?
Solved

FATAL: sorry, too many clients already

Posted on 2010-08-16
4
Medium Priority
?
1,689 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
[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
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 280 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 720 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

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

Java contains several comparison operators (e.g., <, <=, >, >=, ==, !=) that allow you to compare primitive values. However, these operators cannot be used to compare the contents of objects. Interface Comparable is used to allow objects of a cl…
Go is an acronym of golang, is a programming language developed Google in 2007. Go is a new language that is mostly in the C family, with significant input from Pascal/Modula/Oberon family. Hence Go arisen as low-level language with fast compilation…
Viewers will learn about arithmetic and Boolean expressions in Java and the logical operators used to create Boolean expressions. We will cover the symbols used for arithmetic expressions and define each logical operator and how to use them in Boole…
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
Course of the Month9 days, 19 hours left to enroll

762 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