Re: Java version used by Jpl (Prolog to Java)

On 19/03/2014, at 00:03, Sergio Castro <[email protected]> wrote:

> I have just realized that the Java version used by JPL (Prolog side) is not the one configured by default.
> 
> My installed Java version is 7, as verified with:
> 
> $ java -version
> java version "1.7.0_51"
> Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
> Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)
> 
> Also, the JAVA_HOME environment var is properly set.
> 
> However, if I execute this query in swi:
> 
> ?- jpl_call( class([java,lang],['System']), 'getProperty', ['java.version'], V).
> V = '1.6.0_65'.
> 
> 
> I see that it is using Java 6 instead of 7. How could I fix it so it will use the default java installation ?

I can reproduce the problem with SWI-Prolog 7.1.10. But the strange thing is that in the "packages/jpl/config.log" file I have:

JAR='/Library/Java/JavaVirtualMachines/jdk1.7.0_51.jdk/Contents/Home/bin/jar'
JAVA='/Library/Java/JavaVirtualMachines/jdk1.7.0_51.jdk/Contents/Home/bin/java'
JAVAC='/Library/Java/JavaVirtualMachines/jdk1.7.0_51.jdk/Contents/Home/bin/javac'
JAVACFLAGS='-source 1.4 -target 1.4'
JAVADOC='/Library/Java/JavaVirtualMachines/jdk1.7.0_51.jdk/Contents/Home/bin/javadoc'
JAVALIBS='-Wl,-framework,JavaVM'
JAVA_HOME='/Library/Java/JavaVirtualMachines/jdk1.7.0_51.jdk/Contents/Home'
JAVA_LIBRARY_PATH=''
JAVA_PRELOAD=''
JPLCFLAGS='-I'\''/Library/Java/JavaVirtualMachines/jdk1.7.0_51.jdk/Contents/Home/include'\'' -I'\''/Library/Java/JavaVirtualMachines/jdk1.7.0_51.jdk/Contents/Home/include/darwin'\'''

Nevertheless, I also get:

?- jpl:jpl_call('java.lang.System',getProperty,['java.version'],_G1413)
V = '1.6.0_65'.

So, it seems that JPL is built using Java 7 but at runtime it starts (the Apple provided and installed under /System) Java 6.

Cheers,

Paulo

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Paulo Moura
Logtalk developer

Email: <mailto:[email protected]>
Web:   <http://logtalk.org/>
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