JpaConfig.java

package com.raysmond.blog;

import java.util.Properties;

import javax.sql.DataSource;

import com.raysmond.blog.Application;
import com.zaxxer.hikari.HikariConfig;
import com.zaxxer.hikari.HikariDataSource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
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;
import org.springframework.transaction.annotation.TransactionManagementConfigurer;

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(basePackageClasses = Application.class)
class JpaConfig implements TransactionManagementConfigurer {

    @Value("${spring.dataSource.driverClassName}")
    private String driver;
    @Value("${spring.dataSource.url}")
    private String url;
    @Value("${spring.dataSource.username}")
    private String username;
    @Value("${spring.dataSource.password}")
    private String password;
    @Value("${spring.hibernate.dialect}")
    private String dialect;
    @Value("${spring.hibernate.hbm2ddl.auto}")
    private String hbm2ddlAuto;
    @Value("${spring.hibernate.show_sql}")
    private Boolean showSql;

    @Bean
    public DataSource configureDataSource() {
        HikariConfig config = new HikariConfig();
        config.setDriverClassName(driver);
        config.setJdbcUrl(url);
        config.setUsername(username);
        config.setPassword(password);

        config.addDataSourceProperty("useUnicode", "true");
        config.addDataSourceProperty("characterEncoding", "utf8");
        config.addDataSourceProperty("cachePrepStmts", "true");
        config.addDataSourceProperty("prepStmtCacheSize", "250");
        config.addDataSourceProperty("prepStmtCacheSqlLimit", "2048");
        config.addDataSourceProperty("useServerPrepStmts", "true");

        return new HikariDataSource(config);
    }

    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
        LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
        entityManagerFactoryBean.setDataSource(configureDataSource());
        entityManagerFactoryBean.setPackagesToScan("com.raysmond.blog");
        entityManagerFactoryBean.setJpaVendorAdapter(new HibernateJpaVendorAdapter());

        Properties jpaProperties = new Properties();
        jpaProperties.put(org.hibernate.cfg.Environment.DIALECT, dialect);
        jpaProperties.put(org.hibernate.cfg.Environment.HBM2DDL_AUTO, hbm2ddlAuto);
        jpaProperties.put(org.hibernate.cfg.Environment.SHOW_SQL, showSql);
        entityManagerFactoryBean.setJpaProperties(jpaProperties);

        return entityManagerFactoryBean;
    }

    @Bean(name = "transactionManager")
    public PlatformTransactionManager annotationDrivenTransactionManager() {
        return new JpaTransactionManager();
    }
}