I try to put my app in production mode, I'm on vaadin flow 14.1.5, the profile is already on the pom.xml.
production profile on the pom.xml is like this:
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<jvmArguments>-Dvaadin.productionMode</jvmArguments>
</configuration>
</plugin>
<plugin>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-maven-plugin</artifactId>
<version>${vaadin.version}</version>
<executions>
<execution>
<goals>
<goal>prepare-frontend</goal>
<goal>build-frontend</goal>
</goals>
<phase>compile</phase>
</execution>
</executions>
</plugin>
</plugins>
</build>
</profile>
However when running on the terminal: mvn clean package -P production
I got this:
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 6.437 s
[INFO] Finished at: 2020-04-25T00:22:09-04:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal com.vaadin:vaadin-maven-plugin:14.1.5:build-frontend (default) on project project-maya: Execution default of goal com.vaadin:vaadin-maven-plugin:14.1.5:build-frontend failed: Unsupported class file major version 58 -> [Help 1]
I'm on testing at the moment so I don't really care about running on development mode but I will be running on production mode soon and I really don't know what to do to fix this.
Edit: Vaadin 14.1.26 has now been released, which includes the fix for not being able to build with Java 14 (Flow issue #7918).
This is most likely an issue with Java 14.
There's a fix in Flow version 2.1.9 and 2.2.0.beta2.
Vaadin 14.1.25 still uses 2.1.8, hopefully there will be a new version with 2.1.9 soon.
Vaadin 14.2.0.beta1 uses 2.2.0.beta2, so if you want you could try that.
Hopefully the fix is available in a stable release once you need production mode to work.