Not able to create JAR file for gradle project - spring-boot

Question

I want to create a jar file which I can upload on AWS, but every time I run the command 'gradle jar' from command prompt I get the following error.
> Task :compileJava FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':compileJava'.
> Compilation failed; see the compiler error output for details.
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --
debug option to get more log output. Run with --scan to get full insights.
* Get more help at https://help.gradle.org
I get 'Build Successful' whenever I run 'gradle clean' in command prompt. Here is the content of build.gradle:
buildscript {
ext {
springBootVersion = '2.0.4.RELEASE'
}
repositories {
mavenCentral()
maven {
url "https://plugins.gradle.org/m2/"
}
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
classpath "net.ltgt.gradle:gradle-apt-plugin:0.18"
}
}
apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'
apply plugin: 'io.spring.dependency-management'
apply plugin: 'net.ltgt.apt'
group = 'com.myproject.api'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = JavaVersion.VERSION_1_8
ext {
lombokVersion = '1.16.20'
mapstructVersion = '1.2.0.Final'
}
repositories {
mavenCentral()
mavenLocal()
jcenter()
flatDir {
dirs 'libs'
}
}
dependencies {
compile('org.springframework.boot:spring-boot-starter-web')
compile('org.springframework.boot:spring-boot-starter-data-jpa')
compile('org.springframework.boot:spring-boot-starter-mail')
compile('org.springframework.boot:spring-boot-starter-thymeleaf')
compile('org.springframework.data:spring-data-jpa')
compile('io.springfox:springfox-swagger2:2.9.2')
compile('io.springfox:springfox-swagger-ui:2.9.2')
compile group: 'commons-io', name: 'commons-io', version: '2.6'
compile group: 'org.json', name: 'json', version: '20180813'
compile files('libs/checksum_2.0.0.jar')
compileOnly("org.projectlombok:lombok:${lombokVersion}")
compileOnly("org.mapstruct:mapstruct-jdk8:${mapstructVersion}")
compileOnly("org.mapstruct:mapstruct-processor:${mapstructVersion}")
runtime('org.springframework.boot:spring-boot-devtools')
runtime('mysql:mysql-connector-java')
testCompile('org.springframework.boot:spring-boot-starter-test')
}
eclipse {
classpath {
file.whenMerged { cp ->
cp.entries.add( new org.gradle.plugins.ide.eclipse.model.SourceFolder('build/generated/source/apt/ma
in', null) )
}
}
}
Do I need to add any plugins? Thanks in advance. Please help

Answer 1

Open task manger and force stop Java(TM) Platform SE binary and delete
C:\Users\{current user}\.gradle\caches\jars-9\jars-9.lock file

Answer 2

I was using 'gradle clean' and 'gradle build' instead of 'gradlew clean' and 'gradlew build'. gradlew commands worked for me.