public Set<Class<?>> findClasses(boolean proceedOnExceptions)
    throws ClassNotFoundException, IOException, LinkageError {
    return findClasses(this.getClass().getPackage().getName(), proceedOnExceptions);
  }
Finds the classes in current package (of ClassFinder) and nested packages.
@param proceedOnExceptions whether to ignore exceptions encountered for individual
                           jars/files/classes, and proceed looking for others.
hbase-common/src/test/java/org/apache/hadoop/hbase/ClassFinder.java