update template and fix few bugs

app/build.gradle

@@ -27,7 +27,7 @@ java {
 
 application {
     // Define the main class for the application.
-    mainClass = 'org.example.App'
+    mainClass = 'dev.project516.JavaAppTemplate.Main'
 }
 
 compileJava.dependsOn spotlessApply
@@ -44,7 +44,11 @@ spotless {
 jar {
     manifest {
         attributes(
-            'Main-Class': 'org.example.App'
+            'Main-Class': 'dev.project516.JavaAppTemplate.Main'
         )
     }
+}
+
+run {
+    standardInput = System.in
 }

app/src/main/java/dev/project516/JavaAppTemplate/Main.java

@@ -0,0 +1,13 @@
+package dev.project516.JavaAppTemplate;
+
+public class Main {
+
+    public String greetUser() {
+        return "Hello!";
+    }
+
+    public static void main(String[] args) {
+
+        System.out.println(new Main().greetUser());
+    }
+}

app/src/test/java/dev/project516/JavaAppTemplate/MainTest.java

@@ -0,0 +1,13 @@
+package dev.project516.JavaAppTemplate;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+public class MainTest {
+    @Test
+    public void testGreetsUser() {
+        Main classUnderTest = new Main();
+        assertNotNull("Should greet the user", classUnderTest.greetUser());
+    }
+}

test.sh

@@ -1,5 +1,5 @@
 #!/bin/sh
 
-./gradlew build
+./gradlew build || exit 1
 
 java -jar app/build/libs/app-all.jar