Skip to main content
A
Anonymous
May 30, 2008
Question

getting the ServletContext in CF

  • May 30, 2008
  • 1 reply
  • 681 views
I am trying basically to interact with a Java class file installed under WEB-INF/classes. I want to pass the ServletContext for cf to my new class when I instantiate an object from it.

What I wanted to do was to create an instance of my class through <cfobject> and then use init(getPageContext.getServletContext).

So I used:

<cfscript>
cfServlet = getPageContext().getServletContext();
url_mappings = CreateObject("java", "com.dev.myFilter.UrlMapper");
</cfscript>

Then I went to initialize this new object and pass the ServletContext into it:

url_mappings.init(cfServlet).

This returns an error because (as I soon discovered) the object "cfServlet" gotten from the first line is of class "coldfusion.runtime.ServletContextWrapper", and my Constructor method for my class is designed to handle a ServletContext object.

I also tried making a constructor method that takes argument of time coldfusion.runtime.ServletContextWrapper, but I still got an error in CF that there are no constructor methods designed to handle argument of type coldfusion.runtime.ServletContextWrapper, which is wierd!

In my class file I have these 2 constructor methods as a test, so that I am explicitly handling ServletContextWrappers:

UrlMapper(ServletContextWrapper servletcontextwrapper) {
this.ReadFile();
}

// Constructor w/out filename arg
UrlMapper(ServletContext servletcontext) {
UrlMapper.servletcontext = servletcontext;
this.ReadFile();
}

But this still throws an error in my CFM template!

"Unable to find a constructor for class com.webworld.filter.UrlMapper that accepts parameters of type ( coldfusion.runtime.ServletContextWrapper ). "

Is there any way to get around this, either in CF by casting this ServletContextWrapper object to a ServletContext, or by simply getting the actual ServletContext?

--- Thanks
    This topic has been closed for replies.

    1 reply

    -
    -__cfSearching__-
    Inspiring
    June 14, 2008
    I am unclear on your ultimate goal. However, you should have no problem passing in the CF ServletContext to your class, since the coldfusion.runtime.ServletContextWrapper class implements the javax.servlet.ServletContext interface. Passing in the servletContext as you described works fine for me with CF8

    <cfscript>
    cfServlet = getPageContext().getServletContext();
    url_mappings = CreateObject("java", "com.dev.myFilter.UrlMapper");
    url_mappings.init(cfServlet);
    </cfscript>

    import javax.servlet.ServletContext;


    public class UrlMapper {
    //... declare variables

    public UrlMapper(ServletContext servletcontext) {
    //... etc
    }

    }

    I would verify the class constructors are accessible (ie public). You may also need to restart CF, to ensure sure it is using the correct version of your class. For that reason, I usually add a version number to my classes. It eliminates the guesswork.

    Terms & ConditionsAccessibility statement
    Using the community Terms of use Privacy Cookie preferences Do not sell or share my personal information ad choicesAdChoices