NB & Eclipse about jar files

[Amn Ojee Uw]

I have recently have done a major shift as a developer, I switch from MS 
to Debian 11 and as they say "New year, new life". So, I've also changed 
my developing platform to NetBeans 12.x from Eclipse. I have realized 
that the jar files produced by Eclipse are not desirable by  NB 12.x.
Is this the norm? Should I always assume that  Eclipse produced jar 
files will not run on NetBeans?

As a personal note, let me say that this issue must not exist; "Write 
once, run anywhere"?

Perhaps, someone here could point out a document on the net that 
addresses this issue.


Thanks in advance.