Previously we have learnt how to do One To One and One To Many Mapping using Spring Data JPA, in this article, we will learn about Spring Data JPA Many to Many mapping. Let's take the Example of Employee and Address, one Employee can have many Address and similarly, one Address can have many Employees. Let's dig into the code. … [Read more...]
Spring Data JPA One To Many Foreign Key Example
In this Spring Data JPA One To Many article, we will learn how to achieve One To Many Mapping using Spring Data JPA. In this approach, we will re-use the same two tables which we used in our previous Spring Data JPA One To One Example. … [Read more...]
Spring CRUD Example with JdbcTemplate + Maven + Oracle
In this Spring CRUD Example, we will build a Simple Spring Application and perform CRUD operations using Spring JdbcTemplate. We will create a simple Employee management application which has abilities to create a new employee, update the existing employee, get a particular employee/ all employee and finally delete the existing employee. … [Read more...]
Spring JdbcTemplate Example + JdbcDaoSupport
Spring framework provides excellent support to JDBC, it provides a super powerful utility class called "JdbcTemplate" which helps us avoid boiler-plate code from our database operations such as Creating Connection, Statement, Closing the Resultset and Connection, Exception handling, Transaction management etc. In this Spring JdbcTemplate Example, let's understand how … [Read more...]
Spring PropertyPlaceholderConfigurer Example – Reading a Property File
It’s never a good practice to hard code and combine any environment related details such a username, password or file path etc. along with spring bean configuration. Usually in Java we will be having those details written in a separate property file and it will be read during the execution, the same can be followed in the spring as well using … [Read more...]
Spring Bean Creation – Static Factory Method & Instance Factory Method
In Spring we can create bean using Spring FactoryBean, FactoryBean is an interface and we need to give implementations for the methods in it. If you don't want to go by that methodology but still want Java Factory Pattern to be implemented then we can go for Static Factory Method and Instance Factory Method. The client who requests for an object can simply make a call to … [Read more...]
Spring Bean Life Cycle – Bean Initialization and Destruction
Spring IoC container is also responsible for managing the Spring Bean Life Cycle, the life cycle of beans consist of call back methods such as Post initialization call back method and Pre destruction call back method. Below steps are followed by Spring IoC Container to manage bean life cycle. Spring Bean Life Cycle Creation of bean instance by a factory method. Set the … [Read more...]
Spring Autowiring using Annotation – @Autowired, @Resource, @Qualifier, @Inject Annotation
Spring Autowiring by using the "autowire" attribute in the bean configuration file we can wire all the properties of the bean class. Using Spring Autowiring through XML you cannot wire a particular property. In those cases we can use the Spring @Autowired annotation which allows auto-wiring of setter method, a constructor, a field, or even an arbitrary method. … [Read more...]
Spring Dependency Checking and Spring @Required Annotation
For a large-scale application, there can be hundreds of bean declared in the Spring IoC container and managing dependency between them will be already complicated. Especially through Setter Injection, we cannot make sure that values for all the properties has been injected. Spring dependency checking feature will come into rescue in this situation which helps us to check if … [Read more...]
How to create Spring Beans Using Spring FactoryBean
In Spring you can also Create and Configure of Spring Bean using Spring's FactoryBean . A factory bean in Spring serves as a factory for creating other beans within the Spring IoC container. In Java terms we can say that, a factory bean is very similar to a factory method (Java Factory Pattern), but here it is Spring specific bean which can be identified by the Spring IoC … [Read more...]
How to specify Spring Bean Reference and Spring Inner Bean
If you are using Setter Injection or Constructor Injection to inject a simple data type then we will be using the <value> tag in the bean configuration file to inject. Whereas when we want to refer another bean then we have to use <ref> tag. Lets see how we can refer another bean in this Spring bean reference example. … [Read more...]
Spring Constructor Injection – Resolving Ambiguity
In Spring Constructor Injection we will be injecting values to the property using the Constructor available. Whenever you specify the class attribute for a bean, then you are implicitly asking the Spring IoC container to create the bean instance by invoking its constructor. … [Read more...]