#vulnerable code 
                                public FetchResponse fetch(RequestMeta meta) {
        if (riak == null)
            throw new IllegalStateException("Cannot fetch an object without a RiakClient");

        FetchResponse r = riak.fetch(bucket, key, meta);
        if (r.isSuccess()) {
            this.copyData(r.getObject());
        }
        return r;
    } 
                            #location 7 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                public FetchResponse fetch(RequestMeta meta) {
        if (riak == null)
            throw new IllegalStateException("Cannot fetch an object without a RiakClient");

        FetchResponse r = riak.fetch(bucket, key, meta);
        if (r.getObject() != null) {
            RiakObject other = r.getObject();
            shallowCopy(other);
            r.setObject(this);
        }
        return r;
    }