On Tue, 2004-03-16 at 12:21, fedora-list-request@xxxxxxxxxx wrote: > Kaustubh Ghosh wrote: > I am quite novice towards java programming in linux.To start with I installed > j2re1.4.2_03 and also j2sdk1.4.2_04 in FC1(Both from java.sin.com).Now > peculiar problems arise. > When I type "java -version" it gives 1.3.1( > When I type "/usr/java/j2sdk1.4.2_04/bin/java -version" it gives 1.4.2_04. > Anyway I can compile any .java file with javac. > But when I try to run it with java(any of the above) the gui would not > come.(Hello World executes perfectly with System.out.println as also other > non-gui programs). You have both Sun's Java and GNU's Java installed. GNU's Java comes by default when you select all of the compilers during the install. What I did was to find all the matching files in /usr that were supplied by Sun's J2SDK and moved them to a /usr/<directory>/orig. I then added my $JAVA_HOME/bin and $JAVA_HOME/jre/javaws to my PATH variable. javaws is where Java WebStart is located. Like you, I have multiple Java versions installed. I usually keep the current release and the previous release around in case something breaks in the current release that didn't break in the previous release. To do this I make a symbolic link from where I installed Java to /usr/java. For example, if I have j2sdk1.4.2_02 and j2sdk1.4.2_04 installed in /usr, I will link /usr/j2sdk1.4.2_04 to /usr/java. I then set JAVA_HOME to /usr/java. This arrangement seems to work reasonably well. Another approach would be to not make the link to /usr/java and just set the JAVA_HOME environment variable appropriately. However, in both cases you'll need to take the GNU commands out of your path and make sure that you have the Sun-supplied versions in your path. HTH /mde/
