I'm trying to deploy a smart contract (7 nodes sample from Quorum) using web3j. It fails at get() to get the contract wrapper object. If I check the logs, a new transaction will show up, but if I call any contract function, it will give me a null pointer exception. My code looks like this:

    String deployeraccount = "0xed9d02e382b34818e88b88a309c7fe71e65f419d";
    String privfor = "QfeDAys9MPDs2XHExtc84jKGHxZg/aj52DTh0vtA3Xc=";

    try {

        Quorum quorum = Quorum.build(new HttpService("http://localhost:22000"));

        ClientTransactionManager transactionManager = new ClientTransactionManager(
                quorum, deployeraccount, Arrays.asList(privfor));

        BigInteger gasPrice = BigInteger.valueOf(30000);
        BigInteger gasLimit = BigInteger.valueOf(100000); 
        BigInteger initialWeiValue = BigInteger.valueOf(0);
        Uint256 initVal = new Uint256(BigInteger.valueOf(0));

        System.out.println(">> Before deploy");

        Future<Simplestorage> ft = Simplestorage.deploy(    quorum, 
                                                            initVal     );
        System.out.println(">> deploy");

        while (!ft.isDone()) {

        System.out.println(">> after wait");

        Simplestorage ss = ft.get();

I already tried changing the gas value, but still got the same issue. Thanks.

  • I used the default wrapperobject.GAS_PRICE and wrapperobject.GAS_LIMIT. Now it works.
    – vincent
    Aug 3, 2017 at 7:32
  • 1
    Could you create an answer adding a few more details of what you did? Comments shouldn't be relied on to exist forever, and if you add an answer it may get some upvotes :-) Aug 22, 2017 at 15:53
  • @RichardHorrocks I added that thin information as an answer. I did make it a community wiki though, as I didn't feel comfortable getting credit for an answer that wasn't mine. Plus a community wiki allows people to enhance it. Feb 21, 2018 at 1:27
  • This implementation now is deprecated with the quorum 4.0.6v. Do you update de Web3j quorum version?? Feb 7, 2019 at 8:10

1 Answer 1


Note: This is a community wiki from the author's own response in a comment. Let's improve on it.

I used the default wrapperobject.GAS_PRICE and wrapperobject.GAS_LIMIT. Now it works.

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