Websphere 和 Spring 的 ClassNotFoundException / NoClassDefFoundException

Question

我有一个 EAR/WAR 文件，该文件将部署在 Websphere Application Server 上。 Web 应用程序使用 spring-web/webmvc。将完整的 spring jar 堆栈添加到 Websphere 应用程序服务器类路径（通过治理）。因此，我只在此 Web 应用程序 WAR 文件的 WEB-INF/lib 中提供 1 个 jar (castor-1.2.jar) 文件，因为仅此应用程序需要此文件。类加载策略设置为 PARENT_LAST。

spring 配置引用了一个作为 WAR 文件的一部分提供的类。

在应用程序启动期间，我得到 ClassNotFoundException 和 NoClassDefFoundError ，该类包含在 WEB-INF/lib 内的 castor-1.2.jar 中。

谁能解释一下，为什么只要将 Spring jar 部署到服务器类路径并且将 castor 作为应用程序的一部分交付，类加载器就不会找到 castor 类？

1 - Module - com.ibm.ws.classloader.CompoundClassLoader
      file: ... test-ear.ear/test-war.war/WEB-INF/lib/castor-1.2.jar
2 - Module - com.ibm.ws.classloader.CompoundClassLoader
3 - Server-associated - com.ibm.ws.classloader.ExtJarClassLoader
      file: ... clusters/cluster1/custom/classpath/base-lib/spring-webmvc-3.2.9.RELEASE.jar
      ... other spring libraries
4 - ...

我能做些什么（除了多余地运送与 WAR 捆绑在一起的 spring 库——顺便说一句！）来解决这个问题？

这是个例外：

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.view.xml.MarshallingView#16799e2d' defined in ServletContext resource [/WEB-INF/castortest-servlet.xml]: Initialization of bean failed; nested exception is java.lang.NoClassDefFoundError: org.exolab.castor.mapping.MappingException
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:529)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
        at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveInnerBean(BeanDefinitionValueResolver.java:276)
        ... 81 more
Caused by: java.lang.NoClassDefFoundError: org.exolab.castor.mapping.MappingException
        at java.lang.J9VMInternals.verifyImpl(Native Method)
        at java.lang.J9VMInternals.verify(J9VMInternals.java:93)
        at java.lang.J9VMInternals.prepare(J9VMInternals.java:490)
        at java.lang.Class.getDeclaredConstructors(Class.java:533)
        at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.determineCandidateConstructors(AutowiredAnnotationBeanPostProcessor.java:231)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineConstructorsFromBeanPostProcessors(AbstractAutowireCapableBeanFactory.java:1002)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:975)
        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.BeanDefinitionValueResolver.resolveInnerBean(BeanDefinitionValueResolver.java:276)
        at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:122)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1417)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1158)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
        ... 83 more
Caused by: java.lang.ClassNotFoundException: org.exolab.castor.mapping.MappingException
        at java.net.URLClassLoader.findClass(URLClassLoader.java:434)
        at com.ibm.ws.bootstrap.ExtClassLoader.findClass(ExtClassLoader.java:204)
        at java.lang.ClassLoader.loadClassHelper(ClassLoader.java:688)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:667)
        at com.ibm.ws.bootstrap.ExtClassLoader.loadClass(ExtClassLoader.java:119)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:650)
        at com.ibm.ws.classloader.ProtectionClassLoader.loadClass(ProtectionClassLoader.java:62)
        at com.ibm.ws.classloader.ProtectionClassLoader.loadClass(ProtectionClassLoader.java:58)
        at com.ibm.ws.classloader.CompoundClassLoader.loadClass(CompoundClassLoader.java:598)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:650)
        ... 97 more

Answer 1

您需要以下内容：

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-oxm</artifactId>
        <version>3.0.5.RELEASE</version>
    </dependency>

    <!-- Uses Castor for XML -->
    <dependency>
        <groupId>org.codehaus.castor</groupId>
        <artifactId>castor</artifactId>
        <version>1.2</version>
    </dependency>

    <!-- Castor need this -->
    <dependency>
        <groupId>xerces</groupId>
        <artifactId>xercesImpl</artifactId>
        <version>2.8.1</version>
    </dependency>

</dependencies>