NPE when calling getSuperType() for a class that extends Object

When <i>res </i> is pointing to a Java file, the the following code throws a NPE on <i>cl.getSuperType()</i> when there is no explicit extends specified in the java source.

JavaResource javaResource = (JavaResource) res.reify(JavaResource.class);
try {
if (javaResource.getJavaSource() instanceof JavaClass)

{ JavaClass cl = (JavaClass) javaResource.getJavaSource(); System.out.println(cl.getSuperType()); System.out.println(cl.getInterfaces()); }

} catch (FileNotFoundException e)

{ e.printStackTrace(); }