validation-api-2.0.1.final.jar: What is it and Where to Download it
How to Download and Use validation-api-2.0.1.final.jar
If you are a Java developer and you want to use Bean Validation in your applications, you might need to download and use validation-api-2.0.1.final.jar. This is a JAR file that contains the Java API for Bean Validation, which is a standard for validating Java beans using annotations and constraints.
In this article, we will explain what validation-api-2.0.1.final.jar is, how to download it, and how to use it in your Java projects.
What is validation-api-2.0.1.final.jar?
validation-api-2.0.1.final.jar is a JAR file that contains the Java API for Bean Validation, which is defined by JSR 380, a specification of the Java platform.
What is Bean Validation?
Bean Validation or JSR 380 is a Java standard that is used to perform validation in Java applications. Validation is performed by applying constraints on data items, and as long as the data satisfies these constraints, it will be considered valid.
You can apply the built-in constraints as annotations in the fields of a Java class, such as @NotNull, @Min, @Max, @Email, etc. The Bean Validation model is supported by constraints in the form of annotations placed on a field, method, or class of a JavaBeans component, such as a managed bean.
What are the features of validation-api-2.0.1.final.jar?
validation-api-2.0.1.final.jar contains the following features:
How to download validation-api-2.0.1.final.jar from Maven Central Repository
Download validation-api-2.0.1.final.jar file for Bean Validation API
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It supports Java 8 and above features, such as stream and Optional improvements, modules, private interface methods, etc.
It supports validating container elements by annotating type arguments of parameterized types, such as List positiveNumbers.
It supports java.util.Optional and the new date/time data types for @Past and @Future.
It provides new built-in constraints, such as @Email, @NotEmpty, @NotBlank, @Positive, @PositiveOrZero, @Negative, @NegativeOrZero, @PastOrPresent and @FutureOrPresent.
It allows custom container types by plugging in additional value extractors.
How to download validation-api-2.0.1.final.jar?
You can download validation-api-2.0.1.final.jar from various sources on the web, such as [Java2s](^1^) or [Maven Repository]. You can also use a command line tool like wget or a web browser to download it.
How to use wget to download validation-api-2.0.1.final.jar?
wget is a free software package that can be used to retrieve files from the web. To use it, you need to have wget installed on your Linux system.
To download validation-api-2.0.1.final.jar using wget, you can use the following command:
This will download the zip file containing the JAR file to your current directory.
How to use a web browser to download validation-api-2.0.1.final.jar?
You can also use a web browser to download validation-api-2 0.1.final.jar using a web browser. To do this, you can follow these steps:
Open your web browser and go to the [Java2s] website.
Search for validation-api-2.0.1.final.jar in the search box and click on the result.
Click on the Download button and save the zip file to your desired location.
Extract the zip file to get the JAR file.
How to use validation-api-2.0.1.final.jar?
Once you have downloaded validation-api-2.0.1.final.jar, you can use it in your Java projects to perform Bean Validation. To do this, you need to have Java installed on your system and know how to open JAR files.
How to install Java on Windows?
If you don't have Java installed on your Windows system, you can follow these steps:
Go to the [Oracle] website and download the latest version of Java SE Development Kit (JDK).
Run the installer and follow the instructions to install Java on your system.
Set the JAVA_HOME environment variable to point to the installation directory of Java.
Add the bin directory of Java to the PATH environment variable.
How to open JAR files on Windows?
To open JAR files on Windows, you can use one of these methods:
Double-click on the JAR file and it will run automatically if you have Java installed and associated with JAR files.
Right-click on the JAR file and select Open with > Java(TM) Platform SE binary.
Open a command prompt and navigate to the directory where the JAR file is located. Then type java -jar validation-api-2.0.1.final.jar and press Enter.
How to use validation annotations in Java classes?
To use validation annotations in Java classes, you need to do the following:
Add validation-api-2.0.1.final.jar as a dependency to your project.
Annotate the fields of your Java class with the appropriate constraints, such as @NotNull, @Min, @Max, etc.
Create a Validator instance using the Validation class.
Use the validate method of the Validator instance to validate an object of your class.
Check the Set of ConstraintViolations returned by the validate method for any errors.
Here is an example of a Java class that uses validation annotations:
//import javax.validation packages import javax.validation.Validation; import javax.validation.Validator; import javax.validation.ValidatorFactory; import javax.validation.constraints.Email; import javax.validation.constraints.NotBlank; import javax.validation.constraints.Positive; //create a User class with validation annotations public class User //declare fields with constraints @NotBlank(message = "Name cannot be blank") private String name; @Email(message = "Email must be valid") private String email; @Positive(message = "Age must be positive") private int age; //create getters and setters public String getName() return name; public void setName(String name) this.name = name; public String getEmail() return email; public void setEmail(String email) this.email = email; public int getAge() return age; public void setAge(int age) this.age = age; //create a main class to test validation public class Main public static void main(String args) //create a User object with invalid data User user = new User(); user.setName(""); user.setEmail("abc@xyz"); user.setAge(-10); //create a Validator instance ValidatorFactory factory = Validation.buildDefaultValidatorFactory(); Validator validator = factory.getValidator(); //validate the User object Set> violations = validator.validate(user); //check for errors if (violations.isEmpty()) System.out.println("User is valid"); else System.out.println("User is invalid"); for (ConstraintViolation violation : violations) System.out.println(violation.getPropertyPath() + ": " + violation.getMessage());
The output of this program will be:
User is invalid name: Name cannot be blank email: Email must be valid age: Age must be positive
In this article, we have learned how to download and use validation-api-2.0.1.final.jar, which is a JAR file that contains the Java API for Bean Validation. We have also learned what Bean Validation is, what are the features of validation-api-2.0.1.final.jar, how to install Java on Windows, how to open JAR files on Windows, and how