how set enlarged java classpath windows?

i'm perplexing run sole junit exam palm windows xp management line, an perceptibly high array elements category path. i've attempted several variations, such as:

set class_path=c:\path\a\b\c;c:\path\e\f\g;....
set class_path=%class_path%;c:\path2\a\b\c;c:\path2\e\f\g;....
...
c:\apps\jdk1.6.0_07\bin\java.exe -client oracle.jdevimpl.junit.runner.testrunner com.myco.myclass.mytest testmethod

(other variations sourroundings classpath line, sourroundings classpath around -classpath an justification java"). always comes down console throwing adult it's hands error:

the quarrel line too long.
the syntax management incorrect.

this junit exam contrast rather infinite existent leave project, suggestions rearranging office structure something some-more reasonable, those forms solutions out now. i only perplexing gen adult discerning exam opposing digest run management line, console stonewalling me. help!