[ltp] Java pre-1.5 and post 1.5

[Peter B. West]

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Bret Comstock Waldow wrote:
> On Fri, 30 Dec 2005 23:27, Peter B. West wrote:
> 
> 
>>I can't recall the details, to tell you the truth.  But I was strongly
>>advised to keep the system JVM as 1.4.2 and to set only my user as 1.5.
>>The problem is something to do with updates for many Java-based packages
>>being unable to compile with 1.5.
> 
> 
> Ah, yes.  Sun changed the language.  They introduced some new keywords and 
> some new paradigms.
> 
> In some cases, people had been 'faking' similar functionality (the consistent 
> demand for which contributed to Sun deciding to put it in the language), and 
> so there are possible collisions between the new keywords and those same 
> names used as user defined objects previously.
> 
> So, code written pre-1.5 might contain constructs that mean something else 
> with 1.5.  There are flags to tell 1.5 to take this into account, but the 
> language is changing, and so there is a transittion period.
> 
> 
> The system user is the environment that recompiles any java packages (along 
> with all the other pacckages) during 'emerge' operations - hence the 
> suggestion to keep a 1.4 environment for the system user - so legacy code 
> will compile cleanly.  The actual users don't do that, and may arrange their 
> environment to their liking and deal with the consequences themselves.
> 

I am the actual user, _and_ it's my system.  I'm not running in a 
multi-user environment.

> 
> 
>>I have no reason to maintain a 1.4.2 installation.
> 
> 
> But of course.  As you point out, there is no need to.
> 

No.  Unless I'm running Gentoo.

> 
> 
>>If anyone has a reason or desire to maintain dual environments, good
>>luck to them.  I don't, and I don't see why I should be obliged to.
> 
> 
> Only for the sake of 'emerge -e' with legacy packages that weren't psychic 
> enough to anticipate the changes Sun would make in 1.5...
> 

Yes.  In other words, unless I'm running Gentoo.

> Cheers,
> Bret

If you want to see just how arcane the Java environment is becoming at 
Gentoo, go to the gentoo-java archives, and look at the thread 'Java 1.5 
migration plans'.  It'll put hairs on your chest.

Peter
-- 
Peter B. West <http://cv.pbw.id.au/>
Folio <http://defoe.sourceforge.net/folio/>

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