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Support should be added to the Workbench to allow the user to configure an XMLListConverter on their XMLCompositeDirectCollectionMappings, in order to map to a list of lists. In code this looks like: XMLCompositeDirectCollectionMapping itemsMapping = new XMLCompositeDirectCollectionMapping(); itemsMapping.setAttributeName("items"); itemsMapping.setXPath("item/text()"); itemsMapping.setFieldElementClass(ArrayList.class); itemsMapping.useCollectionClass(ArrayList.class); XMLListConverter listConverter = new XMLListConverter(); listConverter.setObjectClass(Double.class); itemsMapping.setValueConverter(listConverter); See bug 275374 for more information.
The Eclipselink project has moved to Github: https://github.com/eclipse-ee4j/eclipselink