russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
65 lines
2.8 KiB
Java
65 lines
2.8 KiB
Java
/*
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* Copyright (c) 2024, 2025, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.lang.classfile.ClassFile;
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import java.lang.classfile.MethodModel;
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import java.lang.instrument.ClassFileTransformer;
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import java.lang.instrument.Instrumentation;
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import java.security.ProtectionDomain;
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/**
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* This agent removes the isHeadless method from java.awt.GraphicsEnvironment.
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*/
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public class HeadlessMalfunctionAgent {
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public static void premain(String agentArgs, Instrumentation inst) {
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inst.addTransformer(new ClassFileTransformer() {
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@Override
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public byte[] transform(ClassLoader loader,
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String className,
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Class<?> classBeingRedefined,
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ProtectionDomain pd,
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byte[] cb) {
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if (!"java/awt/GraphicsEnvironment".equals(className)) {
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return null;
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}
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System.out.println("Transforming java.awt.GraphicsEnvironment.");
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try {
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return ClassFile.of().transformClass(ClassFile.of().parse(cb), (classBuilder, element) -> {
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if (element instanceof MethodModel method) {
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if ("isHeadless".equals(method.methodName().stringValue()) &&
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"()Z".equals(method.methodType().stringValue())) {
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System.out.println("isHeadless removed from java.awt.GraphicsEnvironment.");
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return;
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}
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}
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classBuilder.with(element);
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});
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} catch (Exception e) {
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e.printStackTrace();
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return null;
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}
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}
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});
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}
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}
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