Question

我一直试图将我的JHipster生成的应用程序转换为多租户应用程序，使用此http://jannatconsulting.com/blog/?p=41博客文章作为基础。

我遇到了二级缓存的问题。 Spring启动似乎可以正确检测和设置：

DatabaseConfiguration.java

@Configuration
@EnableConfigurationProperties(JpaProperties.class)
@EnableJpaRepositories(
        entityManagerFactoryRef = "masterEntityManager",
        transactionManagerRef = "masterTransactionManager",
        basePackages = {"com.quadrimular.nts.helium.repository.master"})
@EnableJpaAuditing(auditorAwareRef = "springSecurityAuditorAware")
@EnableTransactionManagement
@EnableElasticsearchRepositories("com.quadrimular.nts.helium.repository.search")
public class DatabaseConfiguration {

    @Inject
    private Environment env;

    @Autowired(required = false)
    private MetricRegistry metricRegistry;

    @Inject
    private DataSourceProperties datasourceProperties;

    @Inject
    private JHipsterProperties jhipsterProperties;

    @Inject
    private JpaProperties jpaProperties;

    @Inject
    private DataSource dataSource;

    @Bean(destroyMethod = "close")
    @ConditionalOnExpression("#{!environment.acceptsProfiles('cloud') && !environment.acceptsProfiles('heroku')}")
    public DataSource dataSource(DataSourceProperties dataSourceProperties, JHipsterProperties jHipsterProperties) {
        log.debug("Configuring Master Datasource");
        if (dataSourceProperties.getUrl() == null) {
            log.error("Your database connection pool configuration is incorrect! The application" +
                    " cannot start. Please check your Spring profile, current profiles are: {}",
                Arrays.toString(env.getActiveProfiles()));

            throw new ApplicationContextException("Database connection pool is not configured correctly");
        }
        HikariConfig config = new HikariConfig();
        config.setDataSourceClassName(dataSourceProperties.getDriverClassName());
        config.addDataSourceProperty("url", dataSourceProperties.getUrl());
        if (dataSourceProperties.getUsername() != null) {
            config.addDataSourceProperty("user", dataSourceProperties.getUsername());
        } else {
            config.addDataSourceProperty("user", ""); // HikariCP doesn't allow null user
        }
        if (dataSourceProperties.getPassword() != null) {
            config.addDataSourceProperty("password", dataSourceProperties.getPassword());
        } else {
            config.addDataSourceProperty("password", ""); // HikariCP doesn't allow null password
        }

        //MySQL optimizations, see https://github.com/brettwooldridge/HikariCP/wiki/MySQL-Configuration
        if ("com.mysql.jdbc.jdbc2.optional.MysqlDataSource".equals(dataSourceProperties.getDriverClassName())) {
            config.addDataSourceProperty("cachePrepStmts", jHipsterProperties.getDatasource().isCachePrepStmts());
            config.addDataSourceProperty("prepStmtCacheSize", jHipsterProperties.getDatasource().getPrepStmtCacheSize());
            config.addDataSourceProperty("prepStmtCacheSqlLimit", jHipsterProperties.getDatasource().getPrepStmtCacheSqlLimit());
        }
        if (metricRegistry != null) {
            config.setMetricRegistry(metricRegistry);
        }
        return new HikariDataSource(config);
    }

    @Bean(name = "masterEntityManager")
    public LocalContainerEntityManagerFactoryBean entityManagerFactory(){
        JpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
        LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
        em.setDataSource(dataSource(datasourceProperties, jhipsterProperties));
        em.setPackagesToScan(new String[]{"com.quadrimular.nts.helium.domain.master"});
        em.setJpaVendorAdapter(vendorAdapter);
        em.setJpaProperties(additionalJpaProperties());

        em.setPersistenceUnitName("master");

        return em;
    }

    private Properties additionalJpaProperties() {
        Properties properties = new Properties();
        for (Map.Entry<String, String> entry : jpaProperties.getHibernateProperties(dataSource).entrySet()) {
            properties.setProperty(entry.getKey(), entry.getValue());
        }
        return properties;
    }
    @Bean(name = "masterTransactionManager")
    public JpaTransactionManager transactionManager(EntityManagerFactory masterEntityManager){
        JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(masterEntityManager);
        return transactionManager;
    }
}

当spring尝试配置时：

MultiTenancyJPAConfiguration.java

@Configuration
@EnableConfigurationProperties(JpaProperties.class)
@EnableJpaRepositories(
        entityManagerFactoryRef = "tenantEntityManager",
        transactionManagerRef = "tenantTransactionManager",
        basePackages = {"com.quadrimular.nts.helium.repository.tenant"})
@EnableTransactionManagement
public class MultiTenancyJpaConfiguration {

    @Bean(name = "tenantEntityManager")
    public LocalContainerEntityManagerFactoryBean entityManagerFactory(DataSource dataSource,
                                                           MultiTenantConnectionProvider connectionProvider,
                                                           CurrentTenantIdentifierResolver tenantResolver) {
        LocalContainerEntityManagerFactoryBean emfBean = new LocalContainerEntityManagerFactoryBean();
        emfBean.setDataSource(dataSource);
        emfBean.setPackagesToScan("com.quadrimular.nts.helium.domain.tenant");
        emfBean.setJpaVendorAdapter(jpaVendorAdapter());

        Map<String, Object> properties = new HashMap<>();
        properties.put(org.hibernate.cfg.Environment.MULTI_TENANT, MultiTenancyStrategy.DATABASE);
        properties.put(org.hibernate.cfg.Environment.MULTI_TENANT_CONNECTION_PROVIDER, connectionProvider);
        properties.put(org.hibernate.cfg.Environment.MULTI_TENANT_IDENTIFIER_RESOLVER, tenantResolver);
        properties.put("hibernate.ejb.naming_strategy", "org.hibernate.cfg.ImprovedNamingStrategy");

        emfBean.setJpaPropertyMap(properties);

        return emfBean;
    }

    @Bean(name = "tenantTransactionManager")
    public JpaTransactionManager transactionManager(EntityManagerFactory tenantEntityManager){
        JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(tenantEntityManager);
        return transactionManager;
    }
}

我正在追踪这个：

Caused by: org.hibernate.cache.NoCacheRegionFactoryAvailableException: Second-level cache is used in the application, but property hibernate.cache.region.factory_class is not given; please either disable second level cache or set correct region factory using the hibernate.cache.region.factory_class setting and make sure the second level cache provider (hibernate-infinispan, e.g.) is available on the classpath.

我在application-dev.yml

中定义了所有必需的属性

hibernate.cache.use_second_level_cache: true
hibernate.cache.use_query_cache: false
hibernate.generate_statistics: true
hibernate.cache.region.factory_class: org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory

对于我的DatabaseConfiguration.java，它似乎正在被Spring引导正确读取和使用。我无法弄清楚为什么它没有检测到属性文件。如果我尝试通过设置禁用缓存：

hibernate.cache.use_second_level_cache: false

DatabaseConfiguration.java会相应地检测并运行，但MultiTenancyJPAConfiguration.java仍然会抛出相同的异常。

我错过了一些明显的东西吗？

Answer 1

答案是在实体管理器上实际设置jpa属性值。我不确定我是如何忽视这一点的;我以为他们已经设定了。

首先我注入了主数据源和spring boot提供的jpa属性对象，如果我没弄错的话。

<强> MultiTenancyJPAConfiguration.java

@Inject
private JpaProperties jpaProperties;

@Inject
private DataSource dataSource;

然后我使用 DatabaseConfiguration.java

中使用的相同方法设置值

<强> MultiTenancyJPAConfiguration.java

    @Bean(name = "tenantEntityManager")
    public LocalContainerEntityManagerFactoryBean entityManagerFactory(DataSource dataSource,
                                                           MultiTenantConnectionProvider connectionProvider,
                                                           CurrentTenantIdentifierResolver tenantResolver) {
        LocalContainerEntityManagerFactoryBean emfBean = new LocalContainerEntityManagerFactoryBean();
        emfBean.setDataSource(dataSource);
        emfBean.setPackagesToScan("com.quadrimular.nts.helium.domain.tenant");
        emfBean.setJpaVendorAdapter(jpaVendorAdapter());

        Map<String, Object> properties = new HashMap<>();
        properties.put(org.hibernate.cfg.Environment.MULTI_TENANT, MultiTenancyStrategy.DATABASE);
        properties.put(org.hibernate.cfg.Environment.MULTI_TENANT_CONNECTION_PROVIDER, connectionProvider);
        properties.put(org.hibernate.cfg.Environment.MULTI_TENANT_IDENTIFIER_RESOLVER, tenantResolver);
        properties.put("hibernate.ejb.naming_strategy", "org.hibernate.cfg.ImprovedNamingStrategy");

        emfBean.setJpaPropertyMap(properties);

        emfBean.setJpaProperties(additionalJpaProperties());

        return emfBean;
    }

    private Properties additionalJpaProperties() {
        Properties properties = new Properties();
        for (Map.Entry<String, String> entry : jpaProperties.getHibernateProperties(dataSource).entrySet()) {
            properties.setProperty(entry.getKey(), entry.getValue());
        }
        return properties;
    }

使用additionalJpaProperties（）方法获取主数据源的所有hibernate jpa属性。然后我在硬编码后设置hibernate属性映射属性。显然，这不是我打算从.yml文件中设置所有jpa值的最干净的解决方案。

具有Hibernate二级缓存的Jhipster多租户

1 个答案: