I have this simple post request:

@PostMapping
public <T> void create(T data) {
    System.out.println(data);
}

Whenever I call this request (providing any data type in the form-data like a string or a number), it prints this in the console:

java.lang.Object@46093a82

it doesn't give any error, just printing this object instead of "name" for example.

What's the problem?

CodePudding user response：

java.lang.Object@46093a82 is printed, because that's what needs to be printed.
All Java objects have a toString() method (This method is defined in the Object class), which is invoked when you try to print the object.
The Object.toString() method returns a string, composed of the name of the class, an @ symbol and the hashcode of the object in hexadecimal.
To print something different when you call System.out.println(Object), you must override the toString() method in your own class.
simple example:

 public class Foo {

  private String name;

  @Override
  public String toString() {
    return name;
  }
}