Comments on: Invoke Javac At Runtime

By: Umesh

Umesh — Mon, 19 Dec 2011 12:24:59 +0000

How to set classpath ?
I am not able to access source files using classpath.

I get following message :
javac: file not found: User.java
Usage: javac
use -help for a list of possible options

I have written code like this :
String[] options = new String[] {“-classpath”, “D:/My Documents/”, “-d”, “D:/My Documents/classes”, “User.java”};

By: konichiwa

konichiwa — Sat, 27 Sep 2008 07:57:51 +0000

why, oh WHY isn’t javac included in the JRE (and tool.jar et. al.) so that dynamic code generation could be assumed on a user’s machine? there are just some things that are much harder if not impossible to do without the ability to generate code at runtime … arrrgh. !$##!$!$*!!

By: mohan

mohan — Mon, 04 Jun 2007 20:11:55 +0000

Hi All,

PLEASE SUGGEST ME SOME TIPS….!

I have been trying since 3 days to solve this problem…every thing is fine with tools .jar, web.xml and every thing even classpath also

please kindly help me to solve this ….

HTTP Status 500 -

——————————————————————————–

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: java.lang.NoClassDefFoundError: sun/tools/javac/Main
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:481)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
com.auth.servlets.Controller.doPost(Controller.java:330)
com.auth.servlets.Controller.doGet(Controller.java:58)
javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

root cause

java.lang.NoClassDefFoundError: sun/tools/javac/Main
org.apache.jasper.compiler.SunJavaCompiler.compile(SunJavaCompiler.java:136)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:272)
org.apache.jasper.servlet.JspServlet.loadJSP(JspServlet.java:548)
org.apache.jasper.servlet.JspServlet$JspServletWrapper.loadIfNecessary(JspServlet.java:176)
org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:188)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:381)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:473)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
com.auth.servlets.Controller.doPost(Controller.java:330)
com.auth.servlets.Controller.doGet(Controller.java:58)
javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.13 logs.

——————————————————————————–

Apache Tomcat/6.0.13

By: Felipe Ortiz's Blog

Felipe Ortiz's Blog — Mon, 30 Apr 2007 01:44:15 +0000

Top Java SE 6 Features…

Now that I have had some time to work with Java SE 6, I thought I share a list what I think are the top five features….

By: Frederick

Frederick — Wed, 28 Mar 2007 00:33:09 +0000

how do print out the errors received after programmatically compiling?

By: TechKnow

TechKnow — Tue, 20 Mar 2007 21:04:31 +0000

@Soham – AFAIK you need the qualified class name to load the class via the ClassLoader.

To you second question, try using the com.sun.tools.javadoc.Main class to invoke JavaDoc from your own code/classes in a similar manner which I described here.

By: Soham Sengupta

Soham Sengupta — Tue, 20 Mar 2007 10:48:10 +0000

Can I access reflection Information about a Java Class whose qualified name has not been given?
Please do let me know at your earliest.
I searched the web but in vain
By the way your article very much helped me, but I want the Java DOCs of this tools.jar API.
How to get it?