanRemote {
public void sayHello();
}
@Local
public interface GlassfishSessionBeanLocal {
public void sayHello();
}
最重要的要点：
- 必须将gf-client.jar从GLASSFISH 3.1 LIB文件夹添加到主。 java的类路径（第一个）
- 将Main EJB项目添加到Main.java的类路径。
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