How to Access and Check JVM Arguments within a Java Application?

Retrieving VM Arguments Within a Java Application

To determine whether a specific VM argument has been explicitly set or remains at its default value, it is necessary to explore the options available to access VM arguments from within a Java application.

Accessing VM Arguments

The Java runtime environment (JRE) offers limited functionality for accessing VM arguments. The classes java.lang.System and java.lang.Runtime do not provide direct access to this information.

Alternative Approach

A practical solution involves utilizing the -D option when starting the Java application. By specifying -Dname=value, a custom system property can be defined and accessed within the application.

Retrieving Defined Properties

To retrieve the value associated with a defined system property, utilize the System.getProperty() method:

String value = System.getProperty("name");

where "name" represents the name assigned to the custom system property.

Conclusion

By leveraging the -D option and the System.getProperty() method, it is possible to retrieve VM arguments and ascertain whether a specific option has been explicitly set or remains at its default value. This approach provides a convenient means of tailoring the application's configuration based on user-defined settings.

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