java - Character encoding in JSON en MySQL -

i have problem regarding encoding.

i created mysql 5.5 db containing text. create java webservice creates json read android application.

i have stored text in db , looks good, example :

verwarm de oven voor op 210°c

but when check json in browser looks (and in android app)

{"gerechtid":"6","id":"13","laatsteupdate":"2013-02-14t15:53:42+01:00","text":"verwarm de oven voor op 210°c","titel":"oven voorverwarmen","volgnr":"1"}

as can see, temperature showing characters don't ;-)

how can avoid ?

i'm using hibernate 3 reading db. here persistence.xml :

<?xml version="1.0" encoding="utf-8"?> <persistence version="2.0"     xmlns="http://java.sun.com/xml/ns/persistence"     xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"     xsi:schemalocation="http://java.sun.com/xml/ns/persistence     http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd ">     <persistence-unit name="lengo" transaction-type="resource_local">     <provider>org.hibernate.ejb.hibernatepersistence</provider>      <properties>          <property name="hibernate.archive.autodetection" value="class, hbm"/>         <property name="hibernate.connection.url" value="jdbc:mysql://62.213.197.17/lengotoo_autikoken?autoreconnect=true&amp;useunicode=true&amp;characterencoding=utf-8"/>         <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.driver"/>         <property name="hibernate.dialect" value="org.hibernate.dialect.mysqldialect"/>      </properties> </persistence-unit> </persistence> 

i solved question doing :

@produces(mediatype.application_json + "; charset=utf-8") 

instead of

@produces(mediatype.application_json) 

in resources of webservice.