When I use @SpringBootTest it throws No Session found for current thread

### Expected Behavior

I have 2 automated tests, one functional and one for integration. The functional test has the annotation '@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.DEFINED_PORT)'.
When I run the command grails test-app the first test works the second the exception below is thrown.

If you remove the SpringBootTest annotation the 'test-app' command works.

`java.lang.IllegalStateException: Failed to load ApplicationContext
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:132)
at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:124)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:118)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:83)
at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:248)
at org.spockframework.spring.SpringTestContextManager.prepareTestInstance(SpringTestContextManager.java:56)
at org.spockframework.spring.SpringInterceptor.interceptInitializerMethod(SpringInterceptor.java:46)
at org.spockframework.runtime.extension.AbstractMethodInterceptor.intercept(AbstractMethodInterceptor.java:24)
at org.spockframework.runtime.extension.MethodInvocation.proceed(MethodInvocation.java:101)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$prepare$2(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.prepare(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:90)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:41)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:155)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141)
at org.spockframework.runtime.model.MethodInfo.invoke(MethodInfo.java:148)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:41)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:155)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:35)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:54)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:107)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:88)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute$0(EngineExecutionOrchestrator.java:54)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams(EngineExecutionOrchestrator.java:67)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:52)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:114)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:86)
at org.junit.platform.launcher.core.DefaultLauncherSession$DelegatingLauncher.execute(DefaultLauncherSession.java:86)
at org.junit.platform.launcher.core.SessionPerRequestLauncher.execute(SessionPerRequestLauncher.java:53)
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$000(JUnitPlatformTestClassProcessor.java:79)
at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor.stop(JUnitPlatformTestClassProcessor.java:75)
at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.stop(SuiteTestClassProcessor.java:61)
at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
at org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:33)
at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:94)
at org.gradle.api.internal.tasks.testing.worker.TestWorker$3.run(TestWorker.java:193)
at org.gradle.api.internal.tasks.testing.worker.TestWorker.executeAndMaintainThreadName(TestWorker.java:129)
at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:100)
at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:60)
at org.gradle.process.internal.worker.child.ActionExecutionWorker.execute(ActionExecutionWorker.java:56)
at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:133)
at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:71)
at worker.org.gradle.process.internal.worker.GradleWorkerMain.run(GradleWorkerMain.java:69)
at worker.org.gradle.process.internal.worker.GradleWorkerMain.main(GradleWorkerMain.java:74)
Caused by: org.hibernate.HibernateException: No Session found for current thread
at app//org.grails.orm.hibernate.GrailsSessionContext.currentSession(GrailsSessionContext.java:112)
at app//org.hibernate.internal.SessionFactoryImpl.getCurrentSession(SessionFactoryImpl.java:508)
at app//org.grails.orm.hibernate.HibernateSession.createQuery(HibernateSession.java:185)
at app//org.grails.orm.hibernate.HibernateSession.createQuery(HibernateSession.java:178)
at app//org.grails.datastore.gorm.finders.AbstractFindByFinder.buildQuery(AbstractFindByFinder.java:44)
at app//org.grails.datastore.gorm.finders.AbstractFindByFinder$1.doInSession(AbstractFindByFinder.java:29)
at app//org.grails.datastore.mapping.core.DatastoreUtils.execute(DatastoreUtils.java:319)
at app//org.grails.datastore.gorm.finders.AbstractFinder.execute(AbstractFinder.java:42)
at app//org.grails.datastore.gorm.finders.AbstractFindByFinder.doInvokeInternal(AbstractFindByFinder.java:27)
at app//org.grails.datastore.gorm.finders.DynamicFinder.invoke(DynamicFinder.java:254)
at app//org.grails.datastore.gorm.finders.DynamicFinder.invoke(DynamicFinder.java:392)
at org.grails.datastore.gorm.GormStaticApi.methodMissing_closure2(GormStaticApi.groovy:182)
at app//groovy.lang.Closure.call(Closure.java:412)
at app//com.fernando.BootStrap.$tt__config(BootStrap.groovy:10)
at com.fernando.BootStrap.config_closure3(BootStrap.groovy)
at app//groovy.lang.Closure.call(Closure.java:412)
at app//groovy.lang.Closure.call(Closure.java:428)
at app//grails.gorm.transactions.GrailsTransactionTemplate$2.doInTransaction(GrailsTransactionTemplate.groovy:94)
at app//org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:140)
at app//grails.gorm.transactions.GrailsTransactionTemplate.execute(GrailsTransactionTemplate.groovy:91)
at app//com.fernando.BootStrap$_closure1.doCall(BootStrap.groovy:19)
at app//groovy.lang.Closure.call(Closure.java:412)
at app//groovy.lang.Closure.call(Closure.java:406)
at app//grails.util.Environment.evaluateEnvironmentSpecificBlock(Environment.groovy:585)
at app//grails.util.Environment.executeForEnvironment(Environment.groovy:578)
at app//grails.util.Environment.executeForCurrentEnvironment(Environment.groovy:554)
at app//org.grails.web.servlet.boostrap.DefaultGrailsBootstrapClass.callInit(DefaultGrailsBootstrapClass.java:74)
at app//org.grails.web.servlet.context.GrailsConfigUtils.executeGrailsBootstraps(GrailsConfigUtils.java:83)
at app//org.grails.plugins.web.servlet.context.BootStrapClassRunner.onStartup(BootStrapClassRunner.groovy:56)
at app//grails.boot.config.GrailsApplicationPostProcessor.onApplicationEvent(GrailsApplicationPostProcessor.groovy:269)
at app//org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:176)
at app//org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:169)
at app//org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:143)
at app//org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:421)
at app//org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:378)
at app//org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:938)
at app//org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:586)
at app//org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:147)
at app//org.springframework.boot.SpringApplication.refresh(SpringApplication.java:734)
at app//org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:408)
at app//org.springframework.boot.SpringApplication.run(SpringApplication.java:308)
at app//grails.boot.GrailsApp.run(GrailsApp.groovy:99)
at app//org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:132)
at app//org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:99)
at app//org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124)
... 61 more
`

### Actual Behaviour

An exception is thrown

### Steps To Reproduce

git clone https://github.com/fernando88to/TesteApp.git
cd TesteApp
./grailsw test-app

### Environment Information

- Grails Version: 5.2.0
- openjdk version "11.0.11" 2021-04-20
- Manjaro (Linux)

### Example Application

https://github.com/fernando88to/TesteApp

### Version

5.2.0

Start with BootStrap.groovy at the stack-trace locations around lines 10 and 19, then reproduce the failure with grails test-app and the @SpringBootTest test. Compare the run with and without SpringBootTest, and use the reported session error to define a passing integration-test startup.

Written by the indexing model from the issue text.