mysql - Invalid text content for insertion to database in Java? -

i trying store comments facebook post. there 25 comments , can them in json array , print console loop in java. when try store them mysql database, occurs 14th element of array. program ends without error or exception. stores 13 elements database , prints them console. if not connected database prints 25 elements console. control if clause, changing comment content this:

string content;    (int j = 0; j < array.size(); j++){             if (j==13)             {               content = "changed content";             }           else             {               content = ((jsonobject)array.get(j)).get("message").tostring();             }

and store elements db. of course 14th elements content stored "changed content."

i store them code:

string addcomments = "insert comments values("+commentid+",'"+commentfrom+"','"  +content+"',"+likecount+",'"+createddate+"',"+postid+")";                         stmt.executeupdate(addcomments);

i have no idea why problem occurs. i'm waiting help.