What is the recommended code structure in Java for springboot based REST microservice?

What is the recommended code structure in Java for springboot based REST web service (microservice)? What I have seen in some java projects and also managed to deduce after searching on internet is below

ApplicationMainClass (hosting static void main())

<EntityA>
    <EntityA>.java
    <EntityA>Controller.java
    <EntityA>Service.java
    <EntityA>Repository.java

<EntityB>
    <EntityB>.java
    <EntityB>Controller.java
    <EntityB>Service.java
    <EntityB>Repository.java

pom.xml

etc

Q1. Is that how (i.e. above) the code in project should be structured or why not something like below as well

ApplicationMainClass (hosting static void main())

Entities
    <EntityA>.java
    <EntityB>.java
Controllers
    <EntityA>Controller.java
    <EntityB>Controller.java
Services
    <EntityA>Service.java
    <EntityB>Service.java
Respositories
    <EntityA>Repository.java
    <EntityB>Repository.java

pom.xml

Q2. Are there any other component/layer (i.e. apart from controller, Service, Respository) that should be in code structure?

Q3. Is their any best practices documentation or blog which I can refer so that I start with a meaningful code structure rather than starting with something which then have to be refactor-ed later.