If the instruction @Transactional(readOnly = true) is causing the bellow error(s):
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'xxx' defined in class path resource \[xxx/xxx.xml\]: Initialization of bean failed; nested exception is org.springframework.aop.framework.AopConfigException: Cannot proxy target class because CGLIB2 is not available. Add CGLIB to the class path or specify proxy interfaces.
Caused by: org.springframework.aop.framework.AopConfigException: Cannot proxy target class because CGLIB2 is not available. Add CGLIB to the class path or specify proxy interfaces.
Add the cglib jar or maven dependency to your project:
<dependency>
<groupid>cglib</groupid>
<artifactid>cglib</artifactid>
<version>2.2</version>
</dependency>