Solved

FATAL: sorry, too many clients already

Posted on 2010-08-16
4
1,515 Views
Last Modified: 2013-12-22
I am using a reusable EntityManager design, similar to
http://blog.julianpaas.com/?p=65

according to this approach, the EntityManager is kept alive (does not call em.close), so it is reused within a thread.

after running my program for a while, I start to get

org.postgresql.util.PSQLException: FATAL: sorry, too many clients already

I am wondering if this is due to the fact I don't call em.close, and some how, too many threads ended up using too many connections.

It is a big change if I add in em.close every where. I wonder if someone can give me a tip whether this is the area of suspect, or there is some other way I can resolve this out of connection error.

I am using c3p0 connection pooling with max_size set at 20.
0
Comment
Question by:bhomass
  • 2
4 Comments
 
LVL 10

Expert Comment

by:Hegemon
ID: 33454085
in J2EE environment Entity Manager will automatically close at the end of your EJB method.
If you open it manually / not use it in EJB methods, you have to close it manually as well.
0
 
LVL 10

Assisted Solution

by:gordon_vt02
gordon_vt02 earned 70 total points
ID: 33454496
Check your database configuration and make sure the maximum connections are set high enough to support your application.  Are there any other apps using the database at the same time?  If so, make sure the connection limit can support all of them.
0
 

Author Comment

by:bhomass
ID: 33456128
can I ask if I call em.close(), does that guarantee to close the db connection?
0
 
LVL 10

Accepted Solution

by:
Hegemon earned 180 total points
ID: 33456144
In a managed J2EE environment (EJB) this will produce an exception.
In a non-managed environment, which I suspect is what you have, yes, it will release the connection and return it to the pool.
0

Featured Post

Master Your Team's Linux and Cloud Stack!

The average business loses $13.5M per year to ineffective training (per 1,000 employees). Keep ahead of the competition and combine in-person quality with online cost and flexibility by training with Linux Academy.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
jsp login check 12 43
Chrome and Firefox Java 5 51
Is there a simpler dropbox system? 10 34
Need Help! Getting a syntax error and don't understand why 3 31
For beginner Java programmers or at least those new to the Eclipse IDE, the following tutorial will show some (four) ways in which you can import your Java projects to your Eclipse workbench. Introduction While learning Java can be done with…
This was posted to the Netbeans forum a Feb, 2010 and I also sent it to Verisign. Who didn't help much in my struggles to get my application signed. ------------------------- Start The idea here is to target your cell phones with the correct…
Viewers will learn one way to get user input in Java. Introduce the Scanner object: Declare the variable that stores the user input: An example prompting the user for input: Methods you need to invoke in order to properly get  user input:
Viewers will learn about basic arrays, how to declare them, and how to use them. Introduction and definition: Declare an array and cover the syntax of declaring them: Initialize every index in the created array: Example/Features of a basic arr…

828 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