OSGi客户端从JavaEE服务器访问EJB的RMI ClassCastException [英] RMI ClassCastException in OSGi client accessing EJB from JavaEE server

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问题描述

我有一个OSGi应用程序。使用EJB context.lookup必须将Thread上下文类加载器设置为bundle类加载器才能投射。像这样： 

  Thread.currentThread（）。setContextClassLoader（getClass（）。getClassLoader（））; 
 Entity entity = bean.getOne（）; 
 System.out.println（entity.getClass（）。getClassLoader（））;

输出是


org.apache.felix.framework.BundleWiringImpl@7468776f

此代码有效。如果我有ArrayList，则无法进行转换。

  Thread.currentThread（）。setContextClassLoader（getClass（）。getClassLoader ））; 
 ArrayList< Entity>实体= bean.getMany（）;

此代码返回ClassCastException。



检查 

  ArrayList< Entity> temp = new ArrayList< Entity>（）; 
 System.out.println（temp.getClass（）。getClassLoader（））;

返回NULL - 它表示 bootstrap类。如何解决这个问题？



编辑： ArrayList with String works，classic array works，但ArrayList and ArrayList with Entiry does not work。

 类Bean {
 .... 
 @Override //这不起作用
 public ArrayList< Entity> readMany（）{
 Entity dir1 = new Entity（）; 
 dir1.setContent（1 test）; 
实体dir2 =新实体（）; 
 dir2.setContent（2 test）; 
 ArrayList< Entity> result = new ArrayList<>（）; 
 result.add（dir1）; result.add（dir2）; 
返回结果; 
} 
 
 @Override //这个工作
 public ArrayList< String> readMany2（）{
 String str1 = new String（1 test）; 
 String str2 = new String（2 test）; 
 ArrayList< String> result = new ArrayList<>（）; 
 result.add（str1）; 
 result.add（str2）; 
返回结果; 
 
 
 @Override //这个工作
 public Entity [] readArray（）{
 ArrayList< Entity> AL = readMany（）; 
实体[] ar =新实体[al.size（）]; 
 for（int i = 0; i< al.size（）; i ++）{
 ar [i] = al.get（i）; 
} 
 return ar; 
} 
 
 @Override //这不工作$ b $ public ArrayList readSimpleArrayList（）{
 ArrayList< Entity>加仑= readMany（）; 
 ArrayList al = new ArrayList（）; 
 for（Entity obj：gal）{
 al.add（obj）; 
} 
 return al; 
} 
 ... 
}

这里是日志


java.lang.ClassCastException：
com.test.cmn.shd.base.dir.language.LanguageDirEntity不能转换to
com.test.cmn.shd.base.dir.language.LanguageDirEntity at
com.test.cmn.dt.base.Activator.start（Activator.java:83）at
org.apache.felix.framework.util.SecureAction.startActivator（SecureAction.java:645）
在org.apache.felix.framework.Felix.activateBundle（Felix.java:1977）
。在组织。 apache.felix.framework.Felix.startBundle（Felix.java:1895）维持在
org.apache.felix
org.apache.felix.framework.BundleImpl.start（BundleImpl.java:944）。 framework.BundleImpl.start（BundleImpl.java:931）在
com.test.cmn.dt.loader.LoaderModel.startCoreModule（LoaderModel.java:149）
在com.test.cmn.dt. loader.LoaderModel.access $ 100（LoaderModel.java:39）
at
com.test.cmn.dt.loader.LoaderModel $ InstallAndStartModuleWorker.doInBackg轮（LoaderModel.java:79）
。在
$ com.test.cmn.dt.loader.LoaderModel InstallAndStartModuleWorker.doInBackground（LoaderModel.java:73）
。在javax.swing.SwingWorker $ 1 .CALL（SwingWorker.java:296）在
java.util.concurrent.FutureTask.run（FutureTask.java:262）在
javax.swing.SwingWorker.run（SwingWorker.java:335）在
java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1145）
。在
$ java.util.concurrent.ThreadPoolExecutor中Worker.run（ThreadPoolExecutor.java:615）
在java.lang.Thread.run（Thread.java:744）

编辑2 - 完整代码 strong>此代码在客户端计算机上执行。 JavaEE（GF4）正在服务器上运行。有三个osgi包：用于服务器，用于客户端和共享。的共享副本是无论在服务器和客户端上，并包含和LanguageDirBeanRemote LanguageDirEntity。



 类加载器thatLoader = Thread.currentThread（）。 getContextClassLoader（）; 
 Thread.currentThread（）。setContextClassLoader（getClass（）。getClassLoader（））; 
尝试{
属性jndiProps = new Properties（）; 
 jndiProps.put（java.naming.factory.initial，com.sun.enterprise.naming.impl.SerialInitContextFactory）; 
 jndiProps.put（java.naming.factory.url.pkgs，com.sun.enterprise.naming）; 
 jndiProps.put（java.naming.factory.state，com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl）; 
 jndiProps.setProperty（org.omg.CORBA.ORBInitialHost，x.x.x.x）; 
 jndiProps.setProperty（org.omg.CORBA.ORBInitialPort，3700）; 
 InitialContext ctx = new InitialContext（jndiProps）; 
 LanguageDirBeanRemote bean =（LanguageDirBeanRemote）ctx.lookup（java：global / ...）; 
 ArrayList< LanguageDirEntity>元素= bean.readDirectory（）; 
 System.out.println（这里我得到错误：+ elements.get（0）.getContent（））; 
} finally {
 Thread.currentThread（）。setContextClassLoader（thatLoader）; 
}

编辑3
我打开了一个 bug

解决方案

谢谢大家。我终于解决了它。我正在写我如何理解它。有两种方法可以将gf-client与osgi客户端一起使用：


  1. 不是官方的方式 - 通过glassfish捆绑并通过手动方式安装osgi api。

  2. 官方方式 - 将glassfish / lib / gf-client.jar和glassfish / modules复制到客户端和classpath中添加gf-clinet.jar。 b

我不知道怎么做，我是用第一种方法做的。我不能说错，因为glassfish本身就是osgi。当我以第二种方式完成这个问题时，这个问题就消失了。所以当你从java classpath和osgi bundle加载时，问题出现在不同的类加载器中。


I have an OSGi application. Working with EJB context.lookup I had to set Thread context class loader as bundle class loader in order to be able to cast. Like this:

Thread.currentThread().setContextClassLoader(getClass().getClassLoader());
Entity entity=bean.getOne();
System.out.println(entity.getClass().getClassLoader());

output is

org.apache.felix.framework.BundleWiringImpl@7468776f

This code works. The problem that I can't cast if I have ArrayList

Thread.currentThread().setContextClassLoader(getClass().getClassLoader());
ArrayList<Entity> entities=bean.getMany();

This code returns ClassCastException.

Checking 

ArrayList<Entity> temp=new ArrayList<Entity>();
System.out.println(temp.getClass().getClassLoader());

returns NULL - it means bootstrap class. How can it be fixed?

EDIT:

The most interesting, that ArrayList with String works, classic array works, but ArrayList and ArrayList with Entiry don't work.

Class Bean {
....
  @Override //THIS DOESN'T WORK
    public ArrayList<Entity> readMany() {
        Entity dir1=new Entity();
        dir1.setContent("1 test");
        Entity dir2=new Entity();
        dir2.setContent("2 test");
        ArrayList<Entity> result=new ArrayList<>();
        result.add(dir1);result.add(dir2);
        return result;
    }

    @Override //THIS WORKS
    public ArrayList<String> readMany2() {
        String str1=new String("1 test");
        String str2=new String("2 test");
        ArrayList<String> result=new ArrayList<>();
        result.add(str1);
        result.add(str2);
        return result; 
    }

@Override //THIS WORKS
public Entity[] readArray() {
    ArrayList<Entity> al=readMany();
    Entity[] ar=new Entity[al.size()];
    for (int i = 0; i < al.size(); i++) {
        ar[i]=al.get(i);
    }
    return ar;
}

@Override //THIS DOESN'T WORK
public ArrayList readSimpleArrayList() {
    ArrayList<Entity> gal=readMany();
    ArrayList al= new ArrayList();
    for (Entity obj : gal) {
        al.add(obj);
    }
    return al;
}
...
}

Here is the log

java.lang.ClassCastException: com.test.cmn.shd.base.dir.language.LanguageDirEntity cannot be cast to com.test.cmn.shd.base.dir.language.LanguageDirEntity at com.test.cmn.dt.base.Activator.start(Activator.java:83) at org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:645) at org.apache.felix.framework.Felix.activateBundle(Felix.java:1977) at org.apache.felix.framework.Felix.startBundle(Felix.java:1895) at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:944) at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:931) at com.test.cmn.dt.loader.LoaderModel.startCoreModule(LoaderModel.java:149) at com.test.cmn.dt.loader.LoaderModel.access$100(LoaderModel.java:39) at com.test.cmn.dt.loader.LoaderModel$InstallAndStartModuleWorker.doInBackground(LoaderModel.java:79) at com.test.cmn.dt.loader.LoaderModel$InstallAndStartModuleWorker.doInBackground(LoaderModel.java:73) at javax.swing.SwingWorker$1.call(SwingWorker.java:296) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at javax.swing.SwingWorker.run(SwingWorker.java:335) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:744)

EDIT 2 - FULL CODE. This code is executed on client computer. JavaEE (GF4) is running on server. There are three osgi bundles:for server,for client and shared. The copy of shared is both on server and on clients and contains LanguageDirBeanRemote and LanguageDirEntity.

ClassLoader thatLoader = Thread.currentThread().getContextClassLoader();
Thread.currentThread().setContextClassLoader(getClass().getClassLoader());
try {
       Properties jndiProps = new Properties();
       jndiProps.put("java.naming.factory.initial", "com.sun.enterprise.naming.impl.SerialInitContextFactory");
       jndiProps.put("java.naming.factory.url.pkgs", "com.sun.enterprise.naming");
       jndiProps.put("java.naming.factory.state", "com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl");
       jndiProps.setProperty("org.omg.CORBA.ORBInitialHost", "x.x.x.x");
       jndiProps.setProperty("org.omg.CORBA.ORBInitialPort", "3700");
       InitialContext ctx = new InitialContext(jndiProps);
       LanguageDirBeanRemote bean=(LanguageDirBeanRemote)ctx.lookup("java:global/...");
       ArrayList<LanguageDirEntity> elements=bean.readDirectory();
      System.out.println("HERE I GET THE ERROR:"+elements.get(0).getContent());
} finally {
Thread.currentThread().setContextClassLoader(thatLoader);
}

EDIT 3 I opened a bug

解决方案

Thank you everybody. I've finally solved it. I'm writing how as I understand it. There are two ways to use gf-client with osgi client:

  1. Not official way - take glassfish bundles and manually install them via osgi api.
  2. Official way - copy glassfish/lib/gf-client.jar and glassfish/modules to client and in classpath add gf-clinet.jar.

I don't know how, I did by the first way. I can't call it wrong, because glassfish is osgi itself. When I did it by the second way this problem disappeared. So the problem was in different classloaders when you load from java classpath and from osgi bundle.

这篇关于OSGi客户端从JavaEE服务器访问EJB的RMI ClassCastException的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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