Скачать или смотреть How to Specify the main class with MANIFEST.MF Using Maven to Build a JAR

Discover how to correctly specify the `main class` in your `MANIFEST.MF` using Maven to build a JAR file, avoiding common pitfalls and errors.
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This video is based on the question https://stackoverflow.com/q/65181619/ asked by the user 'Nicholas Saunders' ( https://stackoverflow.com/u/4531180/ ) and on the answer https://stackoverflow.com/a/65181880/ provided by the user 'P.Sanjay' ( https://stackoverflow.com/u/7338170/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Specify the main class with MANIFEST.MF Using Maven to Build a JAR

Building a Java application packaged as a JAR file using Maven is a common task among developers. However, when it comes to setting up the MANIFEST.MF file to specify the main class, you might run into some challenges. In this guide, we will dive deep into how you can correctly define the main class in your pom.xml so that your JAR file can be executed seamlessly.

Understanding the Problem

You may have encountered an error message when trying to build your JAR file that looks like this:

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This error usually occurs when there are syntactical issues in your pom.xml file, specifically regarding where the <plugins> section is placed. Let's break down the corrections needed to resolve this issue and successfully specify your main class.

Solution: Correcting the pom.xml Structure

To define the main class in your JAR file using the Maven build system, follow these structured steps:

Step 1: Edit the pom.xml File

Make sure your pom.xml file is structured correctly. The <plugins> section should be nested within the <build> section. Here’s the correct structure:

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Step 2: Remove Syntax Errors

Ensure that there are no syntax errors in your XML file. Make sure the <build> tag is correctly defined as shown above. This will prevent Maven from throwing errors related to unrecognized tags.

Step 3: Build Your Project

Once you have made these changes, you can run the build command again:

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If done correctly, you should see output indicating that the JAR was created successfully without any errors. The main class will now be included in your MANIFEST.MF, allowing your JAR file to be executed with the command:

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Conclusion

Getting the configuration right in your Maven pom.xml is crucial for building executable JAR files. By following the steps in this guide, you should now be able to specify the main class in your MANIFEST.MF correctly. If you ever run into issues, remember to check the structure and placement of your tags within the XML file. Happy coding!