I write a hibernate.cfg.xml file almost the same from hibernate books like:
<property name="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</property>
<property name="hibernate.connection.password">**</property>
<property name="hibernate.connection.url">jdbc:mysql://127.0.0.1:3306/db</property>
<property name="hibernate.connection.username">**</property>
<property name="hibernate.hbm2ddl.auto">update</property>
<property name="hibernate.cache.use_second_level_cache">false</property>
<property name="hibernate.cache.use_query_cache">false</property>
<property name="c3p0.min_size">5</property>
<property name="c3p0.max_size">30</property>
<property name="c3p0.time_out">1800</property>
<property name="c3p0.max_statement">50</property>
<!--property name="show_sql">true</property-->
<property name="format_sql"> true</property>
But this seems actually c3p0 is not used. When I do test to establish 1000 sessions, it tries to establish 1000 connections.
Could anyone please give me some hint about this?
Thank you
Looking at your configuration file seems that you are missing one key property
<property name="connection.provider_class">
org.hibernate.connection.C3P0ConnectionProvider
</property>
Try setting this property and see if this turns things around for you or not.
Related
I am using aurora mysql db. I am using mariadb connector j with hibernate.
I am using "org.mariadb.jdbc.Driver".I want to set following properties of this driver using hibernate cfg file.
set read only on connetion so that it will fetch data from read replica.
pooling mechanism of mariadb driver(minPoolSize , maxPoolSize etc.)
hibernte.cfg.xml
<hibernate-configuration>
<session-factory>
<!-- SQL Dialect -->
<property name="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</property>
<!-- Database Connection Settings -->
<property name="hibernate.connection.driver_class">org.mariadb.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql:aurora://xxxxx:3306/dbname</property>
<property name="hibernate.connection.username">xxxxx</property>
<property name="hibernate.connection.password">xxxxx</property>
<property name="hibernate.connection.assureReadOnly">true</property>
<property name="hibernate.connection.autoReconnect">true</property>
<property name="hibernate.connection.autocommit">false</property>
<property name="hibernate.connection.maxPoolSize">5</property>
<property name="hibernate.connection.minPoolSize">2</property>
<property name="hibernate.connection.poolName">MyConnectionPool</property>
<property name="hibernate.connection.pool">true</property>
<property name="hibernate.connection.maxIdleTime">7000</property>
<property name="show_sql">true</property>
<!-- Specifying Session Context -->
<property name="hibernate.current_session_context_class">org.hibernate.context.internal.ThreadLocalSessionContext</property>
<!-- Mapping With Model Class Containing Annotations -->
<mapping class="com.xxx.aurora.beans.xxx" />
<mapping class="com.xxx.aurora.beans.User" />
</session-factory>
</hibernate-configuration>
I am able to connect with aurora mysql, but not able to set the connection on readonly. My requirement is that I want to create the connection with read-only replica for read queries using single cluster end point.
I am taking reference form mariadb-connector-j
I am also wondering that can I use the maria db connection pool with hibernate, if yes then how?
Change these Lines
<property name="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</property>
<property name="hibernate.connection.url">jdbc:mysql:aurora://xxxxx:3306/dbname</property>
to
<property name="dialect">org.hibernate.dialect.MariaDBDialect</property>
<property name="connection.url">jdbc:mariadb://xxxxxx:3306/dbname</property>
When I made direct changes in the database, it's not reflected in the webservices response on request, however it is working once I restart the server. How can I make changes work immediately?
My hibernate configuration file looks like this:
<hibernate-configuration>
<session-factory>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect
</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver
</property>
<property name="hibernate.connection.url">
jdbc:mysql://localhost:3306/demo</property>
<property name="hibernate.connection.username">xxxx</property>
<property name="hibernate.connection.password">xxxx</property>
<property name="hibernate.cache.use_second_level_cache">true</property>
</session-factory>
</hibernate-configuration>
This is because you have use_second_level_cache set to true.
Change the value of use_second_level_cache to false and would hit db every time without using 2nd level cache
I've been using HSQLDialect as dialect for my database (MySQL, most of tables as InnoDB) on some projects and I never had any problem with Hibernate.
I encountered MySQLSyntaxErrorException when using setMaxResults() in a project using Spring 3.1.0 and Hibernate 3.6.9, and I still wonder where does that come from..
My XML config servlet :
<bean id="myDataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="org.hsqldb.jdbcDriver" />
<property name="url" value="jdbc:mysql://localhost:3306/product" />
<property name="username" value="root" />
<property name="password" value="***************" />
</bean>
<bean id="mySessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="dataSource" ref="myDataSource" />
<property name="mappingResources">
<list>
<value>com/social/admin/beans/DevDebugLogs.hbm.xml</value>
<value>com/social/admin/beans/Users.hbm.xml</value>
...
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect"> org.hibernate.dialect.HSQLDialect</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.hbm2ddl.auto">create</prop>
</props>
</property>
</bean>
<bean name="/logs.html" class="com.social.admin.controllers.DebugManagerAdmin">
<property name="sessionFactory" ref="mySessionFactory" />
</bean>
I tried to switch from HSQLDialect to MySQL5InnoDBDialect and it destroyed a big part of my database, dropping entries, deleting tables .... !!!!!!! X)
Can somebody help me ?
To avoid deleting tables and data, make sure you switch Hibernate in your configuration to update:
<prop key="hibernate.hbm2ddl.auto">update</prop>
This will help you to get rid of the problems with disappearing data.
Switching to MySQL5InnoDBDialect shouldn't cause any major problems. I have been using it for a very long time in every project of mine. The only thing that might happen is the fact, that some queries might not run exactly the same under different dialects, but you will be able to examine it at runtime or during tests.
I'm using spring 3.0 (jdbcTemplate), Tomcat, MySQL and C3p0 to handle my database activities. I'm using both jdbctemplate and simplejdbctemplate which will take care of creating and closing connections, statements, resultsets etc. I'm using C3p0 for connection pooling however the connections are remaining open and eventually the app will run out of connections.
Here is the configuration of my data source:
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close" >
<property name="driverClass" value="${jdbc.driverClassName}"></property>
<property name="jdbcUrl" value="${jdbc.url}"></property>
<property name="user" value="${jdbc.username}"></property>
<property name="password" value="${jdbc.password}"></property>
<property name="initialPoolSize" value="5"></property>
<property name="maxPoolSize" value="100"/>
<property name="minPoolSize" value="5"/>
<property name="maxIdleTime" value="30"/>
<property name="maxIdleTimeExcessConnections" value="30"/>
<property name="maxConnectionAge" value="30"/>
<property name="checkoutTimeout" value="100"/>
<property name="maxStatements" value="50"></property>
<property name="automaticTestTable" value="C3P0_TEST_TABLE"></property>
<property name="testConnectionOnCheckin" value="true"></property>
<property name="idleConnectionTestPeriod" value="30"></property>
</bean>
I'm also using TransactionManagement provided by spring - here is the configuration of that:
<!-- enable the configuration of transactional behavior based on annotations -->
<tx:annotation-driven transaction-manager="txManager"/>
<bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
Here is the rest of the datasource configuration:
<bean id="simpleJdbcTemplate" class="org.springframework.jdbc.core.simple.SimpleJdbcTemplate">
<constructor-arg><ref bean="dataSource"/></constructor-arg>
</bean>
<bean id="userDAO" class="com.Test.dao.UserDAOImpl">
<property name="jdbcTemplate"><ref bean="jdbcTemplate"/></property>
</bean>
Finally here is a method where I update records into a database:
#Transactional(readOnly=false)
public void updateBenchMarkCumulative(List<BenchMarkCumulative> bmCumulativeList)
{
List<Object[]> parameters = new ArrayList<Object[]>();
for(BenchMarkCumulative bmCumulative : bmCumulativeList)
{
parameters.add(new Object[]{bmCumulative.getCumulativeAmt(), bmCumulative.getPkBenchMarkCumulative()});
}
this.simpleJdbcTemplate.batchUpdate(UPDATE_BENCHMARK_CUMULATIVE, parameters);
}
Is there something I'm doing wrong in my configuration or am I missing something that needs to be added to the configuration or coding?
Here is the exception being thrown:
INFO [http-8080-1] (AbstractPoolBackedDataSource.java510) - Initializing c3p0 pool... com.mchange.v2.c3p0.ComboPooledDataSource [ java.beans.IntrospectionException: java.lang.reflect.InvocationTargetException [numThreadsAwaitingCheckoutDefaultUser] ]
org.springframework.transaction.CannotCreateTransactionException: Could not open JDBC Connection for transaction; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Data source rejected establishment of connection, message from server: "Too many connections"
Thank you in advance.
Keith
I would agree with axtavt. I was in a similar situation, and there were couple places I was manually opening connections but not closing them (stored procedure calls for iSeries). Please verify if you have that kind of spots.
MySQL seems to have an 8 hour time out on its connections. I'm running multiple WARs in Tomcat utilizing Hibernate for ORM. After 8 hours (i.e. overnight), I get broken pipes when it picks up an idle connection.
I've already traced through the code and made doubly sure I commit or rollback all transactions.
Here is my hibernate.cfg.xml
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.bytecode.use_reflection_optimizer">false</property>
<property name="hibernate.connection.driver_class">org.gjt.mm.mysql.Driver</property>
<property name="hibernate.connection.password"></property>
<property name="hibernate.connection.url">jdbc:mysql://localhost/test</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
<property name="hibernate.transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory</property>
<property name="hibernate.current_session_context_class">thread</property>
<!--property name="hibernate.show_sql">true</property>
<property name="hibernate.format_sql">true</property-->
<property name="c3p0.min_size">3</property>
<property name="c3p0.max_size">5</property>
<property name="c3p0.timeout">1800</property>
<property name="c3p0.preferredTestQuery">SELECT 1</property>
<property name="c3p0.testConnectionOnCheckout">true</property>
<property name="c3p0.idle_test_period">100</property> <!-- seconds -->
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<property name="cache.use_query_cache">false</property>
<property name="cache.use_minimal_puts">false</property>
<property name="max_fetch_depth">10</property>
<property name="hibernate.hbm2ddl.auto">update</property>
<!-- classes removed -->
</session-factory>
The parameter I thought would have fixed it was the c3p0.idle_test_period -- It defaults to 0. However, we still have the Broken Pipe issue after 8 hours of running. While there are multiple posts index via Google, none arrive at a satisfactory answer.
So it turns out I was missing a key line that enabled c3p0 (the c3p0 parameters I was tweaking were having no effect because Hibernate was using it's built in connection pool -- which it appropriately warns is not suitable for production). In hibernate 2.x, setting the hibernate.c3p0.max_size property enabled c3p0 connection pooling. However, in 3.x you must specify the following property --
<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property>
Additionally, here are my final configuration parameters --
<property name="hibernate.c3p0.min_size">3</property>
<property name="hibernate.c3p0.max_size">5</property>
<property name="hibernate.c3p0.timeout">1800</property>
<property name="hibernate.c3p0.idle_test_period">100</property> <!-- seconds -->
It's rather unfortunate that both Hibernate and c3p0 have abysmal documentation in this regard.
There are two things going on here. You should read this article for more details, but the take-aways are:
You can adjust the MySQL wait_timeout setting to something larger than 8 hours, if desired.
The Hibernate settings should include "hibernate." before the "c3p0", e.g. hibernate.c3p0.idle_test_period instead of just c3p0.idle_test_period
This is a solution when you have a broken pipe because of combination of tomcat's wait_timeout=28800 sec(8h) and maxIdleTime=0 in c3p0:
I've changed the local tomcat wait_timeout via my.ini file to 120sec (2 min). And I placed the following:
maxIdleTime=100
idleConnectionTestPeriod=0 (same as default/as if it didn't exist)
other:
acquireIncrement=2
minPoolSize=2
maxPoolSize=5
maxIdleTimeExcessConnections=10
I had no problems with this setup.
I didn't need to use idleConnectionTestPeriod!
If tomcat's wait_timeout is 28800 sec, and maxIdleTime is 25200, it means that c3p0 will close the idle connection in 3600sec (1h) earlier, before tomcat throws a "broken pipe" exception. Isn't that right?!
As you can see I have no issues with providing only maxIdleTime.
Unfortunately, these:
maxIdleTime
idleConnectionTestPeriod
configuring_connection_testing
testConnectionOnCheckin
don't explain too much the corner cases.
And, btw, here is how to open the tomcat's my.ini file with Notepad++:
http://drupal.org/node/32715#comment-4907440
Cheers,
Despot
I've several problem -
- C3P0ConnectionProvider was not found
- I solve it by using the hibernate c3p0 version
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>3.5.6-Final</version>
</dependency>
<!-- c3p0 -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-c3p0</artifactId>
<version>3.3.1.GA</version>
</dependency>
- I have that wait_timeout issue on mysql. First I set /etc/my.cnf wait_timeout=10
then I changed the Idle time out value to lower than the wait_timeout value which < 10
That solved my problem.
<property name="hibernate.connection.provider_class" value="org.hibernate.connection.C3P0ConnectionProvider" /> <property name="hibernate.c3p0.acquire_increment" value="1" />
<property name="hibernate.c3p0.idle_test_period" value="28690"/>
<property name="hibernate.c3p0.timeout" value="1800" />
<property name="hibernate.c3p0.max_size" value="5" />
<property name="hibernate.c3p0.min_size" value="3" />
<property name="hibernate.c3p0.max_statement" value="50" />
<property name="hibernate.c3p0.preferredTestQuery" value="select 1;"/>
I was getting the same problem and it took time to figure out the solution.
I use Hibernate 4.0.1 and mysql 5.1(no spring framework) and I was facing the issue. First make sure that you configured the c3p0 jars properly which are essential.
I used these properties in hibernate.cfg.xml
<property name="hibernate.c3p0.validate">true</property>
<property name="hibernate.connection.provider_class">org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider</property>
<property name="hibernate.c3p0.min_size">5</property>
<property name="hibernate.c3p0.max_size">20</property>
<property name="hibernate.c3p0.max_statements">50</property>
<property name="hibernate.c3p0.preferredTestQuery">SELECT 1;</property>
<property name="hibernate.c3p0.testConnectionOnCheckout">true</property>
<property name="hibernate.c3p0.idle_test_period">10</property>
<property name="hibernate.c3p0.acquireRetryAttempts">5</property>
<property name="hibernate.c3p0.acquireRetryDelay">200</property>
<property name="hibernate.c3p0.timeout">40</property>
But it's of no use 'cause C3p0 was still taking the default properties not the properties which I set in hibernate.cfg.xml, You can check it in logs. So, I searched many websites for right solution and finally I came up with this. remove the C3p0 properties in cfg.xml and create c3p0-config.xml in the root path(along with cfg.xml) and set properties as follows.
<c3p0-config>
<default-config>
<property name="automaticTestTable">con_test</property>
<property name="checkoutTimeout">40</property>
<property name="idleConnectionTestPeriod">10</property>
<property name="initialPoolSize">10</property>
<property name="maxPoolSize">20</property>
<property name="minPoolSize">5</property>
<property name="maxStatements">50</property>
<property name="preferredTestQuery">SELECT 1;</property>
<property name="acquireRetryAttempts">5</property>
<property name="acquireRetryDelay">200</property>
<property name="maxIdleTime">30</property>
</default-config>
</c3p0-config>
but if you run, ORM takes the jdbc connection but not C3p0 connection pool 'cause we should add these properties in hibernate.cfg.xml
<property name="hibernate.c3p0.validate">true</property>
<property name="hibernate.connection.provider_class">org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider</property>
now everything works fine(At least it worked fine for me) and the issue is solved.
check the following for references.
http://www.mchange.com/projects/c3p0/index.html#configuring_connection_testing
https://community.jboss.org/wiki/HowToConfigureTheC3P0ConnectionPool
I hope this solves your problem.