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Metamask: insufficient funds for gas * price + value in ropsten network with web3j (java)

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I can lead you by creating a HTTP server with a web3J Java library to interact with the Ropsen test network. This is how you can do it:

`Java

Import io.web3j.client.client;

Import IO.WEB3J.CLIENT.RPCEXCEPTION;

Import IO.WEB3J.CLIENT.RPCRESPONSE;

Import IO.WEB3J.Potocol.core.methods.Spons.ThtransctionResponse;

Import io.web3j.protocol.core.methods.Spons.Web3requestparames;

Import io.web3j.protocol.core.types.transction;

Public class Ropstenhtserver {

Private static final chain of the host = “ropsten.infura.io”;

Private static final port int = 8545; // default port for infuras

Public Static Void Main (String [] ARGS) {

Client client = new client (“https: //” + host + “:” + port);

// Set the requirements parameters

Web3requestparams Params = New Web3requestparames ()

.Sethost (host)

.Setport (port);

IF (Args.LeGth> 0 &&! Args [0] .startswith (“-“)) {

System.out.println (“Use: Java Roptenhttpserver [ARGS]”);

System.Exit (1); // EXIT with error code

}

WHILE (TRUE) {

try {

// Get a list of transactions sent from another account in Ropsten

List txlist = client.gettransactionsbyadress (“your_account_address”, Params);

// process the response to the transaction

for (TX transaction: txlist) {

System.out.println (TX);

}

} Catch (rpcexception e) {

System.out.println (E.GETMESAGE ());

}

try {

Fiber.seep (100); // sleep for 1 second before checking again

} Catch (interrupted ex) {

System.out.println (“interrupted during sleep:” + ex);

}

}

}

}

`

Please take note of:

  • You must replace " your_account_address " with your actual Ethereum account address.

  • Replace https: // ropsten.infura.io/ and and 8545's address URL of your Infura and default Port for test network Ropsen (which is 8545).

  • Use this code as a starting point. Depending on how you want to deal with errors, it is recommended to use errors processing mechanisms.

To build this Java program, save it in a file calledropstenhttpperver.javaand then perform it with the following command:

Bash

Javac ropstenhtpserver.java -cp "

Java -jar output.Jar

Replace Output.jar"in the above -mentioned order to your compiled file” ropstpserver.jar`.

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