nahuel92 / micronaut-test-bug

Micronaut Data/Test bugs PoC

Hi there! I noticed a couple of bugs related to Micronaut Data and/or Test involving the annotation @Transactional. I opened 2 bug reports (with one duplicated in a different repo since I'm not exactly sure where it belongs):

• Micronaut Data #2943.
• Micronaut Core #10813.
• Micronaut Test #1025 (duplicated from previous one).

Bug test cases

Annotation / Annotated on	Repository	Repository method	Tests execution result 1	Production execution result
@Transactional 2	Yes	No	Pass	Fail
@Transactional 2	No	Yes	Fail	Works well
@Transactional 2	Yes	Yes	Fail	Works well

More information

I did some debugging and I discovered that a TransactionalInterceptor is applied or not depending on where @Transactional is put (when @MockBean is used).

First bug test case

Debugger result

Autogenerated code

package org.nahuelrodriguez;

import io.micronaut.aop.Interceptor;
import io.micronaut.aop.InterceptorRegistry;
import io.micronaut.aop.Introduced;
import io.micronaut.context.BeanContext;
import io.micronaut.context.BeanResolutionContext;
import io.micronaut.context.Qualifier;
import io.micronaut.core.annotation.Generated;
import io.micronaut.data.jdbc.runtime.JdbcOperations;
import io.micronaut.inject.ExecutableMethod;

import java.util.List;

@Generated
class WorkingMicronautRepository$Intercepted extends WorkingMicronautRepository implements Introduced {
  private final Interceptor[][] $interceptors = new Interceptor[0][];
  private final ExecutableMethod[] $proxyMethods = new ExecutableMethod[0];

  public WorkingMicronautRepository$Intercepted(JdbcOperations var1, BeanResolutionContext var2, BeanContext var3, Qualifier var4, List var5, InterceptorRegistry var6) {
    super(var1);
  }
}

Previous autogenerated code will allow tests to pass, but it will make runtime execution to fail with io.micronaut.data.connection.exceptions.NoConnectionException: Expected an existing connection, but none was found.

Debugger result (with method annotated with @Transactional)

Autogenerated code

package org.nahuelrodriguez;

import io.micronaut.aop.Interceptor;
import io.micronaut.aop.InterceptorRegistry;
import io.micronaut.aop.Introduced;
import io.micronaut.aop.chain.InterceptorChain;
import io.micronaut.aop.chain.MethodInterceptorChain;
import io.micronaut.context.BeanContext;
import io.micronaut.context.BeanResolutionContext;
import io.micronaut.context.Qualifier;
import io.micronaut.core.annotation.Generated;
import io.micronaut.data.jdbc.runtime.JdbcOperations;
import io.micronaut.inject.ExecutableMethod;

import java.util.List;

@Generated
class WorkingMicronautRepository$Intercepted extends WorkingMicronautRepository implements Introduced {
  private final Interceptor[][] $interceptors = new Interceptor[1][];
  private final ExecutableMethod[] $proxyMethods = new ExecutableMethod[1];

  public List buggedMethod() {
    return (List) (new MethodInterceptorChain(this.$interceptors[0], this, this.$proxyMethods[0])).proceed();
  }

  public WorkingMicronautRepository$Intercepted(JdbcOperations var1, BeanResolutionContext var2, BeanContext var3, Qualifier var4, List var5, InterceptorRegistry var6) {
    super(var1);
    WorkingMicronautRepository.Intercepted.Definition.Exec var7 = new WorkingMicronautRepository.Intercepted.Definition.Exec(true);
    this.$proxyMethods[0] = var7.getExecutableMethodByIndex(0);
    this.$interceptors[0] = InterceptorChain.resolveAroundInterceptors(var6, this.$proxyMethods[0], var5);
  }
}

Second bug test case

Debugger result

Autogenerated code

package org.nahuelrodriguez;

import io.micronaut.aop.Interceptor;
import io.micronaut.aop.InterceptorRegistry;
import io.micronaut.aop.Introduced;
import io.micronaut.aop.chain.InterceptorChain;
import io.micronaut.aop.chain.MethodInterceptorChain;
import io.micronaut.context.BeanContext;
import io.micronaut.context.BeanResolutionContext;
import io.micronaut.context.Qualifier;
import io.micronaut.core.annotation.Generated;
import io.micronaut.inject.ExecutableMethod;

import java.util.List;

@Generated
class BuggedRepository$Intercepted extends BuggedRepository implements Introduced {
  private final Interceptor[][] $interceptors = new Interceptor[2][];
  private final ExecutableMethod[] $proxyMethods = new ExecutableMethod[2];

  public List buggedFetchMicronaut() {
    return (List) (new MethodInterceptorChain(this.$interceptors[0], this, this.$proxyMethods[0])).proceed();
  }

  public List buggedFetchJakarta() {
    return (List) (new MethodInterceptorChain(this.$interceptors[1], this, this.$proxyMethods[1])).proceed();
  }

  public BuggedRepository$Intercepted(BeanResolutionContext var1, BeanContext var2, Qualifier var3, List var4, InterceptorRegistry var5) {
    BuggedRepository.Intercepted.Definition.Exec var6 = new BuggedRepository.Intercepted.Definition.Exec(true);
    this.$proxyMethods[0] = var6.getExecutableMethodByIndex(0);
    this.$interceptors[0] = InterceptorChain.resolveAroundInterceptors(var5, this.$proxyMethods[0], var4);
    this.$proxyMethods[1] = var6.getExecutableMethodByIndex(1);
    this.$interceptors[1] = InterceptorChain.resolveAroundInterceptors(var5, this.$proxyMethods[1], var4);
  }
}

We can see how the constructor calls the resolveAroundInterceptors method.

Third bug test case

As it is a combination of previous 2 test cases, I haven't looked into it (I suspect it will be fixed once previous ones are fixed).

Application example

This application uses Java 21, Micronaut 4.4.2 (latest at the time of writing), Maven and Liquibase to simplify developers workflow.

How to test?

• You can go ahead and run all tests under src/test/java and you will see a couple of failing tests. This is the first bug test case.
• You can export MICRONAUT_ENVIRONMENTS=prod (see .env file) and run the application. This is the second test case.

Important: Second bug test case can't be caught during testing (at least, I couldn't figure out how to do so), which makes it quite concerning.

Footnotes

1. Tests mock repositories with @MockBean(RepositoryClass.class). ↩

2. It doesn't matter whether it's @jakarta.transaction.Transactional or @io.micronaut.transaction.annotation.Transactional. ↩ ↩² ↩³