How to convert POJO to JSON and vice versa?

Take a look at https://www.json.org Imagine that you have a simple Java class like this: public class Person { private String name; private Integer age; public String getName() { return this.name; } public void setName( String name ) { this.name = name; } public Integer getAge() { return this.age; } public void setAge( Integer age … Read more

How to create a POJO?

A POJO is just a plain, old Java Bean with the restrictions removed. Java Beans must meet the following requirements: Default no-arg constructor Follow the Bean convention of getFoo (or isFoo for booleans) and setFoo methods for a mutable attribute named foo; leave off the setFoo if foo is immutable. Must implement java.io.Serializable POJO does … Read more

IntelliJ IDEA 10 generate entity (POJO) from DB model

UPDATE: In IntelliJ 16 this feature in now implemented. The steps to do it are: Database view context menu Scripted Extensions Generate POJOs You can read more here: Feature request: allow “generate classes from database schema” for plain-JDBC developers Note: The following information is about version 15 and earlier: First, you need to tell IntelliJ … Read more

What is java pojo class, java bean, normal class? [duplicate]

Normal Class: A Java class Java Beans: All properties private (use getters/setters) A public no-argument constructor Implements Serializable. Pojo: Plain Old Java Object is a Java object not bound by any restriction other than those forced by the Java Language Specification. I.e., a POJO should not have to Extend prespecified classes Implement prespecified interface Contain … Read more

Spring Data JPA map the native query result to Non-Entity POJO

I think the easiest way to do that is to use so called projection. It can map query results to interfaces. Using SqlResultSetMapping is inconvienient and makes your code ugly :). An example right from spring data JPA source code: public interface UserRepository extends JpaRepository<User, Integer> { @Query(value = “SELECT firstname, lastname FROM SD_User WHERE … Read more

What is the difference between field, variable, attribute, and property in Java POJOs?

From here: http://docs.oracle.com/javase/tutorial/information/glossary.html field A data member of a class. Unless specified otherwise, a field is not static. property Characteristics of an object that users can set, such as the color of a window. attribute Not listed in the above glossary variable An item of data named by an identifier. Each variable has a type, … Read more

What is the difference between a JavaBean and a POJO?

A JavaBean follows certain conventions. Getter/setter naming, having a public default constructor, being serialisable etc. See JavaBeans Conventions for more details. A POJO (plain-old-Java-object) isn’t rigorously defined. It’s a Java object that doesn’t have a requirement to implement a particular interface or derive from a particular base class, or make use of particular annotations in … Read more

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