in src/share/classes/java/io/ObjectInputStream.java we have the following code:

        try {
            if ((cl = resolveProxyClass(ifaces)) == null) {
                throw new ClassNotFoundException("null class");
            }
        } catch (ClassNotFoundException ex) {
            resolveEx = ex;
        }

This code might be more efficient if rewritten as

        try {
            if ((cl = resolveProxyClass(ifaces)) == null) {
                resolveEx = ClassNotFoundException("null class");
            }
        } catch (ClassNotFoundException ex) {
            resolveEx = ex;
        }

This pattern occurs once more within that file.