“NoClassDefFoundError:无法初始化类"；错误 [英] "NoClassDefFoundError: Could not initialize class" error

问题描述

当我运行我的项目时，我得到了很多这个错误的输出:

<前>2009 年 9 月 9 日上午 8:22:23 org.apache.catalina.core.StandardWrapperValve 调用严重:servlet Jersey 的 Servlet.service() 抛出异常java.lang.NoClassDefFoundError:无法初始化类 SpringFactory在 com.point2.prospect.persistence.hibernate.HibernateTransactionInterceptor.doFilter(HibernateTransactionInterceptor.java:17)在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)在 com.point2.prospect.restapi.ServerErrorInterceptor.doFilter(ServerErrorInterceptor.java:27)在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)在 org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)在 org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)在 org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)在 org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)在 org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)在 org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)在 org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)在 org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)在 org.apache.tomcat.util.net.JioEndpoint$Worker.run(JioEndpoint.java:447)在 java.lang.Thread.run(Thread.java:619)

我注意到这个问题的模式是在整个网络上被问到，但没有真正的答案.这种错误的一般原因是什么?

解决方案

NoClassDefFound 错误是一个模糊的错误，通常隐藏着更严重的问题.它不与 ClassNotFoundException 相同(当类不存在时抛出).

NoClassDefFound 可能表明该类不存在，正如 javadocs 所示，但通常在类加载器加载类的字节并对其调用defineClass"后抛出.还要仔细检查您的完整堆栈跟踪是否有其他线索或可能的原因"异常(尽管您的特定回溯没有显示).

当您收到 NoClassDefFoundError 时，首先要查看的是类的静态位，即在类定义期间发生的任何初始化.如果失败，它将抛出 NoClassDefFoundError - 它应该抛出 ExceptionInInitializerError 并指出问题的详细信息，但根据我的经验，这些很少见.它只会在第一次尝试定义类时执行 ExceptionInInitializerError，之后它只会抛出 NoClassDefFound.所以看看之前的日志.

因此，我建议查看该 HibernateTransactionInterceptor 行中的代码并查看它需要什么.似乎无法定义类SpringFactory.因此，也许检查该类中的初始化代码，这可能会有所帮助.如果您可以调试它，请将其停在上面 (17) 的最后一行并调试，以便您可以尝试找到导致异常的确切行.还要检查日志中的更高层，如果您很幸运，可能会出现 ExceptionInInitializerError.

When I run my project, I get numerous outputs of this error:

Sep 9, 2009 8:22:23 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet Jersey threw exception
java.lang.NoClassDefFoundError: Could not initialize class SpringFactory
        at com.point2.prospect.persistence.hibernate.HibernateTransactionInterceptor.doFilter(HibernateTrans
actionInterceptor.java:17)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at com.point2.prospect.restapi.ServerErrorInterceptor.doFilter(ServerErrorInterceptor.java:27)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
        at java.lang.Thread.run(Thread.java:619)

I notice that this problem has a pattern of being asked all over the web, but with no real answers. What is a general cause for this kind of error?

解决方案

NoClassDefFound error is a nebulous error and is often hiding a more serious issue. It is not the same as ClassNotFoundException (which is thrown when the class is just plain not there).

NoClassDefFound may indicate the class is not there, as the javadocs indicate, but it is typically thrown when, after the classloader has loaded the bytes for the class and calls "defineClass" on them. Also carefully check your full stack trace for other clues or possible "cause" Exceptions (though your particular backtrace shows none).

The first place to look when you get a NoClassDefFoundError is in the static bits of your class i.e. any initialization that takes place during the defining of the class. If this fails it will throw a NoClassDefFoundError - it's supposed to throw an ExceptionInInitializerError and indicate the details of the problem but in my experience, these are rare. It will only do the ExceptionInInitializerError the first time it tries to define the class, after that it will just throw NoClassDefFound. So look at earlier logs.

I would thus suggest looking at the code in that HibernateTransactionInterceptor line and seeing what it is requiring. It seems that it is unable to define the class SpringFactory. So maybe check the initialization code in that class, that might help. If you can debug it, stop it at the last line above (17) and debug into so you can try find the exact line that is causing the exception. Also check higher up in the log, if you very lucky there might be an ExceptionInInitializerError.

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