Question

我在spring-mvc + jpa上有应用。我发动战争，并尝试从tomcat开始。

DataConfig：

import org.hibernate.ejb.HibernatePersistence;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.core.env.Environment;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
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.annotation.EnableTransactionManagement;

import javax.annotation.Resource;
import javax.persistence.EntityManagerFactory;
import javax.sql.DataSource;
import java.util.Properties;

@Configuration
@EnableTransactionManagement
@PropertySource("classpath:app.properties")
public class DataConfig {

    private static final String PROP_DATABASE_DRIVER = "db.driver";
    private static final String PROP_DATABASE_URL = "db.url";
    private static final String PROP_DATABASE_USERNAME = "db.username";
    private static final String PROP_HIBERNATE_DIALECT = "db.hibernate.dialect";
    private static final String PROP_HIBERNATE_SHOW_SQL = "db.hibernate.show_sql";
    private static final String PROP_ENTITYMANAGER_PACKAGES_TO_SCAN = "db.entitymanager.packages.to.scan";
    private static final String PROP_HIBERNATE_HBM2DDL_AUTO = "db.hibernate.hbm2ddl.auto";

    @Resource
    private Environment env;

    @Bean
    public DataSource dataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();

        dataSource.setDriverClassName(env.getRequiredProperty(PROP_DATABASE_DRIVER));
        dataSource.setUrl(env.getRequiredProperty(PROP_DATABASE_URL));
        dataSource.setUsername(env.getRequiredProperty(PROP_DATABASE_USERNAME));
        dataSource.setPassword(env.getRequiredProperty("db.password"));

        return dataSource;
    }

    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
        LocalContainerEntityManagerFactoryBean entityManager = new LocalContainerEntityManagerFactoryBean();
        entityManager.setDataSource(dataSource());
        entityManager.setPackagesToScan(env.getRequiredProperty(PROP_ENTITYMANAGER_PACKAGES_TO_SCAN));
        entityManager.setPersistenceProviderClass(HibernatePersistence.class);
        entityManager.setJpaVendorAdapter(new HibernateJpaVendorAdapter());
        entityManager.setJpaProperties(getHibernateProperties());
        return entityManager;

    }

    @Bean
    public JpaTransactionManager transactionManager(EntityManagerFactory entityManagerFactory) {
        JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(entityManagerFactory);
        return transactionManager;
    }

    private Properties getHibernateProperties() {
        Properties properties = new Properties();
        properties.put(PROP_HIBERNATE_DIALECT, env.getRequiredProperty(PROP_HIBERNATE_DIALECT));
        properties.put(PROP_HIBERNATE_SHOW_SQL, env.getRequiredProperty(PROP_HIBERNATE_SHOW_SQL));
        properties.put(PROP_HIBERNATE_HBM2DDL_AUTO, env.getRequiredProperty(PROP_HIBERNATE_HBM2DDL_AUTO));

        return properties;
    }

}

app.properties是：

#DB properties:
db.driver=com.mysql.cj.jdbc.Driver
db.url=jdbc:mysql://127.0.0.1:3306/mydb
db.username=root
db.password=111111

#Hibernate Configuration:

db.hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
db.hibernate.show_sql=true
db.entitymanager.packages.to.scan=ru.sbrf.risks.services.data.model
db.hibernate.hbm2ddl.auto = create-drop

因此，tomcat日志中有错误消息：

原因：javax.persistence.PersistenceException：[PersistenceUnit：默认值]无法在以下位置构建EntityManagerFactory org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory（Ejb3Configuration.java:924）在 org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory（Ejb3Configuration.java:899）在 org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory（HibernatePersistence.java:76）在 org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory（LocalContainerEntityManagerFactoryBean.java:287）在 org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet（AbstractEntityManagerFactoryBean.java:310）在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods（AbstractAutowireCapableBeanFactory.java:1612）在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean（AbstractAutowireCapableBeanFactory.java:1549） ... 57更多原因：org.hibernate.HibernateException：连接如果未将'hibernate.dialect'设置为，则不能为null org.hibernate.service.jdbc.dialect.internal.DialectFactoryImpl.determineDialect（DialectFactoryImpl.java:97）在 org.hibernate.service.jdbc.dialect.internal.DialectFactoryImpl.buildDialect（DialectFactoryImpl.java:67）在 org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure（JdbcServicesImpl.java:170）在 org.hibernate.service.internal.StandardServiceRegistryImpl.configureService（StandardServiceRegistryImpl.java:75）在 org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService（AbstractServiceRegistryImpl.java:159）在 org.hibernate.service.internal.AbstractServiceRegistryImpl.getService（AbstractServiceRegistryImpl.java:131）在 org.hibernate.cfg.Configuration.buildTypeRegistrations（Configuration.java:1818）在 org.hibernate.cfg.Configuration.buildSessionFactory（Configuration.java:1776）在 org.hibernate.ejb.EntityManagerFactoryImpl。（EntityManagerFactoryImpl.java:96）在 org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory（Ejb3Configuration.java:914） ...还有63个

Answer 1

Hibernate无法理解您要传递的属性。您已将hibernate.dialect定义为db.hibernate.dialect，删除了db部分，并将其命名为hibernate.dialect，并对其他与休眠相关的属性进行了相同的操作。

https://docs.jboss.org/hibernate/orm/3.3/reference/en-US/html/session-configuration.html

Answer 2

@PropertySource("classpath:app.properties")

此注释值替换为以下传递值

@PropertySource(value = {"classpath:application.properties","file:config/application.properties"}, ignoreResourceNotFound = true)

并重建您的项目。现在一切正常。

尝试启动Tomcat时出现休眠异常

2 个答案: