OpenJPA Entity Enhancement in OSGI container

Introduction

In this example we will see how to enhance the JPA entities before usage in OSGi container.

Let's assume we got an entity called Person. 

Maven Dependencies

Maven Plugin

Using External Properties in Apache Karaf [Fuse ESB]

Introduction

In this example we will see how to use an external property file in Fuse ESB / Apache Karaf.

Creating a configuration file

Create a config file named sample.cfg in FUSE_HOME/etc with the following content.

Spring Configuration

Blueprint 

Note : The default blueprint placeholder syntax (accessing the blueprint properties directly) is ${Key}. Hence, outside the scope of a camelContext element, the placeholder syntax you must use is ${Key}. Whereas, inside the scope of a camelContext element, the placeholder syntax you must use is {{Key}}.

Camel Route

Injecting OSGi Service Registry in Spring Context

Introduction

In this example we will inject a OSGi service registry inside a Spring Context.

OSGi Service Registry

Let's assume we got a Oracle datasource in our OSGi container with the following service description. (Please see this link)

Spring Configuration

1. Add the OSGi namespace in your Spring context.

2. Using the osgi:reference to get the datasource object.

Oracle Datasource in Fuse ESB / Apache Karaf

Creating a Oracle data-source in Fuse ESB [Apache Karaf]


1. Create a blueprint xml file as shown below -

datasource-oracle.xml




2. Installing the Oracle Driver in Karaf console

install -s wrap:mvn:com.oracle/ojdbc6/11.2.0

Note: Please make sure you've got the Oracle Driver in your local/remote maven repository. If you don't have it please install with the following maven command -

mvn install:install-file -Dfile=ojdbc6.jar -DgroupId=com.oracle \
    -DartifactId=ojdbc6 -Dversion=11.2.0 -Dpackaging=jar

2. Deploy it on the Fuse ESB server

Copy the datasource-oracle.xml in the FUSE ESB deploy folder ( e.g. %FUSE_SERVER%/deploy )

Setting System properties using Spring

Approach 1 :

Approach 2 : Suggested by Sam Mohamed