replace place holder in header and footer

Hi all,
I am using apache poi latest .
we had a template file abc.docx.
it has some header image ,and need some data to dispaly in header.
example
Job Id :#jobid
Student name:#sname

we need to replace the string after # in header of doc.

i had followed the sample.
apache poi - How to replace placeholders in header of docx in java using poi 3.8 - Stack Overflow

but text is not matching.its comes like
Job
Id
:
#
jobid

why this happens .

please help me