Question

I’ve installed java7 jre: java -version

java version "1.7.0_02"

Java(TM) SE Runtime Environment (build 1.7.0_02-b13)

Java HotSpot(TM) 64-Bit Server VM (build 22.0-b10, mixed mode)

I want to test if the -server option works in the JRE. That seems to be the default on my machine. I also want to check if both the -server and the -client options are supported. So I wrote the following program:

public class Info {
    public static void main(String... args) {
        System.out.println(System.getProperty("java.vm.name"));
        System.out.println(System.getProperty("java.vm.version"));
        System.out.println(System.getProperty("java.vm.info"));
    }
}

If I issue the command java -client -cp e:\temp Info from the jre7\bin installation folder the program prints:

Java HotSpot(TM) 64-Bit Server VM

22.0-b10

mixed mode

It prints the same for -server.

Are -client and -server ignored in the java7 jre? Is there online documentation about this behavior?

P.S. I know that there is now tiered compilation.

Answer 1

This is documented in the Java command page. With the 64-bit version of Java 7, only server mode is implemented. The -client option is quietly ignored. (Note that the manual says that this may change in future versions.)