You should better describe your symptoms. JUnit-style XML report is the basic form of test report supported by Jenkins/Hudson, so I suppose the problem is relatively simple. Please compare your configuration with the following example:
I would suggest the following:
- Check you configuration (it is likely jenkins is not able to find the actual report file)
- Look through the console output to make sure there is no warning message related to XML report file
- Verify XML report is not empty and valid
- Try to use JUnitReport tasks to generate HTML form
- Finally, switch to TestNG if you can