Unable to connect to datastax cassandra - spring-boot

Question

I am tring to connect to datastax cassandra database. And the version of cassandra is 5.0.1. Mine is a springboot application and below is my pom.xml. I am using dse jar connect to the Database. But when I start my application I am getting "All host(s) tried for query failed". Can anyobody help me resolving this issue.
http://maven.apache.org/xsd/maven-4.0.0.xsd">
4.0.0
<groupId>com.sample.myproject</groupId>
<artifactId>sampleproject</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<name>productsFilterRules</name>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.3.3.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-rest</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.4</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-cassandra</artifactId>
<exclusions>
<exclusion>
<groupId>com.datastax.cassandra</groupId>
<artifactId>cassandra-driver-core</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>com.datastax.dse</groupId>
<artifactId>dse-java-driver-core</artifactId>
<version>1.5.1</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.7.5.201505241946</version>
<executions>
<execution>
<id>jacoco-initialize</id>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
</executions>
<configuration>
<rules>
<rule>
<element>CLASS</element>
<excludes>
<exclude>*Test</exclude>
</excludes>
</rule>
</rules>
</configuration>
</plugin>
</plugins>
</build>