4
How can I find out if there is Java Virtual Machine installed on my Windows 7?
Do I have a Java Virtual Machine on my Windows 7?
Answers
8
Open command prompt and type in the following:
java -version
This should give you the version of the JRE you have installed, something like:
java version "1.6.0_24"
Java(TM) SE Runtime Environment (build 1.6.0_24-b07)
If that fails, you can also check to see if you have any JRE installed. The default location is usually in ${HOME_DIR}\Program Files\Java\, where ${HOME_DIR} is usually C:\
The selected answer above is correct but be aware that a response like:
java version "1.6.0_24" Relates to: Java 6 Update 24 This confused me at first. From http://javatester.org/version.html
5
Run->cmd type java -version.
If you get complaint for unknown command then Java is not installed.
user65971
Posted 2011-11-29T08:02:10.460
Reputation: 317
10What if Java isn't in the path? – None – 2011-11-29T08:04:54.360
I think the installation always puts the bin directory in the path.I mean I have noticed that I always get java -version to respond with the version even if I have not selected java to be in the path during installation – user65971 – 2011-11-29T08:14:43.753
@Tomas, AFAIK when java is installed a "shortcut/alias" is added in Windows\System32 making it no longer necessary to add java in path – None – 2011-11-29T08:17:19.083
@Kennet:This is consistent with what I have noticed.I thought it installed bin in the path – user65971 – 2011-11-29T08:19:11.220
2
@Yahor10 is right. You can first type java and then java -version in command prompt. If this work you will see that JRE is installed and is in your path.
But if it is not in path you will not know it. So, I prefer to open regedit and go to key HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft. If this key does not exist java is not installed. If exists java is typically installed. Previous versions of java created registry entry that showed path where java is installed. I have just checked on my Win7, java1.6-27 and saw that such entry does not exist.
Other way is to got to ControlPanel/Programs and check there.
AlexR
Posted 2011-11-29T08:02:10.460
Reputation: 166
0
Either check java -version on the command line, look in your installed Software listing (control panel), check whether Program Files contains a folder named Java or look if there is an environment variable called JAVA_HOME.
If neither of those is true, there's a high probability that you don't have a JRE or JDK installed, but that's still not certain. AFAIK Windows 7 doesn't contain a JRE per se, so if you have a clean system you most likely don't have a JRE yet.
Thomas
Posted 2011-11-29T08:02:10.460
Reputation: 101
0
Another way is to check it online.
http://www.inaplex.com/Products/jvmCheck.aspx or
http://javatester.org/version.html
It is working on my system but i am not very sure about its accuracy.
Sangram
Posted 2011-11-29T08:02:10.460
Reputation: 382
It will only work if your browser has Java support. It is possible to have a JVM on your system but no Java support in the browser; this answer wouldn't work then. – That Brazilian Guy – 2018-12-20T15:33:20.617
Type "java" in your command line (cmd) – None – 2011-11-29T08:03:58.227