Under Felix/OSGi, errors when adding BPMN2 resource: Failed to read schema document 'BPMN20.xsd'

(null: 13, 54): schema_reference.4: Failed to read schema document 'BPMN20.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.
(null: 13, 54): cvc-elt.1: Cannot find the declaration of element 'definitions'.
(null: 15, 58): schema_reference.4: Failed to read schema document 'BPMN20.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.
(null: 16, 98): schema_reference.4: Failed to read schema document 'BPMN20.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.
(null: 18, 149): schema_reference.4: Failed to read schema document 'BPMN20.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.
(null: 20, 24): schema_reference.4: Failed to read schema document 'BPMN20.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.
(null: 24, 53): schema_reference.4: Failed to read schema document 'BPMN20.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.
(null: 25, 69): schema_reference.4: Failed to read schema document 'BPMN20.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.
(null: 28, 47): schema_reference.4: Failed to read schema document 'BPMN20.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.
(null: 29, 43): schema_reference.4: Failed to read schema document 'BPMN20.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.
(null: 30, 15): schema_reference.4: Failed to read schema document 'BPMN20.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.
(null: 32, 35): schema_reference.4: Failed to read schema document 'BPMN20.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.
(null: 33, 36): schema_reference.4: Failed to read schema document 'BPMN20.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.
(null: 37, 62): schema_reference.4: Failed to read schema document 'BPMN20.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.
(null: 38, 62): schema_reference.4: Failed to read schema document 'BPMN20.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.

private StatefulKnowledgeSession ksession;

public OsgiBpmRepository(KnowledgeBuilderFactoryService kbuilderFactory,
		KnowledgeBaseFactoryService kbaseFactory,
		ResourceFactoryService resourceFactory) throws IOException {
	KnowledgeBuilderConfiguration kbuilderConfig = 
			kbuilderFactory.newKnowledgeBuilderConfiguration(null, getClass().getClassLoader());
	KnowledgeBuilder kbuilder = kbuilderFactory.newKnowledgeBuilder(kbuilderConfig);
	final String resourceName = "META-INF/hello.bpmn";
	log.info("Loading classpath resource {}", resourceName);
	kbuilder.add(resourceFactory.newClassPathResource(resourceName, getClass()),
			ResourceType.BPMN2);
	
	KnowledgeBaseConfiguration kbaseConfig = 
			kbaseFactory.newKnowledgeBaseConfiguration(null, getClass().getClassLoader());
	KnowledgeBase kbase = kbaseFactory.newKnowledgeBase(kbaseConfig);
	kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());

	ksession = kbase.newStatefulKnowledgeSession();
}