For fields with constraints, such as @NonNull fields, no check is generated,so be aware that these constraints will generally not be fulfilled until those fields are properly initialized later. Certain java constructs, such as hibernate and the Service Provider Interface require a no-args constructor .
Read moreWhat will happen if we dont have no-arg constructor in Entity Bean?
If you don’t define any constructors, the compiler will generate the default one , as described in the JLS: If a class contains no constructor declarations, then a default constructor with no formal parameters and no throws clause is implicitly declared.
Read moreDo all classes have a no-arg constructor?
All classes have at least one constructor . If a class does not explicitly declare any, the Java compiler automatically provides a no-argument constructor, called the default constructor.
Read moreWhat is no-arg constructor in Java?
No-Arg Constructor – a constructor that does not accept any arguments . Parameterized constructor – a constructor that accepts arguments. Default Constructor – a constructor that is automatically created by the Java compiler if it is not explicitly defined.
Read moreDo you need a no-arg constructor?
No-argument constructor A constructor that has no parameter is known as the default constructor. If we don’t define a constructor in a class, then the compiler creates a default constructor(with no arguments) for the class .
Read moreWhy do we need no arg constructor?
The arguments of a constructor can only be found by type, not by name, so there is no way for the framework to reliably match properties to constructor args . Therefore, they require a no-arg constructor to create the object, then can use the setter methods to initialise the data.
Read moreWhat is a constructor with no argument?
A constructor that takes no parameters is called a parameterless constructor . Parameterless constructors are invoked whenever an object is instantiated by using the new operator and no arguments are provided to new .
Read more