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One of the most important annotations in spring is @Value annotation which is used to assign default values to variables and method arguments. We can read spring environment variables as well as system variables using @Value annotation. It also supports Spring Expression Language (SpEL). It is generally used for injecting values into configuration variables, which we will show and explain in the following example. 

Implementation: Project

Prerequisites :  Spring – Injecting Literal Values By Setter Injection Spring – How to Load Literal Values from Properties File

Step 1: First, let’s create a simple Spring Application and inject the literal values by setter injection. So, create a simple class Student having three attributes rollNo, name, and age. Create setter methods for these two attributes and a simple method to print the details of the student.

File: Student.java

   

Step 2:  Let’s create a properties file in your classpath and name the file as student-info.properties (for this example we name it like this, you can name it according to your need). And in this file, we are going to write something like as follows: 

Step 3: Now let’s create a Student Bean in the beans.xml file and inside the bean, you have to add your property’s name and its corresponding values inside the <property> tag. For example, for this project, we can write something like this

File: beans.xml

Step 4: So now our bean is ready. Now let’s create a class and define the main() method inside that class. Suppose we have created a class named Main and we have defined the main() method inside this class. 

File: Main.java

Step 5: Now run your main() method and the output will be like this.

Code Explanation: So the application is working fine. Now come to the beans.xml file again. And in this file, we don’t want to set value like this as we have done. We want to use some annotation for doing the same thing. And here @Value Annotation comes into the picture. So we can modify our Student.java file something like this

Step 6: dd the following line inside your beans.xml file

Step 7: Run your main() method and the output will be like this.

Note: Or you can also set the values dynamically from the properties file. We can modify our Student.java file something like this
Tip: Don’t forget to add the below line inside your beans.xml file

File: beans.xml 

Run your main() method and the output will be like this.

Now let’s discuss one more interesting concept on Spring @Value Annotation. We can also use the @Value annotation before the fields. There is no need to create the setter method. We can modify our Student.java file something like this

All other things should be unchanged. Run your main() method again and the output will be like this.

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A guide to @Value in Spring Boot

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The @Value annotation is the quickest way to access the application.properties values in Spring Boot. It comes with some powerful features which we will explore in this tutorial.

@Value Annotation in Spring Boot

The @value annotation is the easiest way to inject values into primitive fields. To demo this, let’s set up an application with some sample property values.

We can access all of these properties values in our spring boot application as shown below.

As you can see, we can create as many fields as we go. Even though field injection is usually not recommended, This approach is an easy fix.

Advanced usages of @Value annotation

Even though the above approach would be sufficient, you can also use @Value annotation in the following use cases.

Property values as arrays

If you have defined a comma-separated list of values, you can @Value them into an array.

The same works for collections as well. For example, you can assign the values from the properties file into a List or Set . Spring Boot @Value annotation will take care of the injection for you.

Note that the Set and Collection behave the same way (remove duplicates in the list of values).

Property values with time units and durations

You could also read values directly into Duration . For instance, take a look at this property entry.

If you define the @Value annotation for a Duration field, Spring will inject an appropriate value.

Reading properties values as ENUM

If the value matches the ENUM.name(), then you can directly assign the values into appropriate fields.

For example, if you have an enum like below, then you could directly read values as ENUMs.

With the above property value, you can access the results as shown here.

This approach is useful when you expect only a certain set of values for that field. Also, This approach works with the arrays of enums as well.

Spring Boot @Value with Default values

With all the above implementations, if you fail to provide an entry in the application.properties file, then you would get a “ Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder ‘XXX’ in value “${XXX}” “.

Spring boot @Value Cannot resolve placeholder

To avoid this, you should always provide a default value when possible. To do that, you need to write the annotation in a slightly different way.

For example, if you expect a default greeting message, then you can do as shown here.

In this case, if the “ greeting.message ” is not available in the application.properties or any other properties source, then Spring will use the fallback value “ Hello World ” instead.

Advanced use cases with @Value and SpEL

So far every example used a ${…} pattern in the @Value annotations. These are called SpEL(Spring Expression Language) expressions. Now we are going to look at some advanced usages in conjunction with SpEL.

Injecting maps

With the help of Key-value parsing from SpEL, You can define a Map in one of the properties keys and use inject them like this.

And you can read these values in to map using @Value annotation like this.

Note that the expression here is at two levels. The inner level gets a string value from the property. That is then parsed by the # operator into a map.

Accessing Beans

You could call bean methods within the @Value expression through SpEL.

This way, You could call other beans or bean.fields to populate values. For this to work, The other bean must be initialized.

@Value with Constructor injection in Spring boot

Spring boot allows @Value annotation in their constructor injection as well. For example, if you need to use values from the application.properties into a constructor, then you can use @Value annotation against the constructor parameter.

This approach allows the value to be set through a constructor. Also, you don’t need to use @Autowired with Spring 5.

We learned how to use @Value annotation in various ways. If you liked this tutorial You might also find the below topics relevant.

  • Enums in Thymeleaf templates
  • Setter Dependency Injection in Spring Framework
  • Spring Boot Annotations | Beginners guide
  • Constructor dependency injection in Spring Framework
  • Send firebase push notifications From Spring Boot

You could also find various examples at https://github.com/springhow .

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The @Value Annotation in Spring

resource value annotation

  • Introduction

The main focus of this article is to help you understand how Spring's @Value annotation works.

@Value is a Java annotation that is used at the field or method/constructor parameter level and it indicates a default value for the affected argument. It is commonly used for injecting values into configuration variables - which we will show and explain in the next part of the article.

  • Basic Assignment

For the easiest examples, we will assign values to three different fields using the @Value annotation by giving them explicit values:

It's very important to note that the argument passed to the @Value annotation can only be a String . Spring will convert the value to the specified type and the assignment will be done without any problems - even if we are passing String values to int or boolean variables.

  • Spring Environment

Injecting values from properties files with the help of @Value annotation is probably the most used use-case in real-life applications.

We will use the default property file for Spring Boot - application.properties , where we can define variables that we can access afterwards:

In this example, the values for the variables are being read from the application.properties file and assigned to them during bean creation.

Most of the time, we'd use this approach to inject configuration values from the application.properties file into beans.

  • Default Value

Default values are used as a "fallback" if the property we wish to inject isn't defined or missing:

In the above example, because we don't have any car.type property in application.properties , Spring will assign Sedan to the type variable as the default value.

If the car.type property gets inserted into the properties file, the new value will be used instead.

  • System Variables

We can also access system variables which are stored as properties by the Spring application at start:

The variables can be called with different naming conventions - Spring searches for us and assigns the correct value.

  • Global Method Value

Because @Value is processed by the BeanPostProcessor class, it will be invoked when Spring is building the Spring context by instantiating configuration files and beans.

This means that by having @Value on a method, all the arguments will be mapped with the value provided to the annotation:

If we are printing carData.getCarColor() and carData.getCarBrand() we will get the car.brand value both times, because like we said, all arguments will be mapped with the value provided.

  • Parameter Method Value

We can fix this by using @Value directly on the method parameter:

Now, if we are printing the values from the carData object - the color field will have the car.color value, because we provided the value to the parameter of the method itself.

  • Spring Expression Language (SpEL)

The Spring Expression Language (SpEL) is an expression language which serves as the foundation for expression evaluation within the Spring portfolio.

Basically, when using SpEL together with the @Value annotation, we are just changing the way we tell Spring what we need. Let's take a closer look:

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This is how you'd inject a specific system property. On the other hand, we could inject all properties by:

We know now, that we can use the @Value annotation for methods as a global value or as a parameter value.

Since constructors are essentially methods, we can use the annotation in constructors as well:

  • Injecting into Maps

With SpEL, we can do some other fairly interesting things when coupled with the @Value annotation. For example, let's make a Map that represents indoor and outdoor hobbies of a student. Each of these can have multiple values:

Now, to inject this, we'll need a Map<String, List<String>> :

  • Injecting into Lists

If a property has comma-separated-values, such as a simple list of books, we can use SpEL to interpret it and transform it into a list:

By using the split() method, and splitting for every comma ( , ), we can inject these values into a list:

As soon as you end up working on a real application, you realize that configuration is an important topic and if you are using Spring. There's a big chance you already use or you will have to use the @Value annotation extensively.

Understanding this basic functionality is very important because if you don't, you might end up using it totally wrong.

We also need to be aware that not everything that looks simple is also very good for long term solutions. For example, we should only use @Value in encapsulated components/services (we can call them configuration services).

This way, we will have all our configurations in one place, and that component will only have the responsibility of loading and providing them to other components.

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Spring Read Classpath Resource using @Value

Tags: Spring Framework Resource Value Annotation Classpath

In this Java Spring Framework tutorial, we learn how to use @Value annotation to read classpath resource files located in the resources folder in your Spring application project.

For example, we have a text file located at /src/main/resources/data.json in the Spring application project.

Next step, we implement a new class named ResourceService and implement a method to read the data.json file and return it as a String object. In this service class we use @Value annotation to load the data.json file to the Resource object.

ResourceService.java import java.io.IOException ; import java.io.InputStream ; import org.springframework.beans.factory.annotation.Value ; import org.springframework.core.io.Resource ; import org.springframework.stereotype.Service ; import org.springframework.util.FileCopyUtils ; @Service public class ResourceService { @Value ( "classpath:data.json" ) private Resource dataResource ; public String readDataResourceAsString () throws IOException { InputStream inputStream = dataResource . getInputStream (); byte [] fileData = FileCopyUtils . copyToByteArray ( inputStream ); String outputString = new String ( fileData ); return outputString ; } }

How to use ResourceService class

Firstly, declare the resourceService object.

And return data.json file from classpath as a String object.

Happy Coding 😊

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Computer Science > Computation and Language

Title: dependency annotation of ottoman turkish with multilingual bert.

Abstract: This study introduces a pretrained large language model-based annotation methodology for the first dependency treebank in Ottoman Turkish. Our experimental results show that, iteratively, i) pseudo-annotating data using a multilingual BERT-based parsing model, ii) manually correcting the pseudo-annotations, and iii) fine-tuning the parsing model with the corrected annotations, we speed up and simplify the challenging dependency annotation process. The resulting treebank, that will be a part of the Universal Dependencies (UD) project, will facilitate automated analysis of Ottoman Turkish documents, unlocking the linguistic richness embedded in this historical heritage.

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COMMENTS

  1. Wiring in Spring: @Autowired, @Resource and @Inject

    @Resource private File defaultFile; Then we run the test again. The test will still pass because if the @Resource annotation doesn't receive a bean name as an attribute value, the Spring Framework will proceed with the next level of precedence, match-by-type, in order to try resolve the dependency.. 2.1.3. Match by Qualifier. To demonstrate the match-by-qualifier execution path, the ...

  2. A Quick Guide to Spring @Value

    As a basic and mostly useless example, we can only inject "string value" from the annotation to the field: @Value("string value") private String stringValue; Using the @PropertySource annotation allows us to work with values from properties files with the @Value annotation. In the following example, we get Value got from the file assigned ...

  3. Resources :: Spring Framework

    The template path can then be referenced via the @Value annotation using a property placeholder (see Using @Value). Spring will retrieve the value of the template path as a string, and a special PropertyEditor will convert the string to a Resource object to be injected into the MyBean constructor. The following example demonstrates how to ...

  4. Using @PropertySource Annotation and Resource Interface

    Here, we are using @PropertySource annotation with a value of classpath:discounts.properties in the Java config class. The classpath: prefix tells the Spring to search for the discounts.properties file in the Java classpath. Once we define the @PropertySource annotation to load the properties file, as we discussed earlier, we also need to ...

  5. Spring @Value Annotation with Example

    Spring @Value Annotation is a powerful feature that allows you to inject values from external sources into your beans. In this article, you will learn how to use @Value Annotation with different types of values, such as literals, properties, expressions, and arrays. You will also see how to use @Value Annotation with constructor and setter injection, and how to handle conversion and validation ...

  6. java

    The primary difference is, @Autowired is a spring annotation. Whereas @Resource is specified by the JSR-250, as you pointed out yourself. So the latter is part of Java whereas the former is Spring specific. Hence, you are right in suggesting that, in a sense.

  7. Mastering Resource Handling in Spring

    In Spring Framework, the @Value annotation plays a pivotal role when it comes to managing configurations and externalizing resource properties. This versatile annotation allows you to inject ...

  8. Using @Value :: Spring Framework

    Using. @Value. @Value is typically used to inject externalized properties: In that case, the catalog parameter and field will be equal to the MovieCatalog value. A default lenient embedded value resolver is provided by Spring. It will try to resolve the property value and if it cannot be resolved, the property name (for example $ {catalog.name ...

  9. Injection with @Resource :: Spring Framework

    Injection with. @Resource. Spring also supports injection by using the JSR-250 @Resource annotation ( jakarta.annotation.Resource) on fields or bean property setter methods. This is a common pattern in Jakarta EE: for example, in JSF-managed beans and JAX-WS endpoints. Spring supports this pattern for Spring-managed objects as well.

  10. Spring

    Injecting Resource in a @Bean method package com.logicbig.example; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans ...

  11. A guide to @Value in Spring Boot

    The @Value annotation is the quickest way to access the application.properties values in Spring Boot. It comes with some powerful features which we will explore in this tutorial. @Value Annotation in Spring Boot. The @value annotation is the easiest way to inject values into primitive fields. To demo this, let's set up an application with ...

  12. Load a Resource as a String in Spring

    InputStream inputStream = resource.getInputStream(); Our next step is to take this InputStream and convert it to a String.We can use Spring's own FileCopyUtils#copyToString method:. public class ResourceReader { public static String asString(Resource resource) { try (Reader reader = new InputStreamReader(resource.getInputStream(), UTF_8)) { return FileCopyUtils.copyToString(reader); } catch ...

  13. The @Value Annotation in Spring

    Introduction. The main focus of this article is to help you understand how Spring's @Value annotation works. @Value is a Java annotation that is used at the field or method/constructor parameter level and it indicates a default value for the affected argument. It is commonly used for injecting values into configuration variables - which we will show and explain in the next part of the article.

  14. Spring Read Classpath Resource using @Value

    In this Java Spring Framework tutorial, we learn how to use @Value annotation to read classpath resource files located in the resources folder in your Spring application project. For example, we have a text file located at /src/main/resources/data.json in the Spring application project. Next step, we implement a new class named ResourceService ...

  15. Resource (Java Platform SE 8 )

    @Target(value={TYPE,FIELD,METHOD}) @Retention(value=RUNTIME) public @interface Resource. The Resource annotation marks a resource that is needed by the application. This annotation may be applied to an application component class, or to fields or methods of the component class. When the annotation is applied to a field or method, the container ...

  16. Spring @Resource Annotation Example

    Spring @Resource Annotation Example. JDK JSR-250 provides a property or method-level annotation that supports the Autowiring functionality in the spring framework. Spring supports this injection by using the @Resource annotation, applied to either the property or the setter method of a bean. This tutorial will explore the JDK-specific @Resource ...

  17. Read a File from Resources in Spring Boot

    Learn to read a file from the '/resources' folder in a Spring boot application using ClassPathResource class, ResourceLoader interface or @Value annotation. @Autowired private ResourceLoader resourceLoader; public void method(){ Resource resource = resourceLoader.getResource("classpath:filename.txt"); File file = resource.getFile()); //...

  18. java

    I am studying @Resource, @Resources injection in java. Oracle docs and some other sites are explaining field, method and class resource injection with @Resource annotation but I could not find help for Multiple class resources injection using @Resources annotation - Actually I want to know how multiple resources declared by @Resources annotation on class will be used in class?

  19. Java Spring: How to use `@Value` annotation to inject an `Environment

    3. There are 17 ways to override a property value in spring boot, one of them is environment variables (Item 10. in the official documentation. The only trick is that you have to convert property names to to uppercase and underscore. For example if you want to overwrite the property. myApp.myProperty.

  20. Dependency Annotation of Ottoman Turkish with Multilingual BERT

    Download PDF HTML (experimental) Abstract: This study introduces a pretrained large language model-based annotation methodology for the first dependency treebank in Ottoman Turkish. Our experimental results show that, iteratively, i) pseudo-annotating data using a multilingual BERT-based parsing model, ii) manually correcting the pseudo-annotations, and iii) fine-tuning the parsing model with ...

  21. Give external path in @Value Spring annotation and Resource

    1. Use the key spring.config.location in properties to set the config location. Spring-boot will by default load properties from the locations, with precedence like below : A /config subdir of the current directory. The current directory. A classpath /config package. The classpath root.

  22. Resource (Java EE 6 )

    @Target(value={TYPE,FIELD,METHOD}) @Retention(value=RUNTIME) public @interface Resource. The Resource annotation marks a resource that is needed by the application. This annotation may be applied to an application component class, or to fields or methods of the component class. When the annotation is applied to a field or method, the container ...

  23. How to correctly specify a default value in the Spring @Value annotation?

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