java.sql.SQLRecoverableException: No more data to read from socket

Question

I have a database table in oracle which has a column of type DATE. It looks like the table below

TABLE1

ID   PRODUCT_NAME  ITEM_CNT  ENTERED_DATE 
1         prod1      500       2012-07-01
2         prod2      1000      2012-06-30 

in my java code, I want to get the total item_cnt for a certain date range. here is the code sample

String sql = "select sum(item_cnt) from table1 where entered_date between ? and ?";
Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rset = null;

try{
   conn = getConnection(url, user, passwd);
   pstmt = conn.prepareStatement(sql);
   pstmt.setDate(1, java.sql.Date.valueOf(from_date)); //from_date is a string of "yyyy-mm-dd"
   pstmt.setDate(2, java.sql.Date.valueOf(to_date)); //to_date is a string of "yyyy-mm-dd"
   rset = pstmt.executeQuery();

   ....
}catch(SQLException e){
   //do something
} finally{
   //clean up
}

This code was running fine for a while until three days ago, I start getting the following exception at line pstmt.executeQuery();

    java.sql.SQLRecoverableException: No more data to read from socket
at oracle.jdbc.driver.T4CMAREngine.unmarshalUB1(T4CMAREngine.java:1157)
at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:290)
at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:192)
at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:531)
at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:207)
at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:884)
at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1167)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1289)
at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3584)
at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:3628)
at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeQuery(OraclePreparedStatementWrapper.java:1493)

I tried to search for answers but couldn't find anything that really explains it. then I changed my sql query to

    "select sum(item_cnt) from table1 where entered_date between to_date(?, 'yyyy-mm-dd')  and to_date(?, 'yyyy-mm-dd')";

and instead of setting date, I changed the prepared statement to the following

     pstmt.setString(1, from_date);
     pstmt.setString(2, to_date);

Then the exception is gone.

Another confusion is, when I populate my table, I am still using the following

   pstmt.setDate(1, java.sql.Date.valueOf(date)); //date is a string of format "yyyy-mm-dd"

and it is still working. only the select statement was giving me exceptions.

Now everything is working but I really want to know why. Anyone knows?

I did upgrade my java to 1.7.0_03-b05 recently. and I am using ojdbc6.jar. The oracle is 11g. Could this be the driver's problem? is ojdbc7 out?

Answer 1

I was facing this exception while working over JDBC with IBM WAS 7.0, I had performed a JCA lifecycle management operation on data source. Which is like controlling the runtime status of the data source. Purge removes the contents of connection pool for the data source. However, in WAS this purging the pool will not affect the ongoing transactions. Check on your side.

Another thing which I performed was; the disk space was full on directory where Oracle was installed, I added extra space over that.

Answer 2

最佳实践是，在使用Oracle处理Java中的Dates时，我远离java.sql.Date类，并使用to_date（）和to_char（）函数。