VM Exception: invalid JUMP when I call a second function

Question

I'm experimenting with Solidity Browser

Here is my contract code:

contract Test {

    mapping (address => uint256) weismap;

    function bet(uint vote) payable returns (uint256 weis) {
        if (msg.value==0) throw;
        weismap[msg.sender]= msg.value;
        return  weismap[msg.sender];
    }

    function test()  returns (uint myVote)  {
           return 1;
    }
}

If I set as transaction value 1

,create the contract and call the function bet with 1 as parameter

the function is run successfully.

If after that, I call the test() function I get

VM Exception: invalid JUMP

Any idea, about what's wrong?

Answer 1

You need to add the constant keyword to the test() function like:

pragma solidity ^0.4.0;
contract Test {
    mapping (address => uint256) weismap;

    function bet(uint vote) payable returns (uint256 weis) {
        if (msg.value==0) 
            throw;
        weismap[msg.sender]= msg.value;
        return  weismap[msg.sender];
    }

    function test() constant returns (uint myVote)  {
        return 1;
    }
}

Calling bet(...) with the value 2. Note that I'm sending 2 ethers as well with the transaction:

Now I call test() AND I've left the value 2. This call to test() fails as the constant function is being called as a transaction, not a read of the values off the blockchain:

If I call test() AND I've set value to blank, this call to test() succeeds as the constant function is being called as a read of the values off the blockchain: