[How to keep line separator with CLOB]

Hello, I got a problem trying to print comments in my report.

Comment are stored in my ORACLE base in a table text_comment in a column where type is a varchar2.
Those comments are stored using more than one line.
exemple of data :
INDICE       |        TEXTE
     1             |        TOTO/n
     2             |        TUTU

So, when I concat my comments i can get something too big for a varchar (more than 4000 char)

In my report Comments are not my details, for each details I have many comments so I concat them.

I manage to concat my comments in one bloc using CLOB. Using this method : 

SELECT
[...]
DBMS_XMLGEN.CONVERT(
EXTRACT(xmltype('<?xml version="1.0"?><document>'||XMLAGG(XMLTYPE('<V>'|| DBMS_XMLGEN.CONVERT(COMMENTAIRE_TEXTE_FOOTER.COTE_TEXTE)|| ' </V>')  
ORDER BY COMMENTAIRE_TEXTE_FOOTER.COTE_INDICE).getclobval()||'</document>'), '/document/V/text()') .getclobval(),1) AS COMMENTAIRE_FOOTER
[...]
FROM [...] COMMENTAIRE_TEXTE_FOOTER [...]

With this I get a oracle.jdbc.internal.OracleClob object for Ireport.

Using iReport Designer 5.6.0 I read the CLOB Object like this : 
new BufferedReader(new InputStreamReader(((oracle.jdbc.internal.OracleClob)$F{COMMENTAIRE_FOOTER}).binaryStreamValue())).readLine();

My problem is that when i get my concatened comment, it came as a one line comment. 

Exemple : TOTO/nTUTU
But I want :
TOTO
TUTU

Is there a way to keep my line separators throught all the data conversion ?

Jérôme