Gradle building rest spring app can’t find main class

I kept getting the follow error message. how to fix it.

FAILURE: Build failed with an exception.

Gradle building rest spring app can't find main class

  • What went wrong: Execution failed for task ‘:findMainClass‘. > org.gradle.api.tasks.SourceSetOutput.getClassesDir()Ljava/io/File;

plugins {
id ‘java’
id ‘idea’
id ‘eclipse’
id ‘org.springframework.boot’ version ‘2.1.7.RELEASE’

group ‘com.teamtreehouse’
version ‘1.0-SNAPSHOT’

sourceCompatibility = 1.8

repositories {

dependencies {
compile ‘org.springframework.boot:spring-boot-starter-web:2.1.7.RELEASE’




springBoot {
mainClass = “”

Note that mainclass  add your package name and main function name


both ./gradlew clean bootRun and ./gradlew clean build with java -jar build/libs/gs-rest-service-0.1.0.jar work well.

Good Luck


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