JAR file isn't found using java -cp

Hi all!
This works:
META-INF/MANIFEST.MF:
Manifest-Version: 1.0
Class-Path: TSA.JAR
Main-Class: p.Start
-which makes my jar file executable (as expected)
I need to be able to make changes in the classpath though, so I can change TSA.JAR to e.g. TSA2.JAR, TSA3.JAR etc. This should be obtainable by using the java -cp option, but this doesn't seem to work:
First, I delete the Class-Path line in the MANIFEST.MF file. Then I invoke java -cp TSA.JAR -jar MyProg.Startjava sais it cannot find some file contained in the TSA.JAR file.
What's happening? Why aren't the resources in the TSA.JAR file located? Does java expect to find Class-Path in the MANIFEST.MF file, and since it's not located it expects no classpath is set (even though specified by the -cp option) ??

Ok, I found this:
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4356783
-which states that when using the -jar option, all other classpaths are ignored. Just as all the authors of the numerous replies, I agree that this behaviour is too restrictive. The thread is worth browsing if you got 5 minutes to spare.
I solved my problem by not using the -jar option, but just to specify all involving resources by use of -cp option:
java -cp TSA.JAR;MyJar.JAR MyProg.Start

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