How to test controller action in Grails 3.3.6 without using services - testing

Question

I have created Grails Application with one domain and controller. In development environment i have inserted two entry for domain.I want to perform integration testing such that it fetch records from the database and return the total size.Below is my source code which i tried.
Below is my domain
Student.groovy.
import grails.gorm.transactions.Transactional
#Transactional
class Student {
String name
String rollnumber
static constraints = {
}
}
Below is my controller:-
import grails.gorm.transactions.Transactional
#Transactional
class StudentController {
def readall(){
println "inside read all "+Student.getAll().size()
respond Student.getAll()
}
}
Below is my Integration Testing code:
import grails.testing.gorm.DomainUnitTest
import grails.testing.mixin.integration.Integration
import grails.testing.web.controllers.ControllerUnitTest
import grails.validation.ValidationException
import spock.lang.Specification
#Integration
class StudentControllerSpec extends Specification implements ControllerUnitTest<StudentController>, DomainUnitTest<Student> {
void "getAllStudentList"(){
given:
def studentList=[]
when:
request.method = 'GET'
controller.readall()
println studentList.size()
then:
studentList.size()==1
}
}
Below is my application.yml file
---
hibernate:
cache:
queries: false
use_second_level_cache: false
use_query_cache: false
dataSource:
pooled: true
jmxExport: true
driverClassName: org.h2.Driver
username: sa
password: ''
environments:
development:
dataSource:
dbCreate: create-drop
url: jdbc:h2:mem:devDb;MVCC=TRUE;LOCK_TIMEOUT=10000;DB_CLOSE_ON_EXIT=FALSE
test:
dataSource:
dbCreate: update
url: jdbc:h2:mem:testDb;MVCC=TRUE;LOCK_TIMEOUT=10000;DB_CLOSE_ON_EXIT=FALSE
production:
dataSource:
dbCreate: none
url: jdbc:h2:./prodDb;MVCC=TRUE;LOCK_TIMEOUT=10000;DB_CLOSE_ON_EXIT=FALSE
properties:
jmxEnabled: true
initialSize: 5
maxActive: 50
minIdle: 5
maxIdle: 25
maxWait: 10000
maxAge: 600000
timeBetweenEvictionRunsMillis: 5000
minEvictableIdleTimeMillis: 60000
validationQuery: SELECT 1
validationQueryTimeout: 3
validationInterval: 15000
testOnBorrow: true
testWhileIdle: true
testOnReturn: false
jdbcInterceptors: ConnectionState
defaultTransactionIsolation: 2 # TRANSACTION_READ_COMMITTED
i'm getting below exception while running test case
Configuring Spring Security Core ...
... finished configuring Spring Security Core
2019-04-21 16:05:07.979 ERROR --- [ Test worker] o.s.boot.SpringApplication : Application startup failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'methodValidationPostProcessor' defined in class path resource [org/springframework/boot/autoconfigure/validation/ValidationAutoConfiguration.class]: Unsatisfied dependency expressed through method 'methodValidationPostProcessor' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'hibernateDatastoreServiceRegistry': Cannot resolve reference to bean 'hibernateDatastore' while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'hibernateDatastore': Bean instantiation via constructor failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.grails.orm.hibernate.HibernateDatastore]: Constructor threw exception; nested exception is org.hibernate.MappingException: Could not determine type for: org.springframework.transaction.PlatformTransactionManager, at table: student, for columns: [org.hibernate.mapping.Column(transaction_manager)]
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:749)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:467)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1181)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1075)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:312)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:308)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
at org.springframework.context.support.PostProcessorRegistrationDelegate.registerBeanPostProcessors(PostProcessorRegistrationDelegate.java:225)
at org.springframework.context.support.AbstractApplicationContext.registerBeanPostProcessors(AbstractApplicationContext.java:703)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:528)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693)

Answer 1

Remove #Transactional from your domain class. #Transactional are used to begin transactions on services/controllers - but it does not make sense in a domain class.
The error is GORM is trying to create a column of transaction_manager because #Transactional adds a property of transactionManger to the class and is of a type that doesn't make sense to hibernate.