Contract creating another contract using Web3 getting out of gas error despite gas value being large (e.g. 50,000,000)

Question

I wrote a contract A that creates a new contract B and returns the address of the new contract B that's been created. When I tested this on solidity browser it seems to work well, but when I tried to run the create method using web3, I keep getting this error:

        throw errors.InvalidResponse(result);
    ^
Error: VM Exception while processing transaction: out of gas

Here's my contract code:

pragma solidity ^0.4.2; 
contract B { 
   int public id;
   function B(int _id) { 
     id = _id;
   }
} 

contract A { 
   address Baddress;
   function createB(int _id) returns (address) { 
     Baddress = new B(_id); 
     return Baddress;
   } 
}

Here's my Javascript code that attempts to run A's createB method:

web3.eth.defaultAccount = web3.eth.coinbase;
var Acontract = web3.eth.contract([{"constant":false,"inputs":[],"name":"getdum","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"num","type":"int256"}],"name":"create","outputs":[],"payable":false,"type":"function"}]);

var A = Acontract.new({from: web3.eth.accounts[0], 
data: '{{compiled byte code}}', 
gas: '47000000'}, function (e, contract){
   console.log(e, contract);
   if (typeof contract.address !== 'undefined') {
     console.log('Contract mined! address: ' + contract.address);
     contract.createB(5000).then(console.log); // This line throws the error
   }
})

I've read many other related posts and could only find answers that suggest to use more gas, but no matter how much gas I sent with the transaction, it would throw the same error. You can see I'm using a really large value for gas in the code. Can anyone help me identify what I'm doing wrong? I'm using solc Version: 0.4.9+commit.364da425.Darwin.appleclang, EthereumJS TestRPC v3.0.3, and node v6.4.0.

Answer 1

After replicating this, I discovered the issue.

You'll need to specify the gas again when you send the .createB() transaction. That is, if you use .createB(5000), it only uses the default gas limit of 90000 and fails. Setting the gas limit to higher, with .createB(5000, {gas: 200000}) was successful for me. browser-solidity gives a more accurate value of 113598 for the transaction's cost.