Java. SQL. sqlexception: the stream has been disabled.

The database fields are as follows:
Id integer
Username varchar2 (50) y
Sender varchar2 (50) y
Message long y
Sendtime varchar2 (20) y
Isread varchar2 (1) y

Getall method of Dao Layer
Public list <smspo> getall ()
{
String listsql = "select * from SMS ";
List <smspo> listsms = new arraylist <smspo> ();
Preparedstatement PS = dbbase. Prepare (connection, listsql );
Try {
Resultset rsw.ps.exe cutequery ();
While (Rs. Next ())
{
Smspo = new smspo ();
Smspo. setid (Rs. getint (1 ));
Smspo. setusername (Rs. getstring ("username "));
Smspo. setsender (Rs. getstring ("sender "));
Smspo. setsendtime (Rs. getstring ("sendtime "));
Smspo. setmessage (Rs. getstring ("message "));
Smspo. setisread (Rs. getboolean ("isread "));
Listsms. Add (smspo );
}
} Catch (sqlexception e ){
// Todo auto-generated Catch Block
E. printstacktrace ();
} Finally
{
Dbbase. Close (PS );
Dbbase. Close (connection );
}
Return listsms;
}

Test the main function:
Public static void main (string [] ARGs ){
Smsservice = new smsservice ();
List <smspo> List = smsservice. getall ();
Iterator <smspo> iterator = List. iterator ();
While (iterator. hasnext ())
{
Smspo = iterator. Next ();
System. Out. println (smspo. GetUserName ());
}
}
When running, an error occurs:
Java. SQL. sqlexception: the stream has been disabled.
At oracle. JDBC. Driver. databaseerror. throwsqlexception (databaseerror. Java: 111)
At oracle. JDBC. Driver. databaseerror. throwsqlexception (databaseerror. Java: 145)
At oracle. JDBC. Driver. databaseerror. throwsqlexception (databaseerror. Java: 207)
At oracle. JDBC. Driver. longaccessor. getbytes (longaccessor. Java: 150)
At oracle. JDBC. Driver. longaccessor. getstring (longaccessor. Java: 192)
At oracle. JDBC. Driver. t4clongaccessor. getstring (t4clongaccessor. Java: 421)
At oracle. JDBC. Driver. oracleresultsetimpl. getstring (oracleresultsetimpl. Java: 396)
At oracle. JDBC. Driver. oracleresultset. getstring (oracleresultset. Java: 1514)
At com.yy180.doc man. Dao. smsdao. getall (smsdao. Java: 33)
At com.yy180.doc man. Service. smsservice. getall (smsservice. Java: 19)
At com. yy180.all. testall. Main (testall. Java: 12)

When I modify the sequence of the DaO Layer Code:
While (Rs. Next ())
{
Smspo = new smspo ();
Smspo. setid (Rs. getint (1 ));
Smspo. setusername (Rs. getstring ("username "));
Smspo. setsender (Rs. getstring ("sender "));
Smspo. setmessage (Rs. getstring ("message "));
Smspo. setsendtime (Rs. getstring ("sendtime "));
Smspo. setisread (Rs. getboolean ("isread "));
Listsms. Add (smspo );
}

Run it ..
The reason may be that the stream reading from the database is sequential. When the database is not read in order, an error occurs,