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

There is an easy trick though which we do at BatchEE: The producer is @Dependent. So you can simply inject the InjectionPoint and inspect the current value in case it is not yet set. LieGrue, strub > Am 09.03.2015 um 07:25 schrieb Jozef Hartinger <jharting(a)redhat.com&gt;: > > 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 _______________________________________________ cdi-dev mailing list cdi-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/cdi-dev Note that for all code provided on this list, the provider licenses the code under the Apache License, Version 2 (http://www.apache.org/licenses/LICENSE-2.0.html). For all other ideas provided on this list, the provider waives all patent and other intellectual property rights inherent in such information.