使用CGlib出现java.lang.NoClassDefFoundError: org/objectweb/asm/Type异常补充

Posted 2021-03-03 alicia-memory

援引：使用CGlib出现java.lang.NoClassDefFoundError: org/objectweb/asm/Type异常

援引：class net.sf.cglib.core.DebuggingClassWriter has interface org.objectweb.asm.ClassVisitor as super class

 源环境：

IDE：IntelliJ IDEA

项目目的：测试动态代理 -- CGLIB

项目属性：Java Application

项目结构：

• 被代理类
• 测试类
• /lib

依赖：第三方jar包

• cglib-3.2.5.jar ( 链接：https://pan.baidu.com/s/1wmnXSVV_UwIFsEqU8805hQ )

异常信息：

Exception in thread "main" java.lang.NoClassDefFoundError: org/objectweb/asm/Type
	at net.sf.cglib.core.TypeUtils.parseType(TypeUtils.java:184)
	at net.sf.cglib.core.KeyFactory.<clinit>(KeyFactory.java:72)
	at net.sf.cglib.proxy.Enhancer.<clinit>(Enhancer.java:72)
	at com.spring_02_aop.$_02_proxy.cglib.Client.main(Client.java:28)
Caused by: java.lang.ClassNotFoundException: org.objectweb.asm.Type
	at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 4 more

异常解决：

援引中的博主原文："报错显示有找不到的类，上网查了以下知道了很多java字节码操作和分析的第三方类库都引用了asm.jar文件，由于工程不是Maven管理的，无法解决以来传递问题，所以要手动引入asm.jar文件。把asm.jar文件添加到项目路径类，运行，然后就正常了。"

ASM原文(来自github.com/cglib/cglib/wiki)："cglib-#.#_#.jar - binary distribution, CGLIB classes only, it must be used to extend cglib classes dependant on ASM API"

ASM白话翻译："cglib-#.#_#.jar - 必须依赖于ASM API来扩展cglib"

补充：

• 网上找到 asm.jar，添加到项目，异常如下：

Exception in thread "main" java.lang.ExceptionInInitializerError
	at com.spring_02_aop.$_02_proxy.cglib.Client.main(Client.java:28)
Caused by: java.lang.IllegalStateException: Unable to load cache item
	at net.sf.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:79)
	at net.sf.cglib.core.internal.LoadingCache.get(LoadingCache.java:34)
	at net.sf.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:116)
	at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:291)
	at net.sf.cglib.core.KeyFactory$Generator.create(KeyFactory.java:221)
	at net.sf.cglib.core.KeyFactory.create(KeyFactory.java:174)
	at net.sf.cglib.core.KeyFactory.create(KeyFactory.java:153)
	at net.sf.cglib.proxy.Enhancer.<clinit>(Enhancer.java:73)
	... 1 more
Caused by: java.lang.IncompatibleClassChangeError: class net.sf.cglib.core.DebuggingClassWriter has interface org.objectweb.asm.ClassVisitor as super class
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:468)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	at net.sf.cglib.core.DefaultGeneratorStrategy.getClassVisitor(DefaultGeneratorStrategy.java:30)
	at net.sf.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:24)
	at net.sf.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:329)
	at net.sf.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:93)
	at net.sf.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:91)
	at net.sf.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at net.sf.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61)
	... 8 more

• 　　这就是另一个故事了（cglib库版本 和 asm版本 匹配问题）：

博主原文："(试错)..(试错)..(试错)..(试错)......我们下载最新的ASM文件，则解决了以上问题。"

刚好我手头上存有一份 asm-5.0.4版本，导入项目，Run...Bingo！

asm-5.0.4.jar（链接：https://pan.baidu.com/s/1cZJLWQwDk8cEM69RWg521w）