How Can I Access JVM Arguments from Within a Java Application?

Accessing Java Virtual Machine (JVM) Arguments Within Applications

In certain scenarios, it becomes necessary to verify whether an option passed to the JVM has been explicitly set or retains its default value. This may be particularly relevant when managing thread stack sizes within an application. When the user specifies the -Xss option to customize stack sizes, it's crucial to distinguish between default and user-defined values.

Java classes such as java.lang.System and java.lang.Runtime do not directly provide information about JVM arguments. To address this, a different approach is required.

To obtain the desired information, the program can pass the required parameter as a system property when the JVM starts. This is achieved by passing the following syntax at startup:

-Dname=value

Once the application is up and running, the code can utilize the following method to retrieve the argument:

value = System.getProperty("name");

By utilizing this technique, developers can dynamically check the value of JVM arguments within Java applications, enabling them to make informed decisions and customize their code accordingly.

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