urlclassloader

Hi I am creating a plugin which requires loading jars dynamically and accessing the classes and methods of these jars. I tried using URLClassLoader and am able to load the classes as shown below URL myJarFile = new URL("jar","","file:"+jarPath); URLClassLoader sysLoader =(URLClassLoader)ClassLoader.getSystemClassLoader(); Class sysClass = URLClassLoader.class; Method sysMethod = sysClass.getDeclaredMethod("addURL", new Class[]{URL.class}); sysMethod.setAccessible(true); sysMethod.invoke(sysLoader, new Object[]{myJarFile}); But the issue with this is that we have to load classes into

I'm writing a piece of software that is distributed as a JAR file. Currently, this JAR file can be tampered with to retrieve and save another file that our server transmits via URLClassLoader , be decompiled, and find various things in our code that should remain private for the security of the clients using it. Basically, I want to implement a way to check if the original JAR is tampered with. I know this is paradoxically impossible by implementing a check for validity of a SignedObject in the original class due to the nature of Java being able to be decompiled, but is there some other way

ClassLoader，Thread.currentThread().setContextClassLoader，tomcat的ClassLoader 2014-05-07 21:41 Loull 阅读( 6776) 评论( 0) 编辑 收藏 实际上，在Java应用中所有程序都运行在线程里，如果在程序中没有手工设置过ClassLoader，对于一般的java类如下两种方法获得的ClassLoader通常都是同一个 this.getClass.getClassLoader()； Thread.currentThread().getContextClassLoader()； 方法一得到的Classloader是静态的，表明类的载入者是谁； 方法二得到的Classloader是动态的，谁执行（某个线程），就是那个执行者的Classloader。对于单例模式的类，静态类等，载入一次后，这个实例会被很多程序（线程）调用，对于这些类，载入的Classloader和执行线程的Classloader通常都不同。 一、线程上下文类加载器 　　线程上下文类加载器（context class loader）是从 JDK 1.2 开始引入的。类 java.lang.Thread 中的方法 getContextClassLoader() 和 setContextClassLoader(ClassLoader

Java学习笔记18-类加载机制 类生命周期 加载：读取二进制内容 验证：验证class文件格式规范、语义分析、引用验证、字节码验证 准备：分配内存、设置类static修饰的变量初始值 解析：类、接口、字段、类方法等解析 初始化：为静态变量赋值；执行静态代码块 使用：创建实例对象 卸载：从JVM方法区中卸载 类加载器 类加载器负责装入类，搜索网络、jar、zip、文件夹、二进制数据、内存等指定位置的类资源。 一个java程序运行，最少有三个类加载器实例，负责不同类的加载。 Bootstrap loader核心类库加载器：C/C++实现，无对应java类：null；加载JRE_HOME/jre/lib目录，或用户配置的目录；JDK核心类库 rt.jar…String… Extension Class loader：ExtClassLoader的实例：加载JRE_HOME/jre/lib/ext目录，JDK拓展包，或用户配置的目录 application class loader用户应用程序加载器：AppClassLoader的实例：加载java.class.path指定的目录，用户应用程序class-path 或者java命令运行时参数-cp… 验证问题 查看类对应的加载器 通过JDK-API进行查看：java.lang.getClassLoader() 返回装载类的类加载器

I want to load specific jars in ScriptEngineManager using specific ClassLoader This constructor loads the implementations of ScriptEngineFactory visible to the given ClassLoader using the service provider mechanism. The problem when I tried to create Classloader File file = new File("c:\\myclasses\\"); try { // Convert File to a URL URL url = file.toURI().toURL(); // file:/c:/myclasses/ URL[] urls = new URL[]{url}; // Create a new class loader with the directory ClassLoader cl = new URLClassLoader(urls) And I'm getting also class that weren't in class for example Spring Class cls1 = cl

springboot整合dubbo时候，添加了一下依赖，讲道理，这几个jar包应该是够了的，但是就出现了如下异常， java.lang.NoClassDefFoundError: org/apache/curator/framework/recipes/cache/TreeCacheListener at java.lang.ClassLoader.defineClass1(Native Method) ~[na:1.8.0_191] at java.lang.ClassLoader.defineClass(ClassLoader.java:763) ~[na:1.8.0_191] at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[na:1.8.0_191] at java.net.URLClassLoader.defineClass(URLClassLoader.java:468) ~[na:1.8.0_191] at java.net.URLClassLoader.access$100(URLClassLoader.java:74) ~[na:1.8.0_191] at java.net.URLClassLoader$1.run(URLClassLoader.java:369

java.lang.IllegalStateException: Error processing condition on com.alibaba.boot.dubbo.DubboAutoConfiguration.dubboProtocolConfig at org.springframework.boot.autoconfigure.condition.SpringBootCondition.matches(SpringBootCondition.java:64) ~[spring-boot-autoconfigure-2.0.3.RELEASE.jar:2.0.3.RELEASE] at org.springframework.context.annotation.ConditionEvaluator.shouldSkip(ConditionEvaluator.java:108) ~[spring-context-5.0.7.RELEASE.jar:5.0.7.RELEASE] at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsForBeanMethod

C:\Users\lxn\Desktop\billsystem>java -jar billsystem-0.0.1-SNAPSHOT.jar Exception in thread "main" java.lang.UnsupportedClassVersionError: org/springframework/boot/loader/JarLauncher : Unsupported major.minor version 52.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(Unknown Source) at java.security.SecureClassLoader.defineClass(Unknown Source) at java.net.URLClassLoader.defineClass(Unknown Source) at java.net.URLClassLoader.access$100(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at

转载请注明来源： http://blog.csdn.net/loongshawn/article/details/50556760 《Java Web工程转换为基于Maven的Web工程》 《Maven Web工程运行异常:Maven.multiModuleProjectDirectory system propery is not set的问题》 《Maven运行异常:Exception in thread “main” java.lang.UnsupportedClassVersionError》 1 背景 Linux平台部署maven项目，提示如下异常： Exception in thread “main”java.lang.UnsupportedClassVersionError: com/autonavi/App : Unsupported major.minor version 51.0 2 异常 异常摘要 Exception in thread "main" java.lang.UnsupportedClassVersionError: com/autonavi/App : Unsupported major.minor version 51.0 详细异常 $sudo ./appctl.sh start /home/admin/rus-api-services