System Requirements

To run the Union Server you will need Java 1.8 or higher. To check your system's current Java version, issue the following command-line command:

java -version

Getting Java

Windows and Unix/Linux users can download Java here.

Mac users note:

  • As of April 2009, Java 1.6 requires the 64-bit version of Mac OSX
  • To download Java, use Software Update, under the Apple menu. However, note that Software Update may not change the system default version of Java to latest version of Java. To ensure that Union runs under Java 1.6 or higher, edit Union's startup and shutdown scripts to point directly to the desired version of Java. For example, to run Union under Java 1.6, change java to /System/Library/Frameworks/JavaVM.framework/Versions/1.6/Commands/java in both and Alternatively, change system's symbolic link for java as follows:
rm /usr/bin/java
sudo ln -s /System/Library/Frameworks/JavaVM.framework/Versions/1.6/Commands/java /usr/bin/java


java -cp lib\js-engine.jar;lib\js.jar;lib\union.jar;lib\stax-api-1.0.1.jar;lib\wstx-asl-3.2.6.jar net.user1.union.core.UnionMain start

Mac, Unix

java -cp lib/js-engine.jar:lib/js.jar:lib/union.jar:lib/stax-api-1.0.1.jar:lib/wstx-asl-3.2.6.jar net.user1.union.core.UnionMain start &