Glassfish JNDI InitialContext

Question

我正在一個項目中嘗試連接到Glassfish EJB，但是遇到問題。

執行以下操作時：

    Properties props = new Properties();
    this.url = "10.128.128.135";
    props.setProperty("org.omg.CORBA.ORBInitialHost", this.url);
    props.setProperty("org.omg.CORBA.ORBInitialPort", "3700");
    final Context context = new InitialContext(props);
    this.userEJB = (UserEJB) context.lookup("ejb/User#com.xxxx.xxxxx.ejb.UserEJB");
    LoggerFactory.getLogger(this.getClass()).info("EJB client initialized with url: " + url);

我得到這個例外：

javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file:  java.naming.factory.initial
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:662)
at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:313)
at javax.naming.InitialContext.getURLOrDefaultInitCtx(InitialContext.java:350)
at javax.naming.InitialContext.lookup(InitialContext.java:417)
at com.xxxxx.xxxx.gwt.server.delegate.UserDelegate.<init>(UserDelegate.java:47)
at com.xxxxx.xxxx.gwt.server.rpc.LoginServiceImpl.<clinit>(LoginServiceImpl.java:36)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
at java.lang.Class.newInstance(Class.java:433)
at org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:153)
at org.mortbay.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:339)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:463)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1097)
at com.xxxxx.xxxx.gwt.MyHeadersFilter.doFilter(MyHeadersFilter.java:28)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1088)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.handler.RequestLogHandler.handle(RequestLogHandler.java:49)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:843)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:647)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)

之后，我還嘗試添加以下道具：

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");

然后我得到另一個異常：

java.lang.NullPointerException
at com.sun.enterprise.naming.impl.SerialContext.getORB(SerialContext.java:347)
at com.sun.enterprise.naming.impl.SerialContext.getProviderCacheKey(SerialContext.java:354)
at com.sun.enterprise.naming.impl.SerialContext.getRemoteProvider(SerialContext.java:384)
at com.sun.enterprise.naming.impl.SerialContext.getProvider(SerialContext.java:329)
at com.sun.enterprise.naming.impl.SerialContext.lookup(SerialContext.java:477)
at com.sun.enterprise.naming.impl.SerialContext.lookup(SerialContext.java:438)
at javax.naming.InitialContext.lookup(InitialContext.java:417)
at com.xxxxx.xxxx.gwt.server.delegate.UserDelegate.<init>(UserDelegate.java:46)
at com.xxxxx.xxxx.gwt.server.rpc.LoginServiceImpl.<clinit>(LoginServiceImpl.java:36)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
at java.lang.Class.newInstance(Class.java:433)
at org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:153)
at org.mortbay.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:339)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:463)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1097)
at com.xxxxx.xxxx.gwt.MyHeadersFilter.doFilter(MyHeadersFilter.java:28)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1088)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.handler.RequestLogHandler.handle(RequestLogHandler.java:49)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:843)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:647)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)

那么，如何查找我的EJB？

Answer 1

您應該確保已在glassfish管理控制台localhost \\ 4848中注冊了ejb資源。

您可以通過選擇服務選項卡-服務器-右鍵單擊glassfish-選擇啟動管理控制台來訪問netbeans上的管理控制台。

檢查EJB是否已在服務器中注冊。

還要查找資源注入，以獲取有關如何從Java應用程序訪問資源的更多信息。

我希望這是有幫助的。

請下次發布您的代碼。

Answer 2

這是GWT類路徑的問題。 部署該應用程序的工作正常，現在，我已通過從GWT類路徑中刪除jar並讓應用程序自行找到它們來修復GWT項目。 例如：

[WARN] Server class 'com.google.gwt.user.client.rpc.RemoteService' could not be found in the web app, but was found on the system classpath
   [WARN] Adding classpath entry 'file:/Users/linde/.m2/repository/com/google/gwt/gwt-servlet/2.5.1/gwt-servlet-2.5.1.jar' to the web app classpath for this session

現在，開發模式和部署均可工作。 盡管遠程調試（例如，設置GWT開發人員模式運行並從遠程計算機連接）不起作用，但給了我一個奇怪的錯誤。 也許這是GWT 2.5.1中的錯誤。