Grails Response Writer does not allow use of leftShift() method (<<)

In controller response.writer, of type GrailsRoutablePrintWriter, does not allow use of << operator (leftShift() method)

The following code throws an java.lang.UnsupportedOperationException at org.codehaus.groovy.grails.web.sitemesh.GrailsRoutablePrintWriter$NullWriter.write(GrailsRoutablePrintWriter.java:243)

response.writer << "text"

The workaround is to use the write method or the targetResponse instead:

response.writer.write("text")
//or
response.targetResponse.writer << "text"