protected String getPackagePath(String packageName) {
    return packageName == null ? null : packageName.replace('.', '/');
  }
Converts a Java package name to a path that can be looked up with a call to
{@link ClassLoader#getResources(String)}.

@param packageName The Java package name to convert to a path
src/main/java/org/apache/ibatis/io/ResolverUtil.java