Pentaho Job failed. After first commit the db connection close.

This is something new to me.

when I am trying to execute the job on server. During the loading Process in Oracle db Table. After first commit the to table the connection are getting closed automatically.

I am attaching the log details. please help !!!

As per as the commit size the record are getting loaded. but only one single commit.
if the commit size is 1000 then first 1000 records are loaded.
if the commit size is 2000 then first 2000 records are loaded.
then the connection db closed.

Log:
2015/06/15 16:25:38 - Load UKIA_2.0 -
2015/06/15 16:25:38 - Load UKIA_2.0 - Unexpected error inserting row
2015/06/15 16:25:38 - Load UKIA_2.0 - -32233
2015/06/15 16:25:38 - Load UKIA_2.0 -
2015/06/15 16:25:38 - Load UKIA_2.0 -
2015/06/15 16:25:38 - Load UKIA_2.0 - at org.pentaho.di.trans.steps.tableoutput.TableOutput.writeToTable(TableOutput.java:445)
2015/06/15 16:25:38 - Load UKIA_2.0 - at org.pentaho.di.trans.steps.tableoutput.TableOutput.processRow(TableOutput.java:128)
2015/06/15 16:25:38 - Load UKIA_2.0 - at org.pentaho.di.trans.step.RunThread.run(RunThread.java:60)
2015/06/15 16:25:38 - Load UKIA_2.0 - at java.lang.Thread.run(Thread.java:744)
2015/06/15 16:25:38 - Load UKIA_2.0 - Caused by: org.pentaho.di.core.exception.KettleDatabaseException:
2015/06/15 16:25:38 - Load UKIA_2.0 - Unexpected error inserting row
2015/06/15 16:25:38 - Load UKIA_2.0 - -32233
2015/06/15 16:25:38 - Load UKIA_2.0 -
2015/06/15 16:25:38 - Load UKIA_2.0 - at org.pentaho.di.trans.steps.tableoutput.TableOutput.writeToTable(TableOutput.java:341)
2015/06/15 16:25:38 - Load UKIA_2.0 - ... 3 more
2015/06/15 16:25:38 - Load UKIA_2.0 - Caused by: java.lang.ArrayIndexOutOfBoundsException: -32233
2015/06/15 16:25:38 - Load UKIA_2.0 - at oracle.jdbc.driver.OraclePreparedStatement.setupBindBuffers(OraclePreparedStatement.java:2677)
2015/06/15 16:25:38 - Load UKIA_2.0 - at oracle.jdbc.driver.OraclePreparedStatement.executeBatch(OraclePreparedStatement.java:9255)
2015/06/15 16:25:38 - Load UKIA_2.0 - at oracle.jdbc.driver.OracleStatementWrapper.executeBatch(OracleStatementWrapper.java:210)
2015/06/15 16:25:38 - Load UKIA_2.0 - at org.pentaho.di.trans.steps.tableoutput.TableOutput.writeToTable(TableOutput.java:315)
2015/06/15 16:25:38 - Load UKIA_2.0 - ... 3 more
2015/06/15 16:25:38 - Load UKIA_2.0 - Signaling 'output done' to 0 output rowsets.
2015/06/15 16:25:38 - UK_3 - Commit on database connection [UK_3]
2015/06/15 16:25:38 - Load UKIA_2.0 - Stopped while putting a row on the buffer
2015/06/15 16:25:38 - Load UKIA_2.0 - Stopped while putting a row on the buffer
2015/06/15 16:25:38 - Load UKIA_2.0 - Stopped while putting a row on the buffer
2015/06/15 16:25:39 - Load UKIA_2.0 - Stopped while putting a row on the buffer
2015/06/15 16:25:39 - Load UKIA_2.0 - Stopped while putting a row on the buffer
2015/06/15 16:25:39 - Load UKIA_2.0 - Stopped while putting a row on the buffer
2015/06/15 16:25:39 - Load UKIA_2.0 - Stopped while putting a row on the buffer
2015/06/15 16:25:39 - Load UKIA_2.0 - Stopped while putting a row on the buffer
2015/06/15 16:25:39 - Load UKIA_2.0 - Signaling 'output done' to 0 output rowsets.
2015/06/15 16:25:39 - UK_3 - Rollback on database connection [UK_3]
2015/06/15 16:25:39 - UK_3 - Commit on database connection [UK_3]
2015/06/15 16:25:39 - UK_3 - Connection to database closed!
2015/06/15 16:25:39 - Load UKIA_2.0 - Finished processing (I=0, O=1999, R=2000, W=1000, U=0, E=1)