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
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
Plain Old Java Object The name is used to emphasize that a given object is an ordinary Java Object, not a special object such as those defined by the EJB 2 framework. class A {} class B extends/implements C {} Note: B is non POJO when C is kind of distributed framework class or ifc. … Read more
Prefer JavaBeans When you have to interact with environments that expect them you have lots of properties for which it would be inconvenient to do all initialization on instantiation you have state that is expensive or impossible to copy for some reason but requires mutation you think at some point you may have to change … Read more
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
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
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
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
Since Jackson v2.0, you can use @JsonFormat annotation directly on Object members; @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = “yyyy-MM-dd HH:mm a z”) private Date date;
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