CrossJeeves Works!

.classpath

@@ -2,7 +2,7 @@
 <classpath>
 	<classpathentry kind="src" path="src"/>
 	<classpathentry kind="src" path="test"/>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/J2SE-1.5"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.6"/>
 	<classpathentry kind="con" path="org.eclipse.jdt.junit.JUNIT_CONTAINER/4"/>
 	<classpathentry kind="lib" path="/tool/junit4/mockito-core-2.28.2.jar"/>
 	<classpathentry kind="lib" path="/tool/junit4/byte-buddy-1.9.16.jar"/>

.settings/org.eclipse.jdt.core.prefs

@@ -1,11 +1,11 @@
 eclipse.preferences.version=1
 org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
-org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.5
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.6
 org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
-org.eclipse.jdt.core.compiler.compliance=1.5
+org.eclipse.jdt.core.compiler.compliance=1.6
 org.eclipse.jdt.core.compiler.debug.lineNumber=generate
 org.eclipse.jdt.core.compiler.debug.localVariable=generate
 org.eclipse.jdt.core.compiler.debug.sourceFile=generate
 org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
 org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
-org.eclipse.jdt.core.compiler.source=1.5
+org.eclipse.jdt.core.compiler.source=1.6

src/com/flaremicro/crossjeeves/AgentInfo.java

@@ -11,4 +11,9 @@ public class AgentInfo {
 		this.addr = addr;
 		this.port = port;
 	}
+	
+	public String toString()
+	{
+		return addr.toString() + " " + port;
+	}
 }

src/com/flaremicro/crossjeeves/CrossJeevesClient.java

@@ -18,14 +18,16 @@ public class CrossJeevesClient {
 	}
 
 	public void beginJob() {
+		System.out.println("Trying to connect to agent");
 		for(int i = 0; i < MAX_ATTEMPTS; i++)
 		{
 			for(AgentInfo agent : agentList)
 			{
+				System.out.println("Trying agent " + agent.toString());
 				int exitCode = ClientHandler.connect(agent.addr, agent.port, script);
 				if(ErrorCodes.getErrorCode(exitCode) == null || ErrorCodes.getErrorCode(exitCode).isTerminal)
 				{
-					System.out.println("Recieved terminal exit code " + exitCode);
+					System.err.println("Recieved terminal exit code " + exitCode);
 					System.exit(exitCode);
 				}
 				else if(exitCode == ErrorCodes.OK.id)
@@ -34,7 +36,19 @@ public class CrossJeevesClient {
 					System.exit(0);
 				}
 			}
+			try
+			{
+				Thread.sleep(1000L);
+				System.out.println("Failed every agent, retrying...");
 			}
+			catch (InterruptedException e)
+			{
+				// TODO Auto-generated catch block
+				e.printStackTrace();
+			}
+		}
+		System.err.println("Failed every attempt!");
+		System.exit(ErrorCodes.CONNECT_FAILED.id);
 	}
 
 }

src/com/flaremicro/crossjeeves/CrossJeevesHost.java

@@ -49,6 +49,7 @@ public class CrossJeevesHost {
 				//TODO properties!
 				ServerHandler handler = new ServerHandler(sock, this, new Properties());
 				connections.add(handler);
+				handler.init();
 			}
 			catch (IOException ex)
 			{

src/com/flaremicro/crossjeeves/CrossJeevesMain.java

@@ -52,10 +52,10 @@ public class CrossJeevesMain {
 					System.out.println("IP must be specified");
 					System.exit(1);
 				}
-				String ipStr = args[0];
+				String ipStr = agentArgs[0];
 				String portStr = "10801";
-				if(args.length >= 2)
+				if(agentArgs.length >= 2)
-					portStr = args[1];
+					portStr = agentArgs[1];
 				try
 				{
 					int port = Integer.parseInt(portStr);

src/com/flaremicro/crossjeeves/ScriptProcessor.java

@@ -22,8 +22,11 @@ import org.xml.sax.InputSource;
 
 import com.flaremicro.crossjeeves.net.ErrorCodes;
 import com.flaremicro.crossjeeves.net.NetworkHandler;
+import com.flaremicro.crossjeeves.net.StreamForwarder;
 import com.flaremicro.crossjeeves.net.packet.Packet;
 import com.flaremicro.crossjeeves.net.packet.Packet3Clone;
+import com.flaremicro.crossjeeves.net.packet.Packet7LogEntry;
+import com.flaremicro.util.Util;
 import com.flaremicro.util.ZipUtils;
 
 public class ScriptProcessor {
@@ -34,6 +37,7 @@ public class ScriptProcessor {
 	private Random random = new Random();
 	private Thread executionThread = null;
 	private File workspace = null;
+	private File workingDirectory = null;
 	private boolean terminated = false;
 	
 	public ScriptProcessor(NetworkHandler netHandler, File workspace, Properties properties) {
@@ -65,6 +69,7 @@ public class ScriptProcessor {
 	}
 
 	public void processScript(String script) throws ScriptProcessingException {
+		workingDirectory = workspace;
 		if(terminated)
 			throw new ScriptProcessingException("Processor has been terminated");
 		DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
@@ -76,6 +81,19 @@ public class ScriptProcessor {
 
 			NodeList nodeList = doc.getDocumentElement().getChildNodes();
 
+			processScriptNodes(nodeList);
+		}
+		catch (ScriptProcessingException ex)
+		{
+			throw ex;
+		}
+		catch (Exception ex)
+		{
+			throw new ScriptProcessingException("Script threw an exception during processing" ,ex);
+		}
+	}
+
+	private void processScriptNodes(NodeList nodeList) throws ScriptProcessingException {
 		for (int i = 0; i < nodeList.getLength(); i++)
 		{
 			if(terminated)
@@ -114,6 +132,11 @@ public class ScriptProcessor {
 			{
 				powershellProcessor(e);
 			}
+
+			else if (name.equalsIgnoreCase("dir"))
+			{
+				dirProcessor(e);
+			}
 			else if (name.equalsIgnoreCase("artifacts"))
 			{
 				artifactProcessor(e);
@@ -124,14 +147,13 @@ public class ScriptProcessor {
 			}
 		}
 	}
-		catch (ScriptProcessingException ex)
+
-		{
+	private void dirProcessor(Element e) throws ScriptProcessingException {
-			throw ex;
+		NodeList nodeList = e.getChildNodes();
-		}
+		File lastWorkingDirectory = this.workingDirectory;
-		catch (Exception ex)
+		this.workingDirectory = new File(workingDirectory, this.requireAttribute(e, "path"));
-		{
+		this.processScriptNodes(nodeList);
-			throw new ScriptProcessingException("Script threw an exception during processing" ,ex);
+		this.workingDirectory = lastWorkingDirectory;
-		}
 	}
 
 	public void environmentProcessor(Element e) throws ScriptProcessingException {
@@ -167,7 +189,7 @@ public class ScriptProcessor {
 		File file = netHandler.waitForFile(id);
 		if (file == null)
 			throw new ScriptProcessingException("File failed to transfer");
-		if(!ZipUtils.unzipDirectory(file, workspace));
+		if(!ZipUtils.unzipDirectory(file, workspace))
 			throw new ScriptProcessingException("File failed to decompress");
 	}
 
@@ -204,8 +226,10 @@ public class ScriptProcessor {
 
 	public int beginProcess(String... args) throws ScriptProcessingException {
 		ProcessBuilder processBuilder = new ProcessBuilder(args);
+		processBuilder.directory(workspace);
 		Map<String, String> environment = processBuilder.environment();
 
+		
 		for (Entry<String, String> set : currentEnvironment.entrySet())
 		{
 			environment.put(set.getKey(), set.getValue());
@@ -216,13 +240,31 @@ public class ScriptProcessor {
 		try
 		{
 			runningProcess = processBuilder.start();
-			return runningProcess.exitValue();
+
+			StreamForwarder stdOutForwarder = new StreamForwarder(netHandler, runningProcess.getInputStream(), Packet7LogEntry.STD_OUT);
+			StreamForwarder stdErrForwarder = new StreamForwarder(netHandler, runningProcess.getErrorStream(), Packet7LogEntry.STD_ERR);
+			
+			stdOutForwarder.startAsync();
+			stdErrForwarder.startAsync();
+			
+			int exit = runningProcess.waitFor();
+			
+			stdOutForwarder.end();
+			stdErrForwarder.end();
+			
+			return exit;
 		}
 		catch (IOException ex)
 		{
 			runningProcess = null;
 			throw new ScriptProcessingException("Unable to run batch script: " + ex.getMessage(), ex);
 		}
+		catch (InterruptedException ex)
+		{
+			runningProcess.destroy();
+			runningProcess = null;
+			throw new ScriptProcessingException("Batch script interrupted: " + ex.getMessage(), ex);
+		}
 	}
 
 	private void batchProcessor(Element e) throws ScriptProcessingException {
@@ -267,10 +309,11 @@ public class ScriptProcessor {
 					try
 					{
 						processScript(script);
+						netHandler.disconnect(ErrorCodes.OK.id, "Script completed successfully!");
 					}
 					catch (ScriptProcessingException e)
 					{
-						netHandler.disconnect(ErrorCodes.SCRIPT_ERROR.id, e.toString());
+						netHandler.disconnect(ErrorCodes.SCRIPT_ERROR.id, Util.getStackTrace(e));
 						e.printStackTrace();
 					}
 					finally

src/com/flaremicro/crossjeeves/net/ClientHandler.java

@@ -18,6 +18,7 @@ import com.flaremicro.crossjeeves.net.packet.Packet3Clone;
 import com.flaremicro.crossjeeves.net.packet.Packet4FileData;
 import com.flaremicro.crossjeeves.net.packet.Packet5Artifact;
 import com.flaremicro.crossjeeves.net.packet.Packet6Disconnect;
+import com.flaremicro.crossjeeves.net.packet.Packet7LogEntry;
 import com.flaremicro.util.Util;
 import com.flaremicro.util.ZipUtils;
 
@@ -30,6 +31,7 @@ public class ClientHandler extends NetworkHandler {
 	}
 	
 	private void init() {
+		System.out.println("CrossJeeves connected! Sending Identify packet...");
 		enqueue(new Packet0Identify(0));
 		this.beginWriteThread();
 		this.beginReading();
@@ -48,6 +50,7 @@ public class ClientHandler extends NetworkHandler {
 		}
 		else
 		{
+			System.out.println("Got good identify packet response! Sending script...");
 			enqueue(new Packet2Script(script));
 		}
 	}
@@ -147,4 +150,12 @@ public class ClientHandler extends NetworkHandler {
 		}
 	}
 
+	@Override
+	public void handlePacket(Packet7LogEntry packet) {
+		if(packet.getStdOutput() == Packet7LogEntry.STD_ERR)
+			System.err.println(packet.getLogEntry());
+		else
+			System.out.println(packet.getLogEntry());
+	}
+
 }

src/com/flaremicro/crossjeeves/net/ErrorCodes.java

@@ -4,11 +4,14 @@ package com.flaremicro.crossjeeves.net;
  * Consider replacing with enum in the near future.
  */
 public class ErrorCodes {
+
+	private static final ErrorCodes codes[] = new ErrorCodes[13];
+	
 	public static final ErrorCodes OK = new ErrorCodes(0, false);
 	public static final ErrorCodes READ_FAILED = new ErrorCodes(1, false);
 	public static final ErrorCodes WRITE_FAILED = new ErrorCodes(2, false);
 	public static final ErrorCodes THREAD_INTERRUPTED = new ErrorCodes(3, false);
-	public static final ErrorCodes SCRIPT_ERROR = new ErrorCodes(4, false);
+	public static final ErrorCodes SCRIPT_ERROR = new ErrorCodes(4, true);
 	public static final ErrorCodes FILE_DOWNLOAD_FAILURE = new ErrorCodes(5, false);
 	public static final ErrorCodes FILE_UPLOAD_FAILURE = new ErrorCodes(6, false);
 	public static final ErrorCodes INVALID_PACKET_RECIEVED = new ErrorCodes(7, false);
@@ -18,8 +21,6 @@ public class ErrorCodes {
 	public static final ErrorCodes AGENT_TERMINATED = new ErrorCodes(11, false);
 	public static final ErrorCodes CONNECT_FAILED = new ErrorCodes(12, false);
 
-	private static final ErrorCodes codes[] = new ErrorCodes[12];
-	
 	public final int id;
 	public final boolean isTerminal;
 	public ErrorCodes(int id, boolean isTerminal)

src/com/flaremicro/crossjeeves/net/NetworkHandler.java

@@ -22,6 +22,7 @@ import com.flaremicro.crossjeeves.net.packet.Packet3Clone;
 import com.flaremicro.crossjeeves.net.packet.Packet4FileData;
 import com.flaremicro.crossjeeves.net.packet.Packet5Artifact;
 import com.flaremicro.crossjeeves.net.packet.Packet6Disconnect;
+import com.flaremicro.crossjeeves.net.packet.Packet7LogEntry;
 import com.flaremicro.util.Util;
 
 import static com.flaremicro.crossjeeves.net.ErrorCodes.*;
@@ -31,6 +32,7 @@ public abstract class NetworkHandler {
 	private Socket socket;
 	private DataInputStream in;
 	private DataOutputStream out;
+	private Thread writeThread;
 	private Thread readThread;
 	private int exitCode = 0;
 	private HashMap<Long, FileTransferInfo> downloadQueue = new HashMap<Long, FileTransferInfo>();
@@ -49,7 +51,11 @@ public abstract class NetworkHandler {
 		{
 			while (true)
 			{
+				synchronized (downloadComplete)
+				{
+					if (!downloadComplete.containsKey(fileId))
 						downloadComplete.wait();
+				}
 				File file = downloadComplete.get(fileId);
 				if (file != null)
 					return file;
@@ -67,7 +73,14 @@ public abstract class NetworkHandler {
 	}
 
 	public void enqueue(Packet packet) {
-		outbox.add(packet);
+		try
+		{
+			outbox.put(packet);
+		}
+		catch (InterruptedException e)
+		{
+			e.printStackTrace();
+		}
 	}
 
 	public void process(Packet packet) {
@@ -75,14 +88,18 @@ public abstract class NetworkHandler {
 	}
 
 	public void disconnect(int code, String message) {
+		if (isConnected())
+		{
 			System.out.println("Disconnect code " + code + ": " + message);
 			doDisconnect(code);
 		}
+	}
 
 	protected void doDisconnect(int exitCode) {
 		this.exitCode = exitCode;
 		connected = false;
-		readThread.interrupt();
+		if (writeThread != null)
+			writeThread.interrupt();
 		Util.cleanClose(in);
 		Util.cleanClose(out);
 		Util.cleanClose(socket);
@@ -98,7 +115,7 @@ public abstract class NetworkHandler {
 			try
 			{
 				int opcode = in.readByte();
-				Packet packet = Packet.opToPacket.get(opcode);
+				Packet packet = Packet.opToPacket.get((byte) opcode);
 				if (packet != null)
 				{
 					packet = packet.cloneTypeOnly();
@@ -107,15 +124,32 @@ public abstract class NetworkHandler {
 				}
 			}
 			catch (IOException e)
+			{
+				if (connected)
 				{
 					e.printStackTrace();
 					disconnect(READ_FAILED.id, e.toString());
 				}
 			}
 		}
+	}
+
+	protected void beginReadThread() {
+		if (readThread == null)
+		{
+			readThread = new Thread(new Runnable() {
+				public void run() {
+					beginReading();
+				}
+			});
+			readThread.start();
+		}
+	}
 
 	protected void beginWriteThread() {
-		readThread = new Thread(new Runnable() {
+		if (writeThread == null)
+		{
+			writeThread = new Thread(new Runnable() {
 				public void run() {
 					while (connected)
 					{
@@ -136,14 +170,19 @@ public abstract class NetworkHandler {
 							}
 						}
 						catch (InterruptedException e)
+						{
+							if (connected)
 							{
 								disconnect(THREAD_INTERRUPTED.id, e.toString());
 								e.printStackTrace();
 							}
 						}
 					}
+					writeThread = null;
+				}
 			});
-		readThread.start();
+			writeThread.start();
+		}
 	}
 
 	public abstract void handlePacket(Packet packet);
@@ -162,6 +201,8 @@ public abstract class NetworkHandler {
 
 	public abstract void handlePacket(Packet6Disconnect packet);
 	
+	public abstract void handlePacket(Packet7LogEntry packet);
+
 	public abstract void handlePacket(Packet127KeepAlive packet);
 
 	public void clearFile(long fileId) {
@@ -203,8 +244,11 @@ public abstract class NetworkHandler {
 		{
 			Util.cleanClose(fileTransferInfo);
 			this.downloadComplete.put(fileId, fileTransferInfo.file);
+			synchronized (this.downloadComplete)
+			{
 				this.downloadComplete.notifyAll();
 			}
+		}
 		else
 		{
 			fileTransferInfo.outputStream.write(chunk);

src/com/flaremicro/crossjeeves/net/ServerHandler.java

@@ -19,6 +19,7 @@ import com.flaremicro.crossjeeves.net.packet.Packet3Clone;
 import com.flaremicro.crossjeeves.net.packet.Packet5Artifact;
 import com.flaremicro.crossjeeves.net.packet.Packet4FileData;
 import com.flaremicro.crossjeeves.net.packet.Packet6Disconnect;
+import com.flaremicro.crossjeeves.net.packet.Packet7LogEntry;
 
 public class ServerHandler extends NetworkHandler {
 	private CrossJeevesHost host;
@@ -31,6 +32,20 @@ public class ServerHandler extends NetworkHandler {
 		this.scriptProcessor = new ScriptProcessor(this, workspace, properties);
 	}
 	
+	public void disconnect(int code, String message) {
+		enqueue(new Packet6Disconnect(code, message));
+		try
+		{
+			Thread.sleep(1000L);
+		}
+		catch (InterruptedException e)
+		{
+			if(isConnected())
+				e.printStackTrace();
+		}
+		super.disconnect(code, message);
+	}
+	
 	@Override
 	protected void doDisconnect(int exitCode)
 	{
@@ -46,6 +61,7 @@ public class ServerHandler extends NetworkHandler {
 
 	@Override
 	public void handlePacket(Packet0Identify packet) {
+		System.out.println("Got valid identify packet with flags " + packet.getFlags() + " and version " + packet.getProtocolVersion());
 		enqueue(new Packet0Identify(0));
 	}
 
@@ -61,7 +77,14 @@ public class ServerHandler extends NetworkHandler {
 
 	@Override
 	public void handlePacket(Packet3Clone packet) {
-		disconnect(INVALID_PACKET_RECIEVED.id, "Recieved invalid packet " + packet.getId() + " (Clone)");
+		try
+		{
+			this.beginFile(packet.getFileID(), packet.getFileSize());
+		}
+		catch (IOException e)
+		{
+			disconnect(FILE_DOWNLOAD_FAILURE.id, "Failed to start download of transferred file");
+		}
 	}
 
 	@Override
@@ -92,4 +115,15 @@ public class ServerHandler extends NetworkHandler {
 		doDisconnect(packet.getCode());
 	}
 
+	public void init() {
+		this.beginWriteThread();
+		this.beginReadThread();
+	}
+
+	@Override
+	public void handlePacket(Packet7LogEntry packet) {
+		// TODO Auto-generated method stub
+		
+	}
+
 }

src/com/flaremicro/crossjeeves/net/StreamForwarder.java

@@ -0,0 +1,98 @@
+package com.flaremicro.crossjeeves.net;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+
+import com.flaremicro.crossjeeves.net.packet.Packet7LogEntry;
+import com.flaremicro.util.Util;
+
+/* TODO
+ * Forward output from entire process, rather than just from started processes?
+ */
+public class StreamForwarder {
+	private InnerThread innerThread;
+
+	public StreamForwarder(NetworkHandler handler, InputStream processInput, byte stdType) {
+		innerThread = new InnerThread(handler, processInput, stdType);
+	}
+
+	public void startAsync() {
+		innerThread.start();
+	}
+
+	public void end() {
+		innerThread.stop();
+	}
+
+	private class InnerThread implements Runnable {
+		private Thread parent = null;
+		private final NetworkHandler handler;
+		private final InputStream processInput;
+		private final byte stdType;
+		private boolean isRunning = false;
+
+		public InnerThread(NetworkHandler handler, InputStream processInput, byte stdType) {
+			this.handler = handler;
+			this.processInput = processInput;
+			this.stdType = stdType;
+		}
+
+		public void stop() {
+			isRunning = false;
+		}
+
+		public void start() {
+			if (!isRunning && parent != null)
+			{
+				isRunning = true;
+				parent = new Thread(this);
+				parent.start();
+			}
+		}
+		
+		public void print(String s)
+		{
+			if(stdType == Packet7LogEntry.STD_ERR)
+				System.err.println(s);
+			else
+				System.out.println(s);
+		}
+
+		@Override
+		public void run() {
+			BufferedReader reader = null;
+			try
+			{
+				reader = new BufferedReader(new InputStreamReader(processInput));
+				String line;
+				while (isRunning && (line = reader.readLine()) != null)
+				{
+					handler.enqueue(new Packet7LogEntry(stdType, line));
+					print(line);
+				}
+				if (processInput.available() > 0)
+				{
+					byte[] remaining = new byte[processInput.available()];
+					processInput.read(remaining);
+					line = new String(remaining);
+					print(line);
+					handler.enqueue(new Packet7LogEntry(stdType, line));
+				}
+				parent = null;
+			}
+			catch (IOException ex)
+			{
+				ex.printStackTrace();
+				handler.enqueue(new Packet7LogEntry(stdType, "Error occured:" + ex.toString() + ", logging ended."));
+				print("Error occured, logging ended.");
+			}
+			finally
+			{
+				Util.cleanClose(reader);
+			}
+		}
+	}
+
+}

src/com/flaremicro/util/Util.java

@@ -1,35 +1,37 @@
 package com.flaremicro.util;
 
+import java.io.ByteArrayOutputStream;
 import java.io.Closeable;
 import java.io.IOException;
+import java.io.PrintWriter;
 import java.net.Socket;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.zip.ZipFile;
 
 public class Util {
-	public static Map<String, String> parseArgs(String[] args, boolean toLowercaseKey, boolean exceptOnDuplicateKey)
+	public static Map<String, String> parseArgs(String[] args, boolean toLowercaseKey, boolean exceptOnDuplicateKey) {
-	{
 		Map<String, String> map = new HashMap<String, String>();
-		for(String arg : args)
+		for (String arg : args)
 		{
+			System.out.println(arg);
 			String key, value;
-			if(arg.contains("="))
+			if (arg.contains("="))
 			{
-				String[] param = arg.split("=", 1);
+				String[] param = arg.split("=", 2);
 				key = param[0];
 				value = param[1];
 			}
 			else
 			{
 				key = arg;
-				value = "isset";
+				value = "";
 			}
-			if(!map.containsKey(value))
+			if (!map.containsKey(value))
 			{
 				map.put(key, value);
 			}
-			else if(exceptOnDuplicateKey)
+			else if (exceptOnDuplicateKey)
 			{
 				throw new RuntimeException("Duplicate parameter");
 			}
@@ -38,7 +40,7 @@ public class Util {
 	}
 
 	public static void cleanClose(Closeable closeable) {
-		if(closeable != null)
+		if (closeable != null)
 		{
 			try
 			{
@@ -52,7 +54,7 @@ public class Util {
 	}
 
 	public static void cleanClose(ZipFile zipFile) {
-		if(zipFile != null)
+		if (zipFile != null)
 		{
 			try
 			{
@@ -66,7 +68,7 @@ public class Util {
 	}
 
 	public static void cleanClose(Socket socket) {
-		if(socket != null)
+		if (socket != null)
 		{
 			try
 			{
@@ -78,4 +80,26 @@ public class Util {
 			}
 		}
 	}
+
+	/**
+	 * Get the stacktrace of a {@link Throwable}.
+	 * The stacktrace will be returned in the form of a string. 
+	 */
+	public static String getStackTrace(Throwable ex) {
+		if (ex == null)
+			return "";
+		ByteArrayOutputStream baos = new ByteArrayOutputStream();
+		PrintWriter printWriter = new PrintWriter(baos, true);
+		ex.printStackTrace(printWriter);
+		String stackTrace = baos.toString();
+		try
+		{
+			printWriter.close();
+			baos.close();
+		}
+		catch (IOException dontCare)
+		{
+		}
+		return stackTrace;
+	}
 }

txt.txt

@@ -0,0 +1 @@
+there should be some output

workspace/-1884831558229147979/Test.txt

@@ -0,0 +1 @@
+ 

workspace/-1884831558229147979/abba/Test.txt

@@ -0,0 +1 @@
+ 

workspace/-3407491290024025032/Test.txt

@@ -0,0 +1 @@
+ 

workspace/-3407491290024025032/abba/Test.txt

@@ -0,0 +1 @@
+ 

workspace/-3683641246049409820/Test.txt

@@ -0,0 +1 @@
+ 

workspace/-3683641246049409820/abba/Test.txt

@@ -0,0 +1 @@
+ 

workspace/-3695164149849747891/Test.txt

@@ -0,0 +1 @@
+ 

workspace/-3695164149849747891/abba/Test.txt

@@ -0,0 +1 @@
+ 

workspace/-4423281390745774832/Test.txt

@@ -0,0 +1 @@
+ 

workspace/-4423281390745774832/abba/Test.txt

@@ -0,0 +1 @@
+ 

workspace/-4632459217752892791/Test.txt

@@ -0,0 +1 @@
+ 

workspace/-4632459217752892791/abba/Test.txt

@@ -0,0 +1 @@
+ 

workspace/5444029390664951049/Test.txt

@@ -0,0 +1 @@
+ 

workspace/5444029390664951049/abba/Test.txt

@@ -0,0 +1 @@
+ 

workspace/5872898990672949951/Test.txt

@@ -0,0 +1 @@
+ 

workspace/5872898990672949951/abba/Test.txt

@@ -0,0 +1 @@
+ 

workspace/7258372885358876304/Test.txt

@@ -0,0 +1 @@
+ 

workspace/7258372885358876304/abba/Test.txt

@@ -0,0 +1 @@
+ 

workspace/8784412856913438729/Test.txt

@@ -0,0 +1 @@
+ 

workspace/8784412856913438729/abba/Test.txt

@@ -0,0 +1 @@
+