java - JUNG Exception in "main" :org/apache/commons/collections/Predicate -

i getting started java universal network/graph framework (jung). trying build basic graph using same. downloaded jung 2.0.1 libraries. collections-generic-4.0.1.jar , colt-1.2.0.jar. added included libraries eclipse project build path. getting following exception whenever trying run...

  
package grapheditor;   import edu.uci.ics.jung.graph.graph; import edu.uci.ics.jung.graph.sparsemultigraph; import edu.uci.ics.jung.graph.util.edgetype;  /**  * simplest jung2 graph creation example possible?  * shows how easy new jung2 graph interface , implementation class  * use.  * @author dr. greg m. bernstein  */ public class simplestgraph {             public static void main(string[] args) {         // graph<v, e> v type of vertices , e type of edges         sparsemultigraph<integer, string> g = new sparsemultigraph<integer, string>();         // add vertices. above defined these type integer.         g.addvertex((integer)1);         g.addvertex((integer)2);         g.addvertex((integer)3);          // add edges. above defined these of type string         // note default undirected edges.         g.addedge("edge-a", 1, 2); // note java 1.5 auto-boxes primitives         g.addedge("edge-b", 2, 3);                // let's see have. note nice output sparsemultigraph<v,e> tostring() method         system.out.println("the graph g = " + g.tostring());         // note can use same nodes , edges in 2 different graphs.         sparsemultigraph<integer, string> g2 = new sparsemultigraph<integer, string>();         g2.addvertex((integer)1);         g2.addvertex((integer)2);         g2.addvertex((integer)3);          g2.addedge("edge-a", 1,3);         g2.addedge("edge-b", 2,3, edgetype.directed);         g2.addedge("edge-c", 3, 2, edgetype.directed);         g2.addedge("edge-p", 2,3); // parallel edge         system.out.println("the graph g2 = " + g2.tostring());         } } 
  

i getting following exception:

  exception in thread "main" java.lang.noclassdeffounderror: org/apache/commons/collections/predicate     @ grapheditor.simplestgraph.main(simplestgraph.java:17) caused by: java.lang.classnotfoundexception: org.apache.commons.collections.predicate     @ java.net.urlclassloader$1.run(unknown source)     @ java.net.urlclassloader$1.run(unknown source)     @ java.security.accesscontroller.doprivileged(native method)     @ java.net.urlclassloader.findclass(unknown source)     @ java.lang.classloader.loadclass(unknown source)     @ sun.misc.launcher$appclassloader.loadclass(unknown source)     @ java.lang.classloader.loadclass(unknown source)     ... 1 more 

it made me thinking collections-generic-4.0.1.jar causing it. extracted , found package structure in org/apache/commons/collections15/predicate instead of org/apache/commons/collections/predicate. causing problem? in light appreciated...

write in code specify want predicate class from:

import org.apache.commons.collections15.predicate 

or if may need other classes inside package:

import org.apache.commons.collections15.* 

also, can extract .jar file , create new 1 correct path predicate class.