testnet 上的智能合约如何部署上去？

payloadType = Transaction.PayloadType.DEPLOY;
        payload = new TransactionDeployPayload("js", "var demo = 1;", "").toBytes();
        // deploy from == to
        tx = new Transaction(chainID, from, from, value, nonce, payloadType, payload, gasPrice, gasLimit);
        manager.signTransaction(tx,passphrase);

使用java版本sdk里面的测试demo部署智能合约，一直是pending状态，不能成功是为什么