Just burned almost 3 hours getting Java 7 installed on a V7.6.6 gateway. Thank goodness it was a weekend on only my time and not the plant’s production time.
Needed Java 7 to demo the mobile, does not run with V7.6.6 and Java 6.
After downloading and installing java 7 , gateway still reported Java 6 was in use. Even after rebooting gateway.
To make a long story short, when Java 7 is installed, it creates a /jre7/ folder. On an existing Ignition Gateway, the default path to Java ( on a 64bit OS ) will be C:/ProgramFiles/Java64/. Java 7 installs files and subfolders in C:/ProgramFiles/Java64/jre7/.
I eventually figured out, after several attempts, that during the Java install to change the destination folder when prompted to C:/ProgramFiles/Java64 and continue the installation to overwrite the Java 6 files.