在osgi中使用corba时获取ClassNotFound异常

Question

我想将 corba 服务封装到 osgi 包中。我使用 karaf 作为 osgi 容器，使用 openorb 作为 orb 实现和蓝图来注册 osgi 服务。但是当我将我的 corba 功能安装到 karaf 时，总是得到 ClassNotFound 异常。像这样的异常堆栈：

org.omg.CORBA.INITIALIZE: can't instantiate ORB implementation org.openorb.CORBA.ORB
at org.omg.CORBA.ORB.init_orb(Unknown Source)[:1.6.0_32]
at org.omg.CORBA.ORB.init(Unknown Source)[:1.6.0_32]
....
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)[:1.6.0_32]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)[:1.6.0_32]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)[:1.6.0_32]
at java.lang.reflect.Method.invoke(Method.java:597)[:1.6.0_32]
at org.apache.aries.blueprint.utils.ReflectionUtils.invoke(ReflectionUtils.java:226)[10:org.apache.aries.blueprint:0.3.1]
at org.apache.aries.blueprint.container.BeanRecipe.invoke(BeanRecipe.java:824)[10:org.apache.aries.blueprint:0.3.1]
at org.apache.aries.blueprint.container.BeanRecipe.runBeanProcInit(BeanRecipe.java:636)[10:org.apache.aries.blueprint:0.3.1]
at org.apache.aries.blueprint.container.BeanRecipe.internalCreate(BeanRecipe.java:724)[10:org.apache.aries.blueprint:0.3.1]
at org.apache.aries.blueprint.di.AbstractRecipe.create(AbstractRecipe.java:64)[10:org.apache.aries.blueprint:0.3.1]
at org.apache.aries.blueprint.container.BlueprintRepository.createInstances(BlueprintRepository.java:219)[10:org.apache.aries.blueprint:0.3.1]
at org.apache.aries.blueprint.container.BlueprintRepository.createAll(BlueprintRepository.java:147)[10:org.apache.aries.blueprint:0.3.1]
at org.apache.aries.blueprint.container.BlueprintContainerImpl.instantiateEagerComponents(BlueprintContainerImpl.java:640)[10:org.apache.aries.blueprint:0.3.1]
at org.apache.aries.blueprint.container.BlueprintContainerImpl.doRun(BlueprintContainerImpl.java:331)[10:org.apache.aries.blueprint:0.3.1]
at org.apache.aries.blueprint.container.BlueprintContainerImpl.run(BlueprintContainerImpl.java:227)[10:org.apache.aries.blueprint:0.3.1]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)[:1.6.0_32]
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)[:1.6.0_32]
at java.util.concurrent.FutureTask.run(FutureTask.java:138)[:1.6.0_32]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:98)[:1.6.0_32]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:206)[:1.6.0_32]
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)[:1.6.0_32]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)[:1.6.0_32]
at java.lang.Thread.run(Thread.java:662)[:1.6.0_32]
Caused by: java.lang.ClassNotFoundException: org.openorb.CORBA.ORB
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)[:1.6.0_32]
at java.security.AccessController.doPrivileged(Native Method)[:1.6.0_32]
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)[:1.6.0_32]
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)[:1.6.0_32]
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)[:1.6.0_32]
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)[:1.6.0_32]

Answer 1

自己解决了这个问题，使用如下方式：

ClassLoader tccl = Thread.currentThread().getContextClassLoader();
try {
Thread.currentThread().setContextClassLoader(getClass().getClassLoader());
/*
 * Start threads, or establish connections, here, now
 */
} finally {
Thread.currentThread().setContextClassLoader(tccl);
}

Better handling of Thread Context ClassLoader in OSGi

Answer 2

我认为它只是错过了 openorb 依赖项。是否导入 org.openorb 包？

如果你忘记了，通常你会得到编译时错误，但这似乎是一个 Class.forname，所以它只在运行时失败。