spring boot druid 多數據源異常

 Reason: Property 'url' threw exception; nested exception is java.lang.UnsupportedOperationException

原來的代碼：

    @Primary
    @Bean(name = "dataSource")
    @ConfigurationProperties(prefix = "spring.datasource")    
    public DataSource druidDataSource() {
        DruidDataSource datasource = new DruidDataSource();
        datasource.setUrl(url);
        datasource.setUsername(username);
        datasource.setPassword(password);
        datasource.setDriverClassName(driverClassName);
        datasource.setInitialSize(initialSize);
        datasource.setMinIdle(minIdle);
        datasource.setMaxActive(maxActive);
        datasource.setMaxWait(maxWait);
        datasource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);
        datasource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);
        datasource.setValidationQuery(validationQuery);
        datasource.setTestWhileIdle(testWhileIdle);
        datasource.setTestOnBorrow(testOnBorrow);
        datasource.setTestOnReturn(testOnReturn);
        datasource.setConnectionProperties(connectionProperties);
        datasource.setDbType(type);
        
        try {
            datasource.setPasswordCallbackClassName(passwordCallbackClassName);
            datasource.setFilters(filters);
        } catch (Exception e) {
            logger.error("druid configuration initialization filter", e);
        }
        return datasource;
    }

解決辦法：去掉@ConfigurationProperties(prefix = "spring.datasource") ，不要兩次賦值  

  正確代碼 

  @Primary
    @Bean(name = "dataSource")
    public DataSource druidDataSource() {
        DruidDataSource datasource = new DruidDataSource();
        datasource.setUrl(url);
        datasource.setUsername(username);
        datasource.setPassword(password);
        datasource.setDriverClassName(driverClassName);
        datasource.setInitialSize(initialSize);
        datasource.setMinIdle(minIdle);
        datasource.setMaxActive(maxActive);
        datasource.setMaxWait(maxWait);
        datasource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);
        datasource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);
        datasource.setValidationQuery(validationQuery);
        datasource.setTestWhileIdle(testWhileIdle);
        datasource.setTestOnBorrow(testOnBorrow);
        datasource.setTestOnReturn(testOnReturn);
        datasource.setConnectionProperties(connectionProperties);
        datasource.setDbType(type);
        
        try {
            datasource.setPasswordCallbackClassName(passwordCallbackClassName);
            datasource.setFilters(filters);
        } catch (Exception e) {
            logger.error("druid configuration initialization filter", e);
        }
        return datasource;
    }

 

解決方法：

16:58:11.012 schedule [main] WARN  o.s.b.c.e.AnnotationConfigEmbeddedWebApplicationContext - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource': Could not bind properties to DruidDataSource (prefix=spring.datasource, ignoreInvalidFields=true, ignoreUnknownFields=true, ignoreNestedProperties=true); nested exception is org.springframework.validation.BindException: org.springframework.boot.bind.RelaxedDataBinder$RelaxedBeanPropertyBindingResult: 3 errors

由此日誌發現是引發三個錯誤的緣由，而後試着去找prefix=spring.datasource，ignoreNestedProperties等在哪裏定義的，而後發現druidDataSource方法有spring.datasource前綴，試着修改了一下ignoreNestedProperties，再去看日誌，果真發現是這裏的問題