Where is the value recorded with System.setProperty stored?

Question

In the following example System.setProperty used

public class LoadLogPropertiesFile {

    static {
        // must set before the Logger
        String path = LoadLogPropertiesFile.class.getClassLoader().getResource("logging.properties").getFile();
        System.setProperty("java.util.logging.config.file", path);

    }

    private static Logger logger = Logger.getLogger(LoadLogPropertiesFile.class.getName());

    public static void main(String[] args) {
    ...

As you might guess this will set the system property with the key java.util.logging.config.file, right?

From the docs

This may result in a SecurityException being thrown. If no exception is thrown, the specified property is set to the given value.

As a result no exception was thrown and no system property with a given name was detected after this code finished. What is wrong?

Answer 1

Values that you set with System.setProperty() are stored in a Properties object of the currently running JVM. You can retrieve that Properties object through System.getProperties() or access values from that Properties object with System.getProperty().

These properties are not made visible to any process outside of the currently running JVM.