Xpath error null wsimport

Because concat expects a string-type argument, it does any necessary conversion automatically. Earlier in this chapter, in the discussion of name-related node-set functions, I mentioned that the concat function could be used to build an expanded-name for a given element. The starts-with function takes two arguments, returning either the Boolean value true if the first argument starts with the value of the second, or false otherwise.

Like starts-with , the contains function returns a Boolean true or false and, hence, is most commonly used in a predicate. And it too takes two arguments. The value returned by the function is true if the first argument contains the second, or false otherwise. In our sample document, we could extract a node-set consisting of all relics that are chairs using a location path such as:. This would locate a two-node node-set: the relic node representing a beanbag chair and the relic node representing an open-hand chair.

Like most programming languages, XPath provides a substring function for extracting a portion of a larger string. It takes at least two arguments: the larger string from which you want to select a portion and the starting point for the selection.

That is, to select the first character of a string, use:. What happens when the number passed as the third argument exceeds the length of the string in question? All I care to see is that the correct text nodes are showing up in the right places. So I use substring to return, say, just the first five characters of a text node, with an ellipsis. Something like this:. Given the sample XML document used in this section, when iterating through a node-set consisting of all the name elements, this returns a series of substrings such as the following:.

These two functions work very similarly. They each take two arguments: a string from which you want a portion of text extracted and a string where you want the extraction terminated or begun, respectively. This would naturally have to be tweaked in various ways to be perfectly workable. But as a demonstration of the two functions in action, it works just fine. Given a passed string argument, the string-length function returns the number of characters it contains.

This function is sometimes directly useful in its own right. For example, you can use it to tell you whether one string is longer than another apply it to the two strings and compare the two values returned. The issue here is that an XML parser is required to preserve whitespace found in a source document — to pass it unchanged to a downstream application. To normalize content is to remove extraneous whitespace — to trim leading and trailing whitespace from strings such as text nodes and replace multiple successive occurrences of whitespace within a string with a single blank space.

Because if the text content of a document has been hand-entered, you want to be sure that no extra space has crept in as a result of keyboard errors.

This extra space can make comparing one string-value to another fail, even when the two nodes are apparently identical. This is such a big issue in XSLT that the specification includes some of its own facilities for handling such text nodes. For example, there are both xsl:strip-space and xsl:preserve-space elements for identifying the whitespace-only text nodes you want collapsed or preserved, respectively.

The translate function replaces individual characters in one string with different individual characters. The string1 argument is the string whose characters you want to replace; string2 includes the specific characters in string1 that you want to replace; and string3 includes the characters with which you want to replace those string2 characters.

Like normalize-space , the translate function can be valuable in ensuring that two strings are equal, especially when their case — upper vs. Instead of comparing the two strings directly, compare their case-folded values using translate. If string2 is longer than string3 , translate serves to remove characters from string1. Is that a mouse, or what? Here, the translate function itself replaces each occurrence of the exclamation mark, comma, and question mark characters with a blank space; the outer call to normalize-space then squashes all the resulting multiple blank spaces between words into one.

If you need to do this, be sure that the length of string3 — the blank spaces — matches the number of characters in string2 exactly. As the term implies, the XPath Boolean functions all return Boolean true or false values. These functions are all quite simple, with few little gotchas or complications. But following Table , which summarizes the Boolean functions, I will provide discussion and examples of each.

Returns true if boolean is false, and false if boolean is true. Returns true or false, depending on whether the language in which the context node is presented matches the value of the string argument. Also like the string function, you will almost never need to use boolean explicitly: in contexts particularly predicates where a logical true or false is expected, the anytype argument will be converted implicitly, according to the type string, numeric, node-set, or Boolean of the argument.

Thus, each of the following subsections describes these implicit conversions as well as the result of explicit calls to boolean. If anytype is at least one character long, the call to boolean returns true; otherwise, it returns false. Thus, the following two XPath expressions are functionally identical the value true :.

Remember that a text node may consist entirely of whitespace, as discussed earlier. When anytype is numeric. A call to boolean with a numeric argument returns true if the argument is a legitimate number i. This positive-or-negative-zero business is consistent with Java and other specifications, although it seems to fly in the face of common sense. What does it mean when a number is both positive and zero, or both negative and zero? In discussing the behavior of boolean with a string argument, I showed you two expressions that produced the same result.

To these two we can now add a third:. The nested call to string-length returns a number, which is then passed to boolean. If the number passed is 0 — that is, if the string is empty — boolean returns false, otherwise true. For example:. This form of the predicate is essentially a shortcut for using the boolean function with a node-set argument. It returns true if the node-set has at least one member, or false otherwise.

That is, the following is equivalent to the short form just presented:. When anytype is a Boolean value. If anytype is itself a Boolean value, the value returned by boolean is identical to the value of anytype itself.

If anytype is true, boolean returns true; if false, it returns false. The not function simply flips the value of its passed argument. If the value of boolean is true, not returns false and vice versa. Many comparison operations in XPath look and behave peculiarly, and a particular trap to watch out for when using not is how it behaves differently from the!

Consider the following two location paths:. This employee element will not be located by the first example, because it has no id attribute at all; it will be located by the second example, though, because it has no id attribute with a value of emp These two Boolean functions are of rather limited utility.

You pass them no arguments, and they always return the Boolean value corresponding to their names: true always returns the value true, and false always returns false. Maybe the most common use of true and false , though, is in XSLT.

You can pass parameters to a named template in a manner similar to passing arguments to a function; if the named template is driven by parameters whose values it expects to be true or false, the simplest way to pass it either of those values is with the true or false function. Use of this function depends on the use of an xml:lang attribute either directly, in an instance document, or indirectly, via its DTD.

If there is no such attribute in scope at the point of the call to lang , the function returns false. Consider this code fragment:. Assuming that this element or its text-node child is the context node, the following function call returns true:.

More subtly, lang also returns true in a case- in sensitive way; you could also use:. They can also specify sublanguages, or language groups, using a hyphen to separate the major language code from the one for the sublanguage.

The inverse is not true. Numeric functions operate on their arguments to produce numeric results. Table summarizes these functions; each is discussed separately following the table. Returns the sum of all nodes in nodeset , after converting each to a number. Returns the smallest integer that is greater than or equal to number. Returns the integer nearest in value to number rounds up if number has a decimal portion of. Like the string and boolean functions discussed earlier, number converts an optional argument to some basic XPath data type — numeric, in this case — based on the data type of the passed argument.

To be converted to a number, a string argument must consist of optional whitespace, followed by an optional minus sign - , followed by the numeric value itself, followed by optional whitespace. Any other kind of string is converted to the special value NaN. If the Boolean value is true, the value returned by number is 1; if false, number returns 0. Thus, in this location step:.

In this case, the argument is first converted to a string as if it had been passed to the string function discussed earlier in this chapter, and then converted to a number according to the rules for converting strings to numbers. This follows common sense; using the sample XML document in this section, for example, this expression:. Passing the number function a numeric argument simply returns the value of that argument. You can do simple summations across a node-set using the sum function; just pass it the node-set in question.

Each node is first converted to a number using the rules of conversion laid out for the number function, then the summation is performed.

We could sum up the values of all the weight elements in the sample document with an expression like:. Applied to our sample document, this expression:. Any node failing the numeric test is sufficient to produce a NaN result.

The floor and ceiling functions perform similar operations on their arguments. Both return integers nearest in value to that of the argument. For floor , the result is the largest integer less than or equal to the argument; for ceiling , the smallest integer greater than or equal to the argument. Note that these are not exactly rounding-down and up functions.

If so, floor returns the integer portion of the argument and ceiling , the integer portion plus 1. If not, floor and ceiling both return the same result: the integer portion of the argument. Be careful when using floor and ceiling with negative arguments.

It is the direct way to find the element, but the disadvantage of the absolute XPath is that if there are any changes made in the path of the element then that XPath gets failed. It can search elements anywhere on the webpage, means no need to write a long xpath and you can start from the middle of HTML DOM structure. Relative Xpath is always preferred as it is not a complete path from the root element.

Below is the example of a relative XPath expression of the same element shown in the below screen. This is the common format used to find element by XPath. XPath axes search different nodes in XML document from current context node. Axes methods are used to find those elements, which dynamically change on refresh or any other operations. There are few axes methods commonly used in Selenium Webdriver like child, parent, ancestor, sibling, preceding, self, etc.

XPath expression select nodes or list of nodes on the basis of attributes like ID , Name, Classname , etc. Contains is a method used in XPath expression. It is used when the value of any attribute changes dynamically, for example, login information.

The contain feature has an ability to find the element with partial text as shown in below XPath example. In this example, we tried to identify the element by just using partial text value of the attribute.

It can be observed that the element is found successfully. In OR expression, two conditions are used, whether 1st condition OR 2nd condition should be true. It is also applicable if any one condition is true or maybe both.

Means any one condition should be true to find the element. In the below XPath expression, it identifies the elements whose single or both conditions are true. In AND expression, two conditions are used, both conditions should be true to find the element. It fails to find element if any one condition is false.

Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Asked 6 years, 6 months ago. Active 6 years, 6 months ago.

Viewed times. I have created a jaxb bindings file to name explicitly the resulting Java class. Please help to figure out why the wsimport says that the xpath is null. Thank you in advance! Improve this question.

If you post an answer I will accept it. You should prefer the standard prefixes xs or xsd for that namespace, instead of using s , which will likely confuse people. Note that the prefix in your xpath doesn't need to match the prefix in the wsdl, they just have to be bound to the same namespace URN. Add a comment.