Intellij IDEA UnsupportedClassVersionError

Question

I am trying to deploy a Hibernate test project on an Application Server (tried Glassfish 5.0.1 & Tomcat 9.0.64) but I get the following error:

java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.UnsupportedClassVersionError: jakarta/ws/rs/core/FeatureContext has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0 (unable to load class [jakarta.ws.rs.core.FeatureContext])

I have to mention that I created this project using IntelliJ IDEA, because yesterday I was working on another project, which I created using the command described in Jersey Documentation,

mvn archetype:generate -DarchetypeArtifactId=jersey-quickstart-webapp -DarchetypeGroupId=org.glassfish.jersey.archetypes -DinteractiveMode=false -DgroupId=com.example -DartifactId=simple-service-webapp -Dpackage=com.example -DarchetypeVersion=2.36

and it worked on both servers. My JRE and JDK are on same version (Java 8) and I would like to avoid changing it.

I had the same problem yesterday, when I tried to create a Project using IntelliJ IDEA. Any IDEA what could have caused this?

Answer 1

The problem was that one of the dependencies' version was not compatible with my JRE version.

I specified the version attribute for jersey-container-servlet-core in pom.xml file to be 2.36 which is compatible with JRE 1.8, and then built the project again.

<dependency>
    <groupId>org.glassfish.jersey.containers</groupId>
    <artifactId>jersey-container-servlet-core</artifactId>
    <version>2.36</version>
</dependency>

So if you get this error, you probably have to check your dependencies compatibility with your current JRE version.