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不兼容的魔法值错误

[英]Incompatible magic value error

 原文  2011-06-13 08:04:44  1   2    java/ classloader/ magic-numbers

问题描述

I was following an example from the following link:我正在关注以下链接中的示例：

http://www.javaworld.com/javaworld/jw-10-1996/jw-10-indepth.html?page=1 and this is an output I am getting:http://www.javaworld.com/javaworld/jw-10-1996/jw-10-indepth.html?page=1这是一个 Z78E6221F6393D146681amCE398F

This program will use SimpleClassLoader.
        >>>>>> Load class : TestClass
        >>>>>> Not a system class.
        >>>>>> Fetching the implementation of TestClass
file was read successfully
Exception in thread "main" java.lang.ClassFormatError: Incompatible magic value 1768779887 in class file 
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(Unknown Source)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at aha.SimpleClassLoader.loadClass(SimpleClassLoader.java:80)
    at aha.SimpleClassLoader.loadClass(SimpleClassLoader.java:42)
    at aha.Example.main(Example.java:11)

here is an example of my method that reads a file:这是我读取文件的方法的示例：

 private byte getClassImplFromDataBase(String className)[] {
        System.out.println("        >>>>>> Fetching the implementation of "+className);
        byte result[];
        try {
            FileInputStream fi = new FileInputStream("C:/delete/"+className+".impl");
            result = new byte[fi.available()];
            fi.read(result);
            System.out.println("file was read succesfullyl");
            return result;
        } catch (Exception e) {

            /*
             * If we caught an exception, either the class wasnt found or it
             * was unreadable by our process.
             */
            return null;
        }
    }

I placed TestClass.impl file under C:/delete directory.我将 TestClass.impl 文件放在 C:/delete 目录下。 My classes reside under package: aha So the file TestClass.impl is read ok, but something happens during the result = defineClass(classData, 0, classData.length);我的课程位于 package 下：啊哈 所以文件 TestClass.impl 读取正常，但是在 result = defineClass(classData, 0, classData.length); 期间发生了一些事情； I know this method is deprecated but still??我知道这种方法已被弃用，但仍然存在？？

2 个解决方案

解决方案1
 5  2011-06-13 08:15:10

I don't know what file type .impl is but I suspect it not a class file which contains byte code.我不知道.impl是什么文件类型，但我怀疑它不是包含字节码的 class 文件。 The magic number 1768779887 in hex is 696D706F or impo in ASCII.十六进制的幻数1768779887是696D706F或 ASCII 的impo 。 (The first four bytes of import I suspect) （我怀疑import的前四个字节）

So it would appear to me that you are trying to load uncompiled Java code whcih you cannot do (that is what the compiler is for) You are better of using the Compiler API, but I suspect you really need something like OSGi as trying to load classes your self requires you to have a very detailed understanding of how class loading work.所以在我看来，您正在尝试加载未编译的 Java 代码，而您无法做到（这就是编译器的用途）您最好使用编译器 API，但我怀疑您确实需要像 OSGi 这样的东西来尝试加载您自己的课程要求您非常详细地了解 class 加载的工作原理。

解决方案2
 1  2013-04-19 08:38:28

I've had a similar error with a regular struts2 project, solved cleaning the project .我在常规的 struts2 项目中遇到了类似的错误，解决了清理项目的问题。

8266 ERROR [main]: Excepción arrancando filtro struts2
java.lang.ClassFormatError: Incompatible magic value 0 in class file com/lm/action/musician/MusicianList
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1650)
    at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:856)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1305)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1187)
    at com.opensymphony.xwork2.util.ClassLoaderUtil.loadClass(ClassLoaderUtil.java:144)
    at com.opensymphony.xwork2.ObjectFactory.getClassInstance(ObjectFactory.java:108)
    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.verifyAction(XmlConfigurationProvider.java:424)
    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addAction(XmlConfigurationProvider.java:378)
    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addPackage(XmlConfigurationProvider.java:495)
    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadPackages(XmlConfigurationProvider.java:286)
    at org.apache.struts2.config.StrutsXmlConfigurationProvider.loadPackages(StrutsXmlConfigurationProvider.java:112)
    at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:234)
    at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:66)
    at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:390)
    at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:437)
    at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:74)
    at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:51)
    at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:225)
    at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:308)
    at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:79)
    at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3563)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4133)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1012)
    at org.apache.catalina.core.StandardHost.start(StandardHost.java:718)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1012)
    at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442)
    at org.apache.catalina.core.StandardService.start(StandardService.java:450)
    at org.apache.catalina.core.StandardServer.start(StandardServer.java:680)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:536)
    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.apache.catalina.startup.Bootstrap.start(Bootstrap.java:275)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
8266 ERROR [main]: Excepción arrancando filtro struts2
java.lang.ClassFormatError: Incompatible magic value 0 in class file com/lm/action/musician/MusicianList
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1650)
    at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:856)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1305)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1187)
    at com.opensymphony.xwork2.util.ClassLoaderUtil.loadClass(ClassLoaderUtil.java:144)
    at com.opensymphony.xwork2.ObjectFactory.getClassInstance(ObjectFactory.java:108)
    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.verifyAction(XmlConfigurationProvider.java:424)
    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addAction(XmlConfigurationProvider.java:378)
    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addPackage(XmlConfigurationProvider.java:495)
    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadPackages(XmlConfigurationProvider.java:286)
    at org.apache.struts2.config.StrutsXmlConfigurationProvider.loadPackages(StrutsXmlConfigurationProvider.java:112)
    at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:234)
    at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:66)
    at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:390)
    at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:437)
    at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:74)
    at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:51)
    at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:225)
    at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:308)
    at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:79)
    at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3563)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4133)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1012)
    at org.apache.catalina.core.StandardHost.start(StandardHost.java:718)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1012)
    at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442)
    at org.apache.catalina.core.StandardService.start(StandardService.java:450)
    at org.apache.catalina.core.StandardServer.start(StandardServer.java:680)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:536)
    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.apache.catalina.startup.Bootstrap.start(Bootstrap.java:275)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
abr 19, 2013 10:32:25 AM org.apache.catalina.core.StandardContext start
SEVERE: Error filterStart
abr 19, 2013 10:32:25 AM org.apache.catalina.core.StandardContext start

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