Exception:Connections could not be acquired from the underlying database!

**sofien** · 06/08/2008, 13h25

Bonjour voilà le contenu de la console sous eclipse quand j'éxécute le client...

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6 août 2008 13:02:48 org.hibernate.cfg.Environment <clinit>
INFO: Hibernate 3.2.4.sp1
6 août 2008 13:02:48 org.hibernate.cfg.Environment <clinit>
INFO: hibernate.properties not found
6 août 2008 13:02:48 org.hibernate.cfg.Environment buildBytecodeProvider
INFO: Bytecode provider name : cglib
6 août 2008 13:02:48 org.hibernate.cfg.Environment <clinit>
INFO: using JDK 1.4 java.sql.Timestamp handling
6 août 2008 13:02:48 org.hibernate.cfg.Configuration configure
INFO: configuring from resource: /hibernate.cfg.xml
6 août 2008 13:02:48 org.hibernate.cfg.Configuration getConfigurationInputStream
INFO: Configuration resource: /hibernate.cfg.xml
6 août 2008 13:02:48 org.hibernate.cfg.Configuration addResource
INFO: Reading mappings from resource : com/dao/FBEleve/Eleve.hbm.xml
6 août 2008 13:02:48 org.hibernate.cfg.HbmBinder bindRootPersistentClassCommonValues
INFO: Mapping class: com.dao.FBEleve.Eleve -> fb_eleves
6 août 2008 13:02:48 org.hibernate.cfg.Configuration doConfigure
INFO: Configured SessionFactory: null
6 août 2008 13:02:48 org.hibernate.connection.C3P0ConnectionProvider configure
INFO: C3P0 using driver: com.mysql.jdbc.Driver at URL: jdbc:mysql://172.16.0.43:3306/test"
6 août 2008 13:02:48 org.hibernate.connection.C3P0ConnectionProvider configure
INFO: Connection properties: {user=root, password=****}
6 août 2008 13:02:48 org.hibernate.connection.C3P0ConnectionProvider configure
INFO: autocommit mode: false
6 août 2008 13:02:49 com.mchange.v2.log.MLog <clinit>
INFO: MLog clients using java 1.4+ standard logging.
6 août 2008 13:02:49 com.mchange.v2.c3p0.C3P0Registry banner
INFO: Initializing c3p0-0.9.0 [built 11-July-2005 00:43:29 -0400; debug? true; trace: 10]
6 août 2008 13:02:49 com.mchange.v2.c3p0.PoolBackedDataSource getPoolManager
INFO: Initializing c3p0 pool... com.mchange.v2.c3p0.PoolBackedDataSource@47393f [ connectionPoolDataSource -> com.mchange.v2.c3p0.WrapperConnectionPoolDataSource@64f6cd [ acquireIncrement -> 3, acquireRetryAttempts -> 30, acquireRetryDelay -> 1000, autoCommitOnClose -> false, automaticTestTable -> null, breakAfterAcquireFailure -> false, checkoutTimeout -> 0, connectionTesterClassName -> com.mchange.v2.c3p0.impl.DefaultConnectionTester, factoryClassLocation -> null, forceIgnoreUnresolvedTransactions -> false, identityToken -> 64f6cd, idleConnectionTestPeriod -> 3000, initialPoolSize -> 5, maxIdleTime -> 300, maxPoolSize -> 20, maxStatements -> 50, maxStatementsPerConnection -> 0, minPoolSize -> 5, nestedDataSource -> com.mchange.v2.c3p0.DriverManagerDataSource@a61164 [ description -> null, driverClass -> null, factoryClassLocation -> null, identityToken -> a61164, jdbcUrl -> jdbc:mysql://172.16.0.43:3306/test", properties -> {user=******, password=******} ], preferredTestQuery -> null, propertyCycle -> 300, testConnectionOnCheckin -> false, testConnectionOnCheckout -> false, usesTraditionalReflectiveProxies -> false ], factoryClassLocation -> null, identityToken -> 47393f, numHelperThreads -> 3 ]
6 août 2008 13:03:18 com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask run
ATTENTION: com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@5f8172 -- 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).
6 août 2008 13:03:18 org.hibernate.cfg.SettingsFactory buildSettings
ATTENTION: Could not obtain connection metadata
java.sql.SQLException: Connections could not be acquired from the underlying database!
	at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:104)
	at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:236)
	at com.mchange.v2.c3p0.PoolBackedDataSource.getConnection(PoolBackedDataSource.java:94)
	at org.hibernate.connection.C3P0ConnectionProvider.getConnection(C3P0ConnectionProvider.java:56)
	at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:84)
	at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2009)
	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1292)
	at persistence.HibernateUtil.<clinit>(HibernateUtil.java:15)
	at com.dao.FBEleve.Client.main(Client.java:31)
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.awaitAcquire(BasicResourcePool.java:970)
	at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:208)
	at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:232)
	... 7 more
6 août 2008 13:03:18 org.hibernate.dialect.Dialect <init>
INFO: Using dialect: org.hibernate.dialect.MySQL5InnoDBDialect
6 août 2008 13:03:18 com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask run
ATTENTION: com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@1a5f739 -- 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).
6 août 2008 13:03:18 org.hibernate.transaction.TransactionFactoryFactory buildTransactionFactory
INFO: Using default transaction strategy (direct JDBC transactions)
6 août 2008 13:03:18 org.hibernate.transaction.TransactionManagerLookupFactory getTransactionManagerLookup
INFO: No TransactionManagerLookup configured (in JTA environment, use of read-write or transactional second-level cache is not recommended)
6 août 2008 13:03:18 org.hibernate.cfg.SettingsFactory buildSettings
INFO: Automatic flush during beforeCompletion(): disabled
6 août 2008 13:03:18 org.hibernate.cfg.SettingsFactory buildSettings
INFO: Automatic session close at end of transaction: disabled
6 août 2008 13:03:18 org.hibernate.cfg.SettingsFactory buildSettings
INFO: Scrollable result sets: disabled
6 août 2008 13:03:18 org.hibernate.cfg.SettingsFactory buildSettings
INFO: JDBC3 getGeneratedKeys(): disabled
6 août 2008 13:03:18 org.hibernate.cfg.SettingsFactory buildSettings
INFO: Connection release mode: auto
6 août 2008 13:03:18 org.hibernate.cfg.SettingsFactory buildSettings
INFO: Maximum outer join fetch depth: 2
6 août 2008 13:03:18 org.hibernate.cfg.SettingsFactory buildSettings
INFO: Default batch fetch size: 1
6 août 2008 13:03:18 org.hibernate.cfg.SettingsFactory buildSettings
INFO: Generate SQL with comments: enabled
6 août 2008 13:03:18 org.hibernate.cfg.SettingsFactory buildSettings
INFO: Order SQL updates by primary key: disabled
6 août 2008 13:03:18 org.hibernate.cfg.SettingsFactory buildSettings
INFO: Order SQL inserts for batching: disabled
6 août 2008 13:03:18 org.hibernate.cfg.SettingsFactory createQueryTranslatorFactory
INFO: Query translator: org.hibernate.hql.ast.ASTQueryTranslatorFactory
6 août 2008 13:03:18 org.hibernate.hql.ast.ASTQueryTranslatorFactory <init>
INFO: Using ASTQueryTranslatorFactory
6 août 2008 13:03:18 org.hibernate.cfg.SettingsFactory buildSettings
INFO: Query language substitutions: {}
6 août 2008 13:03:18 org.hibernate.cfg.SettingsFactory buildSettings
INFO: JPA-QL strict compliance: disabled
6 août 2008 13:03:18 org.hibernate.cfg.SettingsFactory buildSettings
INFO: Second-level cache: enabled
6 août 2008 13:03:18 org.hibernate.cfg.SettingsFactory buildSettings
INFO: Query cache: disabled
6 août 2008 13:03:18 org.hibernate.cfg.SettingsFactory createCacheProvider
INFO: Cache provider: org.hibernate.cache.NoCacheProvider
6 août 2008 13:03:18 org.hibernate.cfg.SettingsFactory buildSettings
INFO: Optimize cache for minimal puts: disabled
6 août 2008 13:03:18 org.hibernate.cfg.SettingsFactory buildSettings
INFO: Structured second-level cache entries: disabled
6 août 2008 13:03:18 org.hibernate.cfg.SettingsFactory buildSettings
INFO: Echoing all SQL to stdout
6 août 2008 13:03:18 org.hibernate.cfg.SettingsFactory buildSettings
INFO: Statistics: disabled
6 août 2008 13:03:18 org.hibernate.cfg.SettingsFactory buildSettings
INFO: Deleted entity synthetic identifier rollback: disabled
6 août 2008 13:03:18 org.hibernate.cfg.SettingsFactory buildSettings
INFO: Default entity-mode: pojo
6 août 2008 13:03:18 org.hibernate.cfg.SettingsFactory buildSettings
INFO: Named query checking : enabled
6 août 2008 13:03:18 org.hibernate.impl.SessionFactoryImpl <init>
INFO: building session factory
6 août 2008 13:03:18 org.hibernate.impl.SessionFactoryObjectFactory addInstance
INFO: Not binding factory to JNDI, no JNDI name configured
6 août 2008 13:03:48 com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask run
ATTENTION: com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@c5495e -- 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).
6 août 2008 13:03:48 org.hibernate.util.JDBCExceptionReporter logExceptions
ATTENTION: SQL Error: 0, SQLState: null
6 août 2008 13:03:48 org.hibernate.util.JDBCExceptionReporter logExceptions
GRAVE: Connections could not be acquired from the underlying database!
Exception in thread "main" org.hibernate.exception.GenericJDBCException: Cannot open connection
	at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:103)
	at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:91)
	at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
	at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:29)
	at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:426)
	at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:144)
	at org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:119)
	at org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:57)
	at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1326)
	at com.dao.FBEleve.Client.main(Client.java:33)
Caused by: java.sql.SQLException: Connections could not be acquired from the underlying database!
	at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:104)
	at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:236)
	at com.mchange.v2.c3p0.PoolBackedDataSource.getConnection(PoolBackedDataSource.java:94)
	at org.hibernate.connection.C3P0ConnectionProvider.getConnection(C3P0ConnectionProvider.java:56)
	at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:423)
	... 5 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.awaitAcquire(BasicResourcePool.java:970)
	at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:208)
	at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:232)
	... 8 more

Ceci est le code source du client

Code :

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package com.dao.FBEleve;
 
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import persistence.HibernateUtil;
 
public class Client {
 
	/**
	 * @param args
	 */
	@SuppressWarnings("deprecation")
	public static void main(String[] args) {
		MySQLDAOFatory factory = new MySQLDAOFatory();
		EleveDAO dao = factory.getEleveDAO();
		dao.execute();
		Eleve elv = new Eleve(12, "HAMMAMI Sofien");
		System.out.println(elv.toString());
		Session session = null;
		SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
		session = sessionFactory.openSession();
		Transaction tx = session.beginTransaction();
		session.save(elv);
		tx.commit();		
		System.out.println(sessionFactory == null);
		System.out.println("session is open " + session.isOpen());
		session.close();
	}
}

une idée svp? merci

**vincent.caron** · 09/10/2008, 10h46

Est-ce que cela ne pourrait-il pas venir du nombre maximum de connexions MySQL autorisées pour votre client ?
Pouvez-vous essayer de l'augmenter sur votre serveur MySQL, ou de diminuer le nombre de connexion du pool C3P0 ?

Dans fichier hibernate.cfg.xml :

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<property name="c3p0.min_size">1</property> 
<property name="c3p0.max_size">3</property>

Exception:Connections could not be acquired from the underlying database!

MySQL

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