problems with java

ohade · 03-31-2006, 10:22 AM

Hi all,

I have 2 problems:
1) If I want to compile a file.java I must go to the directory where java had been installed. (can't just write java on shell)
2) After I compiled the java file I can't run it unless
I copy the file to the directory where java had been installed and write ./java HelloWorld ( and not ./java HelloWorld.class).

How can i fixed those problems?

Tnx.

marozsas · 03-31-2006, 11:33 AM

In Unix/Linux there is a environmental variable that specify where to search for a given command in CLI. It is PATH.

Code:

[miguel@sulfer ~]$ which javac
/usr/bin/which: no javac in (/usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin:/home/miguel/bin)
[miguel@sulfer ~]$ javac
-bash: javac: command not found
[miguel@sulfer ~]$ echo $PATH
/usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin:/home/miguel/bin
[miguel@sulfer ~]$ ls /usr/java/jdk1.5.0_06/bin/javac
/usr/java/jdk1.5.0_06/bin/javac
[miguel@sulfer ~]$ export PATH=${PATH}:/usr/java/jdk1.5.0_06/bin
[miguel@sulfer ~]$ which javac
/usr/java/jdk1.5.0_06/bin/javac
[miguel@sulfer ~]$

You need to set the PATH variable with the path of your java bin directory, just like I did above.

marozsas · 03-31-2006, 11:37 AM

I am not a java expert, but to run a java program, I think you need to setup a JAVA_HOME variable that points to the root dir of your java installation. In the previous example it is /usr/java/jdk1.5.0_06.

Code:

$ export JAVA_HOME=/usr/java/jdk1.5.0_06

ohade · 03-31-2006, 12:43 PM

About the first reply,

After I close and reopen the shell it didn't remember those commands.
How can I save those commands?

marozsas · 03-31-2006, 12:50 PM

put it in your .bashrc file.

bobbelfield · 03-31-2006, 04:10 PM

also there is no need to enter ".class" after the file name .That is the default parameter
The file to put JAVA_HOME in is bash_profile

# .bash_profile

# Get the aliases and functions
if [ -f ~/.bashrc ]; then
. ~/.bashrc
fi

# User specific environment and startup programs
JAVA_HOME=/usr/java/j2sdk1.4.1_03/bin/
PATH=$PATH:$HOME/bin:/usr/java/j2sdk1.4.1_03/bin/

export PATH JAVA_HOME
unset USERNAME