Running Java HotSpot Client VM

JVM Tutorials - Herong's Tutorial Examples

∟Running Java HotSpot Client VM

This section provides you a tutorial example on how to run Java HotSpot Client VM - run Java command in default mode: 'java'.

After installing JDK, the Java HotSpot Client VM should be available on my machine. To verify this, I used the following command to try it:

herong> java -version -client
java version "17.0.1" 2021-10-19 LTS
Java(TM) SE Runtime Environment (build 17.0.1+12-LTS-39)
Java HotSpot(TM) 64-Bit Server VM (build 17.0.1+12-LTS-39, mixed mode, sharing)

herong$ java -version -client
java version "14.0.1" 2020-04-14
Java(TM) SE Runtime Environment (build 14.0.1+7)
Java HotSpot(TM) 64-Bit Server VM (build 14.0.1+7, mixed mode, sharing)

herong> \progra~1\java\jdk-10.0.1\bin\java -version
java version "10.0.1" 2018-04-17
Java(TM) SE Runtime Environment 18.3 (build 10.0.1+10)
Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10.0.1+10, mixed mode)

Surprisingly, Java HotSpot Client VM is not provided in 64-bit version of JDK 10 and higher. The "java" command runs Java HotSpot Server VM only, even if you specify the "-client" option.

Examples of running older versions of Java HotSpot Client VM:

herong> \progra~1\java\jdk1.8.0_45\bin\java -version
java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b15)
Java HotSpot(TM) Client VM (build 25.45-b02, mixed mode)

herong> \progra~1\java\jdk1.7.0_45\bin\java -version
java version "1.7.0_45"
Java(TM) SE Runtime Environment (build 1.7.0_45-b18)
Java HotSpot(TM) Client VM (build 24.45-b08, mixed mode, sharing)

herong> \progra~1\java\jdk1.6.0_02\bin\java -version
java version "1.6.0_02"
Java(TM) SE Runtime Environment (build 1.6.0_02-b06)
Java HotSpot(TM) Client VM (build 1.6.0_02-b06, mixed mode, sharing)

herong> \progra~1\java\j2sdk1.4.0_02\bin\java -version
java version "1.4.0_02"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0_02-b02)
Java HotSpot(TM) Client VM (build 1.4.0_02-b02, mixed mode)