how to find out jre version installed ,using a java program?
Hello,
Is there any way to find out the installed JRE version using a java program ?
The requirement is as follows:
There is a html page with 4 steps to install a software. each step is a link, which upon clicking does its work.
the first step is to install jre 1.4.2_11 if its not installed in the system. But how can i find out whether jre 1.4.2_11 is installed or not ?
Thanks in advance
For the hell of it... here is a list of properties you can query:
java.version Java Runtime Environment version
java.vendor Java Runtime Environment vendor
java.vendor.url Java vendor URL
java.home Java installation directory
java.vm.specification.version Java Virtual Machine specification version
java.vm.specification.vendor Java Virtual Machine specification vendor
java.vm.specification.name Java Virtual Machine specification name
java.vm.version Java Virtual Machine implementation version
java.vm.vendor Java Virtual Machine implementation vendor
java.vm.name Java Virtual Machine implementation name
java.specification.version Java Runtime Environment specification version
java.specification.vendor Java Runtime Environment specification vendor
java.specification.name Java Runtime Environment specification name
java.class.version Java class format version number
java.class.path Java class path
java.library.path List of paths to search when loading libraries
java.io.tmpdir Default temp file path
java.compiler Name of JIT compiler to use
java.ext.dirs Path of extension directory or directories
os.name Operating system name
os.arch Operating system architecture
os.version Operating system version
file.separator File separator ("/" on UNIX)
path.separator Path separator (":" on UNIX)
line.separator Line separator ("\n" on UNIX)
user.name User's account name
user.home User's home directory
user.dir User's current working directory
By html you mean webpage? Or a JEditorPane?
In the webstart docs they give some JavaScript (commie browsers) and VBScript (IE) for working out if Java is installed, and if not either kicking off the webstart installer, or pointing the user as the correct page.
Webstart can autoupdate the JVM if it is not the version the webstarted application requires.
mlka at 2007-7-14 23:01:29 >
1) If you wan't to findout the version of java installed on windows systems,
try: C:\Program Files\Java\<<all versions installed>>"
2) If you wan't to findout the version of java that your program is using, try this,
System.out.println(System.getProperties().getProperty("java.version"));
best wishes,
balaji t
