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Attaches Java Agent in runtime and gives you access to Instrumentation

There is a newer version: 1.6.5

/*
 *    Copyright 2023 Whilein
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

package w.agent;

import com.sun.tools.attach.VirtualMachine;
import lombok.SneakyThrows;
import lombok.experimental.UtilityClass;
import lombok.val;

import java.io.File;
import java.lang.instrument.Instrumentation;

/**
 * @author whilein
 */
@UtilityClass
final class AgentMain {

    @SuppressWarnings("unused")
    private static Instrumentation instrumentation;

    @SneakyThrows
    public void main(final String[] args) {
        val vm = VirtualMachine.attach(args[0]);

        val jar = new File(AgentMain.class.getProtectionDomain().getCodeSource().getLocation().toURI())
                .getPath();

        vm.loadAgent(jar);
    }

    public void premain(final String args, final Instrumentation instrumentation) {
        System.setProperty("wcommons.agent.premain", "true");
        AgentMain.instrumentation = instrumentation;
    }

    @SneakyThrows
    public void agentmain(final String args, final Instrumentation instrumentation) {
        AgentMain.instrumentation = instrumentation;
    }

}