ValidationException with Spring boot and Jetty - spring-boot

Question

I set up a spring boot application(1.4.0.RELEASE) with the following configuration
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
As expected, this ran with embedded Tomcat. I then thought of trying the same with a Jetty server and followed the steps mentioned in the documentation here:
Using Jetty instead of Tomcat
Basically excluding Tomcat and adding dependency for Jetty.Running mvn clean install from the command line or running the main method resulted in the following exception:
Caused by: javax.validation.ValidationException: HV000183: Unable to
load 'javax.el.ExpressionFactory'. Check that you have the EL
dependencies on the classpath, or use ParameterMessageInterpolator
instead
I could solve this by adding the following dependency in the pom.xml:
<dependency>
<groupId>javax.el</groupId>
<artifactId>javax.el-api</artifactId>
<version>3.0.0</version>
</dependency>
I am not directly using any validation related code but I suspect this is getting pulled from the spring boot jpa starter which pulls in Hibernate. I have also seen a discussion around this here: Similar issue
Questions:
1) Is this the right fix?
2) If it is the right fix, should the documentation be updated to add this dependency as well?

Answer 1

You are correct in using the javax.el dependency. When the JPA pulls in Hibernate as you stated, it will use the Hibernate Validator. It's specified here. This is the right fix. As for the documentation, I personally would raise it but I suspect not everyone will have the same issue. I still can run my mvn clean install without errors however if I run mvn spring-boot:run it starts up and shuts-down straight after.