[英]Incompatible magic value error
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)
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;
}
}
我将 TestClass.impl 文件放在 C:/delete 目录下。 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; 我知道这种方法已被弃用,但仍然存在??
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。 十六进制的幻数1768779887
是696D706F
或 ASCII 的impo
。 (我怀疑import
的前四个字节)
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。
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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