CODEWITHSUNDEEP
javaversion
Skeith
Skeith

Reputation: 2542

Can I specify what version of Java to run my program on

I have an old program that runs on JRE 1.6, when you upgrade beyond that the program will not log in.

I've looked into upgrading it but cant seem to make it compatible with later JRE versions. Problem is customers keep upgrading the JRE on the machine it runs on, even when told not to.

Is it possible to install 2 JRE on a machine and specify which one to use when running my program?

I was thinking if the class path points to JRE 1.8 but i didn't use the classpath but the full address of the JRE 1.6, would that work ?

Edit:

java -Djava.library.path=lib/ -classpath .;lib/Serialio.jar;lib/log4j.jar;lib/client.jar -Djava.security.policy=java.policy 192.168.0.10 1098

this is my bat file, i've tried replacing -classpath with C:\jre1.5/bin/java.exe -jar but it thinks thats the name of my main class not the new class path, what am i doing wrong

Upvotes: 4

Views: 5857

Answers (1)

Jordi Castilla
Jordi Castilla

Reputation: 26961

Is it possible to install 2 JRE on a machine and specify which one to use when running my program?

YES, if you execute the jar, you can run it from an specific JRE

path_to_jre/bin/java.exe -jar YourApp.jar

Simply put the above line in a .bat file for your customers and double click will execute the program with defined java version, allowing your customers to upgrade java for other apps without problem.

java -Djava.library.path=lib/ -classpath .;lib/Serialio.jar;lib/log4j.jar;lib/client.jar -Djava.security.policy=java.policy 192.168.0.10 1098 is my bat file, i've tried replacing -classpath with path_to_jre/bin/java.exe -jar it thinks thats the name of my main class not the new class path, what am i doing wrong

your bat file must be something similar to this (path to java is my own one):

C:\Program Files\Java\jre6\bin\java 
       -Djava.library.path=lib/ 
       -classpath .;lib/Serialio.jar;lib/log4j.jar;lib/client.jar 
       -Djava.security.policy=java.policy 192.168.0.10 1098

Upvotes: 3

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