java.lang.NoClassDefFoundError: org/apache/commons/collections/Transformer

Question

I am receiving the following error java.lang.NoClassDefFoundError: org/apache/commons/collections/Transformer trying to use BeanMap from the Apache

Answer 1

I am not really sure, but i think your error is because of jar versions. Lately apache has changed the package of the new versions of their jars because they implement new functionality or something that is not fully backward compatible. For example the jar commons-beanutils-1.9.2.jar depends on commons-collections-3.2.1.jar (according to this site) and you are using commons-collections-4.4.0.jar. If you are planning using the universe of apache jars, you need to be sure that they are all compatible.