OSGi Applications: Known restrictions

There are a small number of known restrictions that apply when working with OSGi Applications.

List of known OSGi Applications issues and restrictions

• Blueprint bean implementation classes cannot be final
• We cannot deploy a V8.5 OSGi application to a V8.0 WAS

Blueprint bean implementation classes cannot be final

The following Blueprint XML example code declares a Blueprint-managed bean, which is backed by an instance of the com.acme.MyBeanImpl implementation class. This class is defined in com.acme.MyBeanImpl.java:

<bean id="beanId" class="com.acme.MyBeanImpl">
  <property name="logger" ref="loggingService"/>
</bean>

In this example, the com.acme.MyBeanImpl implementation class is subject to the following restrictions:

• It cannot be declared final.
• It cannot be declared as an enumeration because this process also makes the class final.
• It cannot contain any final methods.

In your code, none of the Blueprint bean implementation classes can be final. If we specify a Blueprint bean implementation class that is final, we get an exception message similar to the following message:

[16/03/10 15:38:16:906 GMT] 00000013 BlueprintCont E
org.apache.aries.blueprint.container.BlueprintContainerImpl doRun
Unable to start blueprint container for bundle
com.ibm.componenttest.logging
org.osgi.service.blueprint.container.ComponentDefinitionException:
Unable to proxy bean for interceptors:
org.apache.aries.blueprint.proxy.FinalModifierException
at org.apache.aries.blueprint.proxy.AsmInterceptorWrapper.
   createProxyObject(AsmInterceptorWrapper.java:148)
at org.apache.aries.blueprint.container.BeanRecipe.
   addInterceptors(BeanRecipe.java:651)
at
...

We cannot deploy a V8.5 OSGi application to a V8.0 WAS

If we attempt to deploy an OSGi application that includes V8.5 features to a V8.0 WebSphere Application Server, the deployment fails with an exception.

For example, if the source code refers to an enterprise bean using an @EJB annotation, the bean injection fails during application deployment.

Related:

JMS and OSGi Applications

Developing an OSGi application

Develop applications that use the Java Persistence API

OSGi Service Platform Release 4 Version 4.2 Enterprise Specification

Migrate and coexisting for OSGi applications

File name: was1529.html

prettyPrint();