Sti's blog

“You don’t currently have permission to access this folder” – this error happens sometimes on my Windows 7 machine – seemingly in conjunction with cygwin – somehow the ownership of folders/directories gets broken.

Here’s the command to fix this quickly – run as administrator via cmd:

for /D %f in (*) do takeown /R /D Y /f %f

It loops through all directories within the current directory, and takes ownership of the folders (the /R is for recursion, the /D Y (Y will be J on German-language windowses, and the last part just specified that it concerns the folder that’s the current one in the for loop)

Recently (with Grails 2.4.2) an exception popped up in the logs

Caused by: org.codehaus.groovy.grails.web.servlet.mvc.exceptions.ControllerExecutionException: 
Error creating URL for parameters [{language=en, id=256, controller=gallery, action=ajaxLoadMoreDesigns}], 
problem encoding URL part [en]: 'UTF-8'
..
Caused by: java.io.UnsupportedEncodingException: 'UTF-8'
        at java.net.URLEncoder.encode(URLEncoder.java:215)
        ... 9 more

for which there was not really an explanation/fix around google. Looking twice, it turns out the quotes (around UTF-8) are the problem causing the encoding lookup to fail. The exception is caused in RegexUrlMapping.groovy which in the end gets the encoding from the request in ApplicationTagLib.groovy:

String generatedLink = linkGenerator.link(urlAttrs, request.characterEncoding)

It’s easily reproduced like this:

import groovyx.net.http.RESTClient

def client = new RESTClient("http://localhost:8080")
client.get(path: '/', headers: ['Content-Type': "text/xml; charset='UTF-8'"]) //quotes around charset here

And there’s also an easy workaround – clean up the encoding in a Grails filter:

//workaround for some browsers/clients sending quoted encoding values which breaks link generation
if (request.characterEncoding) {
   request.characterEncoding = request.characterEncoding.replace("'", "").replace("\"", "")
}