I'm trying to attach to a running JVM to debug it using the Virtual Machine class in java. I'm currently have java 8, with jdk1.8.0_11. I have tried to add a manifest to it, with but to no avail. I'm also importing the tools.jar file from my JDK\libs folder.
My code:
import java.io.IOException;
import java.util.List;
import com.sun.tools.attach.AgentInitializationException;
import com.sun.tools.attach.AgentLoadException;
import com.sun.tools.attach.AttachNotSupportedException;
import com.sun.tools.attach.VirtualMachine;
import com.sun.tools.attach.VirtualMachineDescriptor;
public class loadVM {
public static void main(String[] args) {
String name = "replaceAfterNameFound";
List <VirtualMachineDescriptor> vms = VirtualMachine.list();
for (VirtualMachineDescriptor vmd: vms) {
System.out.println(vmd.displayName());
if (vmd.displayName().equals(name)) {
try {
VirtualMachine vm = VirtualMachine.attach(vmd.id());
String agent = "";
vm.loadAgent(agent);
} catch(AttachNotSupportedException e) {
e.printStackTrace();
} catch(IOException e) {
e.printStackTrace();
} catch(AgentLoadException e) {
e.printStackTrace();
} catch(AgentInitializationException e) {
e.printStackTrace();
}
}
}
}
}
Here is a copy of the error I get when running it:
java.util.ServiceConfigurationError:com.sun.tools.attach.spi.AttachProvider:
Provider sun.tools.attach.WindowsAttachProvider could not be
instantiated
Thank you guys for all your help!
Related
I am very new to Java and the RMI system. I am following a tutorial but I am unsure why I keep getting the following errors[1]
[1]: https://i.stack.imgur.com/xeYTn.png
I have attached the code (taken directly from the tutorial here: https://docs.oracle.com/javase/1.5.0/docs/guide/rmi/hello/hello-world.html)
I have tried:
removing any lines with 'package'
changing classpath variables
reinstalling java and javac
setting classpath in the 'rmiregistry &' command
Any help would be appreciated
edit: forgot to attach the code.
Hello.java
import java.rmi.Remote;
import java.rmi.RemoteException;
public interface Hello extends Remote {
String sayHello() throws RemoteException;
}
Client.java
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
public class Client {
private Client() {
}
public static void main(String[] args) {
String host = (args.length < 1) ? null : args[0];
try {
Registry registry = LocateRegistry.getRegistry(host);
Hello stub = (Hello) registry.lookup("Hello");
String response = stub.sayHello();
System.out.println("response: " + response);
} catch (Exception e) {
System.err.println("Client exception: " + e.toString());
e.printStackTrace();
}
}
}
Server.java
import java.rmi.registry.Registry;
import java.rmi.registry.LocateRegistry;
import java.rmi.Remote;
import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;
public class Server implements Hello {
public Server() {
}
public String sayHello() {
return "Hello, world!";
}
public static void main(String args[]) {
try {
Server obj = new Server();
Hello stub = (Hello) UnicastRemoteObject.exportObject((Remote) obj, 0);
// Bind the remote object's stub in the registry
Registry registry = LocateRegistry.getRegistry();
registry.bind("Hello", stub);
System.err.println("Server ready");
} catch (Exception e) {
System.err.println("Server exception: " + e.toString());
e.printStackTrace();
}
}
}
You have to run the command rmiregistry & in the folder the code is compiled into. In this case, "files"
the "getting started" tutorial didn't mention that.
I am currently developing a game using libgdx and java. I am wanting to run some JUnit tests on some of the features of my game, however I am having difficulties loading in my assets. I have tried to implement Mockito so that I can make headless JUnit tests to see if this helped solved the problem but this has not helped. Here is the test class that I am trying to load an asset in (the asset is being loaded on line 17)
import com.kroy.game.FireEngine;
import com.kroy.game.Fortress;
import com.kroy.game.Tile;
import org.junit.Test;
import org.junit.runner.RunWith;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
#RunWith(GdxTestRunner.class)
public class FireEngineTests {
Tile testTile = new Tile();
FireEngine testFireEngine = new FireEngine(100, 10, 10, testTile, 10, 100, "fireEngineSprite.png");
Class ReflectionClass = FireEngine.class;
#Test
public void testRefillAmount() {
testFireEngine.refillAmount(50);
assertEquals(50, testFireEngine.getWaterAmount());
testFireEngine.refillAmount(5000);
assertEquals(100, testFireEngine.getWaterAmount());
}
#Test
public void testCanShoot() {
}
#Test
public void testDeath() {
testFireEngine.setHealth(0);
assertTrue(testFireEngine.isDisabled());
}
#Test
public void testTakeDamage() {
try {
testFireEngine.setHealth(100);
Method takeDamageReflection = ReflectionClass.getDeclaredMethod("takeDamage");
takeDamageReflection.setAccessible(true);
takeDamageReflection.invoke(50, takeDamageReflection);
assertEquals(50, testFireEngine.getHealth());
takeDamageReflection.invoke(5000, takeDamageReflection);
assertEquals(0, testFireEngine.getHealth());
} catch (NoSuchMethodException e) {
} catch (InvocationTargetException e) {
} catch (IllegalAccessException e) {
}
}
#Test
public void testTransferTo() {
Tile newLocation = new Tile(2,2);
try {
Method transferToReflection = ReflectionClass.getDeclaredMethod("transferTo");
transferToReflection.setAccessible(true);
transferToReflection.invoke(newLocation, transferToReflection);
assertEquals(testTile.getInhabitant(),null);
assertEquals(newLocation.getInhabitant(), testFireEngine);
} catch (NoSuchMethodException e) {
} catch (InvocationTargetException e) {
} catch (IllegalAccessException e) {
}
}
#Test
public void testShootTarget() {
Fortress testFortress = new Fortress(1000, 10,2,testTile, "fortress1", "lavaTile.png");
testFireEngine.shootTarget(testFortress);
assertEquals(testFortress.getHealth(), (testFortress.getMaxHealth() - testFireEngine.getDamage()));
assertEquals(99, testFireEngine.getWaterAmount());
}
}
Here is the error message that I get for each of the tests that I try to run:
com.badlogic.gdx.utils.GdxRuntimeException: Asset not loaded: /Users/michaelShepherd/Documents/University Work/Year 2/SEPR/Assessment 3/Septagon3/tests/assets/fireEngineSprite.png
The searched for file is definitely in that location specified and I have also made the assets folder the resouces root for this module, yet still the file does not load.
Any suggestions?
I am not sure how you work with textures in FireEngine class but you probably need to load and access textures through AssetManager as you usually do in game.
I have a java project and i'm trying to include a solr server into my project and start it.
I copy de folders of the server into my eclipse structhure and start the server with Runtime.getRuntime().exec("path/solr.cmd start") but when I create the Runnable jar it doesn't work.
can you help me?
thanks
package prueba_solr;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URISyntaxException;
import javax.swing.JOptionPane;
public class arrancar {
public static void main(String[] args) {
try {
// Arrancar el servidor Apache SOLR
arrancar();
} catch (Exception e) {
System.out.println(e);
JOptionPane.showMessageDialog(null, e);
}
}
private static void arrancar() {
System.out.println("Arrancando...");
String comando = "./bin/models/ir/bin/solr.cmd start"; // SI EN ECLIPSE. NO EN EL JAR
try {
JOptionPane.showMessageDialog(null,comando);
Runtime.getRuntime().exec(comando);
} catch (IOException e) {
System.out.println(e);
JOptionPane.showMessageDialog(null, e);
}
}
}
I'm working at the moment on a Mod for Minecraft with a dedicated Gui system written in C++ and Qt5. I let my GUI and Minecraft communicate through a named pipe, but I have there a small problem. I can read and write with a simple Java and C++(Qt) program into the pipe. But when I create a new instance of my Pipeendpoint class in post init of Minecraft Forge it can't read anything from the Pipe. In a standalone system, it can read stuff.
Not working Forge Implementation:
package de.CoderDE.CodersAnimationEditor;
import java.io.FileNotFoundException;
import de.CoderDE.CodersAnimationEditor.Pipe.PipeEndpoint;
import net.minecraft.client.Minecraft;
import net.minecraftforge.fml.client.registry.ClientRegistry;
import net.minecraftforge.fml.common.event.FMLInitializationEvent;
import net.minecraftforge.fml.common.event.FMLPostInitializationEvent;
import net.minecraftforge.fml.common.event.FMLPreInitializationEvent;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;
#SideOnly(Side.CLIENT)
public class ClientProxy extends CommonProxy {
static PipeEndpoint pendpoint;
#Override
public void preInit(FMLPreInitializationEvent e) {
super.preInit(e);
}
#Override
public void init(FMLInitializationEvent e) {
super.init(e);
}
#Override
public void postInit(FMLPostInitializationEvent e) {
super.postInit(e);
try {
pendpoint = new PipeEndpoint();
} catch (FileNotFoundException e1) {
e1.printStackTrace();
}
try {
Thread.sleep(10000);
} catch (InterruptedException e1) {
e1.printStackTrace();
}
}
}
Working standalone implementation:
import java.io.FileNotFoundException;
import de.CoderDE.CodersAnimationEditor.Pipe.PipeEndpoint;
public class Main {
static PipeEndpoint pipe;
public static void main(String[] args) {
try {
pipe = new PipeEndpoint();
} catch (FileNotFoundException e1) {
e1.printStackTrace();
}
try {
Thread.sleep(10000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
And the important PipeEndpoint class:
package de.CoderDE.CodersAnimationEditor.Pipe;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
public class PipeEndpoint {
private Thread reciever;
private RandomAccessFile pipe;
public PipeEndpoint() throws FileNotFoundException {
pipe = new RandomAccessFile("\\\\.\\pipe\\CodersAnimationEditor", "rw");
reciever = new Thread(new PipeEndpointReciever());
reciever.start();
}
private class PipeEndpointReciever implements Runnable {
#Override
public void run() {
try {
while (true) {
System.out.print((char)pipe.read());
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
And with "can't read anything" I mean that it never returns from pipe.read().
Oh, and the Java application starts after the C++(Qt) LocalServer started listening and waits for a new connection.
I have two Java applications. One application will contain resource files and will be used as library to other Java application.
First app com.test.resourceusing.MainClass.java which contains res/base.xml resource file.
package com.test.resourceusing;
import java.io.BufferedInputStream;
import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Scanner;
public class MainClass {
public MainClass() {
super();
}
public static void main(String[] args) {
MainClass main = new MainClass();
try {
main.start();
} catch (MalformedURLException e) {
}
}
public void start() throws MalformedURLException {
URL url = getClass().getResource("res/base.xml");
System.out.println(url.getPath());
System.out.println(url.getFile());
File f = new File(url.getFile());
if (f.exists()) {
System.out.println("File exist!");
BufferedInputStream result = (BufferedInputStream)
getClass().getResourceAsStream("res/base.xml");
Scanner scn = new Scanner(result);
while(scn.hasNext()){
System.out.println(scn.next());
}
} else {
System.out.println("Not working! :(");
}
}
}
Result is:
/C:/Work/Projects/ResourceUsing/classes/com/test/resourceusing/res/base.xml
/C:/Work/Projects/ResourceUsing/classes/com/test/resourceusing/res/base.xml
File exist!
<?xml
version='1.0'
encoding='utf-8'?>
<schema>
</schema>
Then I create .jar file which contains all resource files and try to use it as library in other application.
Second app:
resourcetest.MainClassTest.java
package resourcetest;
import com.test.resourceusing.MainClass;
import java.net.MalformedURLException;
public class MainClassTest {
public MainClassTest() {
super();
}
public static void main(String[] args) {
MainClass main = new MainClass();
try {
main.start();
} catch (MalformedURLException e) {
}
}
}
Result is:
file:/C:/Work/Projects/ResourceUsing/deploy/archive1.jar!/com/test/resourceusing/res/base.xml
file:/C:/Work/Projects/ResourceUsing/deploy/archive1.jar!/com/test/resourceusing/res/base.xml
Not working! :(
I don't understand why it's not working, is there problems in my code? Or this solution is not possible in Java?
Do you see the difference in the location of those files?
/C:/Work/Projects/ResourceUsing/classes/com/test/resourceusing/res/base.xml
file:/C:/Work/Projects/ResourceUsing/deploy/archive1.jar!/com/test/resourceusing/res/base.xml
You cannot access a resource that is located in a JAR file with the File API.
Your code is already on the way. A simple edit should work:
public void start() throws IOException {
URL url = getClass().getResource("res/base.xml");
if (url != null) {
System.out.println(url.getPath());
System.out.println(url.getFile());
System.out.println("File exist!");
try(InputStream result = url.openStream()) {
try(Scanner scn = new Scanner(result)) {
while(scn.hasNext()) {
System.out.println(scn.next());
}
}
}
} else {
System.out.println("Not working! :(");
}
}
After deeper searching looks like I found a reason - https://stackoverflow.com/a/10605316/1117515.
In this case I need to use getResourceAsStream().