#vulnerable code 
                                @Override
    public String get(String key) {
        return Jboot.getJbootCache().get(cache_name, key);
    } 
                            #location 3 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                @Override
    public String get(String key) {
        return Jboot.getCache().get(cache_name, key);
    }