org.gridkit.lab.jvm.attach.AttachAPI Maven / Gradle / Ivy
/**
* Copyright 2013 Alexey Ragozin
*
* 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 org.gridkit.lab.jvm.attach;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLClassLoader;
/**
* @author Alexey Ragozin ([email protected])
*/
class AttachAPI {
private static final LogStream LOG_ERROR = LogStream.error();
private static boolean started;
static {
try {
String javaHome = System.getProperty("java.home");
String toolsJarURL = "file:" + javaHome + "/../lib/tools.jar";
// Make addURL public
Method method = URLClassLoader.class.getDeclaredMethod("addURL", URL.class);
method.setAccessible(true);
URLClassLoader sysloader = (URLClassLoader)ClassLoader.getSystemClassLoader();
if (sysloader.getResourceAsStream("/com/sun/tools/attach/VirtualMachine.class") == null) {
method.invoke(sysloader, (Object) new URL(toolsJarURL));
Thread.currentThread().getContextClassLoader().loadClass("com.sun.tools.attach.VirtualMachine");
Thread.currentThread().getContextClassLoader().loadClass("com.sun.tools.attach.AttachNotSupportedException");
}
} catch (Exception e) {
LOG_ERROR.log("Java home points to " + System.getProperty("java.home") + " make sure it is not a JRE path");
LOG_ERROR.log("Failed to add tools.jar to classpath", e);
}
started = true;
};
public static void ensureToolsJar() {
if (!started) {
LOG_ERROR.log("Attach API not initialized");
}
}
}