problem in installing JDK1.5.0

[mechz]

try to be more clear, i'm in lack of ideas in this problem.
I downloaded jdk-1_5_0-linux-i586.bin and and execute the script
and install it at path : /home/mec/jdk1.5.0
and change my .bash_profile

My bash_profile contents :-

# .bash_profile

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

# User specific environment and startup programs

PATH=$PATH:/home/mec/jdk1.5.0/bin/java:/home/mec/apache-ant-1.6.2/bin
JAVA_HOME=/home/mec/jdk1.5.0
export JAVA_HOME

complete -C complete-ant-cmd ant build.sh
export PATH
unset USERNAME




.bashrc contents :
# .bashrc

# Source global definitions


if [ -f /etc/bashrc ]; then
. /etc/bashrc
fi

# User specific aliases and functions

when i type command echo $JAVA_HOME it gives :/home/rishabh/jdk1.5.0

But "type java" output is:
java is aliased to`/home/mec/j2sdk1.4.2_19/bin/java'

and "java -version" output is :
java version "1.4.2_19"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_19-b04)
Java HotSpot(TM) Client VM (build 1.4.2_19-b04, mixed mode)

(Note intially j2sdk1.4.2_19 was installed which i changed jdk1.5.0)

I have spend hours trying to play around with this but have got nowhere.

i want jdk1.5.0 on my system.

[Rubberman]

Your likely problem is here

PATH=$PATH:/home/mec/jdk1.5.0/bin/java:/home/mec/apache-ant-1.6.2/bin

You have several errors here.
1. You don't export PATH
2. You append the new java path instead of prepending it to the old PATH
3. You need to use ${PATH} in the new string when changing PATH itself, instead of $PATH.
4. You set your java path to /home/mec/jdk1.5.0/bin/java, a file name, instead of /home/mec/jdk1.5.0/bin, the directory for java.

Your PATH setting should therefor be as follows:

PATH=/home/mec/jdk1.5.0/bin:/home/mec/apache-ant-1.6.2/bin:${PATH}
JAVA_HOME=/home/mec/jdk1.5.0
export JAVA_HOME PATH

There are some other issues as well that will allow you to better use multiple java versions in your system without so many problems, but I won't get into them here. This should get you operational.