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Check if element node contains no text using java and Xpath?

I am new to Xpath. I am facing a problem that I have to get a boolean response from Xpath, if an element does not contains any text then it should return false otherwise true. I have seen many examples and I don't have much time to learn Xpath expressions. Below is the Xml file.
<?xml version="1.0" encoding="UTF-8" ?>
<order id="1234" date="05/06/2013">
<customer first_name="James" last_name="Rorrison">
<email>j.rorri#me.com</email>
<phoneNumber>+44 1234 1234</phoneNumber>
</customer>
<content>
<order_line item="H2G2" quantity="1">
<unit_price>23.5</unit_price>
</order_line>
<order_line item="Harry Potter" quantity="2">
<unit_price></unit_price>//**I want false here**
</order_line>
</content>
<credit_card number="1357" expiry_date="10/13" control_number="234" type="Visa" />
</order>
Could you point me the right direction to create xpath expression for this problem.
What I want is a expression(dummy expression) as below.
/order/content/order_line/unit_price[at this point I want to put a validation which will return true or false based on some check of isNull or notNull].

The following xpath will do this:
not(boolean(//*[not(text() or *)]))
but this xpath will also include the credit_card node since it to does not contain any text (the attributes are not text()).
if you also want to exclude node with attributes then use this..
not(boolean(//*[not(text() or * or #*)]))
Following your edit, you can do this..
/order/content/order_line/unit_price[not(text()]
It will return a list of nodes with no text and from there you can test against the count of nodes for your test.
or to return true/false..
not(boolean(/order/content/order_line/unit_price[not(text()]))

Why is DOM doing this? (Wrong nodeName XML)

I have this XML (just a little part.. the complete xml is big)
<Root>
<Products>
<Product ID="307488">
<ClassificationReference ClassificationID="AR" Type="AgencyLink"/>
<ClassificationReference ClassificationID="AM" Type="AgencyLink">
<MetaData>
<Value AttributeID="tipoDeCompra" ID="C">Compra Centralizada</Value>
</MetaData>
</ClassificationReference>
</Product>
</Products>
</Root>
Well... I want to get the data from the line
<Value AttributeID="tipoDeCompra" ID="C">Compra Centralizada</Value>
I'm using DOM and when I use nodoValue.getTextContent() I got "Compra Centralizada" and that is ok...
But when I use nodoValue.getNodeName() I got "MetaData" but I was expecting "Value"
What is the explanations for this behaviour?
Thanks!

Your nodeValuevariable most likely points to the MetaData node, so the returned name is correct.
Note that for an element node Node.getTextContent() returns the concatenation of the text content of all child nodes. Therefore in your example the text content of the MetaData element is equal to the text content of the Value element, namely Compra Centralizada.

I guess your are getting the Node object using getElementsByTagName("MetaData"). In this case nodoValue.getTextContent() will return the text content correctly but to get the node name you need to get the child node.

Your current node must be MetaData and getTextContent() will give all the text within its opening and closing tags. This is because you are getting
Compra Centralizada
as the value. You should get the first child using getChildNodes() and then can get the Value tag.

keep only wanted elements in xml with the given list of xpath

I have some complex xml structure. Some times i want to keep only the elements match my runtime list of xpath entries.
Sample xml
<Employee>
<Address>
<addressLine1>Dummy Line 1</addressLine1>
<zip>535270</zip>
</Address>
<Department>
<id>102</id>
<name>development</name>
</Department
</Employee>
Sample xpath entries can be some time like
//Employee/Address
//Employee/Department/
//Employee/Department/name
In the above xpath if you observe we have Department and Name inside department then in that case I can ignore Department.Also above xpath entries can be as below too
//Employee/Address
//Employee/Department/name
Resultant xml i want as below
<Employee>
<Address>
<addressLine1>Dummy Line 1</addressLine1>
<zip>535270</zip>
</Address>
<Department>
<name>development</name>
</Department
</Employee>
I realized I can achieve this through xslt. So I want the xslt for this kind of generic requirement. Also my current code is in java. Is there any better alternative in java??

I have to admit that I do not fully understand your requirements, but what I do see is that:
You have a set of XPath
You seem to want to get the union of these XPath statements if applied to your input document
Duplicates removed (just like XPath union expression)
Some magic about certain elements that may appear even if they are not in the XPath statement list.
My original reflex was: use xsl:evaluate, but considering you are rooting all your XPath expressions, this may not give you the results you want. Also, it requires an XSLT 3.0 processor.
With XSLT 2.0, you could do something like this:
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
exclude-result-prefixes="xs"
version="2.0">
<xsl:strip-space elements="*" />
<xsl:output indent="yes" />
<xsl:variable name="patterns" as="xs:string*">
<xsl:sequence select="(
'foo/bar',
'foo/test',
'foo/bar/zed')" />
</xsl:variable>
<xsl:template match="node()[true() = (
for $p in $patterns
return ends-with(
string-join(current()/ancestor-or-self::*/name(),
'/'), $p))]">
<xsl:copy>
<xsl:apply-templates />
</xsl:copy>
</xsl:template>
<xsl:template match="text()" />
</xsl:stylesheet>
It is just meant to get you started, it is not meant as a full-fledged solution. It matches XPath of the production //QName/QName, like the one in your example. I removed the trailing //, and simply match when the current path matches any of the paths (taking into account an implicit descendent-or-self, as in your example).
You probably want to wrap the for-expression in a function and call the function to map the concatenation of the current path to any of your paths in your list.
In its current form, you will also need to supply the paths leading up to a deeper path, or you will have to implement an fn:snapshot-like function to copy the ancestor nodes as well.
Anyway, I think this is a simple enough approach to mimic not necessarily xsl:evaluate, but mimic pattern matching based on a path, as your question seems to imply.

Getting doc tag names while iterating the elements

i have this XML document:
<?xml version="1.0" encoding="UTF-16"?>
<root>
<items>
<item1>
<tag1>1</tag1>
<tag2>2</tag2>
<tag3>3</tag3>
</item1>
<item2>
<tag1>4</tag1>
<tag2>5</tag2>
<tag3>6</tag3>
</item2>
</items>
</root>
I want to iterate the item elements (item1, item2...), and for each tag get the tag name and after that the value of the tag.
I am using DOM parser.
Any ideas?

Sorry, but this ain't an unsolvable or complicated problem, this is simply reading a tutorial which can be googled within seconds.
And of course, you might also check the documentation, which will give you a hint about this handy method called "getNodeName()".

How to display xml with two parent nodes

How to generate xml using dom parser in java , as shown below
<result>
<schma_index>
<id>8</id>
<name>raja</name>
<schma_index>
</result>
Above should be display like
<Massage>No privilege</Mesaage>
<result>
<schma_index>
<id>8</id>
<name>raja</name>
<schma_index>
</result>

You can't have two root elements in xml. Read about well-formed xml. You can however generate Message and result xml's separately and then concatenate them. However, the parser's can't parse the result xml.

In a "Valid" XML, there can be only one root element. As per this specification:"There is exactly one element, called the root, or document element, no part of which appears in the content of any other element."
So, you have two options:
create two seperate xml files - one containing Message and other results
enclose Message & Results with some other root element:
i.e,
<root>
<Massage>No privillage</Mesaage>
<result>
<schma_index>
<id>8</id>
<name>raja</name>
<schma_index>
</result>
</root>