This method accepts webelement as parameter and returns absolute XPath string.

getAbsoluteXPath.java

public static String getAbsoluteXPath(WebElement element){
   return (String) ((JavascriptExecutor) driver).executeScript(
    	"function absoluteXPath(element) {"+
		  "var comp, comps = [];"+
			"var parent = null;"+
			"var xpath = '';"+
			"var getPos = function(element) {"+
			"var position = 1, curNode;"+
			"if (element.nodeType == Node.ATTRIBUTE_NODE) {"+
			"return null;"+
			"}"+
			"for (curNode = element.previousSibling; curNode; curNode = curNode.previousSibling) {"+
				"if (curNode.nodeName == element.nodeName) {"+
					"++position;"+
				"}"+
			"}"+
			"return position;"+
			"};"+

			"if (element instanceof Document) {"+
				"return '/';"+
			"}"+

			"for (; element && !(element instanceof Document); element = element.nodeType == Node.ATTRIBUTE_NODE ? element.ownerElement : element.parentNode) {"+
			"comp = comps[comps.length] = {};"+
			"switch (element.nodeType) {"+
			"case Node.TEXT_NODE:"+
				"comp.name = 'text()';"+
				"break;"+
			"case Node.ATTRIBUTE_NODE:"+
				"comp.name = '@' + element.nodeName;"+
				"break;"+
			"case Node.PROCESSING_INSTRUCTION_NODE:"+
				"comp.name = 'processing-instruction()';"+
				"break;"+
			"case Node.COMMENT_NODE:"+
				"comp.name = 'comment()';"+
				"break;"+
			"case Node.ELEMENT_NODE:"+
				"comp.name = element.nodeName;"+
				"break;"+
			"}"+
			"comp.position = getPos(element);"+
			"}"+

			"for (var i = comps.length - 1; i >= 0; i--) {"+
				"comp = comps[i];"+
				"xpath += '/' + comp.name.toLowerCase();"+
				"if (comp.position !== null) {"+
				"xpath += '[' + comp.position + ']';"+
				"}"+
			"}"+
			"return xpath;"+

		"} return absoluteXPath(arguments[0]);", element);
	}