Spring Boot建立DataSource時遇到的錯誤：No supported DataSource type found

在對Spring Boot進行DataSource配置的時候遇到一個錯誤

Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [javax.sql.DataSource]: Factory method 'testDataSource' threw exception; nested exception is java.lang.IllegalStateException: No supported DataSource type found
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.0.8.RELEASE.jar:5.0.8.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:582) ~[spring-beans-5.0.8.RELEASE.jar:5.0.8.RELEASE]
    ... 93 common frames omitted
Caused by: java.lang.IllegalStateException: No supported DataSource type found
    at org.springframework.boot.jdbc.DataSourceBuilder.getType(DataSourceBuilder.java:146) ~[spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]
    at org.springframework.boot.jdbc.DataSourceBuilder.build(DataSourceBuilder.java:74) ~[spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]
    at com.kai.demo.DataSourceConfig.testDataSource(DataSourceConfig.java:37) ~[classes/:na]
    at com.kai.demo.DataSourceConfig$$EnhancerBySpringCGLIB$$e66334f9.CGLIB$testDataSource$3(<generated>) ~[classes/:na]
    at com.kai.demo.DataSourceConfig$$EnhancerBySpringCGLIB$$e66334f9$$FastClassBySpringCGLIB$$99581351.invoke(<generated>) ~[classes/:na]
    at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) ~[spring-core-5.0.8.RELEASE.jar:5.0.8.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:361) ~[spring-context-5.0.8.RELEASE.jar:5.0.8.RELEASE]
    at com.kai.demo.DataSourceConfig$$EnhancerBySpringCGLIB$$e66334f9.testDataSource(<generated>) ~[classes/:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_121]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_121]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_121]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_121]
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.0.8.RELEASE.jar:5.0.8.RELEASE]
    ... 94 common frames omitted

原因是在使用DataSourceBuilder時需要在classpath裡指定以下三個中的任意一個：

1.       COMMONS-DBCP

2.       TOMCAT-JDBC

3.       HIKARICP

於是在pom.xml新增了HiKariCP的依賴

		<dependency>
			<groupId>com.zaxxer</groupId>
			<artifactId>HikariCP</artifactId>
			<version>3.2.0</version>
		</dependency>

錯誤就沒有了

參考地址： https://stackoverflow.com/questions/44635962/error-when-create-datasource

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