ANN: Java Project Environment, a simple way to manage multiple projects

[jeff <je...@socialchange.net.au>]

This may be of interest to other *nix Java developers..

http://newgate.socialchange.net.au/~jeff/jpe/

Here is a summary, from the docs:

 "[The JPE is] a simple system for working on multiple Java projects
 under GNU/Linux, in particular for managing project classpaths.
 ..
 One of the most painful aspects of Java programming, particularly for
 new programmers, is dealing with classpaths. Every project requires a
 set of jars, which must be listed in the $CLASSPATH variable before the
 project compiles or runs. Of course, every project requires a different
 set of jars. Since there is only one classpath, fixing it is a frequent
 chore.
 ..
 A solution: nested shell-based environments

 The idea (and I'm sure it's pretty old..) is to start a new shell,
 inside your current one, when you start working on a project. The
 Subshell" can be customized in project-specific ways. Specifically,
 the $CLASSPATH variable is automatically populated with jars from
 certain directories (eg lib/), and directories containing classes (eg
 src/java/).
 ..
 Here's what happens when one enters the project subshell:

   jeff@expresso:~$ cd myproj/
   jeff@expresso:~/myproj$ proj.sh 
   -------------------------------------------------------------
    Java Project Environment: version 1.24, 2001/06/28 12:46:49
   -------------------------------------------------------------
   Proj name:              My wonderful new project
   Proj alias:             myproj
   Proj author:            Jeff Turner
   Proj description:
   
   This fictitious project exists solely to illustrate the JPE
   
   -------------------------------------------------------------
   Adding directories to classpath
           Adding /home/jeff/myproj/src
           Adding /home/jeff/myproj/src/java
   Loading jars from /home/jeff/myproj/lib
           Adding /home/jeff/myproj/lib/jaxp.jar
           Adding /home/jeff/myproj/lib/xalan.jar
           Adding /home/jeff/myproj/lib/xerces.jar
   Setting cdc alias to src/java/org/myco/myproj
   
   [jeff@expresso myproj ~]$ 
  
 ..
 ..
 When you start a project subshell:

    * The $HOME variable is reset to point to the project root.
    * The prompt ($PS1) is customized to include the project name.
    * jars from various predefined and user-specified directories are added to
      the classpath.
    * predefined and user-specified directories are added to the classpath (if
      present).
    * Project aliases are set up.



Hope someone finds it useful. I tend to jump between a lot of projects,
and it's has saved me quite a lot of time.


--Jeff

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Re: ANN: Java Project Environment, a simple way to manage multiple projects

[Jeff Turner <je...@socialchange.net.au>]

On Mon, Jul 02, 2001 at 10:11:28AM -0700, Jon Stevens wrote:
> on 7/2/01 4:54 PM, "jeff" <je...@socialchange.net.au> wrote:
> 
> > Hope someone finds it useful. I tend to jump between a lot of projects,
> > and it's has saved me quite a lot of time.
> > 
> > --Jeff
> 
> I'm confused. Why not just use Ant to manage your classpath?

Primarily because invoking Ant every time I want to recompile one file
is too slow. Jikes takes milliseconds; Ant takes seconds.

The secondary reason is because often I want to prototype something, and
don't have an Ant build.xml file set up.

Hopefully this will change when Peter Donald's Ant 2, with incremental
builds, takes over the world. For now, using this in conjunction with
Ant gives you the best of both worlds.

--Jeff


> I haven't set a real $CLASSPATH in about 2 years.
> 
> [152][ ~ ]% echo $CLASSPATH
> .
> 
> -jon
> 
> 
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Re: ANN: Java Project Environment, a simple way to manage multiple projects

[Jon Stevens <jo...@latchkey.com>]

on 7/2/01 4:54 PM, "jeff" <je...@socialchange.net.au> wrote:

> Hope someone finds it useful. I tend to jump between a lot of projects,
> and it's has saved me quite a lot of time.
> 
> --Jeff

I'm confused. Why not just use Ant to manage your classpath?

I haven't set a real $CLASSPATH in about 2 years.

[152][ ~ ]% echo $CLASSPATH
.

-jon


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