So, we have already dabbled into Relationships in JPA, in particular One-To-Many and Many-To-One. It is now time to give a look into Many-To-Many, which is very similar to One-To-Many Relationships. So at this point you should have read the previous two tutorials on JPA 2, but if for some...
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Recently I had to write some code to generate excel files using Apache POI. One of the files was fairly complex and used formulas in a few cells. I found myself spending a few hours searching for a way to translate the indexed column numbers that POI uses to the...
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The default glassfish app. server installation comes with local JMX connections enabled by default. To enable JMX connections from remote hosts all that's needed is to add -Djava.rmi.server.hostname=<hostname> in the JVM Options of the instance of GlassFish, where <hostname> is the external...
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Multi Threading is one of the most interesting subjects when developing applications, be them in Java or any other Language: The ability to have ones software performing multiple tasks at the same time, maybe handling multiple requests from users, parallel processing things... wicked stuff really! On the other hand... when...
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Following from the previous tutorial we now dive into move interesting and complex parts of JPA 2: Relationships! In this tutorial we'll be focusing on One-to-Many relationships (mainly Bidirectional), looking into their particularities (specially related to the Cascading of operations), we'll create a JUnit Test class for testing the Relationship,...
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So, one of the most common comments I get to hear while at work almost every week regarding JPA is : "Oh I Just hate JPA!" . I never really had much of a problem with it, obviously sometimes with JPA something just doesn't want to work for some strange reason and...
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