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From "baba shinde (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-4332) Issue in Derby Database while fetching CLOB datatype or while commiting the transaction.
Date Mon, 03 Aug 2009 05:23:14 GMT
Issue in Derby Database while fetching CLOB datatype or while commiting the transaction.
----------------------------------------------------------------------------------------

                 Key: DERBY-4332
                 URL: https://issues.apache.org/jira/browse/DERBY-4332
             Project: Derby
          Issue Type: Bug
          Components: JDBC
    Affects Versions: 10.5.1.1
         Environment: Windows XP SP2, machine: core 2 duo processor, 2GM primary mem.
            Reporter: baba shinde
            Priority: Critical


I am using Derby database for my application where auto commit on connection is set to false
and I am doing the manual commit after every database update calls. In my application I am
using CLOB data type to store the large string data in table column. And there are couples
of test cases written to ensure the database working, but it has found very weird/inconsistent
behavior of database either while fetching the data or while deleting the fetched data from
database table. Probability of passing the test cases is 50 %( half of the time test cases
fails and half of the time all test cases cleanly passes through)
Inconsistent behavior in the sense: every time code fails for either of the exception given
below:

1) This exception occurs while removing the record from database.
Exception in thread "TestHandler-2-thread-1" java.lang.ArrayIndexOutOfBoundsException: -1
at org.apache.derby.client.net.Request.popMark(Unknown Source)
at org.apache.derby.client.net.Request.updateLengthBytes(Unknown Source)
at org.apache.derby.client.net.NetStatementRequest.buildEXCSQLSTT(Unknown Source)
at org.apache.derby.client.net.NetStatementRequest.writeExecute(Unknown Source)
at org.apache.derby.client.net.NetPreparedStatement.writeExecute_(Unknown Source)
at org.apache.derby.client.am.PreparedStatement.writeExecute(Unknown Source)
at org.apache.derby.client.am.PreparedStatement.flowExecute(Unknown Source)
at org.apache.derby.client.am.PreparedStatement.executeX(Unknown Source)
at org.apache.derby.client.am.PreparedStatement.execute(Unknown Source)

code snippet for the same is:
try {
      removeMessageStmt.setString(1, messageId);
      removeMessageStmt.execute();
      connection.commit();
    } catch (SQLException e) {
      try {
        connection.rollback();
      } catch (SQLException tx) {
        log.error("Failed to rollback the transaction", tx);
      }
  }
where removeMessageStmt is the prepared statement initialize at start.

2) java.sql.SQLNonTransientConnectionException: No current connection. Exception in connection.rollback()
at org.apache.derby.client.am.SQLExceptionFactory40.getSQLException(Unknown Source) [derbyclient.jar:na]
at org.apache.derby.client.am.SqlException.getSQLException(Unknown Source) [derbyclient.jar:na]
at org.apache.derby.client.am.Connection.rollback(Unknown Source) [derbyclient.jar:na]
at org.apache.commons.dbcp.DelegatingConnection.rollback(DelegatingConnection.java:328) [commons-dbcp-1.2.2.jar:1.2.2]

Caused by: org.apache.derby.client.am.SqlException: No current connection.
at org.apache.derby.client.am.Connection.checkForClosedConnection(Unknown Source) [derbyclient.jar:na]
... 20 common frames omitted

Caused by: java.sql.SQLNonTransientConnectionException: A network protocol error was encountered
and the connection has been terminated: A PROTOCOL Data Stream Syntax Error was detected.
 Reason: 0x2,644. Plaintext connection attempt to an SSL enabled server?
at org.apache.derby.client.am.SQLExceptionFactory40.getSQLException(Unknown Source) [derbyclient.jar:na]
at org.apache.derby.client.am.SqlException.getSQLException(Unknown Source) [derbyclient.jar:na]
at org.apache.derby.client.am.PreparedStatement.execute(Unknown Source) [derbyclient.jar:na]
at org.apache.commons.dbcp.DelegatingPreparedStatement.execute(DelegatingPreparedStatement.java:169)
[commons-dbcp-1.2.2.jar:1.2.2]

I ran the test cases on SSL enabled connection but eror still exists. 

3) some times it gives throws an exception while while fetching the CLOB data from database
tables.   
The exception 'java.sql.SQLException: The locator that was supplied for this CLOB/BLOB is
invalid' was thrown while evaluating an expression.
You cannot invoke other java.sql.Clob/java.sql.Blob methods after calling the free() method
or after the Blob/Clob's transaction has been committed or rolled back. 
this occurs even if I am using connection with auto commit false and committing on connection
before result set is closed. code snippet for the same is:

    String str = "";
    getMessageStmt.setString(1, messageId);
     ResultSet resultSet = getMessageStmt.executeQuery();
     Clob clob = null;
     if (resultSet.next()) {
        clob = resultSet.getClob(1);
        try {
          str  = clobStringConversion(clob);
        } catch (IOException e) {
          throw new SQLException("Failed to convert CLOB to String.", e);
        }
      } else {
        log.info("No record found for the messageId: " + messageId);
        return null;
      }
      connection.commit();
      resultSet.close();
    
where *getMessageStmt is the preparedStatement initialized at start of application

I appreciate any help or pointers you can provide!

Thanks and Regards,
Baba



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