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Adding weld-dev.<br>
<br>
Hi Cheng,<br>
<br>
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?<br>
<br>
Jozef<br>
<br>
<div class="moz-cite-prefix">On 03/07/2015 05:54 PM, Cheng Fang
wrote:<br>
</div>
<blockquote cite="mid:54FB2D34.5090005@redhat.com" type="cite">
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Hi Jozef,<br>
<br>
I'm having a question in using CDI injection in project JBeret
(batch impl project), and would appreciate any help from you.<br>
<br>
A batch application (in Java SE or EE) can inject configured batch
properties into batch artifact classes:<br>
<br>
@Inject<br>
@javax.batch.api.BatchProperty(name = "batchPropName")<br>
String batchPropName = "default name";<br>
<br>
The property value comes from job.xml, which is the batch job
definition descriptor file:<br>
<br>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<batchlet ref="batchlet1"><br>
<properties><br>
<property name="batchPropName" value="configured
name"/><br>
</properties><br>
...<br>
<br>
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. <br>
<br>
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.<br>
<br>
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.<br>
<br>
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?<br>
<br>
Thanks,<br>
Cheng<br>
<br>
[1]
<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="https://github.com/jberet/jsr352/blob/master/jberet-core/src/main/java/org/jberet/creation/BatchCDIExtension.java">https://github.com/jberet/jsr352/blob/master/jberet-core/src/main/java/org/jberet/creation/BatchCDIExtension.java</a><br>
<br>
[2]
<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="https://github.com/jberet/jsr352/blob/master/jberet-core/src/main/java/org/jberet/creation/BatchBeanProducer.java">https://github.com/jberet/jsr352/blob/master/jberet-core/src/main/java/org/jberet/creation/BatchBeanProducer.java</a><br>
<br>
<br>
</blockquote>
<br>
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