PartitionPlan.getThreads() returning zero value causes batch job not be started

Create a simple batch application. Define and write a PartitionMapper returning a PartionPlanImpl object, but don't override getThreads method. For example: package batchtest; import java.util.Properties; import javax.batch.api.partition.PartitionMapper; import javax.batch.api.partition.PartitionPlan; import javax.batch.api.partition.PartitionPlanImpl; import javax.enterprise.context.Dependent; import javax.inject.Named; @Dependent @Named("TestPartitionMapper") public class TestPartitionMapper implements PartitionMapper { @Override public PartitionPlan mapPartitions() throws Exception { return new PartitionPlanImpl() { @Override public int getPartitions() { return 2; } // getThreads() is not overridden // Defaults to zero, which means thread count // should be equal to partition count @Override public Properties[] getPartitionProperties() { Properties[] props = new Properties[getPartitions()]; props[0] = new Properties(); props[1] = new Properties(); return props; } }; } } Then try to start the batch job. Number of threads should be equal to number of partitions, but the batch job don't start in WildFly. In GlassFish the batch job is started in 2 threads as expected.