How to package an Apache CXF application into a monolithic JAR with the Maven "shade" plugin

Question

I am writing a console-based Java application, intended to be run by cron in a batch-processing manner. The batch-processing application makes calls to a SOAP web service, using the Apache CXF framework for JAX-WS.

To make deployment easier, and to prevent CLASSPATH issues, I would like to bundle up the application (with all its dependencies) into a single monolithic JAR file... using the "shade" plugin for Maven.

My application works just fine when I run it from my Eclipse workspace. However, when I try executing the shaded JAR file I get a stacktrace such as the following:

org.apache.cxf.service.factory.ServiceConstructionException: Could not resolve a binding for null 
            at org.apache.cxf.frontend.AbstractWSDLBasedEndpointFactory.createBindingInfo(AbstractWSDLBasedEndpointFactory.java:404) 
            at org.apache.cxf.frontend.AbstractWSDLBasedEndpointFactory.createEndpointInfo(AbstractWSDLBasedEndpointFactory.java:258) 
            at org.apache.cxf.frontend.AbstractWSDLBasedEndpointFactory.createEndpoint(AbstractWSDLBasedEndpointFactory.java:146) 
            at org.apache.cxf.frontend.ClientFactoryBean.create(ClientFactoryBean.java:52) 
            at org.apache.cxf.frontend.ClientProxyFactoryBean.create(ClientProxyFactoryBean.java:102) 
            at org.apache.cxf.jaxws.JaxWsProxyFactoryBean.create(JaxWsProxyFactoryBean.java:115) 
            at com.example.gui.domain.Session.getService(Session.java:145) 
            at com.example.gui.domain.service.soap.AbstractServiceImpl.<init>(AbstractServiceImpl.java:23) 
            at com.example.gui.domain.service.soap.GetUserConsoleOrgsImpl.<init>(GetUserConsoleOrgsImpl.java:14) 
            at com.example.gui.domain.service.ServiceFactory.getGetUserConsoleOrgsService(ServiceFactory.java:443) 
            at com.example.gui.domain.AccessManager.getOrgs(AccessManager.java:62) 
            at com.example.gui.windows.ConsoleApplet.login (ConsoleApplet.java:1253) 
            at com.example.gui.windows.ConsoleApplet.init(ConsoleApplet.java:1227) 
            at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source) 
            at java.lang.Thread.run(Unknown Source) 
Caused by: org.apache.cxf.BusException: No binding factory for namespace http://schemas.xmlsoap.org/soap/ registered. 
            at org.apache.cxf.binding.BindingFactoryManagerImpl.getBindingFactory(BindingFactoryManagerImpl.java:91) 
            at org.apache.cxf.frontend.AbstractWSDLBasedEndpointFactory.createBindingInfo(AbstractWSDLBasedEndpointFactory.java:394) 
            ... 14 more 
java.lang.NullPointerException 
            at com.example.gui.domain.service.soap.GetUserConsoleOrgsImpl.getUserConsoleOrgs(GetUserConsoleOrgsImpl.java:29) 
            at com.example.gui.domain.AccessManager.getOrgs(AccessManager.java:64) 
            at com.example.gui.windows.ConsoleApplet.login (ConsoleApplet.java:1253) 
            at com.example.gui.windows.ConsoleApplet.init(ConsoleApplet.java:1227) 
            at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source) 
            at java.lang.Thread.run(Unknown Source) 

事实上,如果你看看这个讨论板的消息,我就遇到了这个家伙所遇到的完全相同的问题.正如另一个人在那个帖子中指出的那样,我的问题可能在于Maven"shade"插件.

Apache CXF由许多JAR文件依赖项组成,显然这些JAR中不止一个依赖于其META-INF目录中的内容.Maven"shade"插件显然正在将所有这些META-INF目录折叠成一个,并覆盖必要的文件而不是将它们合并在一起.

该讨论主题中的某个人提供了这个Maven POM文件的链接,显示有配置选项和变换器,用于使"shade"插件正确合并这些CXF依赖项.我将这些设置插入到我自己的POM中,如下所示:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-shade-plugin</artifactId>
    <version>1.4</version>
    <executions>
        <execution>
            <phase>package</phase>
            <goals>
                <goal>shade</goal>
            </goals>
            <configuration>
                <transformers>
                    <transformer
                        implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                        <mainClass>com.example.MainClass</mainClass>
                    </transformer>
                    <transformer
                        implementation="org.apache.maven.plugins.shade.resource.ApacheNoticeResourceTransformer">
                        <projectName>Apache CXF</projectName>
                    </transformer>
                    <transformer
                        implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                        <resource>META-INF/spring.handlers</resource>
                    </transformer>
                    <transformer
                        implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                        <resource>META-INF/services/com.sun.tools.xjc.Plugin</resource>
                    </transformer>
                    <transformer
                        implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                        <resource>META-INF/spring.schemas</resource>
                    </transformer>
                    <transformer
                        implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                        <resource>META-INF/cxf/cxf.extension</resource>
                    </transformer>
                    <transformer
                        implementation="org.apache.maven.plugins.shade.resource.XmlAppendingTransformer">
                        <resource>META-INF/extensions.xml</resource>
                    </transformer>
                    <transformer
                        implementation="org.apache.maven.plugins.shade.resource.XmlAppendingTransformer">
                        <resource>META-INF/cxf/extensions.xml</resource>
                    </transformer>
                    <transformer
                        implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                        <resource>META-INF/cxf/bus-extensions.txt</resource>
                    </transformer>
                    <transformer
                        implementation="org.apache.maven.plugins.shade.resource.XmlAppendingTransformer">
                        <resource>META-INF/cxf/bus-extensions.xml</resource>
                    </transformer>
                    <transformer
                        implementation="org.apache.maven.plugins.shade.resource.XmlAppendingTransformer">
                        <resource>META-INF/wsdl.plugin.xml</resource>
                    </transformer>
                    <transformer
                        implementation="org.apache.maven.plugins.shade.resource.XmlAppendingTransformer">
                        <resource>META-INF/tools.service.validator.xml</resource>
                    </transformer>
                    <transformer implementation="org.apache.cxf.maven.PluginTransformer">
                        <resource>META-INF/tools-plugin.xml</resource>
                    </transformer>
                    <transformer
                        implementation="org.apache.maven.plugins.shade.resource.XmlAppendingTransformer">
                        <resource>META-INF/cxf/java2wsbeans.xml</resource>
                    </transformer>
                    <transformer implementation="org.apache.cxf.maven.CXFAllTransformer" />
                </transformers>
            </configuration>
        </execution>
    </executions>
</plugin>

但是,我找不到这些设置正在做什么的任何真实解释...并且在启用调试输出的情况下运行Maven时出现以下错误:

[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1:14.357s
[INFO] Finished at: Tue Jul 26 11:10:43 EDT 2011
[INFO] Final Memory: 18M/59M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-shade-plugin:1.4:shade (default) on project salestax-poster: Unable to parse configuration of mojo org.apache.maven.plugins:maven-shade-plugin:1.4:shade: ClassNotFoundException: Class name which was explicitly given in configuration using 'implementation' attribute: 'org.apache.cxf.maven.PluginTransformer' cannot be loaded -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-shade-plugin:1.4:shade (default) on project salestax-poster: Unable to parse configuration of mojo org.apache.maven.plugins:maven-shade-plugin:1.4:shade: ClassNotFoundException: Class name which was explicitly given in configuration using 'implementation' attribute: 'org.apache.cxf.maven.PluginTransformer' cannot be loaded
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:221)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
...

它似乎抱怨它找不到org.apache.cxf.maven.PluginTransformer类,它似乎存在于cxf-buildtools包中.但是,当我将该包添加到POM的依赖项时,我在构建过程中又出现了另一个错误:

Jul 26, 2011 10:44:02 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.apache.cxf.bus.spring.BusApplicationContext@3aa42c31: display name [org.apache.cxf.bus.spring.BusApplicationContext@3aa42c31]; startup date [Tue Jul 26 10:44:02 EDT 2011]; root of context hierarchy
Jul 26, 2011 10:44:02 AM org.apache.cxf.bus.spring.BusApplicationContext getConfigResources
INFO: No cxf.xml configuration file detected, relying on defaults.
Jul 26, 2011 10:44:02 AM org.springframework.context.support.AbstractApplicationContext obtainFreshBeanFactory
INFO: Bean factory for application context [org.apache.cxf.bus.spring.BusApplicationContext@3aa42c31]: org.springframework.beans.factory.support.DefaultListableBeanFactory@47fe1e26
Jul 26, 2011 10:44:02 AM org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@47fe1e26: defining beans [cxf,org.apache.cxf.bus.spring.BusApplicationListener,org.apache.cxf.bus.spring.BusWiringBeanFactoryPostProcessor,org.apache.cxf.bus.spring.Jsr250BeanPostProcessor,org.apache.cxf.bus.spring.BusExtensionPostProcessor,org.apache.cxf.resource.ResourceManager,org.apache.cxf.configuration.Configurer,org.apache.cxf.binding.BindingFactoryManager,org.apache.cxf.transport.DestinationFactoryManager,org.apache.cxf.transport.ConduitInitiatorManager,org.apache.cxf.wsdl.WSDLManager,org.apache.cxf.phase.PhaseManager,org.apache.cxf.workqueue.WorkQueueManager,org.apache.cxf.buslifecycle.BusLifeCycleManager,org.apache.cxf.endpoint.ServerRegistry,org.apache.cxf.endpoint.ServerLifeCycleManager,org.apache.cxf.endpoint.ClientLifeCycleManager,org.apache.cxf.transports.http.QueryHandlerRegistry,org.apache.cxf.endpoint.EndpointResolverRegistry,org.apache.cxf.headers.HeaderManager,org.apache.cxf.catalog.OASISCatalogManager,org.apache.cxf.endpoint.ServiceContractResolverRegistry]; root of factory hierarchy
[DEBUG] 
java.lang.AbstractMethodError: org.apache.xerces.dom.ElementNSImpl.setUserData(Ljava/lang/String;Ljava/lang/Object;Lorg/w3c/dom/UserDataHandler;)Ljava/lang/Object;
    at org.apache.cxf.tools.validator.internal.Stax2DOM.startElement(Stax2DOM.java:173)
    at org.apache.cxf.tools.validator.internal.Stax2DOM.getDocument(Stax2DOM.java:135)
    at org.apache.cxf.tools.validator.internal.Stax2DOM.getDocument(Stax2DOM.java:95)
    at org.apache.cxf.tools.validator.internal.Stax2DOM.getDocument(Stax2DOM.java:76)
    at org.apache.cxf.tools.validator.internal.WSDL11Validator.getWSDLDoc(WSDL11Validator.java:91)
    at org.apache.cxf.tools.validator.internal.WSDL11Validator.isValid(WSDL11Validator.java:111)
    at org.apache.cxf.tools.wsdlto.frontend.jaxws.wsdl11.JAXWSDefinitionBuilder.validate(JAXWSDefinitionBuilder.java:201)
    at org.apache.cxf.tools.wsdlto.frontend.jaxws.wsdl11.JAXWSDefinitionBuilder.validate(JAXWSDefinitionBuilder.java:61)
    at org.apache.cxf.tools.wsdlto.WSDLToJavaContainer.execute(WSDLToJavaContainer.java:132)
    at org.apache.cxf.tools.wsdlto.WSDLToJavaContainer.execute(WSDLToJavaContainer.java:238)
    at org.apache.cxf.tools.common.toolspec.ToolRunner.runTool(ToolRunner.java:83)
    at org.apache.cxf.tools.wsdlto.WSDLToJava.run(WSDLToJava.java:103)
    at org.apache.cxf.maven_plugin.WSDL2JavaMojo.processWsdl(WSDL2JavaMojo.java:360)
    at org.apache.cxf.maven_plugin.WSDL2JavaMojo.execute(WSDL2JavaMojo.java:257)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:319)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
    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 org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
Jul 26, 2011 10:44:03 AM org.springframework.context.support.AbstractApplicationContext doClose
INFO: Closing org.apache.cxf.bus.spring.BusApplicationContext@3aa42c31: display name [org.apache.cxf.bus.spring.BusApplicationContext@3aa42c31]; startup date [Tue Jul 26 10:44:02 EDT 2011]; root of context hierarchy
Jul 26, 2011 10:44:03 AM org.springframework.beans.factory.support.DefaultSingletonBeanRegistry destroySingletons
INFO: Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@47fe1e26: defining beans [cxf,org.apache.cxf.bus.spring.BusApplicationListener,org.apache.cxf.bus.spring.BusWiringBeanFactoryPostProcessor,org.apache.cxf.bus.spring.Jsr250BeanPostProcessor,org.apache.cxf.bus.spring.BusExtensionPostProcessor,org.apache.cxf.resource.ResourceManager,org.apache.cxf.configuration.Configurer,org.apache.cxf.binding.BindingFactoryManager,org.apache.cxf.transport.DestinationFactoryManager,org.apache.cxf.transport.ConduitInitiatorManager,org.apache.cxf.wsdl.WSDLManager,org.apache.cxf.phase.PhaseManager,org.apache.cxf.workqueue.WorkQueueManager,org.apache.cxf.buslifecycle.BusLifeCycleManager,org.apache.cxf.endpoint.ServerRegistry,org.apache.cxf.endpoint.ServerLifeCycleManager,org.apache.cxf.endpoint.ClientLifeCycleManager,org.apache.cxf.transports.http.QueryHandlerRegistry,org.apache.cxf.endpoint.EndpointResolverRegistry,org.apache.cxf.headers.HeaderManager,org.apache.cxf.catalog.OASISCatalogManager,org.apache.cxf.endpoint.ServiceContractResolverRegistry]; root of factory hierarchy
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 8.152s
[INFO] Finished at: Tue Jul 26 10:44:03 EDT 2011
[INFO] Final Memory: 10M/59M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.cxf:cxf-codegen-plugin:2.2:wsdl2java (generate-sources) on project salestax-poster: org.apache.xerces.dom.ElementNSImpl.setUserData(Ljava/lang/String;Ljava/lang/Object;Lorg/w3c/dom/UserDataHandler;)Ljava/lang/Object; -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.cxf:cxf-codegen-plugin:2.2:wsdl2java (generate-sources) on project salestax-poster: org.apache.xerces.dom.ElementNSImpl.setUserData(Ljava/lang/String;Ljava/lang/Object;Lorg/w3c/dom/UserDataHandler;)Ljava/lang/Object;
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:217)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:319)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
    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 org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
Caused by: org.apache.maven.plugin.MojoExecutionException: org.apache.xerces.dom.ElementNSImpl.setUserData(Ljava/lang/String;Ljava/lang/Object;Lorg/w3c/dom/UserDataHandler;)Ljava/lang/Object;
    at org.apache.cxf.maven_plugin.WSDL2JavaMojo.processWsdl(WSDL2JavaMojo.java:363)
    at org.apache.cxf.maven_plugin.WSDL2JavaMojo.execute(WSDL2JavaMojo.java:257)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
    ... 19 more
Caused by: java.lang.AbstractMethodError: org.apache.xerces.dom.ElementNSImpl.setUserData(Ljava/lang/String;Ljava/lang/Object;Lorg/w3c/dom/UserDataHandler;)Ljava/lang/Object;
    at org.apache.cxf.tools.validator.internal.Stax2DOM.startElement(Stax2DOM.java:173)
    at org.apache.cxf.tools.validator.internal.Stax2DOM.getDocument(Stax2DOM.java:135)
    at org.apache.cxf.tools.validator.internal.Stax2DOM.getDocument(Stax2DOM.java:95)
    at org.apache.cxf.tools.validator.internal.Stax2DOM.getDocument(Stax2DOM.java:76)
    at org.apache.cxf.tools.validator.internal.WSDL11Validator.getWSDLDoc(WSDL11Validator.java:91)
    at org.apache.cxf.tools.validator.internal.WSDL11Validator.isValid(WSDL11Validator.java:111)
    at org.apache.cxf.tools.wsdlto.frontend.jaxws.wsdl11.JAXWSDefinitionBuilder.validate(JAXWSDefinitionBuilder.java:201)
    at org.apache.cxf.tools.wsdlto.frontend.jaxws.wsdl11.JAXWSDefinitionBuilder.validate(JAXWSDefinitionBuilder.java:61)
    at org.apache.cxf.tools.wsdlto.WSDLToJavaContainer.execute(WSDLToJavaContainer.java:132)
    at org.apache.cxf.tools.wsdlto.WSDLToJavaContainer.execute(WSDLToJavaContainer.java:238)
    at org.apache.cxf.tools.common.toolspec.ToolRunner.runTool(ToolRunner.java:83)
    at org.apache.cxf.tools.wsdlto.WSDLToJava.run(WSDLToJava.java:103)
    at org.apache.cxf.maven_plugin.WSDL2JavaMojo.processWsdl(WSDL2JavaMojo.java:360)
    ... 22 more

有没有人在Maven阴影JAR的上下文中使用Apache CXF,并且可以提供一些关于如何正常工作的指导？

Answer 1

解决方案是将cxf-buildtools的依赖项添加到插件元素.

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-shade-plugin</artifactId>
        <version>1.4</version>
            <executions>
                <execution>
                    <phase>package</phase>
                    <goals>
                        <goal>shade</goal>
                    </goals>
                    <configuration>
                        <transformers>
                            <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                <mainClass>## you name class name ##</mainClass>
                            </transformer>
                            <transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                                <resource>META-INF/spring.handlers</resource>
                            </transformer>
                            <transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                                <resource>META-INF/spring.schemas</resource>
                            </transformer>
                            <transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                                <resource>META-INF/services/com.sun.tools.xjc.Plugin</resource>
                            </transformer>
                            <transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                                <resource>META-INF/cxf/cxf.extension</resource>
                            </transformer>
                            <transformer implementation="org.apache.maven.plugins.shade.resource.XmlAppendingTransformer">
                                <resource>META-INF/extensions.xml</resource>
                            </transformer>
                            <transformer implementation="org.apache.maven.plugins.shade.resource.XmlAppendingTransformer">
                                <resource>META-INF/cxf/extensions.xml</resource>
                            </transformer>
                            <transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                                <resource>META-INF/cxf/bus-extensions.txt</resource>
                            </transformer>
                            <transformer implementation="org.apache.maven.plugins.shade.resource.XmlAppendingTransformer">
                                <resource>META-INF/cxf/bus-extensions.xml</resource>
                            </transformer>
                            <transformer implementation="org.apache.maven.plugins.shade.resource.XmlAppendingTransformer">
                                <resource>META-INF/wsdl.plugin.xml</resource>
                            </transformer>
                            <transformer implementation="org.apache.maven.plugins.shade.resource.XmlAppendingTransformer">
                                <resource>META-INF/tools.service.validator.xml</resource>
                            </transformer>
                            <transformer implementation="org.apache.cxf.maven.PluginTransformer">
                                <resource>META-INF/tools-plugin.xml</resource>
                            </transformer>
                            <transformer implementation="org.apache.maven.plugins.shade.resource.XmlAppendingTransformer">
                                <resource>META-INF/cxf/java2wsbeans.xml</resource>
                            </transformer>
                            <transformer implementation="org.apache.cxf.maven.CXFAllTransformer" />
                        </transformers>
                        <shadedArtifactAttached>true</shadedArtifactAttached>
                        <shadedClassifierName>executable</shadedClassifierName>
                    </configuration>
                </execution>
            </executions>
            <dependencies>
                <dependency>
                    <groupId>org.apache.cxf</groupId>
                    <artifactId>cxf-buildtools</artifactId>
                    <version>2.2.12</version>
                    <type>jar</type>
                    <scope>compile</scope>
                </dependency>
            </dependencies>
        </plugin>

Answer 2

在我的情况下,我只需要添加:

<transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
     <resource>META-INF/cxf/bus-extensions.txt</resource>
</transformer>

如果你看一下这个带有和不带变压器标签的文件,就会有很大的不同(只有一行对~50行),特别是行:

org.apache.cxf.binding.soap.SoapBindingFactory::true
org.apache.cxf.binding.soap.SoapTransportFactory::true

我不相信这是导致问题的原因.

Answer 3

我或多或少解决了这个问题。

Maven“shade”插件带有“转换器”的概念，它使您能够将冲突的文件合并到整体 JAR 中，而不是让一个文件覆盖另一个文件。变压器有不同类型......最常见的是：

• org.apache.maven.plugins.shade.resource.AppendingTransformer-- 只需将一个文本文件附加到另一个文本文件的末尾
• org.apache.maven.plugins.shade.resource.XmlAppendingTransformer-- 将 XML 附加在一起，同时保持格式正常

在上面的 POM 片段中，我从该讨论板线程中提供的示例中获取了变压器列表。它包括两个变压器，这两个变压器不属于开箱即用的默认“shade”插件：

• org.apache.cxf.maven.PluginTransformer
• org.apache.cxf.maven.CXFAllTransformer

显然，这两个是 CXF 特定的附加组件，它们不附带“shade”插件，但必须由 CXF JAR 单独提供。

我的“解决方案”是不完整的，因为我无法弄清楚如何使这些依赖项就位。它们似乎是cxf-buildtoolsMaven 依赖包的一部分...但正如上面的问题文档，无论我如何尝试将该依赖项插入到我的 POM 中，我都会遇到问题。

然而，实际上，我的解决方案是简单地从“shade”插件配置中完全删除这两个变压器。我的阴影 JAR 应用程序在没有它们的情况下工作得很好。也许这两个特定的变压器在特殊的边缘情况下发挥作用，但对于普通的 CXF 服务调用，您似乎可以忽略它们。