在Java中创建EntityManagerFactoryBean时使用hibernate.c3p0
我最近从.Net世界转到了Java世界 我已经建立了一个核心项目，这是由多个客户端（网络客户端，api，…）使用 这样做让我厌倦了在多个项目中配置数据访问bean和连接字符串。目标是包含我的“coreproject.jar”，并能够使用它，而无需配置数据访问bean和连接字符串 我发现：（好像Web服务器atm有问题。） 这就产生了这段代码，这段代码有效并完成了我的目标 BaseRepository在Java中创建EntityManagerFactoryBean时使用hibernate.c3p0,java,spring,hibernate,jpa,c3p0,Java,Spring,Hibernate,Jpa,C3p0,我最近从.Net世界转到了Java世界 我已经建立了一个核心项目，这是由多个客户端（网络客户端，api，…）使用 这样做让我厌倦了在多个项目中配置数据访问bean和连接字符串。目标是包含我的“coreproject.jar”，并能够使用它，而无需配置数据访问bean和连接字符串 我发现：（好像Web服务器atm有问题。） 这就产生了这段代码，这段代码有效并完成了我的目标 BaseRepository package com.company.core.data.repositories; im
package com.company.core.data.repositories;
import javax.persistence.EntityManagerFactory;
import javax.persistence.PersistenceUnit;
public abstract class BaseRepository {
protected EntityManagerFactory emf;
@PersistenceUnit
public void setEntityManagerFactory(EntityManagerFactory emf) {
this.emf = emf;
}
}
package com.company.core.data.repositories;
import com.company.core.data.interfaces.IUserRepository;
import com.company.core.data.pojos.UserPojo;
import org.springframework.stereotype.Component;
import javax.persistence.EntityManager;
import javax.persistence.EntityTransaction;
import java.util.List;
@Component
public class UserRepository extends BaseRepository implements IUserRepository {
public UserPojo getByEmail(String email) throws Exception {
EntityManager em = emf.createEntityManager();
List<UserPojo> results = em.createQuery("FROM UserPojo u WHERE u.email = ?", UserPojo.class)
.setParameter(1, email)
.getResultList();
em.close();
return firstOrDefault(results);
}
public static <T> T firstOrDefault(List<T> list){
if(list.size() > 0)
return list.get(0);
return null;
}
}
package com.company.core.data.repositories;
import javax.persistence.EntityManagerFactory;
import javax.persistence.PersistenceUnit;
public abstract class BaseRepository {
protected EntityManagerFactory emf;
@PersistenceUnit
public void setEntityManagerFactory(EntityManagerFactory emf) {
this.emf = emf;
}
}
package com.company.core.data.repositories;
import com.company.core.data.interfaces.IUserRepository;
import com.company.core.data.pojos.UserPojo;
import org.springframework.stereotype.Component;
import javax.persistence.EntityManager;
import javax.persistence.EntityTransaction;
import java.util.List;
@Component
public class UserRepository extends BaseRepository implements IUserRepository {
public UserPojo getByEmail(String email) throws Exception {
EntityManager em = emf.createEntityManager();
List<UserPojo> results = em.createQuery("FROM UserPojo u WHERE u.email = ?", UserPojo.class)
.setParameter(1, email)
.getResultList();
em.close();
return firstOrDefault(results);
}
public static <T> T firstOrDefault(List<T> list){
if(list.size() > 0)
return list.get(0);
return null;
}
}
package com.company.core.configuration;
import java.util.Properties;
import javax.persistence.EntityManagerFactory;
import javax.sql.DataSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
@Configuration
@EnableTransactionManagement
@ComponentScan({"com.company.core.data"})
public class EntityManagerFactoryConfiguration {
public EntityManagerFactoryConfiguration() {
super();
}
@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
final LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
em.setDataSource(dataSource());
em.setPackagesToScan(new String[]{"com.company.core.data.pojos"});
final HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
em.setJpaVendorAdapter(vendorAdapter);
Properties hibernateProperties = new Properties();
hibernateProperties.setProperty("hibernate.dialect", "org.hibernate.dialect.MySQL5InnoDBDialect");
hibernateProperties.setProperty("hibernate.show_sql", "false");
// hibernateProperties.setProperty("hibernate.connection.provider_class", "org.hibernate.connection.C3P0ConnectionProvider");
// hibernateProperties.setProperty("hibernate.c3p0.max_size", "100");
// hibernateProperties.setProperty("hibernate.c3p0.min_size", "0");
// hibernateProperties.setProperty("hibernate.c3p0.acquire_increment", "1");
// hibernateProperties.setProperty("hibernate.c3p0.idle_test_period", "200");
// hibernateProperties.setProperty("hibernate.c3p0.max_statements", "0");
// hibernateProperties.setProperty("hibernate.c3p0.timeout", "300");
em.setJpaProperties(hibernateProperties);
return em;
}
@Bean
public DataSource dataSource() {
final org.springframework.jdbc.datasource.DriverManagerDataSource dataSource = new org.springframework.jdbc.datasource.DriverManagerDataSource();
dataSource.setDriverClassName("com.mysql.jdbc.Driver");
dataSource.setUrl("jdbc:mysql://127.0.0.1/databasename?autoReconnect=true");
dataSource.setUsername("user");
dataSource.setPassword("password");
return dataSource;
}
@Bean
public DataSource c3p0dataSource() {
final com.mchange.v2.c3p0.DriverManagerDataSource dataSource = new com.mchange.v2.c3p0.DriverManagerDataSource();
dataSource.setDriverClass("com.mysql.jdbc.Driver");
dataSource.setJdbcUrl("jdbc:mysql://127.0.0.1/databasename?autoReconnect=true");
dataSource.setUser("user");
dataSource.setPassword("password");
return dataSource;
}
@Bean
public PlatformTransactionManager transactionManager(final EntityManagerFactory emf) {
final JpaTransactionManager transactionManager = new JpaTransactionManager();
transactionManager.setEntityManagerFactory(emf);
return transactionManager;
}
@Bean
public PersistenceExceptionTranslationPostProcessor exceptionTranslation() {
return new PersistenceExceptionTranslationPostProcessor();
}
}
javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: Could not open connection
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1763)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1677)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:1771)
at org.hibernate.jpa.internal.TransactionImpl.begin(TransactionImpl.java:64)
at com.company.core.data.repositories.UserRepository.getByEmail(UserRepository.java:30)
at com.company.core.business.implementations.UserService.getByEmail(UserService.java:18)
at com.company.api.UserController.getByEmail(UserController.java:34)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
at org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver.doResolveHandlerMethodException(ExceptionHandlerExceptionResolver.java:362)
at org.springframework.web.servlet.handler.AbstractHandlerMethodExceptionResolver.doResolveException(AbstractHandlerMethodExceptionResolver.java:60)
at org.springframework.web.servlet.handler.AbstractHandlerExceptionResolver.resolveException(AbstractHandlerExceptionResolver.java:138)
at org.springframework.web.servlet.DispatcherServlet.processHandlerException(DispatcherServlet.java:1183)
at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1020)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:971)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:868)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:186)
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:668)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:283)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2463)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2452)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.hibernate.exception.GenericJDBCException: Could not open connection
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:54)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:126)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:112)
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:235)
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.getConnection(LogicalConnectionImpl.java:171)
at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.doBegin(JdbcTransaction.java:67)
at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.begin(AbstractTransactionImpl.java:162)
at org.hibernate.internal.SessionImpl.beginTransaction(SessionImpl.java:1435)
at org.hibernate.jpa.internal.TransactionImpl.begin(TransactionImpl.java:61)
... 50 more
Caused by: java.sql.SQLException: Connections could not be acquired from the underlying database!
at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:118)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:689)
at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:140)
at org.hibernate.c3p0.internal.C3P0ConnectionProvider.getConnection(C3P0ConnectionProvider.java:90)
at org.hibernate.internal.AbstractSessionImpl$NonContextualJdbcConnectionAccess.obtainConnection(AbstractSessionImpl.java:380)
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:228)
... 55 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:1418)
at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:606)
at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:526)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutAndMarkConnectionInUse(C3P0PooledConnectionPool.java:755)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:682)
... 59 more
<beans:bean id="emf" class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean">
<beans:property name="persistenceUnitName" value="DataSource"/>
</beans:bean>
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"
version="2.1">
<persistence-unit name="DataSource">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<properties>
<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
<property name="javax.persistence.jdbc.url" value="jdbc:mysql://127.0.0.1/database?autoReconnect=true" />
<property name="javax.persistence.jdbc.user" value="user" />
<property name="javax.persistence.jdbc.password" value="password" />
<!-- Important -->
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5InnoDBDialect" />
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.connection.provider_class" value="org.hibernate.connection.C3P0ConnectionProvider" />
<property name="hibernate.c3p0.max_size" value="100" />
<property name="hibernate.c3p0.min_size" value="0" />
<property name="hibernate.c3p0.acquire_increment" value="1" />
<property name="hibernate.c3p0.idle_test_period" value="300" />
<property name="hibernate.c3p0.max_statements" value="0" />
<property name="hibernate.c3p0.timeout" value="100" />
</properties>
</persistence-unit>
</persistence>
<beans:bean id="emf" class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean">
<beans:property name="persistenceUnitName" value="DataSource"/>
</beans:bean>
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"
version="2.1">
<persistence-unit name="DataSource">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<properties>
<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
<property name="javax.persistence.jdbc.url" value="jdbc:mysql://127.0.0.1/database?autoReconnect=true" />
<property name="javax.persistence.jdbc.user" value="user" />
<property name="javax.persistence.jdbc.password" value="password" />
<!-- Important -->
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5InnoDBDialect" />
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.connection.provider_class" value="org.hibernate.connection.C3P0ConnectionProvider" />
<property name="hibernate.c3p0.max_size" value="100" />
<property name="hibernate.c3p0.min_size" value="0" />
<property name="hibernate.c3p0.acquire_increment" value="1" />
<property name="hibernate.c3p0.idle_test_period" value="300" />
<property name="hibernate.c3p0.max_statements" value="0" />
<property name="hibernate.c3p0.timeout" value="100" />
</properties>
</persistence-unit>
</persistence>
org.hibernate.jpa.HibernatePersistenceProvider
数据源即可。使用com.mchange.v2.C3P0.ComboPooledDataSource
，因为这是一个正确的连接池。我刚刚尝试过，但仍然得到此异常。“com.mchange.v2.resourcepool.CannotAcquireResourceException:资源池无法从其主工厂或源获取资源。”：-（SessionFactory如何影响EntityManagerFactory？可能需要在EntityManagerFactory中更深层地设置连接池？添加完整的堆栈跟踪和您尝试过的代码/配置。在管理数据时，您不应该在hibernate中乱搞c3p0
和connection
属性你好！我用所有的代码和完整的堆栈跟踪更新了我的问题，所以这是使用“com.mchange.v2.c3p0.ComboPooledDataSource”