[fedora-java] openjdk's rt.jar

[Orion Poplawski]

Andrew Haley wrote:
> Orion Poplawski wrote:
>> -rw-r--r-- 1 root root 54M 2008-09-08 13:39
>> ./java-1.6.0-openjdk-1.6.0.0/jre/lib/rt.jar
>> -rw-r--r-- 1 root root 24M 2008-10-21 15:40
>> ./java-1.6.0-sun-1.6.0.10/jre/lib/rt.jar
>>
>> Why so much bigger?
> 
> I'd open them up and diff the trees.
> 
> Andrew.
> 

I think it's compression level.  Here are the uncompressed sizes:

167480  rt-sun
171788  rt-openjdk

[root at cynosure rt-sun]# dus
16      META-INF
48      sunw
7060    org
22396   java
30156   javax
38972   sun
68824   com

[root at cynosure rt-openjdk]# dus
16      META-INF
48      sunw
1336    net
7148    org
23576   java
31792   javax
39652   sun
68212   com

If I repack rt-openjdk: zip -r rt-openjdk.zip rt-openjdk

27M 2008-11-21 11:55 rt-openjdk.zip

So, we're packing jars with minimal compression?  No, 
/usr/lib/rpm/redhat/brp-java-repack-jars uses zip -9 and 
java-1.6.0-openjdk turns off __jar_repack.

So, something in the openjdk build does it...

Looks like it's built with:

if ! test -d /builddir/build/BUILD/icedtea6-1.4/bootstrap/jdk1.6.0 ; \
	then \
	  /usr/lib/jvm/java-openjdk/bin/jar cf 
bootstrap/jdk1.7.0/jre/lib/rt-closed.jar -C lib/rt com -C lib/rt java \
	    -C lib/rt javax -C lib/rt netscape -C lib/rt net -C lib/rt sun ; \
	else \
	  /builddir/build/BUILD/icedtea6-1.4/bootstrap/jdk1.6.0/bin/jar cf 
bootstrap/jdk1.7.0/jre/lib/rt-closed.jar -C lib/rt com -C lib/rt java \
	    -C lib/rt javax -C lib/rt netscape -C lib/rt net -C lib/rt sun ; \
	fi

So, does the "jar" command use compression?

-- 
Orion Poplawski
Technical Manager                     303-415-9701 x222
NWRA/CoRA Division                    FAX: 303-415-9702
3380 Mitchell Lane                  orion at cora.nwra.com
Boulder, CO 80301              http://www.cora.nwra.com