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Migration from 32 to 64 jvm and Java Application impact

 
John Nicer
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Hi SME,
Our organization needs to move from JVM 32  - JVM 64. I don't know how much impact on existing application.  I did a lot of research but have not found anything so far.
We need to move on JVM 32 -64,
Java 6 to Java 7
WAS 8 to 9.

But first immediate need is the JVM 6  - 7.  I wonder if anyone of you have done this which guess you have.  Please share with me your experience of the impact.  I appreciate a lot.  Thank you very much.

John
 
Campbell Ritchie
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You need not expect to see any difference between 32‑bit and 64‑bit architectures. But why are you moving to Java7 rather than Java8? Java6 has been beyond end of life for nearly four years.
 
Jesper de Jong
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Not only Java 6, also Java 7 has reached its end of life according to Oracle; Oracle has not provided any public updates anymore for Java 7 since April 2015, see the Oracle Java SE Support Roadmap. Consider upgrading to Java 8 instead of Java 7, because Java 8 is the current and supported version of Java.

Java programs are independent of whether they run on a 32-bit or 64-bit platform; there are no common things you need to change if you go from 32-bit to 64-bit Java, it's not even necessary to recompile your source code, your existing applications should just run without any modification.

Oracle is extremely careful to make sure that newer Java versions are compatible with older versions. You should be able to run your applications built using Java 6 on Java 7 or 8 without any problems. It is, however, possible that there are minor things you have to take into account when upgrading to a newer Java version. Oracle has compatibility guides to explain possible incompatibilities:

Java SE 7 and JDK 7 Compatibility
Compatibility Guide for JDK 8
 
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