Play with CMD

dir | clip  // copy to clip board
type error.log | clip

echo hello > a.txt     // overrite file

echo hello >> a.txt  // append  file

doskey /HISTORY > history.txt  // copy all commands

MyCommand.exe 1>stdout.txt 2>errors.txt



Copy & Paste a command session as follows:

1.) At the end of your session, click the upper left corner to display the menu.
Then select.. Edit -> Select all

2.) Again, click the upper left corner to display the menu.
Then select.. Edit -> Copy

3.) Open your favorite text editor and use Ctrl+V or your normal

Paste operation to paste in the text.

mod con lines=32766

@echo off

cmd "mode con:cols=140 lines=2500"

@echo off
echo test!
pause

exit


You'll have to kill the program using Ctrl + C where C stands for Cancel.

Spring Rest API Validation

https://jcp.org/en/jsr/detail?id=303

 @NotBlank(message = "username can't empty!")
    String username;

 @NotBlank

    @Size(min = 3, max = 50)

    private String username;

@NotEmpty

    @Length(max = 140)

    private String text;

ConstraintComposition	Boolean operator that is applied to all constraints of a composing constraint annotation.
CreditCardNumber	The annotated element has to represent a valid credit card number.
CreditCardNumber.List	Defines several @CreditCardNumber annotations on the same element.
Email	The string has to be a well-formed email address.
Email.List	Defines several @Email annotations on the same element.
Length	Validate that the string is between min and max included.
Length.List	Defines several @Length annotations on the same element.
NotBlank	Validate that the annotated string is not null or empty.
NotBlank.List	Defines several @NotBlank annotations on the same element.
NotEmpty	Asserts that the annotated string, collection, map or array is not null or empty.
NotEmpty.List	Defines several @NotEmpty annotations on the same element.
Range	The annotated element has to be in the appropriate range.
Range.List	Defines several @Range annotations on the same element.
SafeHtml	Validate a rich text value provided by the user to ensure that it contains no malicious code, such as embedded

Spring Annotation

Class level annotation
method level  annoation
property level annotation

@Autowired by default use by type

xyz.MyBean
abc.MyBean

resolve that conflict dependency issue using @Qualifier  annotation

@Resource

@Inject

@component scan base package

Spring Annotation