Linux – Automatic updating of newer JRE on GNU/Linux

Actually this problem is due to the control panel requiring administrator privileges to allow the Java control panel to save your settings (it hasn't been fixed for ages, thanks to Sun Microsystems).

First, you need to find the Java Control Panel executable, in one of the following locations:

C:\Program Files\Java\jre[version]\bin\javacpl.exe

or

C:\Program Files (x86)\Java\jre[version]\bin\javacpl.exe

The path will differ depending on your system's architecture and which version of Java you have installed. For example, a 32-bit version of Java 7 installed on a 64-bit version of Windows will have it in:

C:\Program Files (x86)\Java\jre7\bin\javacpl.exe

Once you've found the file, right-click it and select "Run as administrator".

From there, un-check "Check for Updates Automatically" on the Update tab and click OK. You can verify that the setting has been applied by navigating to the same screen as you normally would through the Control Panel.

You can also check your running processes to see that jusched.exe is no longer running - it was automatically terminated when you clicked OK.

Short answer: you can't. Ports below 1024 can be opened only by root. As per comment - well, you can, using CAP_NET_BIND_SERVICE, but that approach, applied to java bin will make any java program to be run with this setting, which is undesirable, if not a security risk.

The long answer: you can redirect connections on port 80 to some other port you can open as normal user.

Run as root:

# iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 8080

As loopback devices (like localhost) do not use the prerouting rules, if you need to use localhost, etc., add this rule as well (thanks @Francesco):

# iptables -t nat -I OUTPUT -p tcp -d 127.0.0.1 --dport 80 -j REDIRECT --to-ports 8080

NOTE: The above solution is not well suited for multi-user systems, as any user can open port 8080 (or any other high port you decide to use), thus intercepting the traffic. (Credits to CesarB).

EDIT: as per comment question - to delete the above rule:

# iptables -t nat --line-numbers -n -L

This will output something like:

Chain PREROUTING (policy ACCEPT)
num  target     prot opt source               destination         
1    REDIRECT   tcp  --  0.0.0.0/0            0.0.0.0/0           tcp dpt:8080 redir ports 8088
2    REDIRECT   tcp  --  0.0.0.0/0            0.0.0.0/0           tcp dpt:80 redir ports 8080

The rule you are interested in is nr. 2, so to delete it:

# iptables -t nat -D PREROUTING 2