org.backsource.utils.lang
Class Main

java.lang.Object
  org.backsource.utils.lang.Main

public class Main

extends java.lang.Object

A dynamic main to use instead of the normal main i jar-files to be able to load classes from jar-files inside the jarfile run by java -jar.

main makes it possible to package applications in a jar-file and run the with the java -jar XXX.jar command. This class works like a standin for the main you want to run. by specifying this class as the Main-class in the manifest it is possible to distribute lib:s the applications depends on as embedded jarfiles.

Main will add all jar-files mentioned in the Class-path attribute to the classpath without them having to exist outside the running jar-application. It will the start the main application specifyed in the Dynamic-main attribute. A normal manifest could look like this:

Main-class: org.backsource.utils.lang.Main
Class-path: lib/xerces2.0.2.jar lib/xalan2.4.D1.jar lib/xml-apis.jar lib/timutils.jar

Name: se/tim/utils/lang/Main.class
Dynamic-Main: org.backsource.utils.javadoc.XMLEscaper

The libraries would be embedded in the distributed jar-file, which could look like this:

[pra@pra jars]$ unzip -l xmlescaper.jar
Archive:  xmlescaper.jar
  Length     Date   Time    Name
 --------    ----   ----    ----
        0  09-09-02 11:58   META-INF/
      264  09-09-02 11:58   META-INF/MANIFEST.MF
        0  08-19-02 13:28   se/
        0  05-21-02 12:41   se/tim/
        0  08-22-02 12:58   se/tim/utils/
        0  08-23-02 16:53   se/tim/utils/lang/
     4544  09-09-02 11:57   se/tim/utils/lang/Main.class
      987  09-09-02 11:57   se/tim/utils/lang/Main$MainClassLoader.class
     3174  09-09-02 11:57   se/tim/utils/lang/Main$Handler.class
        0  09-09-02 11:58   lib/
   108484  08-22-02 13:16   lib/xml-apis.jar
   933730  08-22-02 12:59   lib/xerces2.0.2.jar
   983377  08-22-02 12:59   lib/xalan2.4.D1.jar
    58971  09-03-02 10:00   lib/timutils.jar
 --------                   -------
  2093531                   14 files

} // end of main () } // end of main ()

Version:

$Revision: 1.1.1.1 $

Author:

Peter Antman

Nested Class Summary

class	Main.Handler
class	Main.MainClassLoader

Field Summary

static boolean	debug
static java.util.jar.Attributes.Name	DYNAMIC_MAIN

Constructor Summary

Main()

Method Summary

void	invokeClass(java.lang.String[] args)
static void	main(java.lang.String[] args)
void	pwd()
void	setClasspath(java.lang.String jarfile, java.lang.String manifestcl)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DYNAMIC_MAIN

public static final java.util.jar.Attributes.Name DYNAMIC_MAIN

debug

public static final boolean debug

See Also:

Constant Field Values

Constructor Detail

Main

public Main()
     throws java.lang.Exception

Method Detail

setClasspath

public void setClasspath(java.lang.String jarfile,
                         java.lang.String manifestcl)
                  throws java.net.MalformedURLException,
                         java.io.IOException

Throws:

java.net.MalformedURLException

java.io.IOException

invokeClass

public void invokeClass(java.lang.String[] args)
                 throws java.lang.ClassNotFoundException,
                        java.lang.NoSuchMethodException,
                        java.lang.reflect.InvocationTargetException,
                        java.io.IOException

Throws:

java.lang.ClassNotFoundException

java.lang.NoSuchMethodException

java.lang.reflect.InvocationTargetException

java.io.IOException

pwd

public void pwd()
         throws java.lang.Exception

Throws:

java.lang.Exception

main

public static void main(java.lang.String[] args)
                 throws java.lang.Exception

Throws:

java.lang.Exception