build.gradle

plugins {
    id "application"
}
apply plugin :"java"

description = "Java MainClass execution examples"
group = "com.baeldung"
version = "0.0.1"
sourceCompatibility = "1.8"
targetCompatibility = "1.8"

ext {
   javaMainClass = "com.baeldung.gradle.exec.MainClass"
}

jar {
    manifest {
        attributes(
            "Main-Class": javaMainClass
        )
    }
}

application {
    mainClassName = javaMainClass
}

task runWithJavaExec(type: JavaExec) {
    group = "Execution"
    description = "Run the main class with JavaExecTask"
    classpath = sourceSets.main.runtimeClasspath
    main = javaMainClass
}

task runWithExec(type: Exec) {
    dependsOn build
    group = "Execution"
    description = "Run the main class with ExecTask"
    commandLine "java", "-classpath", sourceSets.main.runtimeClasspath.getAsPath(), javaMainClass
}

task runWithExecJarExecutable(type: Exec) {
    dependsOn jar
    group = "Execution"
    description = "Run the output executable jar with ExecTask"
    commandLine "java", "-jar", jar.archiveFile.get()
}

task runWithExecJarOnClassPath(type: Exec) {
    dependsOn jar
    group = "Execution"
    description = "Run the mainClass from the output jar in classpath with ExecTask"
    commandLine "java", "-classpath", jar.archiveFile.get() , javaMainClass
}