Review - II Kevin Gilmore Changes
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@ -1,48 +1,19 @@
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package com.baeldung.loadedclasslisting;
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import java.lang.reflect.Method;
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import java.util.Arrays;
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import com.baeldung.loadedclasslisting.ListLoadedClassesAgent.ClassLoaderType;
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import com.baeldung.loadedclasslisting.customLoader.ClassLoaderInfo;
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import com.baeldung.loadedclasslisting.customLoader.CustomClassLoader;
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public class Launcher {
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private static ClassLoader customClassLoader;
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public static void main(String[] args) {
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printClassesLoadedBy(ClassLoaderType.BOOTSTRAP);
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printClassesLoadedBy(ClassLoaderType.SYSTEM);
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printClassesLoadedBy(ClassLoaderType.EXTENSION);
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printClassesLoadedBy(ClassLoaderType.CUSTOM);
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printClassesLoadedBy("BOOTSTRAP");
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printClassesLoadedBy("SYSTEM");
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printClassesLoadedBy("EXTENSION");
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}
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private static void printClassesLoadedBy(ClassLoaderType classLoaderType) {
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Class<?>[] classes;
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if (classLoaderType.equals(ClassLoaderType.CUSTOM)) {
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customClassLoader = customClassLoading();
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classes = ListLoadedClassesAgent.listLoadedClasses(customClassLoader);
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} else {
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classes = ListLoadedClassesAgent.listLoadedClasses(classLoaderType);
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}
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private static void printClassesLoadedBy(String classLoaderType) {
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Class<?>[] classes = ListLoadedClassesAgent.listLoadedClasses(classLoaderType);
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Arrays.asList(classes)
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.forEach(clazz -> System.out.println(
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classLoaderType + " ClassLoader : " + clazz.getCanonicalName()));
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}
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private static CustomClassLoader customClassLoading() {
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CustomClassLoader customClassLoader = new CustomClassLoader();
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Class<?> c;
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try {
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c = customClassLoader.findClass(ClassLoaderInfo.class.getName());
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Object ob = c.getDeclaredConstructor()
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.newInstance();
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Method md = c.getMethod("printClassLoaders");
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md.invoke(ob);
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} catch (Exception e) {
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e.printStackTrace();
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}
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return customClassLoader;
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}
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}
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@ -4,17 +4,13 @@ import java.lang.instrument.Instrumentation;
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public class ListLoadedClassesAgent {
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public enum ClassLoaderType {
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SYSTEM, EXTENSION, BOOTSTRAP, CUSTOM , PLATFORM
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}
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private static Instrumentation instrumentation;
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public static void premain(String agentArgs, Instrumentation instrumentation) {
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ListLoadedClassesAgent.instrumentation = instrumentation;
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}
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public static Class<?>[] listLoadedClasses(ClassLoaderType classLoaderType) {
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public static Class<?>[] listLoadedClasses(String classLoaderType) {
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if (instrumentation == null) {
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throw new IllegalStateException(
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"ListLoadedClassesAgent is not initialized.");
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@ -23,24 +19,18 @@ public class ListLoadedClassesAgent {
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getClassLoader(classLoaderType));
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}
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public static Class<?>[] listLoadedClasses(ClassLoader classLoader) {
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if (instrumentation == null) {
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throw new IllegalStateException(
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"ListLoadedClassesAgent is not initialized.");
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}
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return instrumentation.getInitiatedClasses(classLoader);
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}
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private static ClassLoader getClassLoader(ClassLoaderType classLoaderType) {
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private static ClassLoader getClassLoader(String classLoaderType) {
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ClassLoader classLoader = null;
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switch (classLoaderType) {
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case SYSTEM:
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case "SYSTEM":
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classLoader = ClassLoader.getSystemClassLoader();
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break;
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case EXTENSION:
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case "EXTENSION":
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classLoader = ClassLoader.getSystemClassLoader().getParent();
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break;
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case BOOTSTRAP:
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// passing a null value to the Instrumentation : getInitiatedClasses method
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// defaults to the bootstrap class loader
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case "BOOTSTRAP":
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break;
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default:
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break;
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