How can Java Web read new changes on attributes automatically? [duplicate]

Question

I just have created a Java Filter that, if one of its properties has a true value, the filter will redirect all the requests to a maintenance JSP (the server is not operational). If that property has a false value, the filter will redirect to the right target. The filter reads the boolean value from a config.properties file. It's something like this:

// Read the file property
private static boolean MAINTENANCE = Boolean.parseBoolean(p.getProperty("maintenance"));
...

if(MAINTENANCE) {
   redirectToURL("maintenance.jsp"); // maintenance JSP
}
else {
   chain.doFilter(request, response); // requested jsp/servlet
}
...

The point is... If my Web is running and I want to put it in maintenance mode, how could I do to make the server reads the new value of that property from the file?

I mean: I connect to the server, edit the config file, set "maintenance" property to value equal to true... But, how can I do to make the web application read it?

Thanks!

Which application server are you planning on using? Have you tried taking a look at these answers: update properties file run time, change properties file run time and Update properties file at runtime. — António Ribeiro
– António Ribeiro, Commented Aug 23, 2017 at 14:37
Then take a look at this answer. Furthermore, you should think about creating a way of modifying your config file through your application. That way you could trigger its reload and replace the values loaded on the container's initialization. — António Ribeiro
– António Ribeiro, Commented Aug 23, 2017 at 14:42

Ommadawn · Accepted Answer · 2017-08-23 14:52:08Z

0

Thanks to @aribeiro, I achieved the solution for me.

For the WebApp startup, I would read the properties from the file.

When I want to make a change of some attribute, I would have to use a request that changes explicitly the value (maybe from an own admin panel).

answered Aug 23, 2017 at 14:52

Ommadawn

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