Скачать или смотреть How to Fetch Properties from application-test.properties in a Spring Boot Java Class

Learn how to fetch properties from the `application-test.properties` file in a Spring Boot application using Java. This guide breaks down the steps to help you troubleshoot common issues and efficiently access your configuration properties.
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Fetching Properties from application-test.properties in Spring Boot

When working with Spring Boot applications, it is common to configure your application using properties files. One such file is application-test.properties, which allows you to specify test-specific configurations. However, if you've encountered issues when trying to access properties from this file, you're not alone. Let's take a look at how to effectively fetch these properties and the steps to troubleshoot common errors.

The Problem

You have a property defined in your application-test.properties file as follows:

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You want to access this property in your Java class, specifically using Spring's -Value annotation. You've set your active profile to test, but you keep encountering an IllegalArgumentException stating that the placeholder ${machineName} cannot be resolved. This can be frustrating if you've followed examples online but still find that your application isn't functioning as expected.

Understanding the Solution

Step 1: Ensure Correct Profile Activation

First, you need to confirm that your Spring Boot application is running with the correct active profile. If the active profile is not correctly set, Spring Boot will not load the properties from application-test.properties. You can set the active profile in several ways:

Via Command Line: Use the following command to run your application with the specified profile:

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or

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or

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Make sure to use one of these methods when launching your application to ensure that it recognizes the correct profile.

Step 2: Accessing Properties in Java Class

To access the properties defined in your application-test.properties, you can follow this example structure in your Java code. The code you provided looks good, but ensure that your -Value annotation is correctly pulling in the property.

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Step 3: Using the Environment Class

You can also use the Environment class to directly access properties. This involves injecting the Environment bean into your class. Here’s an example of how to implement it:

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Step 4: Checking Properties Loading

Make sure that your properties are loaded correctly. You can trace the process of properties loading in your application by adding log statements in the configuration class. Here is how you might set that up:

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Conclusion

By following these steps and utilizing the provided code snippets, you will be able to successfully fetch properties from your application-test.properties file in your Spring Boot application. If issues persist, ensure that your application is running with the right profile and that no typos exist in your property keys. Happy coding!