Anyone use variables to shorten classpath declaration?

Anyone use variables to shorten classpath declaration? For example,
if I want to point to /opt/myclasses/testpackage.jar, could I do the
following?

update .profile to include

PACKAGE_DIR=/opt/myclasses

CLASSPATH=$PACKAGE_DIR/testpackage.jar
export CLASSPATH


The reason I am asking is because I am trying to troubleshoot an issue
where an application failed to find some jar files, and I found that
one profile sourced another, but the variable it uses as a shortcut
isn't defined at the time the CLASSPATH is defined, however, if I
check the path after all the source files are picked up it looks right
via "echo $CLASSPATH" because I have since defined PACKAGE_DIR.

For example, the definition aboe is switch to look like:

CLASSPATH=$PACKAGE_DIR/testpackage.jar
export CLASSPATH

PACKAGE_DIR=/opt/myclasses

I know it's a strange question, but I'm pulling out my hair trying to
figure out why we had CLASSPATH issues with our system.

.

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