Java 11 and 12 – New Features

Usage of CDS

You can manually control usage of CDS by switching it on, switching it off, or putting it on automode. These are the command-line options to do so:

• java -Xshare:off: Disables CDS
• java -Xshare:on: Enables CDS
• java -Xshare:auto: The default mode (it enables CDS whenever possible)

Let's quickly define a class as follows:

class ConquerWorld { 
    public static void main(String args[]) { 
        System.out.println("Go and conquer the world"); 
    } 
} 

Let's execute the preceding class (ConquerWorld) using the shared archive file, classes.jsa. To view the system class loading from the shared archive, you can use a log file with class execution, as follows:

    java -Xlog:class+load:file=myCDSlog.log ConquerWorld  

The preceding command outputs the following: ...