sqlserver2000中使用JDBC，addBatch方法，报内存溢出？？？

望高手指导!
异常：
Exception in thread "Thread-5" java.lang.OutOfMemoryError: Java heap space
at com.microsoft.jdbc.base.BaseParameters.<init>(Unknown Source)
at com.microsoft.jdbc.base.BasePreparedStatement.addBatch(Unknown Source)
伪代码：list为数据集，list数据达到一定数据量后执行以下for循环插入数据，插入完成后清空list。再填充list，执行以下循环....往复循环此操作，当循环10次是没有问题的，大于10次后就报如上错误。


for ( list//数据集)
{

StringBuilder commandBuilder = new StringBuilder(
"INSERT INTO [" + flowType + "] VALUES(?" );
for ( ... )
{
commandBuilder.append( ", ?" );
}
commandBuilder.append( ")" );
pstmt = conn.getConnection().prepareStatement( command );
// 缓冲区中的数据量
int rowCount = 0;
for ( ... )
{

pstmt.setString( j , *** );
pstmt.addBatch();

if ( rowCount == 1000 )
{
conn.getConnection().setAutoCommit( false );
pstmt.executeBatch();
conn.getConnection().setAutoCommit( true );
pstmt.clearBatch();
rowCount = 0;
}
}
if ( rowCount != 0 )
{
conn.getConnection().setAutoCommit( false );
pstmt.executeBatch();
conn.getConnection().setAutoCommit( true );
}
list.clear();//数据集清空
} catch ( Exception e )
{
log.error( "", e );
} finally
{

try
{
if ( pstmt != null )
{
pstmt.close();
}

if ( conn != null )
{
conn.close();
}

} catch ( SQLException e )
{
log.error( "", e );
}

}
}