Issue to connect mySQL using Spring boot and Hibernate -

i follow link (http://blog.netgloo.com/2014/10/27/using-mysql-in-spring-boot-via-spring-data-jpa-and-hibernate/) configure application.properties in intellij.

however, spring.datasource.testwhileidle, spring.datasource.validationquery , spring.jpa.properties.hibernate.dialect cannot resolved [as shown in below image].

my pom.xml shown below:

<?xml version="1.0" encoding="utf-8"?> <project xmlns="http://maven.apache.org/pom/4.0.0" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"     xsi:schemalocation="http://maven.apache.org/pom/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">     <modelversion>4.0.0</modelversion>      <groupid>com.bookstore</groupid>     <artifactid>bookstore</artifactid>     <version>0.0.1-snapshot</version>     <packaging>jar</packaging>      <name>bookstore</name>     <description>frontend of bookstore project</description>      <parent>         <groupid>org.springframework.boot</groupid>         <artifactid>spring-boot-starter-parent</artifactid>         <version>1.5.2.release</version>         <relativepath/> <!-- lookup parent repository -->     </parent>      <properties>         <project.build.sourceencoding>utf-8</project.build.sourceencoding>         <project.reporting.outputencoding>utf-8</project.reporting.outputencoding>         <java.version>1.8</java.version>     </properties>      <dependencies>         <dependency>             <groupid>org.springframework.boot</groupid>             <artifactid>spring-boot-starter-thymeleaf</artifactid>         </dependency>          <dependency>             <groupid>org.springframework.boot</groupid>             <artifactid>spring-boot-starter-web</artifactid>         </dependency>          <dependency>             <groupid>org.springframework.boot</groupid>             <artifactid>spring-boot-starter-test</artifactid>             <scope>test</scope>         </dependency>          <dependency>             <groupid>org.springframework.boot</groupid>             <artifactid>spring-boot-devtools</artifactid>             <optional>true</optional>         </dependency>          <dependency>             <groupid>org.springframework.boot</groupid>             <artifactid>spring-boot-starter-jdbc</artifactid>         </dependency>          <dependency>             <groupid>org.springframework.boot</groupid>             <artifactid>spring-boot-starter-data-jpa</artifactid>         </dependency>          <dependency>             <groupid>mysql</groupid>             <artifactid>mysql-connector-java</artifactid>         </dependency>     </dependencies>      <build>         <plugins>             <plugin>                 <groupid>org.springframework.boot</groupid>                 <artifactid>spring-boot-maven-plugin</artifactid>                 <configuration>                     <fork>true</fork>                 </configuration>             </plugin>         </plugins>     </build> </project> 

could me figure out reason?