#vulnerable code 
                             @Test
	public void parseXml_uri() {
		ICalParameters params = new ICalParameters();

		Element element = xcalPropertyElement(marshaller, "<uri>http://example.com/image.png</uri>");
		Result<Attachment> result = marshaller.parseXml(element, params);

		Attachment prop = result.getValue();
		assertEquals("http://example.com/image.png", prop.getUri());
		assertNull(prop.getData());
		assertWarnings(0, result.getWarnings());
	} 
                            #location 6 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                             @Test
	public void parseXml_uri() {
		Result<Attachment> result = parseXCalProperty("<uri>http://example.com/image.png</uri>", marshaller);

		Attachment prop = result.getValue();
		assertEquals("http://example.com/image.png", prop.getUri());
		assertNull(prop.getData());
		assertWarnings(0, result.getWarnings());
	}