Reading time ~6 minutes

In this post I will show you how to setup two or more data sources in a Spring application where the access to the database is done via JPA. It will be a XML-based Spring configuration. To highlight the setup I will use a showcase that builds on an existing demo example I have committed on GitHub, that covers other two posts of mine

Don’t worry! You don’t have to understand what’s going on in those if you just want to see how the setup for multiple data sources looks like – I’ll do a quick introduction in the first part of the post.

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Reading time ~1 minute

One thing I immediately needed when using GIT/EGit instead of Subversion/Subversive in Eclipse,  was the possibility to quickly revert the changes I made to a file. The good news is that with EGit it goes just as fast…

Revert changes:

  • Subversive  – right click on file > Team > Revert…
  • EGit – right click on file > Replace With > File in Git Index
Replace with file from Git index

Replace with file from Git index

Reading time ~1 minute

There are quite often situations, when you’d need to add or substract a time period to a date when you are accessing the database via Java Persistence API(JPA). Now

  • the bad news is that Java Persistence Query Language(JPQL) does not support such operations on dates yet.
  • the good news is that it is possible by using a native query or doing the computation on the Java side. I prefer the second option as it provides database independence.
    • Reading time ~1 minute

    It was about “time”…

    Java SE 8 Date and Time

    by Ben Evans and Richard Warburton

    Reading time ~1 minute 

    <head>
<title>Hoisting example</title>
</head>
<body>
    <h1>Hoisting in action</h1>
    <script type="application/javascript">
        var hoisting = "global variable";
        alert("global 'hoisting' var => " + hoisting);
        (function(){
            alert("local 'hoisting' var (BEFORE declaration WILL NOT PICK its global 'shadow' -> undefined !) => " + hoisting);
            var hoisting = "local variable";
            alert("local 'hoisting' var (AFTER declaration WILL HIDE its global 'shadow' -> assigned value !) => " + hoisting);
            // block
            {
                var hoisting = "block variable";
                alert("block 'hoisting' var (AFTER declaration WILL OVERRIDE its local 'shadow' -> assigned value !) => " + hoisting);
            }
            // after block
            alert("local 'hoisting' var REPLACED AFTER BLOCK with its block 'shadow' => " + hoisting);
            // THE moral
            alert("The Hoisting MORAL: ALL local variables (even from blocks) are pre-defined/hoisted by JavaScript Runtime in front of the method body !\nDYI to make it clear !");
        })(); //self-executing function 
    </script>
</body>

    Thank you Dev{eloper} Stonez (@devstonez) for the tip.