Solved

Can you change classpath while the vm is executing?

Posted on 1997-05-12
2
349 Views
Last Modified: 2013-11-23
Hi,

I have C app which uses JNI to bring up a vm to execute some methods.
Before, I brought up the vm, I set the class path in the VM's
initialization arguments and that works fine. But, the vm won't find the
class if you specify a class which is not in the class path. Is there
any way, you can change the class path while the vm is up in memory?

I tried a few ways. But, none seem to work. I first tried by resetting
the VM's init_args. This won't work unless you bring up another VM.
Another thing I tried was by calling putenv("classpath=exst classpath +
new cls path"). I thought this should work. But, it didn't. Does anyone
have comments on this or is there other ways of doing it?

Thanks,
Jamie
0
Comment
Question by:jamwang
2 Comments
 
LVL 6

Expert Comment

by:jpk041897
ID: 1220386
getEnv and putEnv were removed from the VM in jdk 1.01 (the calls are still there, they just don't do anything) and completley removed in 1.1. Apperantly for security reasons, (much to the anoiance of Java CGI writters).

The purpose of this removal was to stop users from doing preciseley what you are attempting, this beeing a posible breach of security.

There is no way that will work for applets. For standalone apps, you could exec() a bat/shell script. that modifies the CLASSPATH variable and the launches the new app in a new shell.

The only marginaly acceptable solution I can think of would be to use packages.
0
 
LVL 2

Accepted Solution

by:
majkl earned 100 total points
ID: 1220387
As jpk alreadfy mentioned. You cannot change CLASSPATH from the applet or application.

0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

After being asked a question last year, I went into one of my moods where I did some research and code just for the fun and learning of it all.  Subsequently, from this journey, I put together this article on "Range Searching Using Visual Basic.NET …
Introduction This article is the last of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article covers our test design approach and then goes through a simple test case example, how …
Viewers will learn about basic arrays, how to declare them, and how to use them. Introduction and definition: Declare an array and cover the syntax of declaring them: Initialize every index in the created array: Example/Features of a basic arr…
Viewers will learn about the regular for loop in Java and how to use it. Definition: Break the for loop down into 3 parts: Syntax when using for loops: Example using a for loop:

937 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

9 Experts available now in Live!

Get 1:1 Help Now