Build.gradle for NetworkTable client

Technical Technical Discussion
1

Hello,

I’m attempting to build a Network Tables client (in Java) to run on a desktop host, but cannot figure out how to get gradle to load the dependencies. The program is currently reduced to the trivial:

package test5;

import edu.wpi.first.networktables.NetworkTable;

import edu.wpi.first.networktables.NetworkTableInstance;

public class App {
NetworkTable nt;

public String getGreeting() {
    return "Hello World!";
}

public static void main(String[] args) {
    NetworkTableInstance inst = NetworkTableInstance.getDefault();
    System.out.println(new App().getGreeting());
}

}

and my build.gradle:

plugins {
// Apply the application plugin to add support for building a CLI application in Java.
id ‘application’
id “edu.wpi.first.GradleRIO” version “2022.4.1”
}

repositories {
// Use Maven Central for resolving dependencies.
mavenCentral()
}

dependencies {
implementation wpi.java.deps.wpilib()
implementation wpi.java.vendor.java()

// Use JUnit Jupiter for testing.
testImplementation 'org.junit.jupiter:junit-jupiter:5.7.2'

// This dependency is used by the application.
implementation 'com.google.guava:guava:30.1.1-jre'

}

application {
// Define the main class for the application.
mainClass = ‘test5.App’
}

tasks.named(‘test’) {
// Use JUnit Platform for unit tests.
useJUnitPlatform()
}

The result:

  1. VS Code flags th imports as errors
  2. VS Code does not recognize the Network Table data types
  3. ./gradle build runs with out complaint (seems strange…)
  4. Attempting to run the program fails (hardly surprising) with:

Exception in thread “main” java.lang.Error: Unresolved compilation problems:
NetworkTableInstance cannot be resolved to a type
NetworkTableInstance cannot be resolved

I’m assuming that my build.gradle is not correctly resolving the dependencies. Any suggestions?

2

See the documentation below. You shouldn’t be using GradleRIO at all for a desktop program.

P.S. use triple-backtick (```) to quote blocks to make it easier to read in Discourse.

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