将 jar 标记为提供时出现 java.lang.NoClassDefFoundError [英] java.lang.NoClassDefFoundError when marking a jar as provided
问题描述
我的 webapp 中有以下依赖项:
I have the follwing dependency in my webapp:
<!-- swagger -->
<dependency>
<groupId>com.mangofactory</groupId>
<artifactId>swagger-springmvc</artifactId>
<version>${version.swagger.springmvc}</version>
</dependency>
我想减小 war 文件的大小，所以我将 swagger jar 标记为提供:
I want to reduce the size of the war file so I marked the swagger jar as provided:
<!-- swagger -->
<dependency>
<groupId>com.mangofactory</groupId>
<artifactId>swagger-springmvc</artifactId>
<version>${version.swagger.springmvc}</version>
<scope>provided</scope>
</dependency>
我将 swagger jar 添加到 tomcat 的公共库文件夹中，因此它应该在运行时由 tomcat 提供，但是当我尝试部署应用程序时，我遇到了这个异常:
I added the swagger jar to tomcat's common lib folder so it should be provided by tomcat during runtime, but when i try to deply the app I got this exception:
java.lang.IllegalStateException: Cannot load configuration class: com.mangofactory.swagger.configuration.DocumentationConfig
at org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses(ConfigurationClassPostProcessor.java:368)
at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanFactory(ConfigurationClassPostProcessor.java:244)
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:694)
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:633)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:461)
at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:651)
at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:599)
at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:665)
at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:518)
at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:459)
at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)
at javax.servlet.GenericServlet.init(GenericServlet.java:158)
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1279)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1192)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1087)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5210)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5493)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.NoClassDefFoundError: com/fasterxml/classmate/TypeResolver
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2688)
at java.lang.Class.getDeclaredMethods(Class.java:1962)
at org.springframework.cglib.core.ReflectUtils.addAllMethods(ReflectUtils.java:348)
at org.springframework.cglib.proxy.Enhancer.getMethods(Enhancer.java:421)
at org.springframework.cglib.proxy.Enhancer.generateClass(Enhancer.java:456)
at org.springframework.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)
at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:216)
at org.springframework.cglib.proxy.Enhancer.createHelper(Enhancer.java:377)
at org.springframework.cglib.proxy.Enhancer.createClass(Enhancer.java:317)
at org.springframework.context.annotation.ConfigurationClassEnhancer.createClass(ConfigurationClassEnhancer.java:118)
at org.springframework.context.annotation.ConfigurationClassEnhancer.enhance(ConfigurationClassEnhancer.java:92)
at org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses(ConfigurationClassPostProcessor.java:358)
... 23 more
Caused by: java.lang.ClassNotFoundException: com.fasterxml.classmate.TypeResolver
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1718)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1569)
... 36 more
我注意到问题来自 org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses 但我在 pom 中声明了所有需要的 spring jar 没有提供的范围在没有提供的范围的情况下运行 web 应用程序它可以正常工作吗?
I notice that the problem is comming from the org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses but i have all the spring jar required declared in my pom without the provided scope also when running the webapp without the provided scope it work fine any idea?
推荐答案
我认为问题来自另一个丢失的 jar.在堆栈跟踪中我们看到
I think the issue comes from another missing jar. In the stacktrace we see
Caused by: java.lang.ClassNotFoundException: com.fasterxml.classmate.TypeResolver
com.fasterxml.classmate.TypeResolver 存在于 jar classmate.jar 中，它是 swagger-springmvc 的依赖项.
The com.fasterxml.classmate.TypeResolver is present in the jar classmate.jar, which is a dependency from swagger-springmvc.
当您使用范围编译时，也会部署 swagger-springmvc 的依赖项.提供范围后，您必须提供 swagger-springmvc jar，以及它的所有依赖项.这里需要提供classmate.jar.
When you use scope compile, the dependencies of swagger-springmvc are deployed as well. With scope provided, you have to provide the swagger-springmvc jar, but also all its dependencies. Here, you need to provided classmate.jar.
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