Wie kann ich auf web3j eine Liste aller Dozenten anzeigen, die zu meiner Blockchain hinzugefügt wurden?

Ich muss auf einem HTML eine Liste aller Ausbilder anzeigen, die auf der Liste eingerichtet sind

pragma solidity ^0.4.18;

contract Owned {
address owner;

function Owned() public {
    owner = msg.sender;
}
modifier onlyOwner {
   require(msg.sender == owner);
   _;
 }
}

contract Courses is Owned {

struct Instructor {
    uint age;
    bytes16 fName;
    bytes16 lName;
}

mapping (address => Instructor) instructors;
address[] public instructorAccts;

event instructorInfo(
   bytes16 fName,
   bytes16 lName,
   uint age
);

function setInstructor(address _address, uint _age, bytes16 _fName, bytes16 _lName) onlyOwner public {
    var instructor = instructors[_address];

    instructor.age = _age;
    instructor.fName = _fName;
    instructor.lName = _lName;

    instructorAccts.push(_address)-1;
    instructorInfo(_fName, _lName, _age);
}

function getInstructors() view public returns(address[]) {
    return instructorAccts;
}

function getInstructor(address _address) view public returns (uint, bytes16, bytes16) {
    return (instructors[_address].age, instructors[_address].fName, instructors[_address].lName);
}

function countInstructors() view public returns (uint) {
    return instructorAccts.length;
}

}

UPDATE: mein web3js-Code

  <script>
       if (typeof web3 !== 'undefined') {
    web3 = new Web3(web3.currentProvider);
} else {
    web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));
}

web3.eth.defaultAccount = web3.eth.accounts[1];

var CoursetroContract = web3.eth.contract([
{
    "constant": true,
    "inputs": [
        {
            "name": "_address",
            "type": "address"
        }
    ],
    "name": "getInstructor",
    "outputs": [
        {
            "name": "",
            "type": "uint256"
        },
        {
            "name": "",
            "type": "bytes16"
        },
        {
            "name": "",
            "type": "bytes16"
        }
    ],
    "payable": false,
    "stateMutability": "view",
    "type": "function"
},
{
    "constant": true,
    "inputs": [],
    "name": "getInstructors",
    "outputs": [
        {
            "name": "",
            "type": "address[]"
        }
    ],
    "payable": false,
    "stateMutability": "view",
    "type": "function"
},
{
    "constant": true,
    "inputs": [
        {
            "name": "_index",
            "type": "uint256"
        }
    ],
    "name": "getInstructorAtIndex",
    "outputs": [
        {
            "name": "",
            "type": "uint256"
        },
        {
            "name": "",
            "type": "bytes16"
        },
        {
            "name": "",
            "type": "bytes16"
        }
    ],
    "payable": false,
    "stateMutability": "view",
    "type": "function"
},
{
    "constant": true,
    "inputs": [
        {
            "name": "",
            "type": "uint256"
        }
    ],
    "name": "instructorAccts",
    "outputs": [
        {
            "name": "",
            "type": "address"
        }
    ],
    "payable": false,
    "stateMutability": "view",
    "type": "function"
},
{
    "constant": true,
    "inputs": [],
    "name": "countInstructors",
    "outputs": [
        {
            "name": "",
            "type": "uint256"
        }
    ],
    "payable": false,
    "stateMutability": "view",
    "type": "function"
},
{
    "constant": false,
    "inputs": [
        {
            "name": "_address",
            "type": "address"
        },
        {
            "name": "_age",
            "type": "uint256"
        },
        {
            "name": "_fName",
            "type": "bytes16"
        },
        {
            "name": "_lName",
            "type": "bytes16"
        }
    ],
    "name": "setInstructor",
    "outputs": [],
    "payable": false,
    "stateMutability": "nonpayable",
       "type": "function"
},
{
    "anonymous": false,
    "inputs": [
        {
            "indexed": false,
            "name": "fName",
            "type": "bytes16"
        },
        {
            "indexed": false,
            "name": "lName",
            "type": "bytes16"
        },
        {
            "indexed": false,
            "name": "age",
            "type": "uint256"
        }
    ],
    "name": "instructorInfo",
    "type": "event"
        }
     ]);

  var Coursetro = 
  CoursetroContract.at('0x13fd9e45bbd7ee860cdfc825839c9dfbd91a36cd');
  var instructorEvent = Coursetro.instructorInfo({}, 'EARLIEST');

instructorEvent.watch(function(error, result) {
    if (result) {
        if (result.blockHash != $("#insTrans").html())
             $("#loader").hide();
         $("#insTrans").html('Block hash: ' + result.blockHash);
        $("#instructor").html(web3.toAscii(result.args.fName) + ' ' + web3.toAscii(result.args.lName) + ' (' + result.args.age + ' Kb)');
    } else {
         $("#loader").hide();
    }
});

Coursetro.countInstructors((err, res) => {
    if (res)
     $("#countIns").html(res.c + ' number of files');
})

$("#button").click(function() {
     //$("#loader").show();
    Coursetro.setInstructor(web3.eth.defaultAccount, $("#age").val(), $("#fName").val(), $("#lName").val(), (err, res) => {
        if (err) {
            $("#loader").hide();
        }
    });
});