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From: Hans Witvliet <suse@a-domani.nl> To: Greg Freemyer <greg.freemyer@gmail.com> Subject: Re: [opensuse] java / openjdk Date: Sat, 01 Dec 2012 08:38:23 +0100

On Fri, 2012-11-30 at 19:11 -0500, Greg Freemyer wrote:

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On Fri, Nov 30, 2012 at 7:00 PM, Hans Witvliet <suse@a-domani.nl> wrote:

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Hi,

Any java guru's around here?

Perhaps i'm a bit confused about the naming structure...

For one of the projects i'm working for, the manual tels me that openjdk is preferred above (Oracle-)JDK, and that i should use openjdk6.

A couple of weeks ago i saw openjdk6-1.6.0, but when ik look now, all i see is java-1_7_0-openjdk-1.7.0.6-3.16.1.i586 Are these both versions of openjdk6 ?

Should i be able to install/use 1.7.0 instead of 1.6.0 ?? Or are they incompatible?

Hans

I don't know why but:

Java 4 is released as java-1_4 Java 5 is released as java-1_5 Java 6 is released as java-1_6 Java 7 is released as java-1_7

And there can be backward compatibility issues between the versions, so you can always try your Java 6 app in Java 7, but if it doesn't work try it with Java 6 instead.

fyi: When a Java app is built it can specify which JREs it needs to run, so it may just immediately fail and say you need some specific version.

Greg

Thanks Greg,

Supposed something like that. but what me got wondering are some files on the OBS: /srv/distro/repo/Java:/openjdk6:/Factory/openSUSE_11.4/x86_64/java-1_7_0-openjdk-1.7.0.6-55.1.x86_64.rpm /srv/distro/repo/Java:/openjdk6:/Factory/openSUSE_11.4/x86_64/java-1_6_0-openjdk-1.6.0.0_b24.1.11.5-2.1.x86_64.rpm Both reside under "openjdk6", but one is java-1_6_0 and the other is java_1-7_0 !!

So i would expect that the sdk needed for "java 7" would be named openjdk7. but something like that doesn't exist on the OBS.

With regards to the app: they said: to build it, use either oracle JDK (no version specified) or preferably "openjdk6"

for OS_12.2 i seem to have no option but 1_7_0, but ant gives a couple of times: -------------------------------- [javac] WARNING [javac] [javac] The -source switch defaults to 1.7 in JDK 1.7. [javac] If you specify -target 1.6 you now must also specify -source 1.6. [javac] Ant will implicitly add -source 1.6 for you. Please change your build file. [javac] warning: [options] bootstrap class path not set in conjunction with -source 1.6 ------------------------------- This give me the impression (!) that it has a hard dependancy on 1_6_0..

Or, if they are such incompatible, why has java-1_6_0-openjdk-1.6.0 been removed from the OBS for OS_12.2? It is still there for OS_11.4, OS_12,1 and even sles11_sp2.

Hans

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