Vaadin 14 production build failure Unsupported class file major version 62

Flow
1

Hi! We are currently developing an application with Vaadin 14. Everything is up and running in dev mode but when building for production the following exception appears:

[ERROR] Failed to execute goal com.vaadin:vaadin-maven-plugin:14.2.0:build-frontend (default) on project ######: Execution default of goal com.vaadin:vaadin-maven-plugin:14.2.0:build-frontend failed: Unsupported class file major version 62 → [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal com.vaadin:vaadin-maven-plugin:14.2.0:build-frontend (default) on project mgov4eu-dataexchange: Execution default of goal com.vaadin:vaadin-maven-plugin:14.2.0:build-frontend failed: Unsupported class file major version 62

Any hints on how to fix this?
Thanks :slightly_smiling_face:

2

You are using different Java versions

3

how do you mean?

4

The java version you are using to build the production artefacts does not support the java code you have written / configured on your pom (compiler and source target properties)

5

thanks for the hint, we ll keep trying to figure it out :slightly_smiling_face: