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Monday, April 8, 2019

Spring MVC vs Spring Boot

On April 08, 2019 by Kamlesh   1 comment
What does spring framework do? Spring framework lets you develop java j2ee applications in a rapid easy way,Simple right. But the problem is setting up spring project manually as it involved lot of configurations. What does spring boot do? Spring boot aims to wrap all the spring components in a convenient way with no external xml configuration whatsoever. so basically spring boot lets you create...

Spring Security With Spring Boot Example

On April 08, 2019 by Kamlesh   1 comment
Before diving into this implementation, I would suggest you to look at Spring Security Introduction first. Let's Start Most of the Web Applications uses custom login page with custom authentication,So lets go with it.  <html>  <body>  <form method="post" action="/login">  ${sessionScope["SPRING_SECURITY_LAST_EXCEPTION"].message}          ...

What is Spring Security?

On April 08, 2019 by Kamlesh   1 comment
Spring Security provides comprehensive security services for J2EE-based enterprise software applications. As you probably know two major areas of application security are "authentication" and "authorization" (or "access-control"). These are the two main areas that Spring Security targets. "Authentication" is the process of establishing a principal is who they claim to be i.e authenticating the...

Adding your own implementation in JPA

On April 08, 2019 by Kamlesh   No comments
There might be a situation where you need to use your own method based on the requirement of a application. Spring Boot JPA provides not only CRUD Operations,if you extend JpaRepository, a whole lot of implementation will be available Some of them are shown below findByLastnameAndFirstname findByLastnameOrFirstname findByStartDateBetween findByAgeLessThan findByAgeLessThanEqual findByAgeGreaterThan findByAgeGreaterThanEqual findByStartDateAfter findByStartDateBefore findByAgeIsNull findByAge(Is)NotNull findByFirstnameLike findByFirstnameNotLike findByFirstnameStartingWith Before...

Crud Operations using Spring Data JPA

On April 08, 2019 by Kamlesh   No comments
Crud Operations using Spring Data JPA import org.springframework.data.repository.CrudRepository; public interface PersonDAO extends CrudRepository<Person, Long> { } Here PersonDAO Interface extends CrudRepository which contains crud operation methods and it accepts two generics, Person - bean which you want to persist(Bean name) Long - Type of primary key of the bean Person.(primary key...

What is Spring Boot JPA?

On April 08, 2019 by Kamlesh   No comments
Java Persistance API is a specification that provides an easy way of mapping from java object to relational mapping Why JPA? The java bean what we try to insert into database needs to be converted into single relational row that can fit into a table, This was all taken care by ORM's (Object - relational mapping), still the problem persists as the conversion had too much of boiler plate code,JDBC...

YAML and Application.Properties Configuration in Spring Boot

On April 08, 2019 by Kamlesh   No comments
One of the main reason of Spring boot huge success is AutoConfiguration, Developers were really exhausted by this xml configuration. In traditional spring mvc architecture if you wanted just to configure component scan and views, you had to write below shown snippet. <context:component-scan base-package="com.example.spring.dao"></context:component-scan> <context:component-scan base-package="com.example.spring.controllers"></context:component-scan> <context:component-scan...
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