Re: [weld-dev] How to skip CDI injection if a property is not configured in batch application?

Adding weld-dev. Hi Cheng, by defining a producer method you are basically saying "I am able to supply an object for this given type/qualifier combination". There is not way to opt out of it at runtime. Are you concerned about the JVM default values or the default values a user has provided? Jozef On 03/07/2015 05:54 PM, Cheng Fang wrote: > Hi Jozef, > > I'm having a question in using CDI injection in project JBeret (batch > impl project), and would appreciate any help from you. > > A batch application (in Java SE or EE) can inject configured batch > properties into batch artifact classes: > > @Inject > @javax.batch.api.BatchProperty(name = "batchPropName") > String batchPropName = "default name"; > > The property value comes from job.xml, which is the batch job > definition descriptor file: > > <batchlet ref="batchlet1"> > <properties> > <property name="batchPropName" value="configured name"/> > </properties> > ... > > When "batchPropName" property is not configured in job.xml, the > injection should not happen, and whatever java default field value > should be preserved for batchPropName field. > > With our current batch CDI extension [1] and producer bean [2], it > injects a null value into this field, overwriting the java default > value, when the target batch property is not present. > > How to signal to Weld to skip performing the injection for those > injection targets? Ideally, I hope it can be done from within > producer methods, which is the place we retrieve batch properties and > know whether they exist or not. > > I think this is also how Java EE field injection works. How do we > handle it in EE, and is it something I can mirror? > > Thanks, > Cheng > > [1] > https://github.com/jberet/jsr352/blob/master/jberet-core/src/main/java/or... > > [2] > https://github.com/jberet/jsr352/blob/master/jberet-core/src/main/java/or... > > _______________________________________________ weld-dev mailing list weld-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/weld-dev