SpringBoot多数据源unsatisfied dependency expressed through method 'entityManagerFactoryBuilder...

本来的项目（基于SpringBoot 2.0.5-RELEASE）集成了JPA、mybatis的注解、XML方式访问DB。
后面集成多数据源的时候启动SpringBoot时出现了如下错误：

ERROR 32320 — [main] com.zaxxer.hikari.HikariConfig : HikariPool-1 - jdbcUrl is required with driverClassName.

Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘entityManagerFactory’ defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Unsatisfied dependency expressed through method ‘entityManagerFactory’ parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘entityManagerFactoryBuilder’ defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Unsatisfied dependency expressed through method ‘entityManagerFactoryBuilder’ parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘jpaVendorAdapter’ defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.orm.jpa.JpaVendorAdapter]: Factory method ‘jpaVendorAdapter’ threw exception; nested exception is java.lang.IllegalArgumentException: jdbcUrl is required with driverClassName.
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:732)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:474)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1247)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1096)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:535)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:495)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1089)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:859)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:780)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:412)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:333)
at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:139)
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:99)
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:117)
… 24 more

后来查看了源码，流程如下：

@Bean(name = "test1DataSource")@ConfigurationProperties(prefix = "spring.datasource")@Primarypublic DataSource testDataSource() {return DataSourceBuilder.create().build();}

进入DataSourceBuilder.create().build()：

public T build() {Class<? extends DataSource> type = getType();DataSource result = BeanUtils.instantiateClass(type);maybeGetDriverClassName();bind(result);return (T) result;}

maybeGetDriverClassName(); 方法：

private void maybeGetDriverClassName() {if (!this.properties.containsKey("driverClassName")&& this.properties.containsKey("url")) {String url = this.properties.get("url");String driverClass = DatabaseDriver.fromJdbcUrl(url).getDriverClassName();this.properties.put("driverClassName", driverClass);}}

bind(result) 方法：

private void bind(DataSource result) {ConfigurationPropertySource source = new MapConfigurationPropertySource(this.properties);ConfigurationPropertyNameAliases aliases = new ConfigurationPropertyNameAliases();aliases.addAliases("url", "jdbc-url");aliases.addAliases("username", "user");Binder binder = new Binder(source.withAliases(aliases));binder.bind(ConfigurationPropertyName.EMPTY, Bindable.ofInstance(result));}

因为springboot首推的连接池使用了HikariCP连接池，GET到这个点， HikariDataSource的获取数据库连接的getConnection方法：

@Overridepublic Connection getConnection() throws SQLException{if (isClosed()) {throw new SQLException("HikariDataSource " + this + " has been closed.");}if (fastPathPool != null) {return fastPathPool.getConnection();}// See http://en.wikipedia.org/wiki/Double-checked_locking#Usage_in_JavaHikariPool result = pool;if (result == null) {synchronized (this) {result = pool;if (result == null) {validate();LOGGER.info("{} - Starting...", getPoolName());try {pool = result = new HikariPool(this);this.seal();}catch (PoolInitializationException pie) {if (pie.getCause() instanceof SQLException) {throw (SQLException) pie.getCause();}else {throw pie;}}LOGGER.info("{} - Start completed.", getPoolName());}}}return result.getConnection();}

HikariConfig的validate方法

public void validate(){if (poolName == null) {poolName = generatePoolName();}else if (isRegisterMbeans && poolName.contains(":")) {throw new IllegalArgumentException("poolName cannot contain ':' when used with JMX");}// treat empty property as nullcatalog = getNullIfEmpty(catalog);connectionInitSql = getNullIfEmpty(connectionInitSql);connectionTestQuery = getNullIfEmpty(connectionTestQuery);transactionIsolationName = getNullIfEmpty(transactionIsolationName);dataSourceClassName = getNullIfEmpty(dataSourceClassName);dataSourceJndiName = getNullIfEmpty(dataSourceJndiName);driverClassName = getNullIfEmpty(driverClassName);jdbcUrl = getNullIfEmpty(jdbcUrl);// Check Data Source Optionsif (dataSource != null) {if (dataSourceClassName != null) {LOGGER.warn("{} - using dataSource and ignoring dataSourceClassName.", poolName);}}else if (dataSourceClassName != null) {if (driverClassName != null) {LOGGER.error("{} - cannot use driverClassName and dataSourceClassName together.", poolName);// NOTE: This exception text is referenced by a Spring Boot FailureAnalyzer, it should not be// changed without first notifying the Spring Boot developers.throw new IllegalStateException("cannot use driverClassName and dataSourceClassName together.");}else if (jdbcUrl != null) {LOGGER.warn("{} - using dataSourceClassName and ignoring jdbcUrl.", poolName);}}else if (jdbcUrl != null || dataSourceJndiName != null) {// ok}else if (driverClassName != null) {LOGGER.error("{} - jdbcUrl is required with driverClassName.", poolName);throw new IllegalArgumentException("jdbcUrl is required with driverClassName.");}else {LOGGER.error("{} - dataSource or dataSourceClassName or jdbcUrl is required.", poolName);throw new IllegalArgumentException("dataSource or dataSourceClassName or jdbcUrl is required.");}validateNumerics();if (LOGGER.isDebugEnabled() || unitTest) {logConfiguration();}}

这个if分支：


jdbcUrl = getNullIfEmpty(jdbcUrl);else if (driverClassName != null) {LOGGER.error("{} - jdbcUrl is required with driverClassName.", poolName);throw new IllegalArgumentException("jdbcUrl is required with driverClassName.");}

这里要求DataSource的参数存在 jdbcUrl 、以及driverClassName，而我们的配置是：

spring.datasource.url=jdbc:mysql://localhost:3306/mypydb
spring.datasource.username=root
spring.datasource.password=11111111
spring.datasource.driver-class-name=com.mysql.jdbc.Driverspring.datasource2.url=jdbc:mysql://localhost:3306/mypydb2
spring.datasource2.username=root
spring.datasource2.password=11111111
spring.datasource2.driver-class-name=com.mysql.jdbc.Driver

所以将url改为 jdbc-url 即可。

spring.datasource.jdbc-url=jdbc:mysql://localhost:3306/mypydbspring.datasource2.jdbc-url=jdbc:mysql://localhost:3306/mypydb2

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