Hibernate exception when try to launch Tomcat - spring

Question

I have application on spring-mvc+jpa. I build war and try to start on tomcat.
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 is:
#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
So, there is error message in tomcat logs:
Caused by: javax.persistence.PersistenceException: [PersistenceUnit:
default] Unable to build EntityManagerFactory at
org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:924)
at
org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:899)
at
org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:76)
at
org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:287)
at
org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:310)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1612)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1549)
... 57 more Caused by: org.hibernate.HibernateException: Connection
cannot be null when 'hibernate.dialect' not set at
org.hibernate.service.jdbc.dialect.internal.DialectFactoryImpl.determineDialect(DialectFactoryImpl.java:97)
at
org.hibernate.service.jdbc.dialect.internal.DialectFactoryImpl.buildDialect(DialectFactoryImpl.java:67)
at
org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:170)
at
org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:75)
at
org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:159)
at
org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:131)
at
org.hibernate.cfg.Configuration.buildTypeRegistrations(Configuration.java:1818)
at
org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1776)
at
org.hibernate.ejb.EntityManagerFactoryImpl.(EntityManagerFactoryImpl.java:96)
at
org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:914)
... 63 more

Answer 1

Hibernate doesn't understand the properties you are passing it. You have hibernate.dialect defined as db.hibernate.dialect Remove the db portion and just have it as hibernate.dialect and do the same with your other hibernate related properties.
https://docs.jboss.org/hibernate/orm/3.3/reference/en-US/html/session-configuration.html

Answer 2

#PropertySource("classpath:app.properties")
This annotation value replace with below passing value
#PropertySource(value = {"classpath:application.properties","file:config/application.properties"}, ignoreResourceNotFound = true)
and rebuild you project.now it's working fine.