Jars dependent on different versions of the another jar

I have two vendor supplied jars that are both dependent on different releases of another jar. So, in the usage instructions for the first jar, it says to make sure that x_1_2_1.jar is my classpath. Likewise, in the usage instructions for my other jar, it says to make sure that x_2_0_1.jar is in my classpath. The installers for each one of these jar puts their version of the dependent x jar in a subdirectory under their installation.
This causes all sorts of headaches because neither jar ever gets completely what it is looking for. Code in the jar that depends on x_1 fails if x_2 is in the classpath first, while code in the jar that depends on x_2 fails if x_1 is the classpath first.
(Since, I'm sure to encounter this mismatched versioning problem with other "utility" jars in future, I'm intentionally withholding the actually names of the jars involved. I'm looking for the general solution to this class of problem, not specific tips related to a particular utilities jar.)
I was thinking that maybe the manifest Class-Path of each jar might be used to force where each jar looks for it's dependent jars, but the documentation I read about Manifests indicated that each jars Class-Path is simply concatenated into the overall Classpath that the ClassLoader uses.
If it matters, all this is in a Java 1.3.1 environment.
It seems like I can't be the first person to come up against this, but I haven't really seen any traffic on the forums about this kind of problem. (Am I missing something obvious?)

May be custom ClassLoaders may help you, but I am not sure. It depends on whether you are allowed to explicitly load several equally named classes from different sources.
Probably it is allowed. The following is cited from the Java Language Specification, 2nd edition (chapter 7.7, Unique Package Names, packages.doc.html):
"If unique package names are not used, then package name conflicts may arise far from the point of creation of either of the conflicting packages. This may create a situation that is difficult or impossible for the user or programmer to resolve. The class ClassLoader can be used to isolate packages with the same name from each other in those cases where the packages will have constrained interactions, but not in a way that is transparent to a na�ve program. "

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Jars dependent on different versions of the another jar

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