Comments on: Differences between Java compilers

By: Saua

Saua — Mon, 10 Mar 2008 13:47:31 +0000

An ugly “solution” that compiles in both Eclipse and javac is using two casts:

classes.addAll((Collection) (Collection) compCheck.getClasses());

This first discards all generic information and then casts to the desired “generified” Collection. Ugly, but at least it compiles in javac.

By: tompson

tompson — Thu, 10 Jan 2008 20:13:07 +0000

As Daniel said I have no workaround too. The thing I do is to change my code so that javac is able to deal with it. It should be possible to use the Eclipse compiler inside an ant build but I never tried that.

By: Daniel Spiewak

Daniel Spiewak — Thu, 10 Jan 2008 14:27:07 +0000

No real workaround. The only thing to be done would be to open a bug against javac and hope they fix it eventually.

Actually the Eclipse compiler works great when parsed out from the main IDE. Tomcat actually uses it to compile JSPs and such because it’s faster and more incremental than javac.

By: Alaeddin

Alaeddin — Thu, 10 Jan 2008 11:39:09 +0000

is there any workaround suggested other than changing the code? is it a bad idea to think of using eclipse compiler from ant file (i.e. command line like javac)

Thank you

By: tompson

tompson — Fri, 04 Jan 2008 09:26:11 +0000

Thanks for that information Daniel! I too thought that this is an Eclipse bug but reading the bug entry I am pretty sure this is a bug in javac – anyone should file a bug!

By: Daniel Spiewak

Daniel Spiewak — Thu, 03 Jan 2008 19:53:50 +0000

It’s actually Sun’s fault. I ran into this problem a while back and opened a bug against Eclipse first (after all, suspect the third party). Upon verification, it seems that Eclipse is following the spec more closely than javac does. https://bugs.eclipse.org/bugs/show_bug.cgi?id=205195

I never got around to putting this in the JDK bug parade, but at least it’s nice to know who’s to blame.

By: Tonny Madsen

Tonny Madsen — Thu, 03 Jan 2008 19:35:29 +0000

Have anybody found who is to blame here? It would be nice to know…

By: narup

narup — Thu, 03 Jan 2008 18:25:25 +0000

Ya it’s just the compiler issue and nothing to do with generics, i also had similar issue.

By: tompson

tompson — Fri, 28 Dec 2007 17:20:47 +0000

You already sent me this link, very useful site. But this problem has nothing to do with generics themself it seems like this is just a compiler problem.

By: Martin

Martin — Thu, 27 Dec 2007 17:35:10 +0000

Read this FAQ http://www.angelikalanger.com/GenericsFAQ/JavaGenericsFAQ.html. I have once listen to one of Angelikas presentations during a Java conference where she referenced to this site. It has helped me a couple of times to understand generics in depth. However I haven’t checked your specific problem to see if it would answer it