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ADF DVT: Using the Timeline component to visualize the recent history of an RSS feed

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2 months ago
by Lucas Jellema in , ,

One recurring theme in my articles on ADF has been that end users usually do not care about data. They are interested in getting information that helps them answer questions, make decisions and take actions. Data may be the foundation, but information is to be derived from the data. One way therefore to create applications that are more valuable to our end users is by preprocessing data and turning the data into information – or even into answers, proposed decisions and actions. A powerful way of turning data into information is through data visualization. By presenting data in a format that converts it to readily interpretable information, we help our users a lot. Bar charts, line graphs and other traditional charting formats are one of way visualizing data. The DVT library in ADF Faces goes far beyond traditional charts. It provides components such as the Gantt Chart, the Hierarchy Viewer, the Tree Map, Gauge and the TimeLine that help visualize data in natural, informative and attractive ways. This articles discusses the TimeLine component – introduced in ADF 11gR1 PS6 (11.1.1.7) in the Spring of 2013.

The TimeLine visualizes events against a time axis. It is as simple as that. More >

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Turning any XML document into a Java Object graph using JAXB 2.0

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1 year ago
by Lucas Jellema in , , ,

As a followup to my recent article on how to Produce and XML document based on data in a POJO structure using JAXB (http://technology.amis.nl/blog/12499/creating-an-xml-document-based-on-my-pojo-domain-model-how-will-jaxb-help-me) I will describe in this article how to go the reverse route: how to take any XML document and process it into a Java Object graph. I will do that using JAXB.

The steps described in this article are:

  • create XSD based on the XML document that I want to turn into Java objects
  • generate a JAXB Java class structure based on the XSD
  • use JAXB to unmarshall the XML document from file or URL into the Java objects
  • retrieve information from the POJOs that are instantiated by the unmarshalling

The tool I use in this article is JDeveloper 11g. However, everything is based on standard technology and will work anywhere (except for the creation of the XSD based on an XML, that is a specific XML IDE feature).

(more…)

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Create XSD from XML instance document – new JDeveloper 11gR1 feature

3 years ago
by Lucas Jellema in , , ,

 

While looking into the XML functionality in JDeveloper 11g, I came across a feature that was added in the 11.1.1.1.0 release – July 2009: [Create] XML Schema from XML Document. Functionality previously found in commercial products such as XMLSpy, that enables us to make a head start with the development of XML Schema Definitions by using an existing XML Document as starting point.

In this article, I will very briefly demonstrate what this functionality allows us to do. And what its current limitations are.

In short: we can indicate an XML document and have an XSD created that derives its element, type and attribute definitions from the actual XML content in that document. Most XML documents do not represent the entire set of restrictions and freedom that the XSD will describe, so the generated XSD is only a starting point – but a very useful one all the same.

At this moment, the XML source document has to exist on the file system (we cannot feed the tool with a URL). The created XSD document does not work well with multiple namespaces – as well will see in this example. The tool does not create named (complexTypes) – only (nested) elements. It does create, when so requested, More >

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