RepreZen API Studio requires 64-bit 64-bit Java 8 or higher, and requires that the JAVA_HOME environment variable is set to the JDK directory.

Verifying Java Version and Bitness

To verify the version and bitness of your Java installation, you can run java -version from the command line. You should see output like this:

C:\TOOLS>%java_home%\bin\java -version
java version "1.8.0_91"
Java(TM) SE Runtime Environment (build 1.8.0_91-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.91-b14, mixed mode)

Note that the last nice specifies "64-bit".  If you see a message that does not specify bitness, this indicates that you are running 32-bit Java.  You will need to follow the directions below.

Reinstalling API Studio with a 64-bit JDK

If you are still seeing an error message from API Studio or the automated installer about this requirement, please try the following troubleshooting steps:

  1. Uninstall RepreZen API Studio using the automated uninstall utility.  
    • In Windows:  Control Panel / Programs / Programs and Features / RepreZen API Studio
    • In Mac OS:  there is no automated uninstall.  Proceed to the next step.

  2. Make sure the RepreZen API Studio directory is removed completely.  
    • In Windows:  By default, this will be the RepreZen/API_Studio directory under your home directory.
    • In Mac OS:  This is the ~/RepreZen directory created during installation.

  3. Reinstall the JDK.  
    • It is important to install the 64-bit JDK with 64-bit operating systems. A 32-bit JDK will not work correctly, and may display an error on startup.
    • We recommend that you install the latest JDK from the JDK download page.

  4. Make sure the JAVA_HOME environment variable is set to the JDK directory.

  5. Reinstall RepreZen API Studio, using the automated installer.


This should resolve the issue.