Below are the program I am attempting to run, and the error I am getting.  I want to be able to access a root histogram in a program that I wrote in java, and not have to completely re-write my entire program in C++, because that would be an inefficient use of my time.  

Thanks.  

package hps.misc.bumpHunt;

import java.io.IOException;

import hep.aida.IAnalysisFactory;

import hep.aida.IHistogram1D;

import hep.aida.ITree;

import hep.aida.ITreeFactory;

import hps.misc.bumpHunt.BumpHunt;

import hps.misc.bumpHunt.BumpHuntMonitor;

import hps.misc.bumpHunt.PolynomialBackgroundFitter;

public class ReadHistogram {

public static void main(String arg[]) throws IllegalArgumentException, IOException{

IAnalysisFactory af = IAnalysisFactory.create();

ITreeFactory tf = af.createTreeFactory();

ITree tree0 = tf.create(arg[0], "root");

IHistogram1D hist1 = (IHistogram1D) tree0.find("mass");

//do some stuff with the histogram.

}

}

Root IO for Java, part of the FreeHEP library: http://java.freehep.org

Please report all bugs/problems to [log in to unmask]

Version $Id: RootFileReader.java 13538 2008-07-24 15:35:06Z tonyj $

Exception in thread "main" java.lang.NoSuchMethodError: org.apache.bcel.Repository.lookupClass(Ljava/lang/Class;)Lorg/apache/bcel/classfile/JavaClass;

at hep.io.root.core.ProxyBuilder.build(ProxyBuilder.java:81)

at hep.io.root.core.RootClassLoader.findClass(RootClassLoader.java:55)

at java.lang.ClassLoader.loadClass(ClassLoader.java:423)

at java.lang.ClassLoader.loadClass(ClassLoader.java:356)

at hep.io.root.core.GenericRootClass.getClass(GenericRootClass.java:136)

at hep.io.root.core.GenericRootClass.getProxyClass(GenericRootClass.java:152)

at hep.io.root.core.GenericRootClass.newInstance(GenericRootClass.java:92)

at hep.io.root.core.RootInputStream.readObject(RootInputStream.java:323)

at hep.io.root.core.RootRandomAccessFile.readObject(RootRandomAccessFile.java:138)

at hep.io.root.RootFileReader.init(RootFileReader.java:208)

at hep.io.root.RootFileReader.init(RootFileReader.java:156)

at hep.io.root.RootFileReader.<init>(RootFileReader.java:136)

at hep.aida.ref.root.RootStore.read(RootStore.java:75)

at hep.aida.ref.tree.Tree.init(Tree.java:1041)

at hep.aida.ref.tree.TreeFactory.createTree(TreeFactory.java:183)

at hep.aida.ref.tree.TreeFactory.create(TreeFactory.java:64)

at hps.misc.bumpHunt.ReadHistogram.main(ReadHistogram.java:17)