Running Spring boot application inside docker container

I have created an image out of my simple spring-boot application and set the port to 7000 for the tomcat , when I run the image and try to hit the service in my local I am not getting any response.

here are the contents of the dockerfile

FROM java:8VOLUME /tmpADD  /target/demo-1.0-SNAPSHOT.jar /app.jarENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]

Am I missing something here ( I am new to docker and I just used the file in spring boot sample docker and created the image and stuck here.)