How to Determine if a JVM Option was Set from Within a Java Application?

Accessing VM Arguments from Within Java

Question:

How can I determine if a specific JVM option was explicitly set or left with its default value from within a Java application? Specifically, I require the ability to create a thread with a custom native stack size. However, if the user has specified the "-Xss" option, I need to revert to the default stack size.

Answer:

To access VM arguments inside your Java code, employ the following strategy:

During startup, pass the desired option using the "-D" flag:

-Dname=value

Within your code, retrieve the specified value using the "System.getProperty()" method:

value = System.getProperty("name");

By utilizing this approach, you can readily check whether a specific JVM option has been explicitly set or defaults to its standard value.

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