a mac and glasses

A Less Mixin for JSF 2 Resource Handling

JSF 2.0 introduced it’s own resource handling. One of the disadvantages of this solution is, that referring to an images inside your CSS doesn’t work the common way:

.foo {
    background-image: url('images/logo.gif'); // doesn't work with JSF 2.x
}

You need to use expression language like:

.foo {
    background-image: url("#{resource['images/logo.gif']}");
}

Now if you are using LESS and don’t want to write this expression over and over again—you need a mixin:

.background-image(@filename) {
    background-image: e(%("url(#{resource['images:%s']})", @filename));
}
public class FooService {

    // TODO: remove me!
    // public final static String NOT_YET = "";

    ...
}

(Taken from production code)

clock

Timeout Configuration in HikariCP, DB2 and MySQL

Motivation

Michael T. Nygard warns in “Release it” [1] about the lack of timeouts caused by misconfigured database drivers and connection pools. He argues that if a connection pool gets exhausted when none of its calls return than all others threads get blocked as soon as they require a connection too. His advice is:

Scrutinize Resource Pools
Safe resource pools always limit the time a thread can wait to check out a resource.
(Michael T. Nygard, “Release it”, P. 50)

So I wondered, whether the connection pool HikariCP as well as the JDBC-driver of IBM DB2 and MySQL already ships with default timeouts (and how to adjust them).

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