connection-pooling

PROBLEM I have recently been put in charge of a Java web application with code already written and in place. The app receives moderately high traffic and has peak hours of traffic between 11am to 3pm everyday. The application uses Spring, JPA(Hibernate), MYSQL DB. Spring has been configured to use tomcat jdbc connection pool to make connections to the DB. (Details of configuration at the end of the post) For the past few days, during the application's peak load hours, the application has been going down due to tomcat going unresponsive to requests. It has required tomcat to be restarted

Here is how I use it - private static final PoolingHttpClientConnectionManager connPool; static { connPool = new PoolingHttpClientConnectionManager(); // Increase max total connection to 200 connPool.setMaxTotal(200);//configurable through app.properties // Increase default max connection per route to 50 connPool.setDefaultMaxPerRoute(20);//configurable through app.properties } CloseableHttpClient httpClient = HttpClients.custom() .setConnectionManager(connPool) .build(); ALso I have put a finally block around http GET - finally { try { httpClient.close(); } catch (IOException e) { LOGGER

I'm using a JNDI for creating tomcat connection pool. It works great in a web application. I believe the InitialContext is provided by the tomcat server. Context initContext = new InitialContext(); Context envContext = (Context)initContext.lookup("java:/comp/env"); dataSource = (DataSource)envContext.lookup("jdbc/testdb"); But when I try to call the same utility from a standalone Java program, the initContext object is null. How can I explicitly provide all the necessary properties that Context object is expecting. Error : javax.naming.NoInitialContextException: Need to specify class name in

I'm looking for a way in Python (2.7) to do HTTP requests with 3 requirements: timeout (for reliability) content maximum size (for security) connection pooling (for performance) I've checked quite every python HTTP librairies, but none of them meet my requirements. For instance: urllib2: good, but no pooling import urllib2 import json r = urllib2.urlopen('https://github.com/timeline.json', timeout=5) content = r.read(100+1) if len(content) > 100: print 'too large' r.close() else: print json.loads(content) r = urllib2.urlopen('https://github.com/timeline.json', timeout=5) content = r.read

I have implemented a very simple ConnectionPool in Java. It has no fancy features, just get/release connection methods. How can I test it is working? I know there are plenty of connection Pools ready to use out there, which are much more reliable than what I'll do, but I am just trying to practice to understand how connections Pool work. Thank you! Here is the code in case it helps: public class ConnectionPoolImpl implements ConnectionPool { private Vector<PooledConnection> connections; // The connections container String url; String username; String password; /** * Instanciates a new

I'm using C3P0 as a connection pool in Tomcat, and I'm seeing very worrying errors: 2010-09-16 13:25:00,160 [Timer-0] WARN com.mchange.v2.async.ThreadPoolAsynchronousRunner - com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@43502400 -- APPARENT DEADLOCK!!! Creating emergency threads for unassigned pending tasks! 2010-09-16 13:25:01,407 [Timer-0] WARN com.mchange.v2.async.ThreadPoolAsynchronousRunner - com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@43502400 -- APPARENT DEADLOCK!!! Complete Status: Managed Threads: 10 Active Threads: 0 Active Tasks: Pending