Скачать или смотреть Unlocking the Secrets of Java Compliance Level from the Command Line

Learn how to easily retrieve the `Java compliance level` from the command line, making it easier to manage your Java environment settings and automate your configurations for Eclipse.
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Unlocking the Secrets of Java Compliance Level from the Command Line

Java is an essential programming language, and keeping track of its compliance levels can often be a crucial step in configuring your development environment. If you're using Eclipse and want to automate the configuration process, knowing how to retrieve the correct Java compliance level is key. In this post, we'll guide you through the steps to extract this information from the command line, ensuring your development tools are always aligned with your Java installation.

The Challenge: Retrieving the Compliance Level

When using Java in Eclipse, you may notice that the default VM configuration includes a parameter identifying the Java compliance level, such as 57 in the following format:

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

The problem arises when you want to automatically extract this compliance level for Java versions like Java 14. A simple command such as java --version only provides the version (e.g., 14.0.2), but it doesn’t show the compliance level. This limitation can hinder your ability to set up your Eclipse environment effectively.

Solution: Extracting Compliance Level Information

To solve this problem and retrieve the Java compliance level, we can use the -XshowSettings option, which provides several important configurations, including the java.class.version, which corresponds to the compliance level. Here's a step-by-step guide to obtaining this information.

Step 1: Use the Correct Command

You will need to run the following command in your terminal:

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

This command reveals all settings. However, we only need the java.class.version line that indicates the compliance level.

Step 2: Filter for the Relevant Information

If you want to retrieve just the compliance level without all the surrounding details, you can leverage the grep command (on Unix-like systems) to filter the output. Here’s how you can do it for different Java versions:

For Java 13:

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

You should see an output like:

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

For Java 14:

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

The output will look like this:

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

Step 3: Interpretation of the Output

The numbers returned in the output correspond to the following compliance levels:

57.0 corresponds to Java 13

58.0 corresponds to Java 14

With these compliance levels at hand, you can easily parse this data and utilize it in your auto-configuration scripts for Eclipse.

Conclusion

Having the ability to retrieve the Java compliance level from the command line not only saves time but also streamlines your setup for development environments like Eclipse. By using the appropriate commands and filtering the output, you can ensure that your configurations remain accurate, regardless of how often you update your Java version.

Feel free to take this guidance and apply it to your own Java setup for smoother development experience. Happy coding!