this is my hibernate.cfg.xml
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://192.168.0.23:3306/meili_s?useUnicode=true&characterEncoding=UTF-8</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">password</property>
<property name="show_sql">false</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<property name="hibernate.c3p0.min_size">5</property>
<property name="hibernate.c3p0.max_size">50</property>
<property name="hibernate.c3p0.maxStatementsPerConnection">30</property>
<property name="hibernate.c3p0.timeout">3600</property> <!-- seconds -->
<property name="hibernate.c3p0.idle_test_period">300</property> <!-- seconds -->
<property name="hibernate.c3p0.testConnectionOnCheckin">true</property>
<property name="hibernate.c3p0.preferredTestQuery">select 1;</property>
<property name="connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property>
The problem is that when the "hibernate.connection.url" has the IP address (of my VM) like just "localhost" all works but when it is an IP number (except for 127.0.0.1) i get this error:
Caused by: java.sql.SQLException: Connections could not be acquired from the underlying database!
at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:529)
at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:128)
at org.hibernate.connection.C3P0ConnectionProvider.getConnection(C3P0ConnectionProvider.java:78)
at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:446)
... 45 more
Caused by: com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acquire a resource from its primary factory or source.
at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1319)
at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:557)
at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:477)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:525)
... 48 more
have you ever had some issue?
thanks lot in advance.
Related
I am developing a web application and my stack is Mysql+ hibernate+ spring. I noticed that each time i start my tomcat a new database session is created.
my application.context xml has the following configuration
<bean class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close" id="dataSource">
<property name="driverClassName" value="${database.driverClassName}"/>
<property name="url" value="${database.url}"/>
<property name="username" value="${database.username}"/>
<property name="password" value="${database.password}"/>
<property name="testOnBorrow" value="true"/>
<property name="testOnReturn" value="true"/>
<property name="testWhileIdle" value="true"/>
<property name="timeBetweenEvictionRunsMillis" value="1800000"/>
<property name="numTestsPerEvictionRun" value="3"/>
<property name="minEvictableIdleTimeMillis" value="1800000"/>
<property name="validationQuery" value="SELECT 1"/>
<property name="maxActive" value="15" />
<property name="removeAbandoned" value="true" />
<property name="removeAbandonedTimeout" value="60" />
<property name="logAbandoned" value="true" />
</bean>
<bean class="org.springframework.orm.jpa.JpaTransactionManager" id="transactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory"/>
</bean>
Any help is much appreciated
There could be two possibilities.
Either your application is executing queries on start up. This can be verified by turning on hibernate/spring logging.
The default minIdle/initialSize connection property of the connection pool is 1. Initial size refers to the initial number of connections created when the pool is started while minIdle refers minimum number of connections that can remain idle in the pool, without extra ones being created
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.
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.
I'm getting com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.Connection was implicitly closed by the driver error after sometime in my webapp. That "sometime" was 8 hrs but i found out that by default, the server closes the connection after eight hours if nothing has happened. So i changed "wait_timeout" to 30 sec. and changed hibernate.c3p0.idle_test_period property in hibernate.cfg.xml to 10 sec
Here's my hibernate.cfg.xml properties
<property name="connection.pool_size">20</property>
<property name="hibernate.connection.zeroDateTimeBehavior">
convertToNull
</property>
<property>
name="connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider
</property>
<property name="hibernate.c3p0.min_size">5</property>
<property name="hibernate.c3p0.max_size">50</property>
<property name="hibernate.c3p0.timeout">15</property>
<property name="hibernate.c3p0.max_idle_time">18</property>
<property name="hibernate.c3p0.max_statements">50</property>
<property name="hibernate.c3p0.idle_test_period">10</property>
Here's my c3p0 properties
c3p0.preferredTestQuery = SELECT 1;
But i'm still getting the same error
I've started learning hibernate. Here is my hibernate-configuration file:
<hibernate-configuration>
<session-factory>
<!-- connection settings -->
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost:3306/hibernatelearning</property>
<property name="connection.name">root</property>
<property name="connection.password"></property>
<!-- JDBC connection pool -->
<property name="connection.pool_size">1</property>
<!-- dialect -->
<property name="dialect">org.hibernate.dialect.HSQLDialect</property>
<property name="show_sql">true</property>
<property name="current_session_context_class">thread</property>
<mapping resource="./Event.hbm.xml"/>
</session-factory>
</hibernate-configuration>
The exception is:
INFO: connection properties: {name=root, password=****}
22.03.2011 15:45:14 org.hibernate.cfg.SettingsFactory buildSettings
WARNING: Could not obtain connection to query metadata
com.mysql.jdbc.exceptions.MySQLSyntaxErrorException: Access denied for user ''#'localhost' to database 'hibernatelearning'
Does anybody know how to deal with it?
The problem was in hibernate.cfg.xml. The right one:
<session-factory>
<!-- connection settings -->
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernatelearning</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password"></property>
<property name="hibernate.hbm2ddl.auto">create-drop</property>
<!-- JDBC connection pool -->
<property name="connection.pool_size">1</property>
<!-- dialect -->
<property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>
<property name="show_sql">true</property>
<property name="current_session_context_class">thread</property>
<mapping resource="./Event.hbm.xml"/>
</session-factory>