Once upon a time I used a simple (read: naive) workaround of copying all the
sources with token replace "@Override" -> "", then compiling against Java 1.5
(to avoid potential class library linking problems). This was integrated in the
project's ANT build process, was quite ugly, but did the job.
Dawid
Otis Gospodnetic wrote:
Yes, I'd think javac from 1.6 could use 1.6 source and compile to 1.5, but
that's not what I'm seeing:
$ java -version
java version "1.5.0_17"
$ rm jdk
$ ln -s jdk1.6.0_07 jdk
$ java -version
java version "1.6.0_07"
$ ffxg 1.6
./pom.xml: <source>1.6</source>
./taste-web/pom.xml: <source>1.6</source>
./core/pom.xml: <source>1.6</source>
./examples/pom.xml: <source>1.6</source>
$ ffxg 1.5 | egrep 'source|target'
./pom.xml: <target>1.5</target>
./taste-web/pom.xml: <target>1.5</target>
./core/pom.xml: <target>1.5</target>
./examples/pom.xml: <target>1.5</target>
$ mvn -Dmaven.compiler.target=1.5 clean compile
...
[INFO] Compiling 240 source files to
/home/otis/workspace/asf-mahout/core/target/classes
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Compilation failure
Failure executing javac, but could not parse the error:
javac: source release 1.6 requires target release 1.6
It's very possible I'm not doing something correctly. I've been lucky never to
have had to deal with this stuff before.
Otis
--
Sematext -- http://sematext.com/ -- Lucene - Solr - Nutch
----- Original Message ----
From: Sean Owen <sro...@gmail.com>
To: mahout-dev@lucene.apache.org
Sent: Wednesday, March 11, 2009 12:05:52 PM
Subject: Re: Mahout for 1.5 JVM
Nah, source must certainly be 1.6 since the code requires 1.6. This means
you need Java 6, not 1.5, to compile. It is only target that can and must be
1.5.
But you will not be able to compile all of Mahout because there is, at
least, use of Deque. Taste should be OK but there is no separate target for
it. Hence roll a quick build.xml or add this to Maven. I could easily send
you such a thing.
(PS there are definitely Taste/Mahout bindings but that does not pose a
problem for you.)
On Mar 11, 2009 3:57 PM, "Otis Gospodnetic"
wrote:
Still no luck here, though I'm closer. It looks like I'm hitting the same
thing Jeff and Deneche hit 2 months ago.
I installed JDK 1.5
I double-checked javac - 1.5
I then tried compiling:
mvn -Dmaven.compiler.target=1.5 clean compile jar:jar
Didn't work, source being 1.6 is still a problem - makes sense, 1.5 compiler
knows nothing about 1.6. Tried overriding like this:
mvn -Dmaven.compiler.source=1.5 -Dmaven.compiler.target=1.5 clean compile
jar:jar
This still doesn't work. I thought the above sys properties would override
source and target values in pom.xml's, but apparently they don't. I had to
s/1.6/1.5/g in all pom.xml's. Now I no longer get javac complaining about
bad target or source, but I do hit the actual 1.6 vs. 1.5 issues. :)
I think I'm hitting this problem:
http://markmail.org/thread/n6vvgrtgczkigx7d
Requiring 1.6 makes sense for most of Mahout because Hadoop requires it
anyway. But Taste doesn't run on Hadoop yet (I'm running it completely
Hadoop-free), so it's a shame not to be able to compile at least Taste
with/for 1.5. Should we try fixing that for 0.1 either by
removing/commenting out problematic @Override's or by... hm, there is no
other way, ha? And then making it possible to somehow build only Taste, or
perhaps building Taste with maven is already doable somehow?
Thanks, Otis -- Sematext -- http://sematext.com/ -- Lucene - Solr - Nutch
----- Original Message ---- > From: Sean Owen > To:
mahout-dev@lucene.apache.org
Sent: Monday, March 9, 2009 5:15:09 PM > Subject: Re: Mahout for 1.5 JVM >
You need to compile ...
On Mon, Mar 9, 2009 at 9:04 PM, Grant Ingersoll wrote: > > Mahout requires
1.6 due to Hadoop requi...
