Скачать или смотреть Understanding the java Command vs. mvn spring-boot:run Command in Spring Boot Applications

Learn the crucial differences between the `java` command and the `mvn spring-boot:run` command in Spring Boot, especially when integrating with services like HashiCorp Vault.
---
This video is based on the question https://stackoverflow.com/q/62218482/ asked by the user 'Niko2510' ( https://stackoverflow.com/u/13402275/ ) and on the answer https://stackoverflow.com/a/62218692/ provided by the user 'Simon Martinelli' ( https://stackoverflow.com/u/1045142/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Java Command vs spring-boot:run command

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Understanding the java Command vs. mvn spring-boot:run Command in Spring Boot Applications

When developing Spring Boot applications, you might encounter various command options to run your project. Two common commands are the traditional java command and the Maven command mvn spring-boot:run. While both serve the purpose of running your application, they behave differently under certain configurations, particularly when integrating services such as HashiCorp Vault.

In this guide, we'll explore a specific situation where switching between these commands leads to an exception and detail the necessary steps to resolve the issue.

The Problem

Imagine you have a Spring Boot application integrated with HashiCorp Vault for configuration management. You run your application using the following command:

[[See Video to Reveal this Text or Code Snippet]]

This command executes without any issues. However, when you try to start the same application using:

[[See Video to Reveal this Text or Code Snippet]]

You encounter a series of exceptions indicating problems with bean creation and configuration. Here’s an excerpt from the error messages you might see:

[[See Video to Reveal this Text or Code Snippet]]

What’s Going Wrong?

The primary issue arises from the way these commands handle application profiles and properties. While the java command allows you to set the active profile directly via system properties, the Maven command requires a different approach.

The Solution

To successfully run a Spring Boot application with a specific profile using Maven, you must pass the profile explicitly as part of the command. Here’s how you can modify your command:

[[See Video to Reveal this Text or Code Snippet]]

Breakdown of the Solution

mvn spring-boot:run: This part of the command invokes the Maven Spring Boot plugin to start the application.

-Dspring-boot.run.profiles=dev: This flag specifies that the dev profile should be activated for this session. Maven uses this information to apply the necessary configuration settings defined within the dev profile.

Why Does This Matter?

By using the correct command, you ensure that:

The application reads the configuration files and properties specific to the dev profile, including secret tokens required by Vault.

You minimize the chances of encountering runtime exceptions related to bean creation due to missing or incorrect configurations.

Conclusion

Understanding the nuances between the java command and the Maven command for running Spring Boot applications is essential, especially when dealing with integrated services like HashiCorp Vault. By knowing how to properly set active profiles when using Maven, you can prevent errors and ensure your application runs smoothly.

If you ever encounter issues with configuration properties or bean creation errors while using Maven, remember to check that you are correctly passing the profile as illustrated.

Further Reading

For those interested in deepening their understanding of Spring Boot and its application profiles, consider exploring the official Spring Boot documentation and specific guidelines for integrating with HashiCorp Vault.