jmaki dojo and servlet data

[smoczyna]

I have built simple web app with web page containing jMaki table. I'm trying to fill this table wit hthe date from the servlet.
Servlet itselt return following output:

{columns: [
{label: 'Error ID', id: 'errorID'},
{label: 'Error Type', id: 'errorType'}
], rows: [
{errorID: 'Error 1',errorType: 'no type yet'},
{errorID: 'Error 2',errorType: 'no type yet'},
{errorID: 'Error 3',errorType: 'no type yet'},
{errorID: 'Error 4',errorType: 'no type yet'},
{errorID: 'Error 5',errorType: 'no type yet'}
]}

but when I'm replacing the value of the dojo with the path to this servlet I have empty table, neihter VALUE nor SERVICE works and changing servlet output into "text/plain" or "text/json".

What can be wrong here ?