[RESOLVED] problem with java runtime compilation in my jsp file

I've embedded this java code in my test.jsp file (it attempts to compile a file at runtime)

Code:

---

  <%               
                        // Attempt to automatically compile a file.
                        String s = null;
                        String dir = "C:\\Program Files\\Apache Software Foundation\\Tomcat 6.0\\webapps\\eg\\submissions\\msk9\\";
                        String f = dir + "TestPlayer.java";
                       
                        try {
                                Process p = Runtime.getRuntime().exec("javac \"" + f + "\"");
                               
                                BufferedReader stdError = new BufferedReader(new InputStreamReader(p.getErrorStream()));
                               
                                ArrayList array = new ArrayList();
                               
                    while ((s = stdError.readLine()) != null) {
                        array.add(s);
                          }
                               
                                if (array.size() > 0) {
                                        out.println("Your submission had compilation errors:<br><br>");
                                       
                                        for (int i = 0; i < array.size(); i++) {
                                                out.println(array.get(i) + "<br>");
                                        }
                                }
                                else {
                                        out.println("Your submission successfully compiled and has been accepted by the system.");
                                }
                               
                        }
                        catch (IOException e) { }
%>

---

Now when i browse to my test.jsp on the web, the page gives me:

Quote:

---

Your submission had compilation errors:

C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\eg\submissions\msk9\TestPlayer.java:3: cannot find symbol
symbol: class ComputerPlayerInterface
public class TestPlayer implements ComputerPlayerInterface {
^
1 error

---

Now this is a problem, it should compile fine.. it compiles absolutely fine when i execute the normal javac command in the cmd window. but this doesnt seem to work on the web jsp. the ComputerPlayerInterface,java is also in the same directory so i dont know why it throws that error

This is TestPlayer.java

Code:

---

import java.io.*;

public class TestPlayer implements ComputerPlayerInterface {

    public String test() {
        return "Tom";
    }
}

---

This is ComputerPlayerInterface.java

Code:

---

public interface ComputerPlayerInterface {
   
    // Method signatures, which all submitted computer players must have.
    String test();
}

---

Both files are in this folder;
C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\eg\submissions\msk9

i dont know why the runtime code doesnt compile on the web

I'm not a JSP expert but I think you need to add the import tag to your code

Yes ive got this at the top of the jsp

Code:

---

<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.util.*,java.io.*,java.sql.*,java.io.File" %>

---

it just doesnt compile the file over the web. any other way it compiles fine.

if i remove the 'implemets ComputerPlayerInterface' from the TestPlayer.java then it compiles fine over the web...

try moving ComputerPlayerInterface to a package then import it in your jsp file

Ok i now did the package stuff, ComputerPlayerInterface.java is in a folder called ACS

Code:

---

package ACS;

public interface ComputerPlayerInterface {
   
    // Method signatures, which all submitted computer players must have.
    String test();
}

---

now on my test.jsp page: I did the necessary import

Code:

---

<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.util.*,java.io.*,java.sql.*,java.io.File,ACS.ComputerPlayerInterface.*;" %>
 
 <%               
                        // Attempt to automatically compile a file.
                        String s = null;
                        String dir = "C:\\Program Files\\Apache Software Foundation\\Tomcat 6.0\\webapps\\eg\\submissions\\msk9\\";
                        String f = dir + "TestPlayer.java";
                       
                        try {
                                Process p = Runtime.getRuntime().exec("javac -classpath \"ComputerPlayerInterface\" \"" + f + "\"");
                               
                                BufferedReader stdError = new BufferedReader(new InputStreamReader(p.getErrorStream()));
                               
                                ArrayList array = new ArrayList();
                               
                    while ((s = stdError.readLine()) != null) {
                        array.add(s);
                          }
                               
                                if (array.size() > 0) {
                                        out.println("Your submission had compilation errors:<br><br>");
                                       
                                        for (int i = 0; i < array.size(); i++) {
                                                out.println(array.get(i) + "<br>");
                                        }
                                }
                                else {
                                        out.println("Your submission successfully compiled and has been accepted by the system.");
                                }
                               
                        }
                        catch (IOException e) { }
%>

---

when i open the page i still have the same problem, it doesnt seem to compile:

Quote:

---

Your submission had compilation errors:

C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\eg\submissions\msk9\TestPlayer.java:3: cannot find symbol
symbol: class ComputerPlayerInterface
public class TestPlayer implements ComputerPlayerInterface {
^
1 error

---

it just can't seem to find the ComputerPlayerInterface for some reason

Code:

---

package myPackage;

public interface ComputerPlayerInterface {
 // Method signatures, which all submitted computer players must have.
 String test();
}

---

dude, that's java 101

tried the package stuff, didnt work. im trying to navigate to the directory first then doing the javac command:

Code:

---

<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.util.*,java.io.*,java.sql.*,java.io.File" %>
 
 <%               
                        // Attempt to automatically compile a file.
                        String s = null;
                        String dir = "C:\\Program Files\\Apache Software Foundation\\Tomcat 6.0\\webapps\\eg\\submissions\\msk9";
                       
                        try {
                                Process p = Runtime.getRuntime().exec("cd \"" + dir + "\" : javac \"TestPlayer.java\"");
                               
                                BufferedReader stdError = new BufferedReader(new InputStreamReader(p.getErrorStream()));
                               
                                ArrayList array = new ArrayList();
                               
                    while ((s = stdError.readLine()) != null) {
                        array.add(s);
                          }
                               
                                if (array.size() > 0) {
                                        out.println("Your submission had compilation errors:<br><br>");
                                       
                                        for (int i = 0; i < array.size(); i++) {
                                                out.println(array.get(i) + "<br>");
                                        }
                                }
                                else {
                                        out.println("Your submission successfully compiled and has been accepted by the system.");
                                }
                               
                        }
                        catch (Exception e) { out.println(e.toString()); }
%>

---

but its giving me an exception error

java.io.IOException: CreateProcess: cd "C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\eg\submissions\msk9" : javac "TestPlayer.java" error=2

even when i put this in my cmd window:

cd "C:\Program Files\Apache Software Foundation\
Tomcat 6.0\webapps\eg\submissions\msk9" : javac "TestPlayer.java"

The system cannot find the path specified.

Java is a programming language not a shell script

i found a way to execute 2 commands in 1 go via the &&. e.g:

cd "C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\eg\submiss
ions\msk9" && javac "TestPlayer.java"

that works when i typed it in my cmd window.

but my code below in my jsp file:

Code:

---

<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.util.*,java.io.*,java.sql.*,java.io.File" %>
 
 <%               
                        // Attempt to automatically compile a file.
                        String s = null;
                        String dir = "C:\\Program Files\\Apache Software Foundation\\Tomcat 6.0\\webapps\\eg\\submissions\\msk9";
                       
                        try {
                                Process p = Runtime.getRuntime().exec("cd \"" + dir + "\" && javac \"TestPlayer.java\"");
                               
                                BufferedReader stdError = new BufferedReader(new InputStreamReader(p.getErrorStream()));
                               
                                ArrayList array = new ArrayList();
                               
                    while ((s = stdError.readLine()) != null) {
                        array.add(s);
                          }
                               
                                if (array.size() > 0) {
                                        out.println("Your submission had compilation errors:<br><br>");
                                       
                                        for (int i = 0; i < array.size(); i++) {
                                                out.println(array.get(i) + "<br>");
                                        }
                                }
                                else {
                                        out.println("Your submission successfully compiled and has been accepted by the system.");
                                }
                               
                        }
                        catch (Exception e) { out.println(e.toString()); }
%>

---

when i run the jsp file in my browser, it gives me an error:

java.io.IOException: CreateProcess: cd "C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\eg\submissions\msk9" && javac "TestPlayer.java" error=2