Compile .java file on JSP

[Charles Philip]

Hi!

I have a JSP page which generates a java file. This java file contains the code for an applet. I have been using java to compile the .java file itself by this code:

import com.sun.tools.javac.Main;
import java.io.IOException; 
public class compFile {
	public static final void main(String [] args)
	{
	String javacArguments[] = new String[1];
	javacArguments[0] = "SimApplet.java";

	com.sun.tools.javac.Main.compile(javacArguments);
	}
}

But now I would like to compile my .java file through my JSP page itself. I tried to import tools and use javac but it did not work...

Thanks!

[Jeanne Boyarsky]

Charles,
Welcome to CodeRanch!

I don't follow your question. It sounds like you are asking how you would stick the code you already have in a JSP. (Which would be poor practice, but the answer would be copy/paste.) I think you are asking something else though.

Also, note I added code tags to your post to make it easier to read.

[Charles Philip]

Thanks for your reply,

The server generates an applet code which does not do the same thing each time. This means that my .java file(which contains the applet) is different each time. How to compile this file on the server? I tried this code below but it did not work even though I imported what was needed. I get an error saying that it could not compile.

[William Brogden]

I get an error saying that it could not compile.

Where did you see the error message and exactly what did it say.

Bill

[Charles Philip]

I put tools.jar in my build path in order to use javac and the error(HTTP Status 500) is:


org.apache.jasper.JasperException: Unable to compile class for JSP:

An error occurred at line: 468 in the jsp file: /CodeGenerator.jsp
com.sun.tools.javac.Main cannot be resolved to a type
465:
466: String javacArguments[] = new String[1];
467: javacArguments[0] = "SimApplet.java";
468: com.sun.tools.javac.Main.compile(javacArguments);

Stacktrace:
org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:92)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330)
org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:439)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:349)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:327)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:314)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:592)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

Charles

[prem pillai]

com.sun.tools package is not standardized and is meant for internal usage only.

What version of java are you using ? If you are using Java 6 , have a look at the new compiler api.

http://download.oracle.com/javase/6/docs/api/javax/tools/package-summary.html

[Charles Philip]

I tried the codes in the link but it did not work. I wrote a .bat file and it solved my problem.

Thanks anyway!