java - Insert values from arraylist into database -

i use addbatch() , executebatch() insert values arraylist database.

but when run code error message appeared:

exception in thread "main" java.sql.batchupdateexception: duplicate entry '5' key 'primary'   @ com.mysql.jdbc.preparedstatement.executebatchserially(preparedstatement.java:2020)   @ com.mysql.jdbc.preparedstatement.executebatch(preparedstatement.java:1451) 

this data:
1 r1
7 r1
2 b r1
3 c r1
4 b r1
8 r1
5 r1
9 c r1
6 c r1

this part of code:

    public void insertdb(arraylist<eventlog> d) throws sqlexception {           string insert = "insert eventlog values(?,?,?)";           preparedstatement ps = conn.preparestatement(insert);           (int k = 0; k < d.size()-1; k++) {               ps.setint(1, d.get(k).getevent_id()); // event id               ps.setstring(3,d.get(k).getresources()); // resource               ps.setstring(2,d.get(k).getactivity()); // activity               ps.addbatch();           }           ps.executebatch();       }   

the code looks fine, make sure table truncated before run since looks more or less static set of fields.

to clarify further, primary key 5 exists in database , need delete before running code.