Localhost peer not detected error when trying to connect to Bitcoind server via JSON RPC from Java Application

[Juhar Ahmed]

I am running Bitcoin Network on local Ubuntu machine. The network consists of multiple nodes. I want to connect to the network from a java application running on the same machine via JSON RPC. I can connect to the Bitcoind server from command line using bitcoin-cli. However, I cannot to the Bitcoind server from the Java application using Bitcoinj Libraray. I suspect that the problem is related to RPC authentication. I specified rpc username and password in the bitcoin.conf file and I tried to use Java Authenticator in my Java code. However, it hasn't solved the problem.

        Authenticator.setDefault(new Authenticator() {
                    protected PasswordAuthentication getPasswordAuthentication() {
    return new PasswordAuthentication (rpcuser, rpcpassword.toCharArray());
                    }});

My bitcoin.conf file is as follows:

    regtest=1
    server=1
    listen=1
    rpcuser=user
    rpcpassword=password
    fallbackfee=0.0001
    [regtest]
    port=10000
    rpcport=20000
    bind=127.0.0.1
    rpcbind=127.0.0.1
    rpcallowip=127.0.0.1

This is the log message I see when from the Bitcoind server side:
https://i.stack.imgur.com/ttEyH.png

And this is the error I am receiving on the application side:
https://i.stack.imgur.com/84WvF.png

I am using Bitcoin core version 22 for the server and Bitcoinj library version 16.1 (https://bitcoinj.org/getting-started) to connect to the server