IBM User Guide for Java V7 on Windows > Developing Java applications

Determining whether your application is running on a 32-bit or 64-bit JVM

Some Java™ applications must be able to determine whether they are running on a 32-bit JVM or on a 64-bit JVM. For example, if your application has a native code library, the library must be compiled separately in 32- and 64-bit forms for platforms that support both 32- and 64-bit modes of operation. In this case, your application must load the correct library at run environmenttime, because it is not possible to mix 32- and 64-bit code.

The system property com.ibm.vm.bitmode allows applications to determine the mode in which your JVM is running. It returns the following values:

• 32 - the JVM is running in 32-bit mode
• 64 - the JVM is running in 64-bit mode

You can inspect the com.ibm.vm.bitmode property from inside your application code using the call:

System.getProperty("com.ibm.vm.bitmode");

Parent: Developing Java applications

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