I'm using the gradle 'application' plugin to start my application. This works well.
Now I want to add the option to start a different main class in the same project. Can I change the plugin's configuration to allow that?
apply plugin: 'application'
mainClassName = "net.worcade.my.MainClass"
From http://mrhaki.blogspot.com/2010/09/gradle-goodness-run-java-application.html
apply plugin: 'java'
task(runSimple, dependsOn: 'classes', type: JavaExec) {
main = 'com.mrhaki.java.Simple'
classpath = sourceSets.main.runtimeClasspath
args 'mrhaki'
systemProperty 'simple.message', 'Hello '
}
Clearly then what you can change:
runSimple can be named whatever you want
set main as appropriate
clear out args and systemProperty if not needed
To run:
gradle runSimple
You can put as many of these as you like into your build.gradle file.
You can directly configure the Application Plugin with properties:
application {
mainClassName = project.findProperty("chooseMain").toString()
}
And after in command line you can pass the name of the main class:
./gradlew run -PchooseMain=net.worcade.my.MainClass
Here's how you can generate multiple start scripts if you need to package your apps
application {
applicationName = "myapp"
mainClassName = "my.Main1"
}
tasks.named<CreateStartScripts>("startScripts") {
applicationName = "myapp-main1"
}
val main2StartScripts by tasks.register("main2StartScripts", CreateStartScripts::class) {
applicationName = "myapp-main2"
outputDir = file("build/scripts") // By putting these scripts here, they will be picked up automatically by the installDist task
mainClassName = "my.Main2"
classpath = project.tasks.getAt(JavaPlugin.JAR_TASK_NAME).outputs.files.plus(project.configurations.getByName(JavaPlugin.RUNTIME_CLASSPATH_CONFIGURATION_NAME)) // I took this from ApplicationPlugin.java:129
}
tasks.named("installDist") {
dependsOn(main2StartScripts)
}
Use javaExec task to handle it :
task run(type: JavaExec) {
classpath = sourceSets.main.runtimeClasspath
if (project.hasProperty('first')){
if (chooseMain == 'Main1'){
main = 'application.Main1'
} else if (chooseMain == 'second'){
main = 'application.Main2'
}
} else {
println 'please pass the main name'
}
}
And from the command line pass your option in that way :
gradle run -PchooseMain=first
Related
Here is my tree files :
src
--JaJson.java
build.gradle
Here is my JaJson.java:
public class JaJson {
public static void main(String args[]) {
System.out.println("Hello");
}
public JaJson(){
System.out.println("what time is it ?");
}
public void getTime(){
System.out.println("Hammer time!");
}
}
Here is my gradle.build :
apply plugin: 'java'
apply plugin: 'eclipse'
//apply plugin: 'java-library'
apply plugin: 'application'
mainClassName = "JaJson"
// tag::repositories[]
repositories {
mavenCentral()
}
// end::repositories[]
java {
toolchain {
languageVersion = JavaLanguageVersion.of(11)
}
}
sourceSets {
single{
java {
srcDir 'src'
}
}
}
jar {
manifest {
attributes(
'Class-Path': configurations.compile.collect { it.getName() }.join(' '),
'Main-Class': 'JaJson'
)
}
}
task compileSingle(type: JavaCompile) {
source = sourceSets.single.java
sourceSets.main.java.srcDirs = ['src']
classpath = sourceSets.main.compileClasspath
destinationDirectory = sourceSets.main.output.classesDirs[0]
}
compileJava {
options.release = 7
}
version = '1.2.1'
// tag::dependencies[]
dependencies {
implementation "joda-time:joda-time:2.2"
testImplementation "junit:junit:4.12"
}
When i make a gradle build and a :
java -jar build\libs\jajson-1.2.1.jar
It works fine and print hello
But when i try to launch the class only with :
java build\classes\java\main\JaJson.class
I have a :
Impossible to found or load main class for build\classes\java\main\JaJson.class
And before each build i rm the builds folder.
rd /s /q build
gradle build && java -jar build\libs\jajson-1.2.1.jar && java build\classes\java\main\JaJson.class
regards
Run as
java -cp build/classes/main/java JaJason
As explained in the Java command's help you need to give the name of the main class, not a path to the main class. If your classes don't live in the current directory (or in their package directory right under the current directory), you need to specify the classpath:
--class-path classpath, -classpath classpath, or -cp classpath
[...] If the class path option isn't used and classpath isn't set, then the user class path consists of the current directory (.).
That said, you can also run a simple .java file straight from the command line:
java src/JaJson.java
This is useful to quickly run single-file programs without going through the whole Gradle build cycle.
I'm currently using LibericaJDK-11 as my default JRE in eclipse, also in my project. I added Gradle to my Project and everytime I Refresh the Project via Gradle. It sets the JRE to JavaSE-11. And i have to manually put it back to Liberica.
Is there a way to set a default JRE for Gradle in gradle.build oder gradle.settings?
The following code is my gradle.build.
plugins {
id 'java-library'
id 'application'
id 'pmd'
}
version = '0.0.1'
group = 'zuulsLostPlace.MainApp'
application{
mainClassName = "zuulsLostPlace.MainApp"
}
dependencies {
testImplementation 'org.junit.jupiter:junit-jupiter-api:5.4.2'
testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.4.2'
}
test {
useJUnitPlatform()
}
repositories {
mavenCentral()
}
task(runGameNoGUI, dependsOn: 'classes', type: JavaExec) {
group 'application'
description 'Starts the Text Adventure without GUI'
main = 'zuulsLostPlace.model.Game'
standardInput = System.in
ignoreExitValue true
classpath = sourceSets.main.runtimeClasspath
}
task(runGameGUI, dependsOn: 'classes', type: JavaExec) {
group 'application'
description 'Starts the Text Adventure with GUI'
main = 'zuulsLostPlace.MainApp'
standardInput = System.in
ignoreExitValue true
classpath = sourceSets.main.runtimeClasspath
}
task myJavadocs(type: Javadoc) {
source = sourceSets.main
tasks.withType(Javadoc) {
options.addStringOption('Xdoclint:none', '-quiet')
options.addStringOption('encoding', 'UTF-8')
options.addStringOption('charSet', 'UTF-8')
}
}
I'm experimenting with gradle and trying to setup a system that builds different flavors (brands) of an application, which differ by configuration mainly. What I have so far are two versions of the build scripts - both not working.
Version 1
First flavor specific resource folder flavor-res is added to sourcesets, which achieves overwriting some default resources. A task rule defines tasks for each flavor, which should (ideally) trigger build of the whole jar.
This works fine and generates the required jar, for one flavor at a time, like
gradle clean flavorOne
but the shadowJar task runs only once, if I do
gradle clean flavorOne flavorTwo
Stripped down Script:
sourceSets {
main {
...
resources {
srcDirs = ['src/main/resources', "${project.buildDir}/flavor-res/"]
}
}
}
shadowJar { classifier = 'SNAPSHOT' }
tasks.addRule("Pattern: flavor<Name>") { String taskName ->
if (taskName.startsWith("flavor")) {
String flavorName = (taskName - "flavor")
String flavorOutDir = "${project.buildDir}/${flavorName}"
// Set output folder and jar name
task("${taskName}Configure") {
outputs.dir(flavorOutDir)
doFirst {
archivesBaseName = flavorName
project.buildDir = flavorOutDir
}
}
// Copy res to folder used in sourcesets
task("${taskName}CopyResources") {
mustRunAfter = ["${taskName}Configure"]
outputs.dir("${project.buildDir}/flavor-res")
doFirst {
copy {
from "flavors/${flavorName}/"
into "${project.buildDir}/flavor-res/"
}
}
}
shadowJar.mustRunAfter = ["${taskName}Configure", "${taskName}CopyResources"]
// Define task that depends on shadowJar
task(taskName, dependsOn: ["${taskName}Configure", "${taskName}CopyResources",
shadowJar]) {
println "Configuring ${taskName}"
}
}
Sensing that it probably doesnt work because the change detection somehow doesnt work, I tried an alternative approach. Here is a simplified version of script
Version 2
Modified the rule to define a shadowJar dynamic task for each flavor.
/* Removed sourceSets in this version */
shadowJar { classifier = 'SNAPSHOT' }
tasks.addRule("Pattern: flavor<Name>") { String taskName ->
if (taskName.startsWith("flavor")) {
String flavorName = (taskName - "flavor")
String flavorOutDir = "${project.buildDir}/${flavorName}"
// Set resources for main sourceset
task("${taskName}Configure") {
outputs.dir(flavorOutDir)
doFirst {
archivesBaseName = flavorName
sourceSets.main.resources.srcDirs = ['src/main/resources', "${flavorOutDir}/flavor-res"]
project.buildDir = flavorOutDir
}
}
task("${taskName}CopyResources") {
outputs.dir("${flavorOutDir}/flavor-res")
dependsOn "${taskName}Configure"
doFirst {
copy {
from "flavors/${flavorName}/"
into "${project.buildDir}/flavor-res/"
}
}
}
// This should shadowJar for each flavor - but generate jars dont have the required artifacts.
task ("${taskName}Build", type: ShadowJar) {
from sourceSets.main.output
configurations = [ configurations.runtime ]
classifier = 'SNAPSHOT'
dependsOn "${taskName}CopyResources"
}
task(taskName, dependsOn: ["${taskName}Build"]) {
}
}
}
However, now, the generated jars are malformed. The first flavor gets just the artifacts for main, but no showed jars. The second jar has just the manifest and nothing else.
What would be the correct way of achieving that.
PS: No, its not an android application (flavor is just a synonym for a brand).
I decided to recreate a flavor build script, because it can be simplified to what you have now. The ShadowJar task can handle copying all the classes and resources by itself, there is no need to define separate ones. I also took some default configuration that would have been applied to the shadowJar task and applied this to the custom ShadowJar tasks to get the same behavior.
I first build a quick test project structure which can be found here:
Test Structure
Then I came up with the following script:
import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
plugins {
id 'java'
id "com.github.johnrengelman.shadow" version "2.0.4"
}
group 'your-group'
version 'dev-SNAPSHOT'
sourceCompatibility = 1.8
repositories {
mavenCentral()
}
dependencies {
// Example dependency
compile group: 'com.google.guava', name: 'guava', version: '19.0'
}
tasks.addRule("Pattern: flavor<Name>") { def taskName ->
if (!taskName.startsWith("flavor")) {
return
}
def flavorName = taskName - "flavor"
// Define the shadow task
def shadowTask = task ("${flavorName}ShadowJar", type: ShadowJar) {
classifier = flavorName
// Add our flavor resources, first to prioritize these resources
from file("src/main/flavors/${flavorName}")
// Include our project classes
from project.sourceSets.main.output
// Don't include duplicate resources, only the first ones added, in
// this case the flavored resources will override the default ones
duplicatesStrategy = DuplicatesStrategy.EXCLUDE
// Some defaults taken from the default shadowJar task
// https://github.com/johnrengelman/shadow/blob/master/src/main/groovy/com/github/jengelman/gradle/plugins/shadow/ShadowJavaPlugin.groovy#L48
configurations = [ project.configurations.runtime ]
manifest.inheritFrom project.tasks.jar.manifest
exclude('META-INF/INDEX.LIST', 'META-INF/*.SF', 'META-INF/*.DSA', 'META-INF/*.RSA')
}
// Define the flavor task
task ("${taskName}", dependsOn: shadowTask) {}
}
I have a Spring Boot + Angular 2 project. I want to deploy it to Heroku.
I'm able to run the npm build then copy the generated files over to the public folder (src/resources/public) manually, then run the backend build.
What I want to do is to set up a gradle build that will do all of that at once.
What I have so far is a gradle build that will build the front end, build the backend, however it does not copy the static files before generating the jar. Since the jar does not contain said static files, it won't work on Heroku.
Here's the project folder structure:
root
backend
src/main/java
src/main/resources
frontend
--> angular files go here
build/libs -> where the JAR file goes
The gradle build file:
buildscript {
repositories {
mavenCentral()
}
dependencies {
// spring
classpath('org.springframework.boot:spring-boot-gradle-plugin:1.5.2.RELEASE')
classpath('org.springframework:springloaded:1.2.6.RELEASE')
}
}
plugins {
id "com.moowork.node" version "1.2.0"
}
// gradle wrapper
task wrapper(type: Wrapper) {
gradleVersion = '3.4'
}
// configure gradle-node-plugin
node {
version = '8.1.4'
npmVersion = '5.0.3'
download = true
workDir = file("${project.projectDir}/node")
nodeModulesDir = file("${project.projectDir}/")
}
// clean node/node_modules/dist
task npmClean(type: Delete) {
final def webDir = "${rootDir}/frontend"
delete "${webDir}/node"
delete "${webDir}/node_modules"
delete "${webDir}/dist"
delete "${webDir}/coverage"
delete "${rootDir}/backend/src/main/resources/public"
}
// clean task for npm
task copyFiles {
doLast {
copy {
from "${rootDir}/frontend/dist"
into "${rootDir}/backend/src/main/resources/public"
}
}
}
// build task for npm
task frontendBuild {}
frontendBuild.dependsOn(npm_install)
frontendBuild.dependsOn(npm_run_build)
npm_install {
args = ['--prefix', './frontend']
}
npm_run_build {
args = ['--prefix', './frontend']
}
apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'idea'
apply plugin: 'org.springframework.boot'
sourceSets {
main {
java {
srcDirs = ['backend/src/main/java']
}
resources {
srcDirs = ['backend/src/main/resources']
}
}
}
copyFiles.dependsOn(frontendBuild);
compileJava.dependsOn(frontendBuild);
task backendBuild {}
backendBuild.dependsOn(compileJava)
backendBuild.dependsOn(jar)
jar.dependsOn(copyFiles)
repositories {
mavenCentral()
}
eclipse {
classpath {
containers.remove('org.eclipse.jdt.launching.JRE_CONTAINER')
containers('org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8')
}
}
idea {
module {
inheritOutputDirs = false
outputDir = file("${buildDir}/classes/main/")
}
}
jar {
baseName = 'expense-splitter'
version = '0.0.1'
}
sourceCompatibility = 1.8
targetCompatibility = 1.8
configurations {
dev
}
dependencies {
// spring
compile('org.springframework.boot:spring-boot-starter-web:1.5.2.RELEASE')
compile('org.springframework.boot:spring-boot-starter-data-jpa:1.5.2.RELEASE')
compile('org.springframework.boot:spring-boot-starter-security:1.5.2.RELEASE')
compile('org.apache.commons:commons-lang3:3.3.2')
// to make hibernate handle java 8 date and time types correctly
// it's marked as deprecated but we need to keep it until
// spring boot jpa starts using hibernate 5.2
compile('org.hibernate:hibernate-java8:5.1.0.Final')
// json web tokens
compile ('io.jsonwebtoken:jjwt:0.7.0')
compile 'mysql:mysql-connector-java'
// google gson
compile('com.google.code.gson:gson:2.8.0')
// jackson - parsing of java 8 date and time types
compile('com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.8.7')
// spring dev tools
dev('org.springframework.boot:spring-boot-devtools:1.5.2.RELEASE')
// testing
testCompile('org.springframework.boot:spring-boot-starter-test:1.5.2.RELEASE')
}
// run spring boot app
bootRun {
//addResources = true
classpath = sourceSets.main.runtimeClasspath + configurations.dev
jvmArgs = ["-Xdebug -agentlib:jdwp=transport=dt_socket,address=8080,server=y,suspend=n"]
}
// run all task
task runAll {}
runAll.dependsOn(bootRun)
Thanks in advance,
Try a different approach. Instead of manually copying the resources, tell Gradle that when it processes resources for the JAR, also take into consideration what is in frontend/dist/:
processResources {
from ('frontend/dist/') {
into 'public'
}
}
This should result in a JAR containing a public/ directory, with the contents of frontend/dist/ inside of it.
Gradle configuration for Spring Boot 1.5\2.x + Angular 2-6
Angular in sub-folder frontend
Frontend module
Crate build.gradle:
plugins {
id "com.moowork.node" version "1.2.0"
}
node {
version = '8.11.3'
npmVersion = '5.6.0'
download = true
workDir = file("${project.buildDir}/node")
nodeModulesDir = file("${project.projectDir}")
}
task build(type: NpmTask) {
args = ['run', 'build']
}
build.dependsOn(npm_install)
Note for Angular 6
Update outputPath value in angular.json to 'dist'
Backend module
Edit build.gradle for backend module:
Spring Boot 2.X:
bootJar {
archiveName = "yourapp.jar"
mainClassName = 'com.company.app.Application'
from('frontend/dist') {
into 'static'
}
}
Spring Boot 1.5.X:
jar {
archiveName = "yourapp.jar"
manifest {
attributes 'Main-Class': 'com.company.app.Application'
}
from('frontend/dist') {
into 'static'
}
from {
configurations.compile.collect { it.isDirectory() ? it : zipTree(it) }
}
}
Finally execute bootRepackage or bootJar task and check results in builds/libs
Assume that front end is located at the following folder: src/main/webapp/fe-ui/, the following solution for the Spring Boot version 2.1.1.RELEASE could be considered:
bootJar {
baseName = 'jar-name'
version = '0.1.0'
from('src/main/webapp/fe-ui/build') {
into 'public'
}
}
task installFeDependencies(type: NpmTask) {
args = ['install']
}
task buildFe(type: NpmTask) {
args = ['run', 'build']
dependsOn installFeDependencies
}
compileJava {
dependsOn buildFe
}
Running gradlew build will install, build front end as well as will invoke bootJar. The latter will package built front end bundle.
I have a probleme with my build.gradle, it's compile fine but when i try to execute the .jar the console give me this: "no manifest manifest attribute..."
it's my bluid.gradle:
apply plugin: 'java'
group = "com.xxx.xxx.xxx"
archivesBaseName = "xxx"
version = "0.1"
task pack(type: Jar, dependsOn: 'jar') {
inputs.files jar.archivePath;
jar {
baseName = 'xxxx'
version = '0.1'
}
manifest {
attributes(
"Manifest-Version" : "1.0",
"Main-Class" : "com.xxx.xxx.xxx.xxx"
)
}
doLast {
manifest.writeTo("${buildDir}/MANIFEST.MF")
project.ant {
taskdef name: "jarjar", classname: "com.tonicsystems.jarjar.JarJarTask", classpath: configurations.tools.asPath
jarjar(jarfile: archivePath, manifest: "${buildDir}/MANIFEST.MF") {
fileset(dir : "${buildDir}/classes")
fileset(dir : "${buildDir}/resources/main")
configurations.runtime.files.each { jarjarFile ->
zipfileset(src: jarjarFile) {
// WARNING: MUST keep META-INF/DgmInfo, META-INF/services, ... which are needed by Groovy
}
}
rule pattern: "*", result: "#0"
}
}
}
configurations {
tools
}
dependencies {
tools files("${rootDir}/tools/jarjar-1.4.jar")
compile files("${rootDir}/lib/bluecove-2.1.0.jar")
compile files("${rootDir}/lib/bluecove-gpl-2.1.0.jar")
}
}
I don't write the whole code, I don't really know to code a gradle script,
someone help ? :)
I understand that this part:
"Main-Class" : "com.xxx.xxx.xxx.xxx"
in reality is pointing to a valid Java class that has a main method inside, and the class is on your class path?
If yes, unzip your output jar, find META-INF folder and check what is inside MANIFEST.MF and tell us.