Execution of java and javac commands

[Alfred Vahau]

I have installed the j2sdk1.4.2_10 Java binary on my Ubuntu system 
(Warty) and made a symbolic to the java and javac commands in 
/usr/bin/java and /usr/bin/javac. /usr/bin is on the PATH environment. 
Where I issue the which java command, it returns a blank line. When I 
issue whereis java
it returns a positive output: java: /usr/bin/java

I conclude that the output of the which command is an acknowledgement  
of the path being correct. For instance, I can issue which perl and get 
the result
/usr/bin/perl so the perl command is on the system path.

The java symbolic links are soft links  and created thus

ln -s /usr/local/bin/j2sk1/4/2_10/bin/java /usr/bin/java
ln -s /usr/local/bin/j2sk1/4/2_10/bin/java /usr/bin/javac

The java binary file (with extension bin) was unpacked in the 
/usr/local/bin directory.
How can I get the system to recognize that java and javac are on the 
environment path? I have tried rebooting (I didn't think this was 
necessary but tried anyway and it didn't make a difference.) For noting 
the execution of the java command is successful when I am in the 
directory containing the command and issuing a command for an example 
like so:

./java -jar SampleTree.jar

and I get a window with the demonstrated output.

Thanks in advance for any pointers.

Alfred,

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