Document function dependency injection

I’ve created a Micronaut function:

mn create-function-app demo --features aws-lambda --test spock --jdk 11

Without modifying anything it is possible to deploy the current code on AWS Lambda and call the function. Package with ./gradlew shadowJar, create the AWS Lambda function and set the handler to demo.BookRequestHandler:

Now, I’ve created a service:

@Singleton
public class HelloService {

    public String hello() {
        return "Hello World!";
    }
}

And modified the provided BookRequestHandler class

//@Introspected
@Singleton
public class BookRequestHandler extends MicronautRequestHandler<Book, BookSaved> {

    @Inject
    HelloService helloService;

    @Override
    public BookSaved execute(Book input) {
        BookSaved bookSaved = new BookSaved();
        bookSaved.setName(helloService.hello());
//        bookSaved.setName(input.getName());
        bookSaved.setIsbn(UUID.randomUUID().toString());
        return bookSaved;
    }
}

When deploying again the app in AWS Lambda and sending the same request as before, it now fails:

I’ve discovered that it also fails just running the test (that works with the provided code)

Steps to Reproduce

• git clone https://github.com/micronaut-core-issues-test-app/function-dependency-injection
• cd function-dependency-injection
• ./gradlew check

The test fails

Expected Behaviour

The test should pass

Actual Behaviour

The test fails:

12:48:53.520 [Test worker] INFO  i.m.context.env.DefaultEnvironment - Established active environments: [function, lambda]

Bean definition [demo.BookRequestHandler] could not be loaded: failed to access class io.micronaut.function.executor.AbstractExecutor from class demo.$BookRequestHandlerDefinition (io.micronaut.function.executor.AbstractExecutor and demo.$BookRequestHandlerDefinition are in unnamed module of loader 'app')
io.micronaut.context.exceptions.BeanInstantiationException: Bean definition [demo.BookRequestHandler] could not be loaded: failed to access class io.micronaut.function.executor.AbstractExecutor from class demo.$BookRequestHandlerDefinition (io.micronaut.function.executor.AbstractExecutor and demo.$BookRequestHandlerDefinition are in unnamed module of loader 'app')
	at io.micronaut.context.DefaultBeanContext.initializeContext(DefaultBeanContext.java:1535)
	at io.micronaut.context.DefaultApplicationContext.initializeContext(DefaultApplicationContext.java:220)
	at io.micronaut.context.DefaultBeanContext.readAllBeanDefinitionClasses(DefaultBeanContext.java:2780)
	at io.micronaut.context.DefaultBeanContext.start(DefaultBeanContext.java:233)
	at io.micronaut.context.DefaultApplicationContext.start(DefaultApplicationContext.java:166)
	at io.micronaut.function.executor.AbstractExecutor.startEnvironment(AbstractExecutor.java:125)
	at io.micronaut.function.aws.MicronautRequestHandler.buildApplicationContext(MicronautRequestHandler.java:85)
	at io.micronaut.function.aws.MicronautRequestHandler.<init>(MicronautRequestHandler.java:48)
	at demo.BookRequestHandler.<init>(BookRequestHandler.java:11)
	at demo.BookRequestHandlerTest.setupServer(BookRequestHandlerTest.java:14)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:688)
	at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
	at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)
	at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:149)
	at org.junit.jupiter.engine.extension.TimeoutExtension.interceptLifecycleMethod(TimeoutExtension.java:126)
	at org.junit.jupiter.engine.extension.TimeoutExtension.interceptBeforeAllMethod(TimeoutExtension.java:68)
	at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(ExecutableInvoker.java:115)
	at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(ExecutableInvoker.java:105)
	at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106)
	at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64)
	at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45)
	at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37)
	at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104)
	at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:98)
	at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$invokeBeforeAllMethods$9(ClassBasedTestDescriptor.java:384)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.invokeBeforeAllMethods(ClassBasedTestDescriptor.java:382)
	at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.before(ClassBasedTestDescriptor.java:196)
	at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.before(ClassBasedTestDescriptor.java:78)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:136)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
	at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
	at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
	at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
	at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
	at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
	at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:248)
	at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$5(DefaultLauncher.java:211)
	at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:226)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:199)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:132)
	at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor$CollectAllTestClassesExecutor.processAllTestClasses(JUnitPlatformTestClassProcessor.java:99)
	at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor$CollectAllTestClassesExecutor.access$000(JUnitPlatformTestClassProcessor.java:79)
	at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor.stop(JUnitPlatformTestClassProcessor.java:75)
	at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.stop(SuiteTestClassProcessor.java:61)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
	at org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:33)
	at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:94)
	at com.sun.proxy.$Proxy2.stop(Unknown Source)
	at org.gradle.api.internal.tasks.testing.worker.TestWorker.stop(TestWorker.java:133)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
	at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:182)
	at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:164)
	at org.gradle.internal.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:414)
	at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
	at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:56)
	at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.IllegalAccessError: failed to access class io.micronaut.function.executor.AbstractExecutor from class demo.$BookRequestHandlerDefinition (io.micronaut.function.executor.AbstractExecutor and demo.$BookRequestHandlerDefinition are in unnamed module of loader 'app')
	at demo.$BookRequestHandlerDefinition.<init>(Unknown Source)
	at demo.$BookRequestHandlerDefinition.<init>(Unknown Source)
	at demo.$BookRequestHandlerDefinitionClass.load(Unknown Source)
	at io.micronaut.context.AbstractBeanDefinitionReference.load(AbstractBeanDefinitionReference.java:62)
	at io.micronaut.context.DefaultBeanContext.loadContextScopeBean(DefaultBeanContext.java:2158)
	at io.micronaut.context.DefaultBeanContext.initializeContext(DefaultBeanContext.java:1533)
	... 87 more

BookRequestHandlerTest > initializationError FAILED
    io.micronaut.context.exceptions.BeanInstantiationException at BookRequestHandlerTest.java:14
        Caused by: java.lang.IllegalAccessError at BookRequestHandlerTest.java:14
1 test completed, 1 failed

More info

This issues seems similar (although not exactly the same) to https://github.com/micronaut-projects/micronaut-core/issues/2789 that was fixed in Micronaut 1.3.1.

Environment Information

• Operating System: Linux
• Micronaut Version: 2.1.0
• JDK Version: 11 Corretto

Example Application

https://github.com/micronaut-core-issues-test-app/function-dependency-injection

[sdelamo]

@ilopmar I think the issue is you need to specify

shadowJar {
    mergeServiceFiles()
}

https://github.com/micronaut-core-issues-test-app/mn-aws-function-error/pull/1

DI will work once you deploy with that change.

[graemerocher]

@jameskleeh it is, but as part of the application plugin not the library plugin, it seems maybe it needs applying to both.