Java 8 is only supported together with TAC Vista 5.1.9
Xenta Server web
The current version was developed and tested together with Java version 7, but not Java version 8 as Java 8 was released subsequently
After the latest update of Java (Javav 8u31) SSLv3 has been disabled by default in Java. If updating to that version of Java, the Xenta Server web (graphics and schedules) will not work, as the Xenta Server relies on SSLv3.
Making the proper configurations has enabled a number of sites to use Java 8 with the TAC Vista product range. Java 8 is supported for TAC Vista 5.1.9 according to TPA-VSTA-15-0000.03
The proper settings in Java are:
 Install the newest version of Java. If you are working on a 64 bit operating system, it's crucial that you install both the x86 and the x64 versions: https://java.com/en/download/manual.jsp
 Make sure all older versions are removed: https://java.com/en/download/uninstallapplet.jsp
 Make sure Java is enabled in your browser: https://java.com/en/download/help/enable_browser.xml
 Add all addresses to the site exception list in the "Security" tab. Both http and https addresses are needed for Xenta Servers. If a special port is used (not 80 for http and 443 for https), the port needs to be entered, e.g. http://IP_ADDRESS:81 if port 81 is used for HTTP communication.
 Click "Restore Security Prompts" in the "Security" tab.
 In some cases you might need to add the IP address of the PC or Xenta Server to trusted sites in Internet Explorer
TAC Xenta Server web uses SSLv3 for Java if high security is set in XBuilder. The workaround for SSLv3 being disabled in Java 8u31 and above is: (read Java's own release note)
 Edit the following two files:
C:\Program Files (x86)\Java\jre1.8.0_31\lib\security\java.security
 Scroll down to the last line where it says: jdk.tls.disabledAlgorithms=SSLv3
In both files, comment that line so it says: #jdk.tls.disabledAlgorithms=SSLv3
 Edit the file: C:\Users\%username%\AppData\LocalLow\Sun\Java\Deployment\deployment.properties
 Add the following line: deployment.security.SSLv3=true