Java BatchProperty possible as List<String>?

Question

Is it possible in JSR-352 / Java Batch to have batch properties as List? How would they get initialized from the batch job XML?

public class MyItemProcessor extends ItemProcessor {
 @Inject
 @BatchProperty
 private List<String> items;
 public final Object processItem(Object o) throws Exception {
 ...
 }
}

Here is a skeleton batch job xml:

<?xml version="1.0" encoding="UTF-8"?>
<job xmlns="https://jakarta.ee/xml/ns/jakartaee" version="2.0" id="exportToExcel" restartable="true">
 <chunk item-count="10">
 ...some reader...
 <processor ref="MyItemProcessor">
 <properties>
 <property name="items"/> <-- how would the list of strings go in here?
 </properties>
 </processor>
 ...some writer...
 </chunk>
</job>

Answer 1

Yes. see JBeret examples below. This is specific to JBeret, not a standard feature in Java Batch spec.

https://github.com/jberet/jsr352/blob/main/test-apps/propertyInjection/src/main/java/org/jberet/testapps/propertyinjection/PropertyInjectionBatchlet.java#L215

https://github.com/jberet/jsr352/blob/main/test-apps/propertyInjection/src/main/resources/META-INF/batch-jobs/propertyInjection.xml#L38

See JBeret Docs for more info. The list value can be simple comma-separated string values.

• queeg: It seems the examples parse a single string value to generate lists, dates, etc. Is there some more documentation about it? E.g. what to do if my strings contain commas?
• cheng: commas will be interpreted as delimiter. For such values, it's better to inject them as string value and then parse it.