You (appear to ) have the same problem that I had. The comm.jar should be placed in the 'ext' directory, rather than the 'lib' directory. ( i think ).  The doc's are exceptionally outdated. I hope this helps.

Alexander Busch wrote:

Hi,having j2re1.3.1 running I am trying to run an app that requires the javax.comm package.I have taken a look at rxtx, and also downloaded the sparc version of the package, in order to somehow be able to do as described in the install instructions. However, I have to admit, that these instructions are not really clear.Can anybody help me and tell me what files I need exactely, where to find them, and how to set the classpath correspondingly? Is there any good installation instruction?The error message I am receiving is the following:Exception in thread "main" java.lang.NoClassDefFoundError: javax/comm/Unsupporte
dCommOperationException......It should work with just having installed the jre, doesn`t it? I am asking, as the instructions were all for the jdk version.I woudl appreciate any comments or general help.Thanks,alex

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