[Soot-list] soot.SootResolver$SootClassNotFoundException

[qpj]

Hi Everyone,
When I use this stmt,
SootClass sc = Scene.v().loadClassAndSupport("day28.HelloWorld");
the following exception came:
Exception in thread "main" soot.SootResolver$SootClassNotFoundException: couldn't find class: day28.HelloWorld (is your soot-class-path set properly?)
	at soot.SootResolver.bringToHierarchy(SootResolver.java:216)
	at soot.SootResolver.bringToSignatures(SootResolver.java:250)
	at soot.SootResolver.bringToBodies(SootResolver.java:291)
	at soot.SootResolver.processResolveWorklist(SootResolver.java:161)
	at soot.SootResolver.resolveClass(SootResolver.java:127)
	at soot.Scene.loadClass(Scene.java:608)
	at soot.Scene.loadClassAndSupport(Scene.java:594)
	at day28.CallGraphTest.main(CallGraphTest.java:22)





my code:
package day28;


import java.util.Iterator;
import java.util.List;


import soot.PackManager;
import soot.Scene;
import soot.SootClass;
import soot.SootMethod;
import soot.Transform;
import soot.jimple.toolkits.callgraph.CHATransformer;
import soot.jimple.toolkits.callgraph.CallGraph;
import soot.jimple.toolkits.callgraph.Sources;
import soot.options.Options;
import study.GrimpInstrumentor;


public class CallGraphTest {
	public static void main(String[] args) {
		Options.v().set_whole_program(true);
		Scene.v().addBasicClass("java.io.PrintStream",SootClass.SIGNATURES);
        Scene.v().addBasicClass("java.lang.System",SootClass.SIGNATURES);
        SootClass sc = Scene.v().loadClassAndSupport("day28.HelloWorld");
        sc.setApplicationClass();  
        List<SootMethod> list = sc.getMethods();
        for(SootMethod sm:list){
        	printPossibleCallers(sm);
        }
	}
	
	public static void printPossibleCallers(SootMethod target) {
		CHATransformer.v().transform();
		CallGraph cg = Scene.v().getCallGraph();
		Iterator sources = new Sources(cg.edgesInto(target));
		while (sources.hasNext()) {
			SootMethod src = (SootMethod)sources.next();
			System.out.println(target + " might be called by " + src);
		}
		}
}



The day28.HelloWorld is in the same package with CallGraphTest. This troubles me a lot, I hope you can help me.
Xiangxing
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