Java equivalent data type for chkpass.

Hello,

I am updating chkpass data type column using JDBC preparedstatement, but it give me following exception.

org.postgresql.util.PSQLException: ERROR: column "password" is of type chkpass but expression is of type character varying
  Hint: You will need to rewrite or cast the expression.
  Position: 73
    at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2062)
    at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1795)
    at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:257)
    at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:479)
    at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:367)
    at org.postgresql.jdbc2.AbstractJdbc2Statement.executeUpdate(AbstractJdbc2Statement.java:321)
    at com.servient.processor.utilities.ToolUtils.main(ToolUtils.java:58)

Is anybody aware of the data type we should set for this password column?

Thanks
--Saurabh