Java JRE and backwards compatibility

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?
jdwarrenAsked:
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CEHJCommented:
>>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
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CEHJCommented:
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
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Tommy BraasCommented:
>> 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).
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jdwarrenAuthor Commented:
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?
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sciuriwareCommented:
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!
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CEHJCommented:
8-)
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