在64位计算机上运行时出现NoClassDefFoundError

问题描述：

在64位计算机上启动服务时，出现以下异常. 但是代码可以在32位计算机上正常运行.

I am getting the following exception while service startup on a 64bit Machine. But the code runs fine on a 32bit machine.

java.lang.NoClassDefFoundError: org/objectweb/asm/commons/EmptyVisitor
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
    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$1.run(URLClassLoader.java:197)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    at org.springframework.context.support.GenericApplicationContext.<init (GenericApplicationContext.java:103)
    at org.springframework.context.support.GenericApplicationContext.<init>(GenericApplicationContext.java:125)
    at org.springframework.coral.CoralApplicationContext.<init>(CoralApplicationContext.java:41)
    at org.springframework.coral.CoralApplicationContext.<init>(CoralApplicationContext.java:35)
    at org.springframework.coral.DisposableApplicationContext.<init>(DisposableApplicationContext.java:16)
    at com.amazon.coral.spring.Launcher.<init>(Launcher.java:85)
    at com.amazon.coral.spring.Launcher.main(Launcher.java:56)
Caused by: java.lang.ClassNotFoundException: org.objectweb.asm.commons.EmptyVisitor
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    ... 19 more

答

除非您(或您使用的库)使用本机代码，否则底层平台很少是Java程序中的问题.

Unless you (or the libraries you use) are using native code, the underlying platform is very seldom the problem in Java programs.

来自NoClassDefFoundError的Javadoc(http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/NoClassDefFoundError.html):

From the Javadoc of NoClassDefFoundError (http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/NoClassDefFoundError.html):

如果Java虚拟机或ClassLoader实例尝试执行以下操作，则抛出该异常加载类的定义(作为常规方法调用的一部分或作为使用新表达式创建新实例的一部分)，并且否可以找到该类的定义.

Thrown if the Java Virtual Machine or a ClassLoader instance tries to load in the definition of a class (as part of a normal method call or as part of creating a new instance using the new expression) and no definition of the class could be found.

搜索到的类定义在当前执行时存在类已编译，但无法再找到该定义.

The searched-for class definition existed when the currently executing class was compiled, but the definition can no longer be found.

因此，在编译代码时就存在它，但是当您尝试在其他地方运行它时就不存在了.造成这种情况的最简单的最典型的原因是，错误地设置了类路径，通常是因为没有将包含所讨论类的jar文件放在类路径中.修改您的类路径定义并重新运行.

So it was present when the code was compiled, but not anymore when you try to run it elsewhere. The single-most typical reason for this is that the classpath is incorrectly set up, usually by not having the jar-file containing the class in question is not in the classpath. Revise your classpath definition and rerun.

如果您不熟悉类路径的工作原理，强烈建议您阅读Oracle Java教程.

If you are unfamiliar with how the classpath works I can strongly recommend reading up on the Oracle Java Tutorial.

在64位计算机上运行时出现NoClassDefFoundError

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