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Microsoft JScript runtime error: Object doesn't support this property or method.

Yesterday I spent two hours analyzing this issue, which of course I had only with Internet Explorer…

As the background: I wrote a library that would make a table sortable and paginable. I decided to use prototype.js and I tried to test the result not only in Firefox which I use by default, but then I simply forgot… Then, …

Reporting Services – problem with passing parameters directly in the URL

In one of the projects I had to create reports (using Reporting Services) that then should be accessible from the application I’ve been developing.

As the first thing I created the reports themselves (RDL files), deployed them using the Report Manager (more often http://localhost/Reports or http://localhost/Reports$SQLExpress), and configured so I could access them. However, each time I accessed a …

Terminal server has exceeded maximum number of allowed connection – how to kill open sessions?

When you RDC (connecting remotely using Remote Desktop Connection) to a server and get “Terminal server has exceeded maximum number of allowed connection” message there’s still light at the end of the tunnel.

Solution (tested on Windows 2003)

RDC to another server in the same workgroup as the one you cannot access and go to Administrative Tools / Terminal Services

Reporting Services – deploying RDL files

In this post I’ll describe how to deploy RDL files using Report Manager (more often http://localhost/Reports or http://localhost/Reports$SQLExpress).
Note: This description applies to the situation where Microsoft SQL Server is used.

  1. Go to Report Manager
  2. Too keep all clean, you can create a folder in which you will keep all your reports
  3. Create the data source, if not yet

System.Net.WebException: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.

One of my applications was supposed to use image having its URL. The Image was instantiated with the stream the server that stored the image file responded with after being requested as below:

// create a request for image
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(IMAGE_URL);
request.Method = "GET";
request.ContentType = "multipart/form-data";
request.UserAgent = "Mozilla/4.0+(compatible;+MSIE+5.01;+Windows+NT+5.0";
request.Proxy.Credentials = CredentialCache.DefaultCredentials;
request.Credentials = CredentialCache.DefaultCredentials;

// get 

Exception – ORA-00604: error occurred at recursive SQL level 1 ORA-01003: no statement parsed

In my application data were collected from database (Oracle) using web services that called stored procedures. One of the stored procedure had SELECT defined similar to the one below:

WITH sth1 as 
        SELECT ...
sth2 as 
        SELECT ...

This construction was the reason why in my application I was getting the following exception while …

How to wait until AJAX call completes in Selenium tests

If you introduce AJAX to the application that is web tested with Selenium your tests might fail from time to time. In my case the tests were failing randomly, not that often but it made their quality decreased. So, how can you fix this?


Ideally, what you need is to stop the test execution (e.g. do not perform checks …

Collection classes in Java

Collections are very important on SCJP exam. It’s useful to remember the following…



  • ordered (index)
  • duplicates allowed


  • fast iteration
  • fast random access; as of Java 1.4 implements RandomAccess interface
  • slower instertion and deletion


  • the same as ArrayList but its metods are synchronized (therefore slower)


  • elements are doubly linked to one another; linkage adds methods that allow

Assertions in Java

assert Expression1 : Expression2;
  • Expression1 is asserted to be true; otherwise AssertionError (that shouldn’t be handled) is thrown
  • Expression2 allows to produce some additional information
  • Expression2 MUST result in a value – it generates a String message
  • allow testing during the development and debugging
  • are disabled at runtime by default
  • can be enabled using -ea or -enableassertions flags and selectively

High Performance Web Sites

Recently I’ve been reading “High Performance Web Sites” (look at amazon).

I think it’s a good book who can be recommended to all who do even little bit of front end development. The book describes 15 rules (regarding CSS, JavaScript, etc.) that should be followed in order to deliver high performance web sites. It’s rather short (c.a. 150 pages) and …