@Component

public class TenantIdentifierResolver implements CurrentTenantIdentifierResolver {

    @Override

    public String resolveCurrentTenantIdentifier() {

        String tenantId = TenantContext.getCurrentTenant();

        if (tenantId != null) {

            return tenantId;

        }

        return DEFAULT_TENANT_ID;

    }

    @Override

    public boolean validateExistingCurrentSessions() {

        return true;

    }

}

@Component
@Profile("prod")
public class MultiTenantConnectionProviderImpl implements MultiTenantConnectionProvider {
    private static final long serialVersionUID = 3193007611085791247L;
    private Logger log = LogManager.getLogger();

    private Map<String, HikariDataSource> dataSourceMap = new ConcurrentHashMap<String, HikariDataSource>();

    @Autowired
    private TenantRestClient tenantRestClient;

    @Autowired
    private PasswordEncrypt passwordEncrypt;

    @Override
    public void releaseAnyConnection(Connection connection) throws SQLException {
        connection.close();
    }

    @Override
    public Connection getAnyConnection() throws SQLException {
        Connection connection = getDataSource(TenantIdResolver.TENANT_DEFAULT).getConnection();
        return connection;

    }

    @Override
    public Connection getConnection(String tenantId) throws SQLException {
        Connection connection = getDataSource(tenantId).getConnection();
        return connection;
    }

    @Override
    public void releaseConnection(String tenantId, Connection connection) throws SQLException {
        log.info("releaseConnection " + tenantId);
        connection.close();
    }

    @Override
    public boolean supportsAggressiveRelease() {
        return false;
    }

    @Override
    public boolean isUnwrappableAs(Class unwrapType) {
        return false;
    }

    @Override
    public <T> T unwrap(Class<T> unwrapType) {
        return null;
    }

    public HikariDataSource getDataSource(@NotNull String tentantId) throws SQLException {
        if (dataSourceMap.containsKey(tentantId)) {
            return dataSourceMap.get(tentantId);
        } else {
            HikariDataSource dataSource = createDataSource(tentantId);
            dataSourceMap.put(tentantId, dataSource);
            return dataSource;
        }
    }

    public HikariDataSource createDataSource(String tenantId) throws SQLException {
        log.info("Create Datasource for tenant {}", tenantId);
        try {
            Database database = tenantRestClient.getDatabase(tenantId);
            DatabaseInstance databaseInstance = tenantRestClient.getDatabaseInstance(tenantId);
            if (database != null && databaseInstance != null) {
                HikariConfig hikari = new HikariConfig();
                String driver = "";
                String options = "";
                switch (databaseInstance.getType()) {
                case MYSQL:
                    driver = "jdbc:mysql://";
                    options = "?useLegacyDatetimeCode=false&serverTimezone=UTC&useUnicode=yes&characterEncoding=UTF-8&useSSL=false";
                    break;

                default:
                    driver = "jdbc:mysql://";
                    options = "?useLegacyDatetimeCode=false&serverTimezone=UTC&useUnicode=yes&characterEncoding=UTF-8&useSSL=false";
                }

                hikari.setJdbcUrl(driver + databaseInstance.getHost() + ":" + databaseInstance.getPort() + "/" + database.getName() + options);
                hikari.setUsername(database.getUsername());
                hikari.setPassword(passwordEncrypt.decryptPassword(database.getPassword()));

                // MySQL optimizations, see
                // https://github.com/brettwooldridge/HikariCP/wiki/MySQL-Configuration
                hikari.addDataSourceProperty("cachePrepStmts", true);
                hikari.addDataSourceProperty("prepStmtCacheSize", "250");
                hikari.addDataSourceProperty("prepStmtCacheSqlLimit", "2048");
                hikari.addDataSourceProperty("useServerPrepStmts", "true");
                hikari.addDataSourceProperty("useLocalSessionState", "true");
                hikari.addDataSourceProperty("useLocalTransactionState", "true");
                hikari.addDataSourceProperty("rewriteBatchedStatements", "true");
                hikari.addDataSourceProperty("cacheResultSetMetadata", "true");
                hikari.addDataSourceProperty("cacheServerConfiguration", "true");
                hikari.addDataSourceProperty("elideSetAutoCommits", "true");
                hikari.addDataSourceProperty("maintainTimeStats", "false");
                hikari.setMinimumIdle(3);
                hikari.setMaximumPoolSize(5);

                hikari.setIdleTimeout(30000);
                hikari.setPoolName("JPAHikari_" + tenantId);
                // mysql wait_timeout 600seconds
                hikari.setMaxLifetime(580000);
                hikari.setLeakDetectionThreshold(60 * 1000);

                HikariDataSource dataSource = new HikariDataSource(hikari);


                return dataSource;

            } else {
                throw new SQLException(String.format("DB not found for tenant %s!", tenantId));
            }
        } catch (Exception e) {
            throw new SQLException(e.getMessage());
        }
    }

}

@Configuration
@Profile("prod")
public class HibernateConfig {

    @Autowired
    private JpaProperties jpaProperties;

    @Bean
    public JpaVendorAdapter jpaVendorAdapter() {
        return new HibernateJpaVendorAdapter();
    }

    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactory(DataSource dataSource,
            MultiTenantConnectionProvider multiTenantConnectionProviderImpl,
            CurrentTenantIdentifierResolver currentTenantIdentifierResolverImpl) {
        Map<String, Object> properties = new HashMap<>();
        properties.putAll(jpaProperties.getHibernateProperties(new HibernateSettings()));
        properties.put(Environment.MULTI_TENANT, MultiTenancyStrategy.DATABASE);
        properties.put(Environment.MULTI_TENANT_CONNECTION_PROVIDER, multiTenantConnectionProviderImpl);
        properties.put(Environment.MULTI_TENANT_IDENTIFIER_RESOLVER, currentTenantIdentifierResolverImpl);
        LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
        em.setDataSource(dataSource);
        em.setPackagesToScan("com.server");
        em.setJpaVendorAdapter(jpaVendorAdapter());
        em.setJpaPropertyMap(properties);

        return em;
    }

}

spring.datasource.url=jdbc:mysql://url:3306/empty?useLegacyDatetimeCode=false&serverTimezone=UTC&useSSL=false
spring.datasource.username=empty
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.password=empty
  spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL57Dialect
spring.jpa.hibernate.ddl-auto: validate
spring.jpa.hibernate.naming.physical-   strategy=org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl
spring.jpa.show-sql: false