Weblogic InvocationTargetException

[jgal...@my-deja.com]

I am evaluating Weblogic 4.5.1 for Windows NT 4.0, service pack 4.
I can deploy beans written in Java 2, but when I my client program tries
to use them, I get an InvocationTargetException with the following stack
trace:

java.lang.reflect.InvocationTargetException:
java.lang.NoClassDefFoundError: com/sun/java/util/collections/Collection
at weblogic.rjvm.Kernel.declareProperties(Kernel.java:249)
at weblogic.rjvm.Kernel.ensureInitialized(Kernel.java:109)
at
weblogic.common.internal.DNSBasedRJVMFinder.findOrCreate(DNSBasedRJVMFin
der.java:203)
at
weblogic.common.internal.ServerURL.findOrCreateRJVM(ServerURL.java:156)
at
weblogic.jndi.WLInitialContextFactory.getInitialContext(WLInitialContext
Factory.java:265)
at
weblogic.jndi.WLInitialContextFactory.getInitialContext(WLInitialContext
Factory.java:180)
at
javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:672)
at
javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:250
)
at javax.naming.InitialContext.init(InitialContext.java:226)
at javax.naming.InitialContext.<init>(InitialContext.java:202)
at masteringejb.helloworld.HelloClient.main(HelloClient.java:22)
at java.lang.reflect.Method.invoke(Native Method)
at com.borland.jbuilder.util.BootStrap.invokeMain(Unknown
Source)
at com.borland.jbuilder.util.BootStrap.main(Unknown Source)

If anyone knows how to solve this problem, please tell me the
solution. Thank you!

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[jgal...@my-deja.com]