After installing Java 6 update 11, unable to open .jnlp files.

Question

Appears to download application then quits without an error message. When clicking on the .jnlp file again, nothing happens. I can go into java preferences and remove the application from the cache, but it does the same thing, redownloads the application then doesn't open it.

Answer 1

Java is notoriously responsible for many vulnerabilities, if you must run it then these are the instructions:
Turning on Java
Why will Applets not run after getting Java through Apple Software Update?
Apple disables the Java plug-in and Webstart applications when the Java update is done using Software Update. Also, if the Java plug-in detects that no applets have been run for an extended period of time it will again disable the Java plug-in.
To enable the Java plug-in
Go to Finder > Applications > Utilities > Java Preferences.
In the Java Preferences window check the box for Enable Applet plug-in and Webstart applications.
Installing and updating Java
I DO NOT have Mac version 10.7.3 (Lion) or higher. How do I get Java for other Mac versions?
For Java versions 6 and below, Apple supplies their own version of Java. Use the Software Update feature (available on the Apple menu) to check that you have the most up-to-date version of Apple's Java for your Mac.
I DO have Mac version 10.7.3 (Lion) or higher.
Users of Lion Mac OS X 10.7.1 and 10.7.2 should upgrade to 10.7.3 or later versions via Software Update, so you can get the latest Java 7 version from Oracle.
Download page here:
https://www.java.com/en/download/manual.jsp#mac
Why is Java 7 available only for Mac OS X 10.7.3 and above?
The Java Runtime depends on the availability of an Application programming interface (API). Some of the API were added in Mac OS X 10.7.3. Apple has no plans to make those API available on older versions of the Mac OS.
Further Hardening your Mac against web based Java attacks
Harden your Mac against malware attacks