One more CLASSPATH question for V4R5

I set up a .profile file in my home directory containing:

/home/jdunn/jdom.jar:/home/jdunn/xerces.jar:/QIBM/ProdData/Java400/ext/db2_classes.jar:.

If I:   java ShowMeClasspath2
I get:
VERSION=1.3.0
CLASSPATH=/home/jdunn/jdom.jar:/home/jdunn/xerces.jar:/QIBM/ProdData/Java400/ext/db2_classes.jar:.
BOOTCLASSPATH=/QIBM/ProdData/Java400/jdk13/lib/rt.jar:/QIBM/ProdData/Java400/jdk13/lib/i18n.jar:/QIBM/ProdData/Java400/jdk13/lib/
sunrsasign.jar:/QIBM/ProdData/Java400/ext/IBMmisc.jar:/QIBM/ProdData/Java400/ext/jssl.jar:/QIBM/ProdData/Java400/ext/ibmjssl.jar:
/QIBM/ProdData/Java400/
$

If I run the java program in a shell script (Bld2.sh)
which contains this:
java ShowMeClasspath2

I get:

VERSION=1.3.0
CLASSPATH=.
BOOTCLASSPATH=/QIBM/ProdData/Java400/jdk13/lib/rt.jar:/QIBM/ProdData/Java400/jdk13/lib/i18n.jar:/QIBM/ProdData/Java400/jdk13/lib/
sunrsasign.jar:/QIBM/ProdData/Java400/ext/IBMmisc.jar:/QIBM/ProdData/Java400/ext/jssl.jar:/QIBM/ProdData/Java400/ext/ibmjssl.jar:
/QIBM/ProdData/Java400/
$

If I set up an environment variable named CLASSPATH containing:

/home/jdunn/jdom.jar:/home/jdunn/xerces.jar:/QIBM/ProdData/Java400/ext/db2_classes.jar:.

and:  Bld2.sh
I get:

VERSION=1.3.0
CLASSPATH=/home/jdunn/jdom.jar:/home/jdunn/xerces.jar:/QIBM/ProdData/Java400/ext/db2_classes.jar:.
BOOTCLASSPATH=/QIBM/ProdData/Java400/jdk13/lib/rt.jar:/QIBM/ProdData/Java400/jdk13/lib/i18n.jar:/QIBM/ProdData/Java400/jdk13/lib/
sunrsasign.jar:/QIBM/ProdData/Java400/ext/IBMmisc.jar:/QIBM/ProdData/Java400/ext/jssl.jar:/QIBM/ProdData/Java400/ext/ibmjssl.jar:
/QIBM/ProdData/Java400/

Why doesn't the .profile specified CLASSPATH "stick"?
Even though I have set up a .profile for myself, do I need to EXPORT my desired 
classpath in every shell script I attempt to run?

John