installation and configuration of java in ubuntu 11.10

hitesh03 · 03-03-2012, 02:29 AM

hii there, i have recently installed java from the package that i've downloaded from oracle's site manually.
but when i try to complie any java program,terminal says 'javac not found'.probably it may be arised due to no path set for java.

i've also installed open jdk-7 also.
so please help me out in this topic.

cin_ · 03-03-2012, 03:32 AM

What command are you using to compile your java program?

gcj() should come standard with all up to date linux environments... certainly your Ubuntu 11.10.

check out ...

Code:

man gcj

An example of use...

Code:

class QuickOut{
	public static void main(String args[])
	{
	try{
	    String QCK_OUT = "hazzah";
	    System.out.println(QCK_OUT);
	}catch (Exception e){System.err.println("Error: " + e.getMessage());}
	} 
}

Code:

# gcj --main="QuickOut" quickOut.java -o quickOut
# ./quickOut
hazzah

hitesh03 · 03-04-2012, 06:51 AM

it says in terminal -"The program 'gcj' is currently not installed. You can install it by typing:
sudo apt-get install gcj-jdk"

but i'm asking for how to make use of 'javac'.

cin_ · 03-04-2012, 07:38 AM

I use gcj().

But as far as your problem it doesn't sound javac() specific. Just sounds like a PATH issue.
You can check with...

Code:

# which javac
which: no javac in ($PATH)
# whereis javac
javac:

My results because I do not use javac().

If you manually installed it, that is, not from a package manager like apt-get(), you may need to update your PATH to include the folder where you placed the necessary binaries.
A simple process, just type...

Code:

# PATH=$PATH:/dir/to/JDK/binaries/

This tells your system that if a command is called you should look in all of the places you normally look and now also look in this directory as well.

Or, you could use ln() to create a link...

Code:

# ln -s /dir/to/YOUR_JDK/bin/javac /usr/bin/javac