The Jenkins Build and Delivery Pipeline plugins

Continuous Delivery (CD) is a design practice used in software development to automate and improve the process of software delivery (http://en.wikipedia.org/wiki/Continuous_delivery). Continuous delivery uses the notion of a deployment pipeline in order to validate code. At an abstract level, a deployment pipeline is an automated manifestation of your process for getting software from version control into the hands of your users (http://www.informit.com/articles/article.aspx?p=1621865&seqNum=2). How can such a deployment pipeline be implemented?

In this blog post I'll describe the setup of my environment and my first experience with the Jenkins/Hudson Build and Delivery Pipeline plugins. What it can do to help implement a deployment pipeline and what it won't do for you.

(https://wiki.jenkins-ci.org/display/JENKINS/Build+Pipeline+Plugin)

(https://wiki.jenkins-ci.org/display/JENKINS/Delivery+Pipeline+Plugin)

Using the Java embedding activity in BPEL to gain more Composite information and control

Java can be used to extend functionality provided in Oracle SOA Suite BPEL. For example to interface with technologies for which there is no adapter available or to provide more specific functionality as is provided by the standard available activities. In this blog post I'll describe an example of how a composite can control its own state by using Java embedded code.

This mechanism can for example be used in exception handling implementations to retire a composite in case of errors.

Oracle SOA fault handling with ordered guaranteed delivery using BPEL, JMSAdapter, custom JMS headers, JMS message selectors, a JMS topic and durable subscribers

In this blog post I will demonstrate an error handling mechanism which can be used to achieve guaranteed delivery of messages in a specific order. To implement this I have used Oracle SOA Suite 11g, BPEL 2.0. The method described however can also be implemented by other technologies/languages. The method used is different from (as far as I know) previously described methods to implement exception handling in Oracle SOA Suite. A single JMS topic is used and JMS message selectors based on custom JMS headers are used by clients. By using a JMS topic, the services are loosely coupled. This method also allows tracing of flows over the topic in the Enterprise Manager Fusion Middleware Control (when Oracle SOA Suite is used). A screenshot of this mechanism implemented is shown in the screenshot below. It will be explained in more detail below.

JAXB and XML generation; missing elements

The Java API for XML Binding, JAXB (https://jaxb.java.net/) is a framework often used in Java to make working with XML easier. Most modern Java IDE's (such as JDeveloper, Eclipse, Netbeans) support direct generation of Java classes from an XML schema definition. JAXB allows Java code to be marshalled to XML and XML to be unmarshalled to Java classes.

If you generate Java classes from an XML schema definition, create an instance of the generated class and unmarshall it to XML, the XML will not in all cases be compliant to the schema the classes were generated from. This can cause problems if correctness is assumed based on usage of the framework. Validation can help detect problems and there are several methods to circumvent them.

JDBC from the Oracle Service Bus

There are different ways to do database calls from the Oracle Service Bus. In this blog post I look at several methods.

The methods looked at;
1 using an external webservice (without OSB)
2 using an external webservice proxied by the OSB

3 using the fn-bea:execute-sql function from the OSB

4 using the JCA DbAdapter from the OSB provided by Oracle as part of Oracle SOA Suite

JasperReports: Quickly generate and customize reports

For a small company I had created an Oracle APEX application. They wanted to create reports from an underlying database (in order to send invoices). Oracle APEX has the option of creating interactive reports (http://www.oracle.com/technetwork/developer-tools/apex/application-express/irrs-083031.html). These reports can be exported to several formats (e.g. CSV, PDF, HTML).

The customer is a small company so commercial products were not an option. The customer wanted to customize/layout the generated reports. The time available to develop a solution was very limited. After development, the customer needed to be able to make small layout changes independent of the developer (since the developer had other things to do). I first looked at the standard APEX Apache FOP implementation. Then I decided to take a look at JasperReports. The below image displays a report which was created in just a couple of minutes based on data from the sample HR schema present in most Oracle databases.

First steps into the Oracle Database Cloud

Oracle provides a Database Cloud Service. In a previous post I've looked at the Oracle Java Cloud Service (http://javaoraclesoa.blogspot.nl/2013/12/first-steps-into-oracle-java-cloud.html). The database is of course also an important component used in most applications. In this blog post I'll describe my first experiences with the Oracle Database Cloud service. I've used two methods to connect to the Oracle Database Cloud service. The first one from SQLDeveloper. Next I created a webservice, deployed it to the Oracle Java Cloud service and fetched data from the Oracle Database Cloud service with it.

There are of course other methods to interact with the Oracle Database Cloud service. It is for example possible using SQLWorkshop from the Apex interface to expose RESTful services to access the database. See for example http://multikoop.blogspot.nl/2012/11/oracle-java-and-database-cloud-services.html on how to create these services. By default, calls to the Oracle Cloud are encrypted. See https://weblogs.java.net/blog/bleonard/archive/2013/05/02/calling-oracle-cloud-service-java on how to call services.