Question

我们希望将groovy / grails用作Glassfish-Remote-Client，但我们遇到了奇怪的ClassLoading问题。

首先通过groovy / grails调用时触发错误的Testcode。通过java调用时没关系。当通过groovy运行时，它会触发一个 java.lang.ClassCastException：com.sun.corba.ee.impl.javax.rmi.PortableRemoteObject无法强制转换为javax.rmi.CORBA.PortableRemoteObjectDelegate in（PortableRemoteObject.java:77）在该错误之前，可以手动进行转换。

========== source ==========

package test;

import java.lang.reflect.Field;

public class J2EETest {
   public static void main(String[] args) throws Exception {
            new J2EETest().classLoaderTest();
   }

   public static void classLoaderTest() throws Exception {
           ClassLoader classLoader = J2EETest.class.getClassLoader();
           ClassLoader threadClassLoader = Thread.currentThread().getContextClassLoader();
           System.out.println("classLoader: " + classLoader);
           System.out.println("threadClassLoader: " + threadClassLoader);

           Class klass = Class.forName( "com.sun.corba.ee.impl.javax.rmi.PortableRemoteObject", false, threadClassLoader );
           Object obj = klass.newInstance();
           System.out.println("Object -> " + obj.toString());
           // This works
           javax.rmi.CORBA.PortableRemoteObjectDelegate del = (javax.rmi.CORBA.PortableRemoteObjectDelegate) obj;
             try {
                 System.out.println("Init of javax.rmi.PortableRemoteObject");
                   // This doesn't work ! 
                   System.out.println( Class.forName("javax.rmi.PortableRemoteObject", true, threadClassLoader));
                   Class prOklass = javax.rmi.PortableRemoteObject.class;
                   Field staticfield = prOklass.getDeclaredField("proDelegate");
                   staticfield.setAccessible(true);
                   System.out.println("Reflection: PortableRemoteObject.proDelegate ->" + staticfield.get(null));
                   System.out.println("OK");
               }
               catch(Throwable e) {
                   System.err.println("BOOM");
                   e.printStackTrace();
              }

  }

  }

======= JAVA测试运行=======

$ export CLASSPATH=build:lib/glassfish/gf-client-module.jar     # gf-client-module.jar -> GLASSFISH-Client Libs
$ java  -Djavax.rmi.CORBA.PortableRemoteObjectClass=com.sun.corba.ee.impl.javax.rmi.PortableRemoteObject test.J2EETest 
classLoader: sun.misc.Launcher$AppClassLoader@e776f7
threadClassLoader: sun.misc.Launcher$AppClassLoader@e776f7
Object -> com.sun.corba.ee.impl.javax.rmi.PortableRemoteObject@5511e28
Init of javax.rmi.PortableRemoteObject class javax.rmi.PortableRemoteObject
Reflection: PortableRemoteObject.proDelegate -> com.sun.corba.ee.impl.javax.rmi.PortableRemoteObject@20e5f01b

OK

=======现在是Groovy-Version =======

$ groovy -Djavax.rmi.CORBA.PortableRemoteObjectClass=com.sun.corba.ee.impl.javax.rmi.PortableRemoteObject -e "test.J2EETest.classLoaderTest()"
classLoader: org.codehaus.groovy.tools.RootLoader@5dcba031
threadClassLoader: org.codehaus.groovy.tools.RootLoader@5dcba031
Object -> com.sun.corba.ee.impl.javax.rmi.PortableRemoteObject@1bf3f158
Init of javax.rmi.PortableRemoteObject

BOOM

java.lang.ExceptionInInitializerError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at test.J2EETest.classLoaderTest(J2EETest.java:83)
at test.J2EETest$classLoaderTest.call(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:42)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:112)
at script_from_command_line.run(script_from_command_line:1)

at groovy.lang.GroovyShell.runScriptOrMainOrTestOrRunnable(GroovyShell.java:266)
at groovy.lang.GroovyShell.run(GroovyShell.java:517)
at groovy.lang.GroovyShell.run(GroovyShell.java:172)
at groovy.ui.GroovyMain.processOnce(GroovyMain.java:553)
at groovy.ui.GroovyMain.run(GroovyMain.java:337)
at groovy.ui.GroovyMain.process(GroovyMain.java:323)
at groovy.ui.GroovyMain.processArgs(GroovyMain.java:120)
at groovy.ui.GroovyMain.main(GroovyMain.java:100)     

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.codehaus.groovy.tools.GroovyStarter.rootLoader(GroovyStarter.java:108)
at org.codehaus.groovy.tools.GroovyStarter.main(GroovyStarter.java:130)

Caused by: java.lang.ClassCastException: com.sun.corba.ee.impl.javax.rmi.PortableRemoteObject cannot be cast to   javax.rmi.CORBA.PortableRemoteObjectDelegate   at javax.rmi.PortableRemoteObject.<clinit>(PortableRemoteObject.java:77)
 ... 22 more

=======现在Groovy-Version WITHOUT -Djavax.rmi.CORBA.PortableRemoteObjectClass =======

这是有效的，但不是glassfish客户端的选项，因为InitialContext（或其他东西）将设置javax.rmi.CORBA.PortableRemoteObjectClass = com.sun.corba.ee.impl.javax.rmi.PortableRemoteObject

$ groovy -e "test.J2EETest.classLoaderTest()"                       
classLoader: org.codehaus.groovy.tools.RootLoader@3b4d82e1
threadClassLoader: org.codehaus.groovy.tools.RootLoader@3b4d82e1
Object -> com.sun.corba.ee.impl.javax.rmi.PortableRemoteObject@527e2f47
Init of javax.rmi.PortableRemoteObject
class javax.rmi.PortableRemoteObject
Reflection:  PortableRemoteObject.proDelegate -> com.sun.corba.se.impl.javax.rmi.PortableRemoteObject@5b3bd1c0  # com.sun.corba.ee != com.sun.corba.se

好的

是否有人遇到类似问题或知道如何使此代码正常工作？

亲切的问候

谢

Answer 1

我试着运行你的例子，我得到了：

classLoader: groovy.lang.GroovyClassLoader$InnerLoader@538d7ace
threadClassLoader: groovy.lang.GroovyClassLoader@1e22ab57
Caught: java.lang.ClassNotFoundException: com.sun.corba.ee.impl.javax.rmi.PortableRemoteObject
java.lang.ClassNotFoundException: com.sun.corba.ee.impl.javax.rmi.PortableRemoteObject
    at java_lang_Class$forName.call(Unknown Source)
    at test.J2EETest.classLoaderTest(J2EETest.groovy:16)
    at test.J2EETest$classLoaderTest.call(Unknown Source)
    at test.J2EETest.main(J2EETest.groovy:7)

我能建议的最好的办法是隔离不同的东西。最可能的罪魁祸首是你在两种情况下使用的JVM。将用于执行groovy的JVM与用于直接运行jar的JVM进行比较。我还建议将groovy-all.jar放入Classpath并尝试从Java运行Groovy解释器。

奇怪的groovy类加载异常

1 个答案: