Compiling and running jsp-code on the fly.

I am intending to use jsp as a report engine. The 'templates' should be jsp-code stored in the db, loaded and executed as if they where inside a plain jsp-file in the application. I cannot write new files on the file system since this is prohibited on the production env - so I would like to compile and execute the jsp-code directly in memory.
Was hoping this could be done with the jee standard stack.
Does anybode know how to to this, if possible?

If you just want to run java applications, you just need the JRE: J2SE 5.0 JRE
If you want to compile java source code, you need the JDK: J2SE 5.0 JDK
It includes also the JRE. Recommended is also the J2SE 5.0 Documentation that contains the javadoc API that describes all the Java classes.
To start develeoping I recommend the Java Tutorial: http://java.sun.com/docs/books/tutorial/

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I am new to JSP technology. We are thinking to modify some of JSP code to meet our need. But I am not sure what I should do after I change JSP code. How can I compile the changed code? How to deploy? How to publish on the web?

All files are regenerated if changed.
That goes for the .java and the .class files that are created. The jsp server checks to see if the current version is the latest. If it is, nothing gets changed or recompiled. If things are different, programs are recompiled.
Youll notice that if you have a new jsp it always takes longer the first time. Or even when you change a jsp, the first time takes the longest for the page to come up in a browser. This is because of recompiling.
Does this make any sense?
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Hi All,
I'm beginner in Javacard. I just installed javacard dev kit. I have followed the instruction to set up javacard environment (install javacard, install ant, set path)I
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Edited by: kicklee on Aug 16, 2008 4:20 PM

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hi,
i need of a jsp page that has a textarea in which the java coding are entered and this coding is compiled and executed. The execution result is printed.
Please guide me.

I don't think you can invoke java compiler or run time environment at client side (browser). Even if you use applet, i think you will not be able to do it at client side. Moreover, though java virtual machine will be available in your target user's browser, but you should not expect a java compiler in users machine.
I have seen exam sites where they have added java code compilation and execution ability. To achieve this you can do:
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3. On click of 'Compile' send the code to server side. In server machine create a file in a temporary location in disk and save the code content received from client.
4. Invoke 'javac' command (as a separate process) to compile the java class created in step 3. This process will give you error/output back which you can send back to user.
5. In case of 'Run' you must first invoke above mentioned 'Compile' service and then another service ('Run') to actually run you java class. You can build 'Run' service in similar way.
Here you challenge would be managing multiple client requests (to compile and run java class) at the same time.
Code to compile and run java classes:
import java.io.*;
* A class to compile and run java classes.
* @author Mrityunjoy Saha
public class JavaProcessor{
     public static void main(String[] args){
          // Option 1 to compile and option 2 to run.
          int option=1;
          if(args.length > 0){
               option=Integer.parseInt(args[0]);
          JavaProcessor p=new JavaProcessor();
          if(option==1){
               p.compile();
          } else {
               p.run();
     public void run(){
          String file="FoodTest";
          String directory="C:/Users/mrityunjoy_saha/Documents/Test";
          executeCommand("java", directory, file);
     public void compile(){
          String file="FoodTest.java";
          String directory="C:/Users/mrityunjoy_saha/Documents/Test";
          executeCommand("javac", directory, file);
     public void executeCommand(String command, String directory, String file){
          try{
               String[] envp=null;
               // Make sure that you have done Java setup in your machine.
               // To test this try invoking javac command in command prompt.
               Process p=Runtime.getRuntime().exec(command+" "+file,envp,new File(directory));
               BufferedReader errorStream=new BufferedReader(new InputStreamReader(p.getErrorStream()));
               String readData="";
               while((readData=errorStream.readLine())!=null){
                    System.out.println(readData);
               BufferedReader outStream=new BufferedReader(new InputStreamReader(p.getInputStream()));
               readData="";
               while((readData=outStream.readLine())!=null){
                    System.out.println(readData);
          catch(IOException ioe){
               ioe.printStackTrace();
}Thanks,
Mrityunjoy

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Hello,
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http://developers.sun.com/techtopics/mobility/midp/articles/palm
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thanks

To set the PATH permanently, add the full path of the jdk1.6.0_<version>\bin directory to the PATH variable. Typically this full path looks something like C:\Program Files\Java\jdk1.6.0_<version>\bin. Set the PATH as follows on Microsoft Windows:
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Thanks in Advance ,
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I've given my pgm and the thing I've got when I compiled it.
Test.java
package com.cert;
public class Test
public void display()
System.out.println("Hai");
F:\Tomcat5\webapps\Ambika\WEB-INF\Classes>javac -d F:\Tomcat5\webapps\Ambika\WEB-INF\Classes\Test.java
javac: no source files
Usage: javac <options> <source files>
where possible options include:
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-g:none Generate no debugging info
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-deprecation Output source locations where deprecated APIs are u
sed
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-cp <path> Specify where to find user class files
-sourcepath <path> Specify where to find input source files
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-d <directory> Specify where to place generated class files
-encoding <encoding> Specify character encoding used by source files
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Dear Friends:
I believe I encountered a very difficult situation when I try to run Fortran
files in Sun Sparc Solaris 8.0.
I would like to describe it, hopefully someone can give me some suggestions.
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machine, later on there are Linux and Unix adaptions (but not for Sun
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Justin,
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unix:
f77 -w -O -static *.f -o $(EXE)
becomes
unix:
f90 -f77 -w -O *.f -o $(EXE)
I noticed during the compilation that there were a number of BLAS and LAPACK routines that are being compiled into the application. The Sun Studio compilers include a high performance BLAS/LAPACK library called the Sun Performance Library which provides highly tuned versions of the BLAS/LAPACK routines called by this application. I would be more than happy to help you modify the source and makefile so that you can use these tuned routines and realize increased performance in this application.
I ran several of the data sets in the examples directory and they appeared to complete successfully. Since none of them run for more than a second or so, it's hard to say whether or not the tuned Performance Library will have a large impact on the performance or not.
If you are interested, please contact me : [email protected]

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Hi,
I often encounter many problems when I run java programs in the different directories. Like
javac -d dir_name a.java
java -cp dir_name a
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So I hope to read something about how to compile and run java programs in different directory properly.
Could you pleae give me a detailed description for that or recommend a book or website?
Thanks a lot.

Can you post a small amount of code that does not work, including the directory structure, and the error messages? Some one here can likely explain the problem.

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I have a college matlab code that i want to compile and run and take an output of. Can anyone guide me with this in xcode?
Neerav

Hi,
I already googled it and went through that website before posting here and as you can see the software is paid. And thats exactly why I asked in my original post as to whether there is a way to do it with xcode.
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Neerav Kothari

How should I compile and run my jdbc application ?

I need help about how is the correct way for compile and run my application conecta.java using a driver postgresql-8.3-603.jdbc3.jar for connect to my database under Postgresql 8.1.4, . I have compiled as follow :
javac -cp postgresql-8.3-603.jdbc3.jar conecta.java
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but when I try using :
java conecta
a message display an error :
java.lang.ClassNotFoundException: org.postgresql.Driver
I didn find the cause , I try modifing the classpath onto .bash_profile :
# User specific environment and startup programs
JDK_HOME=/usr/local/jdk1.5.0_01
JAVA_HOME=/usr/local/jdk1.5.0_01
PATH=$JAVA_HOME/bin:/usr/lib/pgsql/bin:$HOME/bin:$PATH:.
CLASSPATH=$JAVA_HOME/lib/postgresql-8.3-603.jdbc.jar:$CLASSPATH.
export PATH CLASSPATH JAVA_HOME JDK_HOME
unset USERNAME
but the message is the same . I have downloaded the driver into the same directory where is sited concecta.class and conecta.java . I don't understand why netbeans works fine runnning my application. I will be glad if anybody help to me.
Thanks

Miguel231152 wrote:
I need help about how is the correct way for compile and run my application conecta.java using a driver postgresql-8.3-603.jdbc3.jar for connect to my database under Postgresql 8.1.4, . I have compiled as follow :
javac -cp postgresql-8.3-603.jdbc3.jar conecta.javaActually, you probably don't need the JAR in the CLASSPATH to compile. You shouldn't refer to PostgreSQL classes in your code, just java.sql interfaces.
and I have compiled with sucessful obtaining conecta.class
but when I try using :
java conectaGotta have the JAR in the CLASSPATH at runtime. That's why you get that exception, and that's always what it means.
a message display an error :
java.lang.ClassNotFoundException: org.postgresql.Driver
I didn find the cause , I try modifing the classpath onto .bash_profile :
# User specific environment and startup programs
JDK_HOME=/usr/local/jdk1.5.0_01
JAVA_HOME=/usr/local/jdk1.5.0_01
PATH=$JAVA_HOME/bin:/usr/lib/pgsql/bin:$HOME/bin:$PATH:.
CLASSPATH=$JAVA_HOME/lib/postgresql-8.3-603.jdbc.jar:$CLASSPATH.Useless. Java ignores CLASSPATH environment variable.
export PATH CLASSPATH JAVA_HOME JDK_HOME
unset USERNAME
but the message is the same . I have downloaded the driver into the same directory where is sited concecta.class and conecta.java . I don't understand why netbeans works fine runnning my application. I will be glad if anybody help to me.
ThanksUse the -classpath option at runtime. That'll fix it.
%

How do I compile and run Java programs on a Mac?

To clarify my earlier post, I know that you can write java in any text editor but with the PC you compile and run everything through the MS DOS prompt, what is the Mac equivalent?

See this question :-)
http://forum.java.sun.com/thread.jsp?forum=54&thread=289574

It compiles and runs, but scrollPane doesn't work.

Bah. Why doesn't my scrollPane work? It compiles and runs but my scrollbars for the text area are nowhere to be found. This is the code I'm using to handle my scrollpane.
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            scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
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private ImageIcon icon = new ImageIcon("BKLogo.gif");
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You know what you need to do then: post an SSCCE (Short, Self Contained, Correct (Compilable), Example). For info on what this entails, look at these two sites:
http://javafaq.mine.nu/lookup?22
http://www.physci.org/codes/sscce.jsp

Compiling and running jsp-code on the fly.

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