Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

multi-threading and JDBC Oracle 8i thin driver

Posted on 2002-03-06
5
Medium Priority
?
448 Views
Last Modified: 2008-03-03
I would appreciate if anyone could explain this problem for me:

In my program I am creating a thread to insert records in dB, several threds are running at the same time to do tnhe same functionality . I don't know if this helps I am using JDBC Oracle 8i thin driver and multi-threading and keep getting this problem:


Protocol violation
java.sql.SQLException: Io exception: not in streaming mode
        at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:168)
        at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:210)
        at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:323)
        at oracle.jdbc.driver.OracleStatement.freeLine(OracleStatement.java:4621)
        at oracle.jdbc.driver.OracleConnection.needLine(OracleConnection.java:1627)
        at oracle.jdbc.driver.OracleStatement.<init>(OracleStatement.java:412)
        at oracle.jdbc.driver.OracleConnection.privateCreateStatement(OracleConnection.java:474)
        at oracle.jdbc.driver.OracleConnection.createStatement(OracleConnection.java:383)

0
Comment
Question by:shakfan
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
5 Comments
 
LVL 5

Accepted Solution

by:
kelfink earned 320 total points
ID: 6844856
If you are using one connectin for multiple threads, this is the problem.  Each concurrent thread needs its own connection.

TO reduce the cost of connecting for each thread, use a Connection Pool.  
0
 
LVL 9

Expert Comment

by:Venci75
ID: 6846603
in addition to kelfink's comment, you can enclose the usage of the connection in your code:
synchronyzed (conn) {
// using the connection
}

Make sure that every peace of code, that uses shared connection is synchronyzed
0
 
LVL 5

Expert Comment

by:kelfink
ID: 6848702
While synchronizing might avoid the problem, it makes the multithreading capacity pretty worthless, unless the database activity is an insignificant portion of the time spend in the thread.
0
 
LVL 35

Expert Comment

by:girionis
ID: 8681445
No comment has been added lately, so it's time to clean up this TA.

I will leave a recommendation in the Cleanup topic area that this question is:

- points to kelfink

Please leave any comments here within the
next seven days.

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER !

girionis
Cleanup Volunteer
0

Featured Post

Tech or Treat! - Giveaway

Submit an article about your scariest tech experience—and the solution—and you’ll be automatically entered to win one of 4 fantastic tech gadgets.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

INTRODUCTION Working with files is a moderately common task in Java.  For most projects hard coding the file names, using parameters in configuration files, or using command-line arguments is sufficient.   However, when your application has vi…
In this post we will learn different types of Android Layout and some basics of an Android App.
Viewers learn about the “for” loop and how it works in Java. By comparing it to the while loop learned before, viewers can make the transition easily. You will learn about the formatting of the for loop as we write a program that prints even numbers…
This tutorial explains how to use the VisualVM tool for the Java platform application. This video goes into detail on the Threads, Sampler, and Profiler tabs.
Suggested Courses

618 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question