Solved

Java JRE and backwards compatibility

Posted on 2004-03-31
6
594 Views
Last Modified: 2013-11-23
I have been keeping my SDK fairly current on Linux (Sun 1.4.2_03) and the java application being developed is working fine. I know that the SDK comes complete with a jre that can be included if I install the application on other Linux computers.

My question is generic in that if I move my application, being developed with 1.4.2_03,  to other Linux computers that have some other version of the jre (1.3.1 from blackdown.org or Sun for example), should I have a lot to worry about?
0
Comment
Question by:jdwarren
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
6 Comments
 
LVL 86

Expert Comment

by:CEHJ
ID: 10726138
Depends on whether you've used 1.4 specific classes. If you haven't, and recompile with

javac -target 1.3 YourApp.java

you should be OK
0
 
LVL 14

Expert Comment

by:Tommy Braas
ID: 10726238
>> javac -target 1.3 YourApp.java
You don't have to specify the -target option as the default for JDK 1.4 is 1.3 (sic).
0
 

Author Comment

by:jdwarren
ID: 10727357
orangehead911,
If the -target option is already defaulted to 1.3 does that mean that 1.3 and 1.4 basically are the same for javac and therefore there is not much to worry about?
0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 86

Accepted Solution

by:
CEHJ earned 50 total points
ID: 10727444
>>You don't have to specify the -target option as the default for JDK 1.4 is 1.3 (sic).

Won't do any harm. Not the case with some compilers. If i compile with jikes against 1.4 libs without -target 1.3 it trashes 1.3 appletviewer
0
 
LVL 24

Assisted Solution

by:sciuriware
sciuriware earned 75 total points
ID: 10729593
Please distinguish between compiler and virtual machine (JRE):
1.4 added not too much to the notion of the .class files, only some optimisations and a smarter JRE for
higher speed. On the contrary 1.4 added a lot of new classes and techniques you're gonna miss on a 1.3
system.

Be aware that 1.5 will not be compatible on the compiler level: new language elements are added.

When you deliver an application, always add the current JRE and leave it to the customer to
install it or ask for a scaled-down version of the application.

;JOOP!
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 10733452
8-)
0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

Suggested Solutions

Java Flight Recorder and Java Mission Control together create a complete tool chain to continuously collect low level and detailed runtime information enabling after-the-fact incident analysis. Java Flight Recorder is a profiling and event collectio…
In this post we will learn how to connect and configure Android Device (Smartphone etc.) with Android Studio. After that we will run a simple Hello World Program.
Viewers will learn one way to get user input in Java. Introduce the Scanner object: Declare the variable that stores the user input: An example prompting the user for input: Methods you need to invoke in order to properly get  user input:
This tutorial covers a practical example of lazy loading technique and early loading technique in a Singleton Design Pattern.
Suggested Courses

736 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