eclipse - 创建 Web 服务时的 LinkageError(Tomcat、CXF 和 Eclipse)

Question

我想在 Eclipse (Helios J2EE) 中使用 Apache CXF 2.3.2 和 Tomcat 7 创建一个简单的 Web 服务。但是，当我使用“新建 Web 服务”向导时，在创建 WSDL 时出现以下错误:

java.lang.LinkageError: JAXB 2.1 API is being loaded from the bootstrap classloader, but this RI (from jar:file:/C:/Users/me/apache-cxf-2.3.2/lib/jaxb-impl-2.2.1.1.jar!/com/sun/xml/bind/v2/model/impl/ModelBuilder.class) needs 2.2 API. Use the endorsed directory mechanism to place jaxb-api.jar in the bootstrap classloader. (See http://java.sun.com/j2se/1.6.0/docs/guide/standards/)
at com.sun.xml.bind.v2.model.impl.ModelBuilder.<clinit>(ModelBuilder.java:173)
at com.sun.xml.bind.v2.runtime.JAXBContextImpl.getTypeInfoSet(JAXBContextImpl.java:456)
at com.sun.xml.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:302)
at com.sun.xml.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build(JAXBContextImpl.java:1140)
at com.sun.xml.bind.v2.ContextFactory.createContext(ContextFactory.java:154)
at com.sun.xml.bind.v2.ContextFactory.createContext(ContextFactory.java:121)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:210)
at javax.xml.bind.ContextFinder.find(ContextFinder.java:368)
at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:574)
at org.apache.cxf.jaxb.JAXBDataBinding.createContext(JAXBDataBinding.java:557)
at org.apache.cxf.jaxb.JAXBDataBinding.createJAXBContextAndSchemas(JAXBDataBinding.java:497)
at org.apache.cxf.jaxb.JAXBDataBinding.initialize(JAXBDataBinding.java:324)
at org.apache.cxf.service.factory.AbstractServiceFactoryBean.initializeDataBindings(AbstractServiceFactoryBean.java:87)
at org.apache.cxf.service.factory.ReflectionServiceFactoryBean.buildServiceFromClass(ReflectionServiceFactoryBean.java:445)
at org.apache.cxf.service.factory.ReflectionServiceFactoryBean.initializeServiceModel(ReflectionServiceFactoryBean.java:508)
at org.apache.cxf.service.factory.ReflectionServiceFactoryBean.create(ReflectionServiceFactoryBean.java:245)
at org.apache.cxf.frontend.AbstractWSDLBasedEndpointFactory.createEndpoint(AbstractWSDLBasedEndpointFactory.java:101)
at org.apache.cxf.frontend.AbstractServiceFactory.createService(AbstractServiceFactory.java:78)
at org.apache.cxf.tools.java2wsdl.processor.JavaToWSDLProcessor.process(JavaToWSDLProcessor.java:101)
at org.apache.cxf.tools.java2ws.JavaToWSContainer.processWSDL(JavaToWSContainer.java:110)
at org.apache.cxf.tools.java2ws.JavaToWSContainer.execute(JavaToWSContainer.java:75)
at org.apache.cxf.tools.common.toolspec.ToolRunner.runTool(ToolRunner.java:103)
at org.apache.cxf.tools.common.toolspec.ToolRunner.runTool(ToolRunner.java:58)
at org.apache.cxf.tools.common.toolspec.ToolRunner.runTool(ToolRunner.java:40)
at org.apache.cxf.tools.java2ws.JavaToWS.run(JavaToWS.java:77)
at org.apache.cxf.tools.java2ws.JavaToWS.main(JavaToWS.java:45)

我发现 some posts 建议在 %JAVA_HOME%/lib/endorsed 中复制 jaxb-api-2.2.1.jar，但这对我不起作用。 ..

有什么想法吗？谢谢

Answer 1

好的，一些信息可能会帮助你自己解决这个问题:

java.lang.LinkageError: JAXB 2.1 API is being loaded from the bootstrap classloader, but this RI (from jar:file:/C:/Users/me/apache-cxf-2.3.2/lib/jaxb-impl-2.2.1.1.jar!/com/sun/xml/bind/v2/model/impl/ModelBuilder.class) needs 2.2 API. Use the endorsed directory mechanism to place jaxb-api.jar in the bootstrap classloader. (See http://java.sun.com/j2se/1.6.0/docs/guide/standards/)

1. 你知道什么是bootstrap classloader吗？它是一个“ super ”类加载器。如果您将 JAR 放入该类加载器中，您甚至可以覆盖 java.lang.* 类。它是所有 Java 应用程序中的第一个类加载器。这是一个强大的东西。

2. 让我们看看您的消息:

   JAXB 2.1 API is being loaded from the bootstrap classloader, but this RI ([...]) needs 2.2 API [...].

   您只需要更换 JAXB API 的版本，对吧？因此，检查您的 Bootstrap 类加载器上有什么(尝试打印所有 JAVA_* 变量和 Java 起始行以找到您的 Bootstrap )并找出错误所在。可能某些 JAR 具有旧版本的 JAXB，需要更换。仅此而已。