isDirectory()) result = new URL(result, clsAsResource); } catch (MalformedURLException ignore) {} } } } if (result == null) { // Try to find 'cls' definition as a resource; this is not // document.d to be legal, but Sun's implementations seem to //allow this: final Class...
checkPackageDefinition(name.substring(0,i)); } catch (Exception se) { if (log.isTraceEnabled()) { log.trace(" -->Exception-->ClassNotFoundException", se); } throw new ClassNotFoundException(name, se); } } } // Ask our superclass to locate this class, if possible // (throws ...
import java.lang.instrument.ClassDefinition; import java.lang.instrument.Instrumentation; public class MyAgent { //agentArgs就是VirtualMachine.loadAgent()的第二个参数 public static void agentmain(String agentArgs, Instrumentation inst) { try { System.out.println("args: " + agentArgs); System.out....
publicvoidredefineClasses(ClassDefinition[]definitions)throws ClassNotFoundException{if(!isRedefineClassesSupported()){thrownewUnsupportedOperationException("redefineClasses is not supported in this environment");}if(definitions==null){thrownewNullPointerException("null passed as 'definitions' in redefineClasses")...
首先创建一个java工程 jvm-classloader jdk版本采用1.8.0_144 包名为src/com.test 创建类 MainClass01,结构如下图: 首先我们通过代码的形式来看看,我们的启动类加载器到底加载了哪些包 packagecom.test;importjava.util.Arrays;importjava.util.List;/** ...
Exception in thread "main" java.lang.LinkageError: loader (instance of loader/MyClassLoader): attempted duplicate class definition for name: "loader/Person" at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:763) at java.lang.ClassLoader.de...
注意在添加这个方法之前,有一个判断,判断当前beanDefinition的是不是定义的单例,是否允许循环依赖以及当前beanName是不是在正在创建中集合(isSingletonCurrentlyInCreation(beanName)) 只有三者成立的情况下才会添加。 protected void addSingletonFactory(String beanName, ObjectFactory<?> singletonFactory) { ...
Java虚拟机与程序的生命周期 在如下几种情况下,Java虚拟机将结束生命周期 执行了System.exit()方法 程序正常执行结束 程序在执行过程中遇到了异常或者错误而异常终止 由于操作系统出现错误而导致Java虚拟机进行终止 类的加载、连接与初始化# 加载: 查找并加载类的二进制数据 ...
and that garbage collection is the mechanism that does that disposal. The JVM is also responsible for allocating and maintaining thethat the developer takes for granted. As an example, the JVM’s execution engine is responsible for taking something like thenewkeyword in Java, and turning it i...
Chapter 9-Definition of Bytecode Instructions The previous article introduced the Java stack frame creation and bytecode dispatch logic under the interpretation and execution, but it has never been mentioned how the virtual machine executes the bytecode in the Java method. Before introducing the execu...