BAEL-1699 - Java 9 illegal reflective access warning
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#!/bin/bash
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DIR=baeldung-agent
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# compile
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mkdir -p out/${DIR}
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javac -d out/${DIR} $(find ${DIR} -type f -name "*.java")
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# package
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mkdir -p mods
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jar --create --file=mods/${DIR}.jar --manifest=${DIR}/manifest.txt -C out/${DIR} .
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#!/bin/bash
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DIR=baeldung-reflected
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# compile
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mkdir -p out/${DIR}
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javac -d out/${DIR} $(find ${DIR} -type f -name "*.java")
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# package
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mkdir -p mods
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jar --create --file=mods/${DIR}.jar -C out/${DIR} .
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#!/bin/bash
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DIR=baeldung-intermedium
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# compile
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mkdir -p out/${DIR}
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javac -d out/${DIR} $(find ${DIR} -type f -name "*.java")
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# package
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mkdir -p mods
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jar --create --file=mods/${DIR}.jar -C out/${DIR} .
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#!/bin/bash
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DIR=baeldung-reflecting-named
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# compile
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mkdir -p out/${DIR}
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javac -d out/${DIR} --module-path mods $(find ${DIR} -type f -name "*.java")
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# package
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mkdir -p mods
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jar --create --file=mods/${DIR}.jar -C out/${DIR} .
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#!/bin/bash
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DIR=baeldung-reflecting-unnamed
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# compile
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mkdir -p out/${DIR}
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javac -d out/${DIR} $(find ${DIR} -type f -name "*.java")
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# package
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mkdir -p mods
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jar --create --file=mods/${DIR}.jar -C out/${DIR} .
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#!/bin/bash
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java --module-path mods \
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--add-opens baeldung.reflected/com.baeldung.reflected.internal=baeldung.reflecting.named \
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--module baeldung.reflecting.named/com.baeldung.reflecting.named.Main
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#!/bin/bash
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java --module-path mods \
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--add-opens baeldung.reflected/com.baeldung.reflected.internal=baeldung.intermedium \
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--module baeldung.reflecting.named/com.baeldung.reflecting.named.MainWithForwardOpen
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#!/bin/bash
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java --module-path mods \
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-javaagent:mods/baeldung-agent.jar=com.baeldung.reflected.internal.InternalNonPublicClass,com.baeldung.reflecting.named.Main \
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--module baeldung.reflecting.named/com.baeldung.reflecting.named.Main
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#!/bin/bash
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java -cp "mods/*" com.baeldung.reflecting.unnamed.Main
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#!/bin/bash
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java -cp "mods/*" --add-opens java.base/java.lang=ALL-UNNAMED com.baeldung.reflecting.unnamed.Main
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#!/bin/bash
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java -cp "mods/*" -javaagent:mods/baeldung-agent.jar com.baeldung.reflecting.unnamed.Main
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#!/bin/bash
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rm -rf out
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rm -rf mods
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package com.baeldung.agent;
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import java.lang.instrument.Instrumentation;
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import java.util.*;
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public class LoadTimeAgent {
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public static void premain(String agentArgs, Instrumentation inst) {
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System.out.println("agentArgs: " + agentArgs);
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if (agentArgs != null) {
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addExportsAndOpensByClassName(inst, agentArgs);
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}
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else {
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addExportsAndOpensToUnnamedModule(inst);
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}
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}
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private static void addExportsAndOpensByClassName(Instrumentation inst, String agentArgs) {
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String[] array = agentArgs.split(",");
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try {
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String className1 = array[0];
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String className2 = array[1];
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Class<?> clazz1 = Class.forName(className1);
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Class<?> clazz2 = Class.forName(className2);
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Module srcModule = clazz1.getModule();
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Module targetModule = clazz2.getModule();
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redefineModule(inst, srcModule, targetModule);
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} catch (ClassNotFoundException e) {
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e.printStackTrace();
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}
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}
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private static void addExportsAndOpensToUnnamedModule(Instrumentation inst) {
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Module unnamedModule = ClassLoader.getSystemClassLoader().getUnnamedModule();
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Set<Module> modules = ModuleLayer.boot().modules();
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for (Module m : modules) {
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redefineModule(inst, m, unnamedModule);
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}
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}
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private static void redefineModule(Instrumentation inst, Module src, Module target) {
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// prepare extra reads
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Set<Module> extraReads = Collections.singleton(target);
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// prepare extra exports
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Set<String> packages = src.getPackages();
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Map<String, Set<Module>> extraExports = new HashMap<>();
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for (String pkg : packages) {
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extraExports.put(pkg, extraReads);
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}
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// prepare extra opens
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Map<String, Set<Module>> extraOpens = new HashMap<>();
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for (String pkg : packages) {
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extraOpens.put(pkg, extraReads);
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}
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// prepare extra uses
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Set<Class<?>> extraUses = Collections.emptySet();
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// prepare extra uses
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Map<Class<?>, List<Class<?>>> extraProvides = Collections.emptyMap();
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// redefine module
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inst.redefineModule(src, extraReads, extraExports, extraOpens, extraUses, extraProvides);
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}
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}
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Premain-Class: com.baeldung.agent.LoadTimeAgent
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Can-Redefine-Classes: true
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Can-Retransform-Classes: true
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module baeldung.agent {
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requires java.instrument;
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}
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package com.baeldung.intermedium;
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public class ForwardOpen {
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public static void addOpens(Class<?> clazz1, Class<?> clazz2) {
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Module currentModule = ForwardOpen.class.getModule();
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Module srcModule = clazz1.getModule();
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Module targetModule = clazz2.getModule();
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System.out.println("current module: " + currentModule.getName());
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System.out.println("source module: " + srcModule.getName());
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System.out.println("target module: " + targetModule.getName());
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srcModule.addOpens(clazz1.getPackageName(), targetModule);
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}
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}
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module baeldung.intermedium {
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exports com.baeldung.intermedium;
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}
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package com.baeldung.reflected.exported;
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class ExportedNonPublicClass {
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public static void testPublicStaticMethod() {
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System.out.println("ExportedNonPublicClass.testPublicStaticMethod()");
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}
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private static void testPrivateStaticMethod() {
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System.out.println("ExportedNonPublicClass.testPrivateStaticMethod()");
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}
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}
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package com.baeldung.reflected.exported;
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public class ExportedPublicClass {
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public static void testPublicStaticMethod() {
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System.out.println("ExportedPublicClass.testPublicStaticMethod()");
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}
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private static void testPrivateStaticMethod() {
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System.out.println("ExportedPublicClass.testPrivateStaticMethod()");
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}
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}
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package com.baeldung.reflected.internal;
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class InternalNonPublicClass {
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public static void testPublicStaticMethod() {
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System.out.println("InternalNonPublicClass.testPublicStaticMethod()");
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}
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private static void testPrivateStaticMethod() {
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System.out.println("InternalNonPublicClass.testPrivateStaticMethod()");
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}
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}
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package com.baeldung.reflected.internal;
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public class InternalPublicClass {
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public static void testPublicStaticMethod() {
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System.out.println("InternalPublicClass.testPublicStaticMethod()");
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}
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private static void testPrivateStaticMethod() {
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System.out.println("InternalPublicClass.testPrivateStaticMethod()");
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}
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}
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package com.baeldung.reflected.opened;
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class OpenedNonPublicClass {
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public static void testPublicStaticMethod() {
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System.out.println("OpenedNonPublicClass.testPublicStaticMethod()");
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}
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private static void testPrivateStaticMethod() {
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System.out.println("OpenedNonPublicClass.testPrivateStaticMethod()");
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}
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}
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package com.baeldung.reflected.opened;
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public class OpenedPublicClass {
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public static void testPublicStaticMethod() {
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System.out.println("OpenedPublicClass.testPublicStaticMethod()");
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}
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private static void testPrivateStaticMethod() {
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System.out.println("OpenedPublicClass.testPrivateStaticMethod()");
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}
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}
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module baeldung.reflected {
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exports com.baeldung.reflected.exported;
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opens com.baeldung.reflected.opened;
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}
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package com.baeldung.reflecting.named;
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import java.lang.reflect.Method;
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public class Main {
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public static void main(String[] args) throws Exception {
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Class<?> clazz = Class.forName("com.baeldung.reflected.internal.InternalNonPublicClass");
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Method method = clazz.getDeclaredMethod("testPrivateStaticMethod");
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method.setAccessible(true);
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method.invoke(null);
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}
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}
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package com.baeldung.reflecting.named;
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import com.baeldung.intermedium.ForwardOpen;
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import java.lang.reflect.Method;
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public class MainWithForwardOpen {
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public static void main(String[] args) throws Exception {
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Class<?> currentClass = Main.class;
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Class<?> clazz = Class.forName("com.baeldung.reflected.internal.InternalNonPublicClass");
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ForwardOpen.addOpens(clazz, currentClass);
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Method method = clazz.getDeclaredMethod("testPrivateStaticMethod");
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method.setAccessible(true);
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method.invoke(null);
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}
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}
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module baeldung.reflecting.named {
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requires baeldung.intermedium;
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requires baeldung.reflected;
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}
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package com.baeldung.reflecting.unnamed;
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import java.lang.reflect.Field;
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public class Main {
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public static void main(String[] args) throws Exception {
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Class<?> clazz = StringBuilder.class;
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Field f = clazz.getDeclaredField("serialVersionUID");
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f.setAccessible(true);
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Object value = f.get(null);
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System.out.println(value);
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}
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}
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