Error in using external jar in abstract portal component

Hi,

I created an abstract portal component application,that uses an external jar file from apache common collections(commons-collections4-4.0.jar).I had referenced this in NWDS in java build path.project was build successfully However,when I run it, it gives the below exception

java.lang.NoClassDefFoundError: org/apache/commons/collections4/ListUtils.

Can you please suggest if I missed anything here?.The above class is very much present in the said jar.

Regards

Veera