How do I detect whether 32-bit Java is installed on x64 Windows, only looking at the filesystem and registry?

This seems to provide the info on Windows:

2.) Key in: java -XshowSettings:all and hit ENTER.

3.) A lot of information will be displayed on the command window. Scroll up until you find the string: sun.arch.data.model.

4.) If it says sun.arch.data.model = 32, your VM is 32 bit. If it says sun.arch.data.model = 64, your VM is 64 bit.

Do you have access to the command prompt ?

Method 1 : Command Prompt

The specifics of the Java installed on the system can be determined by executing the following command java -version

Method 2 : Folder Structure

In case you do not have access to command prompt then determining the folder where Java.

32 Bit : C:\Program Files (x86)\Java\jdk1.6.0_30

64 Bit : C:\Program Files\Java\jdk1.6.0_25

However during the installation it is possible that the user might change the installation folder.

Method 3 : Registry

You can also see the version installed in registry editor.

Go to registry editor
Edit -> Find
Search for Java. You will get the registry entries for Java.
In the entry with name : DisplayName & DisplayVersion, the installed java version is displayed

Check this key for 32 bits and 64 bits Windows machines.

 HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment

and this for Windows 64 bits with 32 Bits JRE.

 HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\JavaSoft\Java Runtime Environment

This will work for the oracle-sun JRE.

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