Executable Jar created by Gradle bootRepackage missing jars - eclipse

Question

What i'd like to do:
Creating an executable Jar using gradle, and eclipse as IDE.
Jar should include all libs required to run, and could be used inside a docker container.
Issues so far:
org.springframework.boot is not included in the Jar.
Code:
src/main/java/SampleController.java
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
#Controller
#EnableAutoConfiguration
public class SampleController {
#RequestMapping("/")
#ResponseBody
String home() {
return "Hello World!";
}
public static void main(String[] args) throws Exception {
SpringApplication.run(SampleController.class, args);
}
}
build.gradle
buildscript {
repositories {
jcenter()
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:1.5.10.RELEASE")
}
}
apply plugin: 'java-library'
apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'
// In this section you declare where to find the dependencies of your project
repositories {
// Use jcenter for resolving your dependencies.
// You can declare any Maven/Ivy/file repository here.
jcenter()
mavenCentral()
}
dependencies {
// This dependency is exported to consumers, that is to say found on their compile classpath.
api 'org.apache.commons:commons-math3:3.6.1'
// This dependency is used internally, and not exposed to consumers on their own compile classpath.
implementation 'com.google.guava:guava:21.0'
api 'org.springframework.boot:spring-boot-starter-web'
api 'org.springframework.boot:spring-boot-starter'
// Use JUnit test framework
testImplementation 'junit:junit:4.12'
}
springBoot {
mainClass = "SampleController"
}
sourceCompatibility = 1.8
targetCompatibility = 1.8
Command used:
In workspace/project/build/libs
java -jar project.jar
Error:
java : Exception in thread "main" java.lang.reflect.InvocationTargetException
At line:1 char:1
+ java -jar RSSFeedAggregator.jar
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (Exception in th...TargetException:String) [], RemoteException
+ FullyQualifiedErrorId : NativeCommandError
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48)
at org.springframework.boot.loader.Launcher.launch(Launcher.java:87)
at org.springframework.boot.loader.Launcher.launch(Launcher.java:50)
at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:51)
Caused by: java.lang.NoClassDefFoundError: org/springframework/boot/SpringApplication
at SampleController.main(SampleController.java:18)
... 8 more
Caused by: java.lang.ClassNotFoundException: org.springframework.boot.SpringApplication
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:94)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 9 more
I'm kind of a newbie when it comes to this. Does anyone has any ideas on how to resolve my problem ?

Answer 1

guess I found the solution.
From my understanding, when running directly in eclipse, gradle api / implementation automatically add the jars at runtime.
But when creating the fat jars with :bootRepackage, runtime libs need to be explicitly added. (The program runned well on eclipse directly)
runtime 'org.springframework.boot:spring-boot-starter'
runtime 'org.springframework.boot:spring-boot-starter-web'
This resolved my problem.
I won't close the topic yet if anyone has something to add on this issue.