错误：java.lang.ClassCastException：类 org.apache.cxf.bus.spring.SpringBusFactory答案

【问题标题】：ERROR: java.lang.ClassCastException: class org.apache.cxf.bus.spring.SpringBusFactory错误：java.lang.ClassCastException：类 org.apache.cxf.bus.spring.SpringBusFactory
【发布时间】：2011-11-08 15:00:09
【问题描述】：

喂！

我正在尝试使用 CXF 创建一个 Web 服务客户端。我的应用程序在 OSGi 中。我使用 Felix 框架。

但是出现以下错误：

[main] ERROR org.apache.cxf.BusFactory - Failed to determine BusFactory implementation class name.
java.lang.ClassCastException: class org.apache.cxf.bus.spring.SpringBusFactory
    at java.lang.Class.asSubclass(Unknown Source)
    at org.apache.cxf.BusFactory.getBusFactoryClass(BusFactory.java:280)
    at org.apache.cxf.BusFactory.newInstance(BusFactory.java:207)
    at org.apache.cxf.BusFactory.newInstance(BusFactory.java:194)
    at org.apache.cxf.BusFactory.getDefaultBus(BusFactory.java:90)
    at org.apache.cxf.BusFactory.getThreadDefaultBus(BusFactory.java:137)
    at org.apache.cxf.BusFactory.getThreadDefaultBus(BusFactory.java:122)
    at org.apache.cxf.jaxws.spi.ProviderImpl.createServiceDelegate(ProviderImpl.java:89)
    at javax.xml.ws.Service.<init>(Service.java:36)
    at myorg.engine.test.mocks.soapservice.client.CHMService.<init>(CHMService.java:42)
    at myorg.engine.service.OSGiServiceTest.testSoapServiceMock(OSGiServiceTest.java:133)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.ops4j.pax.exam.raw.extender.intern.ProbeInvokerImpl.injectContextAndInvoke(ProbeInvokerImpl.java:112)
    at org.ops4j.pax.exam.raw.extender.intern.ProbeInvokerImpl.findAndInvoke(ProbeInvokerImpl.java:71)
    at org.ops4j.pax.exam.raw.extender.intern.ProbeInvokerImpl.call(ProbeInvokerImpl.java:58)
    at org.ops4j.pax.exam.nat.internal.NativeTestContainer.call(NativeTestContainer.java:83)
    at org.ops4j.pax.exam.spi.reactors.EagerSingleStagedReactor.invoke(EagerSingleStagedReactor.java:85)
    at org.ops4j.pax.exam.junit.JUnit4TestRunner$2.evaluate(JUnit4TestRunner.java:259)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
    at org.ops4j.pax.exam.junit.JUnit4TestRunner.run(JUnit4TestRunner.java:86)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

[main] ERROR org.apache.cxf.BusFactory - Failed to instantiate bus factory.
java.lang.ClassCastException: class org.apache.cxf.bus.spring.SpringBusFactory
    at java.lang.Class.asSubclass(Unknown Source)
    at org.apache.cxf.BusFactory.newInstance(BusFactory.java:218)
    at org.apache.cxf.BusFactory.newInstance(BusFactory.java:194)
    at org.apache.cxf.BusFactory.getDefaultBus(BusFactory.java:90)
    at org.apache.cxf.BusFactory.getThreadDefaultBus(BusFactory.java:137)
    at org.apache.cxf.BusFactory.getThreadDefaultBus(BusFactory.java:122)
    at org.apache.cxf.jaxws.spi.ProviderImpl.createServiceDelegate(ProviderImpl.java:89)
    at javax.xml.ws.Service.<init>(Service.java:36)
    at myorg.engine.test.mocks.soapservice.client.CHMService.<init>(CHMService.java:42)
    at myorg.engine.service.OSGiServiceTest.testSoapServiceMock(OSGiServiceTest.java:133)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.ops4j.pax.exam.raw.extender.intern.ProbeInvokerImpl.injectContextAndInvoke(ProbeInvokerImpl.java:112)
    at org.ops4j.pax.exam.raw.extender.intern.ProbeInvokerImpl.findAndInvoke(ProbeInvokerImpl.java:71)
    at org.ops4j.pax.exam.raw.extender.intern.ProbeInvokerImpl.call(ProbeInvokerImpl.java:58)
    at org.ops4j.pax.exam.nat.internal.NativeTestContainer.call(NativeTestContainer.java:83)
    at org.ops4j.pax.exam.spi.reactors.EagerSingleStagedReactor.invoke(EagerSingleStagedReactor.java:85)
    at org.ops4j.pax.exam.junit.JUnit4TestRunner$2.evaluate(JUnit4TestRunner.java:259)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
    at org.ops4j.pax.exam.junit.JUnit4TestRunner.run(JUnit4TestRunner.java:86)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
[org.ops4j.pax.exam.junit.JUnit4TestRunner] : Exception
org.ops4j.pax.exam.TestContainerException: java.lang.reflect.InvocationTargetException
    at org.ops4j.pax.exam.raw.extender.intern.ProbeInvokerImpl.injectContextAndInvoke(ProbeInvokerImpl.java:118)
    at org.ops4j.pax.exam.raw.extender.intern.ProbeInvokerImpl.findAndInvoke(ProbeInvokerImpl.java:71)
    at org.ops4j.pax.exam.raw.extender.intern.ProbeInvokerImpl.call(ProbeInvokerImpl.java:58)
    at org.ops4j.pax.exam.nat.internal.NativeTestContainer.call(NativeTestContainer.java:83)
    at org.ops4j.pax.exam.spi.reactors.EagerSingleStagedReactor.invoke(EagerSingleStagedReactor.java:85)
    at org.ops4j.pax.exam.junit.JUnit4TestRunner$2.evaluate(JUnit4TestRunner.java:259)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
    at org.ops4j.pax.exam.junit.JUnit4TestRunner.run(JUnit4TestRunner.java:86)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.ops4j.pax.exam.raw.extender.intern.ProbeInvokerImpl.injectContextAndInvoke(ProbeInvokerImpl.java:112)
    ... 20 more

Caused by: java.lang.RuntimeException: java.lang.ClassCastException: class org.apache.cxf.bus.spring.SpringBusFactory
    at org.apache.cxf.BusFactory.newInstance(BusFactory.java:224)
    at org.apache.cxf.BusFactory.newInstance(BusFactory.java:194)
    at org.apache.cxf.BusFactory.getDefaultBus(BusFactory.java:90)
    at org.apache.cxf.BusFactory.getThreadDefaultBus(BusFactory.java:137)
    at org.apache.cxf.BusFactory.getThreadDefaultBus(BusFactory.java:122)
    at org.apache.cxf.jaxws.spi.ProviderImpl.createServiceDelegate(ProviderImpl.java:89)
    at javax.xml.ws.Service.<init>(Service.java:36)
    at myorg.engine.test.mocks.soapservice.client.CHMService.<init>(CHMService.java:42)
    at myorg.engine.service.OSGiServiceTest.testSoapServiceMock(OSGiServiceTest.java:133)
    ... 25 more

Caused by: java.lang.ClassCastException: class org.apache.cxf.bus.spring.SpringBusFactory
    at java.lang.Class.asSubclass(Unknown Source)
    at org.apache.cxf.BusFactory.newInstance(BusFactory.java:218)
    ... 33 more

我说这可能是因为不同的 ClassLoader。有可能吗？

知道如何解决这个问题吗？

谢谢！

【问题讨论】：

标签： java web-services osgi webclient cxf

【解决方案1】：

是的，看起来您有两个 BusFactory 类定义。 SpringBusFactory 实现其中一个，而 asSubclass() 调用是在另一个上进行的。由于一个 BusFactory 与另一个不同，因此您将获得 CCE。查找包含 BusFactory 类的两个不同包。其中之一将由定义 SpringBusFactory 的包导入。

【讨论】：

Felix 中没有两个 BusFactory 类的实现。只有 cxf 捆绑包。而且我的包没有导入类 SpringBusFactory，只有 javax.xml.ws.Service 类。

【解决方案2】：

我认为“两个 BusFactory 类定义”是一个红鲱鱼。

不确定您使用的是哪个版本的 CXF（猜测是 2.4.2），但该代码在查找子类实现时尝试使用线程上下文类加载器执行 ServiceLoader 之类的事情。

我最好的猜测是 CXF 依赖于一些 Spring“魔法”，而您缺少提供它的包。查看 Karaf 的 CXF 功能，它有很多依赖项，检查并确保您拥有所有依赖项 - 此时使用安装了 CXF 功能的 karaf 可能会更容易尝试。

如果您使用的是 maven，可以通过以下方式访问功能文件：

    <dependency>
        <groupId>org.apache.cxf.karaf</groupId>
        <artifactId>apache-cxf</artifactId>
        <version>2.4.2</version>
        <type>xml</type>
        <classifier>features</classifier>
    </dependency>

一些关于总线配置的文档here

【讨论】：

我发现 SOAP 客户端在 OSGi 环境中不能与 CXF 一起使用。

【解决方案3】：

我过去曾在 pax-exam 中看到过类似的奇怪错误。这是否在“正常”OSGi 环境中的 pax-exam 之外运行？ Talend Service Factory (http://talend.com/products/tsf) 有几个在 OSGi 中运行的 CXF 客户端和服务示例（在单独的示例下载包中），它们都可以工作。

【讨论】：