单元测试中的IncompatibleClassChangeError异常导致CXF失败[关闭]

问题描述 投票：3回答：2

我有一个使用Spring-3.2.X和cxf-2.7.5的应用程序

我正在将cxf导入到我的spring的应用程序上下文中，如下所示：

<import resource="classpath:META-INF/cxf/cxf.xml" />
<import resource="classpath:cxf.xml" />

但是，当我运行测试时，我最终会遇到以下异常：

java.lang.IllegalStateException: Failed to load ApplicationContext
    at org.springframework.test.context.CacheAwareContextLoaderDelegate.loadContext(CacheAwareContextLoaderDelegate.java:99)
    at org.springframework.test.context.TestContext.getApplicationContext(TestContext.java:122)
    at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary(ServletTestExecutionListener.java:154)
    at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance(ServletTestExecutionListener.java:100)
    at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:312)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:211)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:288)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:284)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:88)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:160)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:74)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:202)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:65)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'cxf' defined in class path resource [META-INF/cxf/cxf.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.apache.cxf.bus.spring.SpringBus]: Constructor threw exception; nested exception is org.apache.cxf.bus.extension.ExtensionException: Could not load extension class org.apache.cxf.ws.policy.AssertionBuilderRegistryImpl.
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1037)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:983)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:487)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:296)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:293)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:628)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
    at org.springframework.test.context.web.AbstractGenericWebContextLoader.loadContext(AbstractGenericWebContextLoader.java:128)
    at org.springframework.test.context.web.AbstractGenericWebContextLoader.loadContext(AbstractGenericWebContextLoader.java:60)
    at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.delegateLoading(AbstractDelegatingSmartContextLoader.java:100)
    at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.loadContext(AbstractDelegatingSmartContextLoader.java:248)
    at org.springframework.test.context.CacheAwareContextLoaderDelegate.loadContextInternal(CacheAwareContextLoaderDelegate.java:64)
    at org.springframework.test.context.CacheAwareContextLoaderDelegate.loadContext(CacheAwareContextLoaderDelegate.java:91)
    ... 28 more
Caused by: org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.apache.cxf.bus.spring.SpringBus]: Constructor threw exception; nested exception is org.apache.cxf.bus.extension.ExtensionException: Could not load extension class org.apache.cxf.ws.policy.AssertionBuilderRegistryImpl.
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:163)
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:87)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1030)
    ... 44 more
Caused by: org.apache.cxf.bus.extension.ExtensionException: Could not load extension class org.apache.cxf.ws.policy.AssertionBuilderRegistryImpl.
    at org.apache.cxf.bus.extension.Extension.tryClass(Extension.java:173)
    at org.apache.cxf.bus.extension.Extension.getClassObject(Extension.java:185)
    at org.apache.cxf.bus.extension.ExtensionManagerImpl.activateAllByType(ExtensionManagerImpl.java:138)
    at org.apache.cxf.bus.extension.ExtensionManagerBus.<init>(ExtensionManagerBus.java:126)
    at org.apache.cxf.bus.extension.ExtensionManagerBus.<init>(ExtensionManagerBus.java:138)
    at org.apache.cxf.bus.spring.SpringBus.<init>(SpringBus.java:47)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:148)
    ... 46 more
Caused by: java.lang.IncompatibleClassChangeError: Implementing class
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
    at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
    at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
    at org.apache.cxf.bus.extension.Extension.tryClass(Extension.java:169)
    ... 56 more

从阅读What causes java.lang.IncompatibleClassChangeError?看起来像IncompatibleClassChangeError - 意味着我可能在我的类路径上有冲突的库版本。我无法从堆栈跟踪中看出哪些类/库被复制。

我的POM看起来像这样：

<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
                             http://maven.apache.org/maven-v4_0_0.xsd">

  <properties>
    <wicket.version>1.5.11</wicket.version>
    <spring.version>3.2.6.RELEASE</spring.version>
    <project.build.sourceEncoding>windows-1252</project.build.sourceEncoding>
    <netbeans.hint.deploy.server>Tomcat60</netbeans.hint.deploy.server>
    <bootClassPath>
      ${env.JRE_6_HOME}\lib\rt.jar;${env.JAVA_HOME}\lib\tools.jar;${env.JRE_6_HOME}\lib\jsse.jar;
    </bootClassPath>
    <toolsDir>${env.JAVA_HOME}\lib</toolsDir>
    <jsseDir>${env.JAVA_HOME}\jre\lib</jsseDir>
    <m2Repository>${env.USERPROFILE}/.m2/repository</m2Repository>
  </properties>

  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.6.2</version>
      </dependency>
      <dependency>
        <groupId>org.apache.wicket</groupId>
        <artifactId>wicket</artifactId>
        <version>${wicket.version}</version>
      </dependency>
      <dependency>
        <groupId>org.apache.wicket</groupId>
        <artifactId>wicket-core</artifactId>
        <version>${wicket.version}</version>
      </dependency>
      <dependency>
        <groupId>org.apache.wicket</groupId>
        <artifactId>wicket-extensions</artifactId>
        <version>${wicket.version}</version>
      </dependency>
      <dependency>
        <groupId>org.apache.wicket</groupId>
        <artifactId>wicket-datetime</artifactId>
        <version>${wicket.version}</version>
      </dependency>
      <dependency>
        <groupId>org.apache.wicket</groupId>
        <artifactId>wicket-spring</artifactId>
        <version>${wicket.version}</version>
       </dependency>
      <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>${spring.version}</version>
      </dependency>
      <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-beans</artifactId>
        <version>${spring.version}</version>
      </dependency>
      <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-aop</artifactId>
        <version>${spring.version}</version>
      </dependency>
      <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>${spring.version}</version>
      </dependency>
      <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>${spring.version}</version>
      </dependency>
      <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-expression</artifactId>
        <version>${spring.version}</version>
      </dependency>
      <dependency>
        <groupId>org.springframework.security</groupId>
        <artifactId>spring-security-web</artifactId>
        <version>3.2.0.RELEASE</version>
      </dependency>
      <dependency>
        <groupId>org.springframework.security</groupId>
        <artifactId>spring-security-config</artifactId>
        <version>3.2.0.RELEASE</version>
      </dependency>
      <dependency>
        <groupId>commons-collections</groupId>
        <artifactId>commons-collections</artifactId>
        <version>3.2</version>
      </dependency>
    </dependencies>
  </dependencyManagement>

  <dependencies>
    <!-- shared look/functionality -->
    <dependency>
      <groupId>us.ak.state.revenue.cssd</groupId>
      <artifactId>myAlaska</artifactId>
      <version>1.6.2</version>
      <exclusions>
        <exclusion>
          <groupId>org.apache.wicket</groupId>
          <artifactId>wicket-datetime</artifactId>
        </exclusion>
        <exclusion>
          <groupId>commons-collections</groupId>
          <artifactId>commons-collections</artifactId>
        </exclusion>
      </exclusions>
    </dependency>
    <dependency>
      <groupId>us.ak.state.revenue.cssd</groupId>
      <artifactId>doc</artifactId>
      <version>1.6.2</version>
    </dependency>

    <!-- WICKET DEPENDENCIES -->
    <dependency>
      <groupId>org.apache.wicket</groupId>
      <artifactId>wicket-datetime</artifactId>
      <version>${wicket.version}</version>
      <exclusions>
        <exclusion>
          <groupId>org.apache.wicket</groupId>
          <artifactId>wicket-core</artifactId>
        </exclusion>
      </exclusions>
    </dependency>

    <!-- JUNIT DEPENDENCY FOR TESTING -->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>servlet-api</artifactId>
      <version>2.4</version>
      <scope>provided</scope>
    </dependency>

    <!-- SPRING Testing -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>${spring.version}</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>${spring.version}</version>
      <!-- TODO: once unit tests work test if this should be test scoped -->
    </dependency>

    <!-- Make Sure CXF starts properly -->
    <dependency>
      <groupId>org.springframework.security</groupId>
      <artifactId>spring-security-config</artifactId>
      <version>3.2.0.RELEASE</version>
      <scope>compile</scope>
    </dependency>

    <dependency>
      <groupId>org.springframework.security</groupId>
      <artifactId>spring-security-web</artifactId>
      <version>3.2.0.RELEASE</version>
    </dependency>

    <!-- Spring Transactional Support -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-orm</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjweaver</artifactId>
      <version>1.7.2</version>
    </dependency>

    <!-- LDAP Authentication -->
    <dependency>
      <groupId>com.novell.ldap</groupId>
      <artifactId>jldap</artifactId>
      <version>4.3</version>
    </dependency>

    <!-- PDF report Generation -->
    <dependency>
      <groupId>com.lowagie</groupId>
      <artifactId>itext</artifactId>
      <version>2.0.4</version>
    </dependency>

    <!-- email -->
    <dependency>
      <groupId>javax.mail</groupId>
      <artifactId>mail</artifactId>
      <version>1.5.0-b01</version>
    </dependency>
    <dependency>
      <groupId>com.sun</groupId>
      <artifactId>jsse</artifactId>
      <version>1.6.0_21</version>
      <scope>system</scope>
      <systemPath>${env.JRE_6_HOME}\lib\jsse.jar</systemPath>
    </dependency>

    <!-- Mainframe/Broker -->
    <dependency>
      <groupId>com.softwareAG.entirex</groupId>
      <artifactId>entirex-runtime</artifactId>
      <version>9.5.1</version>
    </dependency>

      <!-- Unknown / Miscl -->
    <dependency>
      <groupId>commons-collections</groupId>
      <artifactId>commons-collections</artifactId>
      <version>3.2</version>
      </dependency>
    <dependency>
      <groupId>commons-dbcp</groupId>
      <artifactId>commons-dbcp</artifactId>
      <version>1.2.2</version>
    </dependency>

    </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>2.0.2</version>
        <configuration>
          <source>1.6</source>
          <target>1.6</target>
          <encoding>${project.build.sourceEncoding}</encoding>
         <compilerArguments>
           <bootclasspath>
             ${bootClassPath};
           </bootclasspath>
           <endorseddirs>
             ${m2Repository}/javax/xml/bind/jaxb-api/2.2.6/;${m2Repository}/org/apache/cxf/cxf-rt-frontend-jaxws/2.7.5/;${toolsDir};${jsseDir};
           </endorseddirs>
         </compilerArguments>
          <compilerArgument> -Xlint:unchecked </compilerArgument>
          <showDeprecation>true</showDeprecation>
          <showWarnings>true</showWarnings>
         <optimize>true</optimize>
         <debug>true</debug>
        </configuration>
      </plugin>
      <plugin>
       <groupId>com.atlassian.maven.plugins</groupId>
       <artifactId>maven-clover2-plugin</artifactId>
       <version>3.2.2</version>
       <configuration>
         <!-- License info removed -->
         <excludes>
           <exclude>**/SessionFactoryBean*.java</exclude>
         </excludes>
         <cloverDatabase>${project.basedir}/.clover/db</cloverDatabase>
       </configuration>
       <executions>
         <execution>
           <id>clover</id>
           <phase>generate-sources</phase>
           <goals>
             <goal>instrument</goal>
           </goals>
         </execution>
       </executions>
     </plugin>
      <plugin>
        <!-- moves the test results outside of clover-->
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-surefire-plugin</artifactId>
        <version>2.10</version>
        <configuration>
         <reportsDirectory>
           ${project.build.directory}/surefire-reports
         </reportsDirectory>
       </configuration>
      </plugin>
    </plugins>
  </build>    

</project>

MyAlaska是另一个项目成功使用的共享库， 具有以下依赖项：

<!-- another shared jar sits here that pulls in Wicket,Look-feel stuff -->


<!-- ADFS attempt #2, this time with WS-Federation/SAML support -->
<dependency>
  <groupId>org.apache.cxf</groupId>
  <artifactId>cxf-rt-frontend-jaxws</artifactId>
  <version>2.7.5</version>
</dependency>
<dependency>
  <groupId>org.apache.cxf</groupId>
  <artifactId>cxf-rt-transports-http-hc</artifactId>
  <version>2.7.5</version>
</dependency>
<dependency>
  <groupId>javax.xml.bind</groupId>
  <artifactId>jaxb-api</artifactId>
  <version>2.2.6</version>
</dependency>
<!--https WS stuff-->
<dependency>
  <groupId>org.apache.cxf</groupId>
  <artifactId>cxf-rt-rs-security-sso-saml</artifactId>
  <version>2.7.5</version>
</dependency>
<!-- specifically adds SAML/federation to the stack -->
<dependency>
  <groupId>org.apache.cxf.fediz</groupId>
  <artifactId>fediz-core</artifactId>
  <version>1.1.0</version>
</dependency>
<dependency>
  <groupId>org.apache.cxf.fediz</groupId>
  <artifactId>fediz-cxf</artifactId>
  <version>1.1.0</version>
</dependency>
<dependency>
  <groupId>org.apache.cxf.fediz</groupId>
  <artifactId>fediz-spring</artifactId>
  <version>1.1.0</version>
</dependency>

<!-- Spring Security integration-->
<dependency>
  <groupId>org.springframework.security</groupId>
  <artifactId>spring-security-web</artifactId>
  <version>3.1.3.RELEASE</version>
</dependency>

<dependency>
  <groupId>org.apache.wicket</groupId>
  <artifactId>wicket-spring</artifactId>
</dependency>

<!-- configuration update "magic" -->
<dependency>
  <groupId>commons-configuration</groupId>
  <artifactId>commons-configuration</artifactId>
  <version>1.9</version>
</dependency>

<dependency>
  <groupId>junit</groupId>
  <artifactId>junit</artifactId>
  <version>4.11</version>
  <scope>test</scope>
</dependency>
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-test</artifactId>
  <version>3.0.7.RELEASE</version>
  <scope>test</scope>
</dependency>

如果你还在这里，感谢阅读。 我究竟做错了什么？ 为什么CXF / Spring不会启动，我该如何解决？

更新： 运行调试器后，违规类似乎是：org.apache.cxf.ws.policy.AssertionBuilderRegistryImpl 它位于cxf-rt-ws-policy-2.7.5中 据我所知，虽然这是该罐子的唯一地方，但它只包含一次。

JHades更新 当我最初运行报告时，Log4J和Log4J-extras重叠，JavaMail-1.5和geronimo-javamail_1.4_spec也是如此。我已经解决了这些用途。

报告结果：

>>>> Jar overlap report: 


Total number of classes with more than one version: 0

Jhades和mvn dependency:tree -Ddetail=true都认为cxf-rt-ws-policy与其他所有cxf jar版本一样是2.7.5。

java spring maven cxf
2个回答
4
投票

所以我发现我的IDE intellij-dea搞砸了我的构建。 我认为，因为我已配置maven，它只是在引擎盖下运行纯maven。 在我的IDE中，我为我的maven依赖项之前配置了一个已安装的Axis2-1.6.0目录。 Axis-2是从我的应用程序的旧版本中遗留下来的，并且包含很多依赖项的副本，包括Neethi，我已经看到其中列出的其他地方是CXF的这个错误的潜在来源。

2
投票

似乎正在加载的类org.apache.cxf.ws.policy.AssertionBuilderRegistryImpl的版本无效。

您可以使用此命令检查WAR以查看是否存在任何重复的类（来自JHades，我制作的工具），请参阅此处了解duplicate classes report：

java -jar jhades-standalone-report.jar path/to/war/webapp.war

报告应该是这样的：

>>>> Jar overlap report:

poi-3.5-FINAL-20090928.jar overlaps with poi-3.7-20101029.jar - total overlapping classes: 990
xercesImpl-2.7.0.jar overlaps with xercesImpl-2.9.1.jar - total overlapping classes: 867
xalan-2.6.0.jar overlaps with xalan-2.7.1.jar - total overlapping classes: 711
bcel-5.2.jar overlaps with xalan-2.7.1.jar - total overlapping classes: 361
xml-apis-2.9.1.jar overlaps with xml-apis.jar - total overlapping classes: 301
jasperreports-applet-3.7.1.jar overlaps with jasperreports-javaflow-3.7.1.jar - total overlapping classes: 254
jasperreports-3.7.1.jar overlaps with jasperreports-applet-3.7.1.jar - total overlapping classes: 254
...

Total number of classes with more than one version: 6169

此外，还可以查询类的所有版本和当前使用的版本的类路径：

System.out.println("All versions of AssertionBuilderRegistryImpl:" + getClass().getClassLoader().getResources("org/apache/cxf/ws/policy/AssertionBuilderRegistryImpl.class"));

System.out.println("Currently used version of AssertionBuilderRegistryImpl:" + getClass().getClassLoader().getResource("org/apache/cxf/ws/policy/AssertionBuilderRegistryImpl.class"));

有几种可能性：存在多个版本，只有一个是正确的。在这种情况下，在maven中排除具有错误版本的罐子。

如果只存在一个版本，那么它是错误的，使用mvn dependency:tree -Ddetail=true查找它包含的原因，并更新pom以加载正确的版本。

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