[Ethereum] Creating an account using web3js or web3j

I fixed it. UI front-end now works, pulling contract data through to the browser.

I was not careful with my port references between geth/cors, http-server, and the one referenced in my UI javascript as Péter Szilágyi sniffed out. I list my working steps below to help others trace similar problems:

First: start geth using: geth --rpc --rpccorsdomain="http://localhost:3000" //presuming the UI will be run on port 3000

Second: Launch the http server on the above referenced port. In my case, used the npm installed module 'http-server': http-server -p 3000 //must match the port referenced in rpccorsdomain above.

Third: Made sure web3 was installed with npm. Linked app.js to index.html and included this code at the top:

 var Web3 = require('web3');

// Initialize connection
 var web3 = new Web3(new Web3.providers.HttpProvider('http://127.0.0.1:8545'));  //may want to test for non-existence first per docs
 var ABI = [...]
 var greeterAddress = "..."
 var greeter = web3.eth.contract(ABI).at(greeterAddress);

Since your example code uses truffle-contract you can specify the default values for your transactions and contract deployments like this (Conferrence is the name of your contract. I used the truffle default values):

Conferrence.defaults({
  from: account,
  gas: 4712388,
  gasPrice: 100000000000
})

I had the same problem (base fee exceeds gas limit) and browser-solidity gave me a Gas requirement of function xyz.sol:Xyz.doSomething(address) unknown or not constant. Specifying default values helped eventually.