我正在为我的应用程序使用"Spring-boot + Hibernate4 + mysql".作为其中的一部分,我有一个要求,即使数据库关闭,我的sprint-boot应用程序应该能够启动.目前,当我尝试在没有DB启动的情况下启动Spring启动应用程序时,它会给出以下异常.
我研究了很多,发现这个例外与hibernate.temp.use_jdbc_metadata_defaults财产有关.
我尝试在spring boot的"application.yml"中设置它,但是这个属性的值没有在运行时反映出来.
异常堆栈跟踪:
2014-05-25 04:09:43.193 INFO 59755 --- [ main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {4.0.4.Final}
2014-05-25 04:09:43.250 WARN 59755 --- [ main] o.h.e.jdbc.internal.JdbcServicesImpl : HHH000342: Could not obtain connection to query metadata : Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
2014-05-25 04:09:43.263 INFO 59755 --- [ main] o.apache.catalina.core.StandardService : Stopping service Tomcat …我有一个类,我想在组件扫描时排除.我使用下面的代码来做到这一点,但似乎没有工作,虽然一切似乎都是正确的
@ComponentScan(basePackages = { "common", "adapter", "admin"}, excludeFilters = { @ComponentScan.Filter(type = FilterType.ASSIGNABLE_TYPE, value = ServiceImpl.class) })
实际上我想要有"ServiceImpl"类,它实现了"服务"接口,正在我的其余api逻辑中使用,在进行api的集成测试时,我想要排除这个实现并加载模拟的实现.但这似乎并没有发生,因为即使使用上面我得到以下错误
No qualifying bean of type [admin.Service] is defined: expected single matching bean but found 2: ServiceMockImpl,ServiceImpl
我花了太多时间在这上面但没有任何作用.
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我正在尝试创建一个"Spring-Boot"项目,其中我有一个要求,我想要连接到不同的数据库"MySql"和"MongoDB".
我是否需要做一些特殊的事情才能连接到两个数据库,或者spring-boot会自动计算连接到两个数据库本身.我是否还需要为"mongodb"定义数据源？
MySQL特定的"YML"文件如下所示
# Default DB parameter definitions for the URL parameters in the spring.datasource.url property below
database:
host: localhost
port: 3306
schema: subscriptions
username: root
password: root
autoconnect:
maxReconnects: 3
initialTimeout: 2
timeout:
connectTimeout: 0
socketTimeout: 0
failover:
host: localhost
port: 3306
queriesBeforeRetryMaster: 50
secondsBeforeRetryMaster: 30
properties: useTimezone=true&serverTimezone=UTC&useLegacyDatetimeCode=false&failOverReadOnly=false&autoReconnect=true&maxReconnects=${database.autoconnect.maxReconnects}&initialTimeout=${database.autoconnect.initialTimeout}&connectTimeout=${database.timeout.connectTimeout}&socketTimeout=${database.timeout.socketTimeout}&queriesBeforeRetryMaster=${database.failover.queriesBeforeRetryMaster}&secondsBeforeRetryMaster=${database.failover.secondsBeforeRetryMaster}
spring:
datasource:
driverClassName: com.mysql.jdbc.Driver
url: jdbc:mysql://${database.host}:${database.port},${database.failover.host}:${database.failover.port}/${database.schema}?${database.properties}
username: ${database.username}
password: ${database.password}
continueOnError: true
initialize: false
initialSize: 0
timeBetweenEvictionRunsMillis: 5000
minEvictableIdleTimeMillis: 5000
removeAbandonedTimeout: 60
removeAbandoned: true
minIdle: 0
jpa:
show-sql: true
hibernate:
ddl-auto: …