Comments on: Automatic reconnect from Hibernate to MySQL http://www.databasesandlife.com/automatic-reconnect-from-hibernate-to-mysql/ Adrian Smith's blog Mon, 06 Feb 2012 05:20:25 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: AlberTaker http://www.databasesandlife.com/automatic-reconnect-from-hibernate-to-mysql/comment-page-1/#comment-70976 AlberTaker Thu, 15 Sep 2011 22:02:01 +0000 http://www.databasesandlife.com/?p=315#comment-70976 Hi. I was looking for a solution to this problem. I tried all the things you say with no lucky. But I found the fix I need. I have to configure and specified this property in my hibernate.cfg.xml (up to date version of Hibernate 3.x): <code><property name="hibernate.connection.release_mode">after_transaction</property></code> With this property set up several solutions works for me (the "testConnectionsOnCheckout" for example). I use the "idle_test_period" with 180 seconds and the problem is solved ;) Thanks a lot! :) Hi.

I was looking for a solution to this problem. I tried all the things you say with no lucky. But I found the fix I need.

I have to configure and specified this property in my hibernate.cfg.xml (up to date version of Hibernate 3.x):
<property name="hibernate.connection.release_mode">after_transaction</property>

With this property set up several solutions works for me (the “testConnectionsOnCheckout” for example). I use the “idle_test_period” with 180 seconds and the problem is solved ;)

Thanks a lot! :)

]]> By: Roger Chen http://www.databasesandlife.com/automatic-reconnect-from-hibernate-to-mysql/comment-page-1/#comment-68967 Roger Chen Fri, 02 Sep 2011 01:28:48 +0000 http://www.databasesandlife.com/?p=315#comment-68967 Thanks! it works! Thanks! it works!

]]> By: Rodrigo http://www.databasesandlife.com/automatic-reconnect-from-hibernate-to-mysql/comment-page-1/#comment-68765 Rodrigo Wed, 31 Aug 2011 12:34:27 +0000 http://www.databasesandlife.com/?p=315#comment-68765 I was looking for the solution to this problem, but never finding the correct reference to fix it. Your explanation points directly to solve it! And here it works fine!!!! Thanks a lot!!! I was looking for the solution to this problem, but never finding the correct reference to fix it. Your explanation points directly to solve it! And here it works fine!!!! Thanks a lot!!!

]]> By: Dejan Vukmirović http://www.databasesandlife.com/automatic-reconnect-from-hibernate-to-mysql/comment-page-1/#comment-52353 Dejan Vukmirović Fri, 27 May 2011 08:26:05 +0000 http://www.databasesandlife.com/?p=315#comment-52353 Thanks!! You just saved me :) Thanks!! You just saved me :)

]]> By: Jacomo http://www.databasesandlife.com/automatic-reconnect-from-hibernate-to-mysql/comment-page-1/#comment-50607 Jacomo Mon, 16 May 2011 22:57:06 +0000 http://www.databasesandlife.com/?p=315#comment-50607 Great post, love the humor as well. Definitely pointed me in the right direction. BTW, for those of you who've set hibernate.c3p0.validate=true, be aware that this is a Hibernate 2.x setting only. It does not work in Hibernate 3.x. In 3.x you have to create the separate c3p0.properties and set c3p0.testConnectionsOnCheckout=true in there. See this page for Hibernate-specific settings in c3p0: <http://www.mchange.com/projects/c3p0/index.html#hibernate-specific< Great post, love the humor as well. Definitely pointed me in the right direction.

BTW, for those of you who’ve set hibernate.c3p0.validate=true, be aware that this is a Hibernate 2.x setting only. It does not work in Hibernate 3.x.

In 3.x you have to create the separate c3p0.properties and set c3p0.testConnectionsOnCheckout=true in there.

See this page for Hibernate-specific settings in c3p0: <http://www.mchange.com/projects/c3p0/index.html#hibernate-specific&lt;

]]> By: Rao http://www.databasesandlife.com/automatic-reconnect-from-hibernate-to-mysql/comment-page-1/#comment-46725 Rao Mon, 25 Apr 2011 03:36:19 +0000 http://www.databasesandlife.com/?p=315#comment-46725 Hi, I am getting following error in the JBOSS log. [com.mchange.v2.resourcepool.BasicResourcePool] (C3P0PooledConnectionPoolManager-Helper Thread-#1) com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask@15b2f35 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception: java.lang.NullPointerException. Thye persistence.xml is as follows org.hibernate.ejb.HibernatePersistence java:/testDS <!-- use a file system based index --> <!-- directory where the indexes will be stored --> <!-- Not needed with HA 3.3 --> <!-- C3P0 connection pooling to prevent connection drop outs --> <!-- this property forces the revalidation of a connection after the given amount of time (in secs) --> <!-- it must be set to LESS than the wait_timout setting for the mysql server (this setting defaults to 28800 secs (8 hours)) --> Please let me know what am I doing wrong. I am using hibernate-c3p0-3.3.2.GA for C3P0ConnectionProvider.class and c3p0-0.9.2.jar with JBOSS,Hibernate Hi,

I am getting following error in the JBOSS log.

[com.mchange.v2.resourcepool.BasicResourcePool] (C3P0PooledConnectionPoolManager-Helper Thread-#1) com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask@15b2f35 — Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception:
java.lang.NullPointerException.

Thye persistence.xml is as follows

org.hibernate.ejb.HibernatePersistence
java:/testDS


Please let me know what am I doing wrong.

I am using hibernate-c3p0-3.3.2.GA for C3P0ConnectionProvider.class and c3p0-0.9.2.jar with JBOSS,Hibernate

]]> By: Hibernate mySQL connection lost overnight « Stumbling into Java http://www.databasesandlife.com/automatic-reconnect-from-hibernate-to-mysql/comment-page-1/#comment-46353 Hibernate mySQL connection lost overnight « Stumbling into Java Sat, 23 Apr 2011 05:02:42 +0000 http://www.databasesandlife.com/?p=315#comment-46353 [...] Automatic reconnect from Hibernate to MySQL [...] [...] Automatic reconnect from Hibernate to MySQL [...]

]]> By: mozcelik http://www.databasesandlife.com/automatic-reconnect-from-hibernate-to-mysql/comment-page-1/#comment-46034 mozcelik Thu, 21 Apr 2011 11:31:08 +0000 http://www.databasesandlife.com/?p=315#comment-46034 Thanks for the past, it solved my problem too. For the configurations I used only persistence.xml to configure c3p0. (no need to c3p0.properties file) in persistence.xml I added properties hibernate.connection.provider_class = org.hibernate.connection.C3P0ConnectionProvider hibernate.c3p0.idle_test_period = 5000 hibernate.c3p0.preferredTestQuery = SELECT 1; That's it. Thanks for the past, it solved my problem too. For the configurations I used only persistence.xml to configure c3p0. (no need to c3p0.properties file)

in persistence.xml I added properties

hibernate.connection.provider_class = org.hibernate.connection.C3P0ConnectionProvider
hibernate.c3p0.idle_test_period = 5000
hibernate.c3p0.preferredTestQuery = SELECT 1;

That’s it.

]]> By: Jorge Cordero http://www.databasesandlife.com/automatic-reconnect-from-hibernate-to-mysql/comment-page-1/#comment-37729 Jorge Cordero Tue, 01 Mar 2011 21:52:31 +0000 http://www.databasesandlife.com/?p=315#comment-37729 Awesome post, helped me a lot! Cheers! Awesome post, helped me a lot! Cheers!

]]> By: Silveirinha http://www.databasesandlife.com/automatic-reconnect-from-hibernate-to-mysql/comment-page-1/#comment-28340 Silveirinha Tue, 28 Dec 2010 15:14:32 +0000 http://www.databasesandlife.com/?p=315#comment-28340 you save my life!!! you save my life!!!

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