Posts Tagged ‘xml’

Creating slim Database Projections using JPA2 Constructor Expressions

Sunday, April 14th, 2013

One common question that you may encounter one day when using object-relational-mapping in your application is how to slim down data that you’re retrieving from the persistence layer down to a specific subset for your use-case in an efficient manner and without using complex additional mapping frameworks. In some situations you might declare lazy loaded fields but another approach that I’d like to share with you here are JPA2 constructor expressions.

Constructor expressions allow us to create plain old java objects from the result of an JPA query. The advantage is that we may use different projections for different scenarios and without being managed, the POJOs might help us save some resources here.

In the following tutorial, we’re going to persist 100 book entities with multiple properties to an embedded database and we’re using constructor expressions afterwards to create smaller POJOs using a subset of the information available from each persisted book.

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Snippet: XML-Pull-Parser with XPP3

Friday, December 28th, 2012

When there is XML to be parsed sometimes we’re chosing a DOM parser, sometimes a SAX parser and sometimes we’re using an XML pull parser, especially on Android.

The following short snippet shows how to use the xpp3 xml pull parse to fetch some information in xml format from a public issue tracker and to extract issue details.

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Contract-First Web-Services using JAX-WS, JAX-B, Maven and Eclipse

Tuesday, August 23rd, 2011

Using the contract-first approach to define a web service offers some advantages in contrast to the code-first approach.

In the following tutorial we’re going to take a look at some details of this approach and we’re going to implement a real SOAP service using JAX-WS, Maven and the Eclipse IDE.

Finally we’re going to run our service implementation on an embedded Jetty instance and we’re going to take a look at soapUI and how to test our service using this neat tool.

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