java - Configuration vs. PropertiesConfiguration -

i having conceptual difficulties types configuration , propertiesconfiguration apache commons configuration.

propertiesconfiguration config = createconfig(); blazegraphembedded graph = blazegraphembedded.open(repo, config); 

createconfig() method:

public static propertiesconfiguration createconfig()     {         propertiesconfiguration config = null;         parameters params = new parameters();         basicconfigurationbuilder<propertiesconfiguration> builder =         new basicconfigurationbuilder<propertiesconfiguration>(propertiesconfiguration.class)                         .configure(params.basic()                         .setlistdelimiterhandler(new defaultlistdelimiterhandler(','))                         .setthrowexceptiononmissing(true));         try {             config = builder.getconfiguration();             config.addproperty("value_factory", bvf_extendo4000.instance);         } catch (configurationexception e) {             // todo auto-generated catch block             e.printstacktrace();         }     system.out.println("returning config.");     return config;     } 

i trying create configuration object pass open method in class blazegraphembedded. however, createconfig method returns propertiesconfiguration object, method blazegraphembedded.open(repository, configuration) not accept. not able cast propertiesconfiguration configuration, produced runtime error:

exception in thread "main" java.lang.classcastexception:  org.apache.commons.configuration2.propertiesconfiguration cannot cast  org.apache.commons.configuration.configuration 

i understand configuration interface implemented propertiesconfiguration, i'm fuzzy on details of how can use 2 different types make program run.

the problem in import statements. had:

import org.apache.commons.configuration.configuration; import org.apache.commons.configuration2.propertiesconfiguration; 

so importing 2 different sources, hence why types not compatible.