I've been trying to find ways to obtain the Thread Dump from a Java Application on my Windows server running on jre 1.8.0_144.
Non of the monitoring utilities like jcmd jstack jconsole are available in either the bin or lib folders of the Java environment directory.
I have come across several applications online that claim to perform the same task but haven't found a reliable one yet.
Changing the JRE version, unfortunately, has been ruled out as an option
There is a way if you are running with tools.jar available, that is running from a JDK instead of a stock JRE. However given that you don't have the jcmd, jstack, jconsole tools available, this is unlikely.
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.lang.reflect.Method;
// You need to add tools.jar to the classpath to get this
import com.sun.tools.attach.VirtualMachine;
public class Main {
public static void main(String[] args) throws Exception {
// Here you will need to use JNI or JNA to get the current process' PID
// because the JRE version you are using doesn't have any other way.
long pid = getCurrentPid(); // you need to create this method
VirtualMachine vm = VirtualMachine.attach(""+pid);
Method m = vm.getClass().getMethod("remoteDataDump", Object[].class);
InputStream in = (InputStream) m.invoke(vm, new Object[] { new Object[0] } ); // awkward due to nested var-args
try (BufferedReader buffer = new BufferedReader(new InputStreamReader(in))) {
buffer.lines().forEach(System.out::println);
}
}
}