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Java Forum / First Aid / February 2005setting up jikes on Linux with Blackdown
I've recently set up an older Mac running Linux (YDL 3.0.1) at home that I want to use for some Java development. I've installed IBM's Blackdown (1.4.2 SDK) rpm. I installed jikes (1.22) because, though javac works fine, any speed benefit I can get on this will be helpful, and I hear jikes beats javac in performance. My problem is that jikes wants the classpath set, but I don't know what to set it to. (I wish I knew what javac was using.) Normally I'd make sure to set it so that rt.jar is included for starters, but I can't find the jar! Anybody with jikes/Blackdown experience out there have any pointers for me? Sure would appreciate it. Assuming windows: <http://java.sun.com/j2se/1.5.0/install-windows.html#Environment> Might it be easier to get javac working first? -- Thufir Hawat > Assuming windows: > <http://java.sun.com/j2se/1.5.0/install-windows.html#Environment> > > Might it be easier to get javac working first? I did specify Linux, and that javac works fine already. Thanks, Tim Assuming windows: <http://java.sun.com/j2se/1.5.0/install-windows.html#Environment> Might it be easier to get javac working first? -- Thufir Hawat > My problem is that jikes wants the classpath set, but I don't know > what to set it to. You need to tell jikes where the standard libraries are. I've renamed jikes to jikes.bin, then use the following script (called jikes) instead: #!/bin/sh if [ -z "$JAVA_HOME" ]; then echo please set JAVA_HOME before using $0 exit 1 fi BCP=$JAVA_HOME/jre/lib/rt.jar JIKES=/usr/local/bin/jikes.bin exec $JIKES -bootclasspath $BCP "$@" Set JAVA_HOME "as usual" to point to the root of your JDK installation. You may need to adjust the BCP value to suit the Blackdown layout. /gordon  Signature[ do not email me copies of your followups ] g o r d o n + n e w s @ b a l d e r 1 3 . s e > You need to tell jikes where the standard libraries are. I've renamed > jikes to jikes.bin, then use the following script (called jikes) [quoted text clipped - 15 lines] > installation. You may need to adjust the BCP value to suit the > Blackdown layout. That's exactly the problem. Blackdown doesn't seem to include the standard libraries of rt.jar, because that file doesn't exist anywhere on my system. How can it be a J2SDK without rt.jar? Thanks, Tim > That's exactly the problem. Blackdown doesn't seem to include the > standard libraries of rt.jar, because that file doesn't exist anywhere > on my system. Download a JRE from Sun? > > That's exactly the problem. Blackdown doesn't seem to include the > > standard libraries of rt.jar, because that file doesn't exist anywhere > > on my system. > > Download a JRE from Sun? Sun doesn't supply a JRE for PPC Linux. That's why I'm using Blackdown from IBM. > That's exactly the problem. Blackdown doesn't seem to include the > standard libraries of rt.jar, because that file doesn't exist > anywhere on my system. How can it be a J2SDK without rt.jar? After posting my earlier reply, I downloaded the Blackdown JDK to check and found that it does contain rt.jar, and that it's in exactly the location my script refers to, i.e.: $JAVA_HOME/jre/lib/rt.jar This is the JDK I tested: java version "1.4.2-01" Java(TM) 2 Runtime Environment, Standard Edition (build Blackdown-1.4.2-01) Java HotSpot(TM) Client VM (build Blackdown-1.4.2-01, mixed mode) If you can't find it, my guess is that either your JDK is incomplete or you aren't looking hard enough. /gordon Signature[ do not email me copies of your followups ] g o r d o n + n e w s @ b a l d e r 1 3 . s e > > That's exactly the problem. Blackdown doesn't seem to include the > > standard libraries of rt.jar, because that file doesn't exist [quoted text clipped - 14 lines] > If you can't find it, my guess is that either your JDK is incomplete > or you aren't looking hard enough. If "find / -name rt.jar -print" as root can't find it, I guess the JDK must be incomplete. Though why they'd supply an incomplete JDK is beyond me. > If "find / -name rt.jar -print" as root can't find it, I guess the JDK > must be incomplete. Though why they'd supply an incomplete JDK is > beyond me. As far as I can tell, they don't. I see from another post that you're on PPC, so I tried that one too. [samhain]$ uname -a Linux samhain 2.4.20-8d #1 Sat Mar 15 19:38:12 EST 2003 ppc ppc ppc GNU/Linux This seems to be the latest PPC version: [samhain]$ ./j2re1.3.1/bin/java -version java version "1.3.1" Java(TM) 2 Runtime Environment, Standard Edition (build Blackdown-1.3.1-14-FCS) Classic VM (build Blackdown-1.3.1-14-FCS, native threads, nojit) [samhain]$ ./j2sdk/bin/java -version java version "1.3.1" Java(TM) 2 Runtime Environment, Standard Edition (build Blackdown-1.3.1-14-FCS) Classic VM (build Blackdown-1.3.1-14-FCS, native threads, nojit) [samhain]$ find . -name "rt.jar" ./j2re/lib/rt.jar ./j2sdk/jre/lib/rt.jar If you have an older or different version, try looking for classes.zip instead. /gordon Signature[ do not email me copies of your followups ] g o r d o n + n e w s @ b a l d e r 1 3 . s e > You need to tell jikes where the standard libraries are. I've renamed > jikes to jikes.bin, then use the following script (called jikes) > instead: [snip nice shell script] > > Set JAVA_HOME "as usual" to point to the root of your JDK > installation. You may need to adjust the BCP value to suit the > Blackdown layout. I set $BOOTCLASSPATH to the paths in sun.boot.class.path and then jikes is fine. (Much faster than javac, too.) None of them are rt.jar, but maybe IBM arranged and named things differently for some reason. Thanks, Tim Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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