Running SpringBoot app from IntelliJ IDEA fails for modular project

user_2774914 0
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My project is a SpringBoot application, which contains one java module. This module does not open any of its packages.

module-info.java

module my.somewhere
{ 
    requires spring.core;
    requires spring.context;
    requires spring.boot;
    // and so on
}

The app runs as expected when called from command line mvn clean spring-boot:run.

But when I try to start it from the main method of the SpringBootApplication, the following error appears in console: java.lang.IllegalAccessException: module my.somewhere does not open my.somewhere.abc to module spring.core (see detailed stack below).

It looks reasonable to have something opened to Spring due to its reflection operations, but I wonder why maven manages to run it without problems.

Please, help me to understand how to make the app run similarly from Maven 3.6.1 and from IntelliJ IDEA 2019.3.

Detailed stack:

org.springframework.cglib.core.CodeGenerationException: java.lang.IllegalAccessException-->module my.somewhere does not open my.somewhere.abc to module spring.core
    at spring.core@5.2.4.RELEASE/org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:514) ~[spring-core-5.2.4.RELEASE.jar:na]
    at spring.core@5.2.4.RELEASE/org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:363) ~[spring-core-5.2.4.RELEASE.jar:na]
    at spring.core@5.2.4.RELEASE/org.springframework.cglib.proxy.Enhancer.generate(Enhancer.java:582) ~[spring-core-5.2.4.RELEASE.jar:na]
    at spring.core@5.2.4.RELEASE/org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:110) ~[spring-core-5.2.4.RELEASE.jar:na]
    at spring.core@5.2.4.RELEASE/org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:108) ~[spring-core-5.2.4.RELEASE.jar:na]
    at spring.core@5.2.4.RELEASE/org.springframework.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54) ~[spring-core-5.2.4.RELEASE.jar:na]
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na]
    at spring.core@5.2.4.RELEASE/org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61) ~[spring-core-5.2.4.RELEASE.jar:na]
    at spring.core@5.2.4.RELEASE/org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34) ~[spring-core-5.2.4.RELEASE.jar:na]
    at spring.core@5.2.4.RELEASE/org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:134) ~[spring-core-5.2.4.RELEASE.jar:na]
    at spring.core@5.2.4.RELEASE/org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:319) ~[spring-core-5.2.4.RELEASE.jar:na]
    at spring.core@5.2.4.RELEASE/org.springframework.cglib.proxy.Enhancer.createHelper(Enhancer.java:569) ~[spring-core-5.2.4.RELEASE.jar:na]
    at spring.core@5.2.4.RELEASE/org.springframework.cglib.proxy.Enhancer.createClass(Enhancer.java:416) ~[spring-core-5.2.4.RELEASE.jar:na]
    at spring.context@5.2.4.RELEASE/org.springframework.context.annotation.ConfigurationClassEnhancer.createClass(ConfigurationClassEnhancer.java:137) ~[spring-context-5.2.4.RELEASE.jar:na]
    at spring.context@5.2.4.RELEASE/org.springframework.context.annotation.ConfigurationClassEnhancer.enhance(ConfigurationClassEnhancer.java:109) ~[spring-context-5.2.4.RELEASE.jar:na]
    at spring.context@5.2.4.RELEASE/org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses(ConfigurationClassPostProcessor.java:423) ~[spring-context-5.2.4.RELEASE.jar:na]
    at spring.context@5.2.4.RELEASE/org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanFactory(ConfigurationClassPostProcessor.java:257) ~[spring-context-5.2.4.RELEASE.jar:na]
    at spring.context@5.2.4.RELEASE/org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:286) ~[spring-context-5.2.4.RELEASE.jar:na]
    at spring.context@5.2.4.RELEASE/org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:130) ~[spring-context-5.2.4.RELEASE.jar:na]
    at spring.context@5.2.4.RELEASE/org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:706) ~[spring-context-5.2.4.RELEASE.jar:na]
    at spring.context@5.2.4.RELEASE/org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:532) ~[spring-context-5.2.4.RELEASE.jar:na]
    at spring.boot@2.2.5.RELEASE/org.springframework.boot.web.reactive.context.ReactiveWebServerApplicationContext.refresh(ReactiveWebServerApplicationContext.java:66) ~[spring-boot-2.2.5.RELEASE.jar:na]
    at spring.boot@2.2.5.RELEASE/org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) ~[spring-boot-2.2.5.RELEASE.jar:na]
    at spring.boot@2.2.5.RELEASE/org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.2.5.RELEASE.jar:na]
    at spring.boot@2.2.5.RELEASE/org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.2.5.RELEASE.jar:na]
    at spring.boot@2.2.5.RELEASE/org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.2.5.RELEASE.jar:na]
    at spring.boot@2.2.5.RELEASE/org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) ~[spring-boot-2.2.5.RELEASE.jar:na]
    at my.somewhere@0.0.2/my.somewhere.MyApplication.main(MyApplication.java:11) ~[classes/:na]
Caused by: java.lang.IllegalAccessException: module my.somewhere does not open my.somewhere.abc to module spring.core
    at java.base/java.lang.invoke.MethodHandles.privateLookupIn(MethodHandles.java:202) ~[na:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
    at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
    at spring.core@5.2.4.RELEASE/org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:508) ~[spring-core-5.2.4.RELEASE.jar:na]
    ... 27 common frames omitted
spring-boot-maven-plugin java-11 spring-boot maven-3 intellij-idea
2 Answers

Because if you run it with mvn clean spring-boot:run all your classes and JARs are in the classpath not in the module-path.

So there is no module system when running it with the maven plugin or as executable JAR.

user_10451420

Putting open before your module declaration fixed it for me:

open module my.somewhere
{ 
    requires spring.core;
    requires spring.context;
    requires spring.boot;
    // and so on
}
user_179780660
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