Can run as class file but not as a jar

This is driving me nuts! I have a class called ReceiveTrap. If can run it with the following command and it runs fine:
/usr/java/j2sdk1.4.0_01/bin/java -Djsnmp.loadRFC1213MIB=false -classpath /usr/jSNMP_trapd_server/lib/jSNMP.jar:/usr/jSNMP_trapd_server/lib/. ReceiveTrap
As soon as I package it in a jar I get the following:
Command:
/usr/java/j2sdk1.4.0_01/bin/java -Djsnmp.loadRFC1213MIB=false -classpath /usr/jSNMP_trapd_server/lib/jSNMP.jar -jar PCATrapd.jar
Output:
Exception in thread "main" java.lang.NoClassDefFoundError: com/outbackinc/services/protocol/snmp/SnmpTrapListener
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:509)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:246)
at java.net.URLClassLoader.access$100(URLClassLoader.java:54)
at java.net.URLClassLoader$1.run(URLClassLoader.java:193)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:186)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:265)
at java.lang.ClassLoader.loadClass(ClassLoader.java:262)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:322)
I can't figure out how one way it finds the jars for jSNMP and the other way it doesn't. Any suggestions are appreciated.
James

I believe I'm doing that correctly. My manifest is:
Manifest-Version: 1.0
Main-Class: PCATrapd.ReceiveTrap
[blank line]
It's definitely finding my main class. If I change the Main-class from PCATrapd.ReceiveTrap to just ReceiveTrap, then I get a java.lang.NoClassDefFoundError: ReceiveTrap
The ClassDef it says it can't find is located in the jar that's in my classpath, not PCATrapd.jar.
Thanks,
James

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