初始化在jar中擴展類的bean時，上下文初始化失敗

Question

我正在嘗試使用applicationContext.xml初始化一個bean，但是它初始化失敗，可能是因為正在初始化的類正在擴展一個位於jar內的抽象類。

因此，在主項目的applicationContext中，我具有以下內容：

<bean id="TestMessageListener" class="za.co.mycee.core.util.Test" />

我的Test.java如下：

package za.co.mycee.core.util;

import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.amqp.core.Message;
import org.springframework.beans.factory.annotation.Autowired;

import za.co.mycee.messaging.model.TestRequest;
import za.co.mycee.messaging.model.TestResponse;
import za.co.mycee.messaging.service.TestService;

import com.rabbitmq.client.Channel;

public class Test extends TestService {

    @Autowired
    private AmqpTemplate template;

    @Override
    protected String getQueue() {
        return "test";
    }

    @Override
    protected String getExchange() {
        return "";
    }

    @Override
    protected Class<TestRequest> getRequestType() {
        return TestRequest.class;
    }

    @Override
    protected Class<TestResponse> getResponseType() {
        return TestResponse.class;
    }

    @Override
    protected AmqpTemplate getTemplate() {
        return this.template;
    }

    @Override
    public void onMessage(Message message, Channel channel) throws Exception {

        System.out.println(" >> " + new String(message.getBody()));

    }

}

以及在執行mvn tomcat后遇到的完整異常：運行

2013-12-13 15:45:46,031 [main] ERROR org.springframework.web.context.ContextLoader - Context initialization failed
org.springframework.beans.factory.CannotLoadBeanClassException: Error loading class [za.co.mycee.core.util.Test] for bean with name 'TestMessageListener' defined in file [C:\Code\SpringSource\sts-4.3.1.RELEASE\sts-3.4.0.RELEASE\mycee\mycee-core\target\classes\META-INF\spring\applicationContext.xml]: problem with class file or dependent class; nested exception is java.lang.NoClassDefFoundError: za/co/mycee/messaging/service/TestService
        at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1266)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:581)
        at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1332)
        at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:898)
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:588)
        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
        at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:383)
        at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:283)
        at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:112)
        at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4135)
        at org.apache.catalina.core.StandardContext.start(StandardContext.java:4630)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
        at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
        at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:445)
        at org.apache.catalina.startup.Embedded.start(Embedded.java:825)
        at org.codehaus.mojo.tomcat.AbstractRunMojo.startContainer(AbstractRunMojo.java:558)
        at org.codehaus.mojo.tomcat.AbstractRunMojo.execute(AbstractRunMojo.java:255)
        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:320)
        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:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:601)
        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: java.lang.NoClassDefFoundError: za/co/mycee/messaging/service/TestService
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
        at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1141)
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1612)
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1491)
        at org.springframework.util.ClassUtils.forName(ClassUtils.java:258)
        at org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:415)
        at org.springframework.beans.factory.support.AbstractBeanFactory.doResolveBeanClass(AbstractBeanFactory.java:1284)
        at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1255)
        ... 39 more
Caused by: java.lang.ClassNotFoundException: za.co.mycee.messaging.service.TestService
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1645)
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1491)
        ... 55 more
Dec 13, 2013 3:45:46 PM org.apache.catalina.core.StandardContext listenerStart
SEVERE: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.CannotLoadBeanClassException: Error loading class [za.co.mycee.core.util.Test] for bean with name 'TestMessageListener' defined in file [C:\Code\SpringSource\sts-4.3.1.RELEASE\sts-3.4.0.RELEASE\mycee\mycee-core\target\classes\META-INF\spring\applicationContext.xml]: problem with class file or dependent class; nested exception is java.lang.NoClassDefFoundError: za/co/mycee/messaging/service/TestService
        at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1266)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:581)
        at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1332)
        at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:898)
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:588)
        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
        at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:383)
        at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:283)
        at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:112)
        at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4135)
        at org.apache.catalina.core.StandardContext.start(StandardContext.java:4630)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
        at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
        at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:445)
        at org.apache.catalina.startup.Embedded.start(Embedded.java:825)
        at org.codehaus.mojo.tomcat.AbstractRunMojo.startContainer(AbstractRunMojo.java:558)
        at org.codehaus.mojo.tomcat.AbstractRunMojo.execute(AbstractRunMojo.java:255)
        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:320)
        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:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:601)
        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: java.lang.NoClassDefFoundError: za/co/mycee/messaging/service/TestService
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
        at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1141)
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1612)
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1491)
        at org.springframework.util.ClassUtils.forName(ClassUtils.java:258)
        at org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:415)
        at org.springframework.beans.factory.support.AbstractBeanFactory.doResolveBeanClass(AbstractBeanFactory.java:1284)
        at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1255)
        ... 39 more
Caused by: java.lang.ClassNotFoundException: za.co.mycee.messaging.service.TestService
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1645)
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1491)
        ... 55 more

Dec 13, 2013 3:45:46 PM org.apache.catalina.core.StandardContext start
SEVERE: Error listenerStart
Dec 13, 2013 3:45:46 PM org.apache.catalina.core.StandardContext start
SEVERE: Context [/mycee-core] startup failed due to previous errors
Dec 13, 2013 3:45:46 PM org.apache.catalina.core.ApplicationContext log
INFO: Closing Spring root WebApplicationContext

顯然，如果刪除擴展TestService並刪除所有@Override，則它將運行，但隨后我可以重新使用TestService內部的代碼。 如何使它知道Jar中的TestService並擺脫錯誤？

更新 ：正如Frederic正確指出的那樣，mycee-messaging.jar不在我的類路徑中，當我構建一個war文件並查看WEB-INF / lib時，沒有mycee-messaging.jar。

所以在我的pom.xml中，我有：

<dependency>
    <groupId>za.co.mycee</groupId>
    <artifactId>mycee-messaging</artifactId>
    <version>${mycee.messaging}</version>
    <scope>provided</scope>
</dependency>    

當我執行mvn eclipse：eclipse並刷新mycee-core時，項目mycee-messaging會在項目下列出，而eclipse似乎可以用，但它不會在庫下列出。

檢查.m2 / repository / za / co / mycee / mycee-messaging / 1.0.1，我可以看到mycee-messaging-1.0.1.jar和mycee-messaging-1.0.1.pom，所以mvn clean install可以它的工作正確。

我是否需要在pom.xml中添加其他內容，以使Maven將該jar包含在war文件中？

解決方案 ：刪除范圍標簽

一些不錯的閱讀材料，以了解提供的范圍為何正在執行其工作： http : //docs.codehaus.org/display/MAVENUSER/Dependency+Scopes

Answer 1

 <scope>provided</scope>

意味着您希望在這種情況下，您的tomcat容器將為您提供依賴關系，因此maven在戰爭中不會為您捆綁它。

來自Maven文檔的更多信息：

提供的作用域很像編譯，但是表明您希望JDK或容器在運行時提供依賴項。 例如，在為Java Enterprise Edition構建Web應用程序時，您將對Servlet API和相關Java EE API的依賴關系設置為提供的范圍，因為Web容器提供了這些類。 該作用域僅在編譯和測試類路徑上可用，並且不可傳遞。