[I] [4.22.1] Container fails to start: application compiled for Java 25 but image uses Java 21 [camel-karavan]

["wnehdi (via GitHub)" <gi...@apache.org>]

wnehdi opened a new issue, #1653:
URL: https://github.com/apache/camel-karavan/issues/1653

   ### Describe the bug
   
   Hello,
   
   Apache Camel Karavan 4.22.1 fails to start on Kubernetes with an `UnsupportedClassVersionError`.
   
   **Environment**
   - Karavan: 4.22.1
   - Deployment: Kubernetes, managed through Rancher
   - Image: `ghcr.io/apache/camel-karavan:4.22.1`, pulled through a Harbor proxy cache
   
   **Steps to reproduce**
   1. Deploy the Karavan 4.22.1 image with the required configuration.
   2. Start the container.
   3. Check the application logs.
   
   **Actual behavior**
   
   The application fails during startup:
   
   ```text
   java.lang.UnsupportedClassVersionError:
   org/apache/camel/karavan/service/NotificationService
   has been compiled by a more recent version of the Java Runtime
   (class file version 69.0), this version of the Java Runtime
   only recognizes class file versions up to 65.0
   ```
   
   **Expected behavior**
   
   The published container image should include a Java runtime compatible with the packaged application.
   
   **Identified mismatch**
   
   In the `4.22.1` source tag:
   
   `karavan-app/pom.xml`:
   ```xml
   <maven.compiler.source>25</maven.compiler.source>
   <maven.compiler.release>25</maven.compiler.release>
   ```
   
   `karavan-app/src/main/docker/Dockerfile`:
   ```dockerfile
   FROM eclipse-temurin:21-jdk
   ```
   
   Class file version **69** corresponds to Java **25**, while version **65** corresponds to Java **21**.
   
   **Tested workaround**
   
   I used an init container to copy `/opt/app/karavan.jar` from the Karavan image into a shared volume, then executed the same JAR in a container based on `eclipse-temurin:25-jdk`.
   
   The application started successfully with this workaround.
   
   **Suggested fix**
   
   Align the container runtime with the application's compilation target, for example by updating the Dockerfile base image to:
   
   ```dockerfile
   FROM eclipse-temurin:25-jdk
   ```
   
   Please also consider adding a startup smoke test for the built image to detect this mismatch before publication.
   
   Thank you.
   
   ### Steps to reproduce the behavior
   
   
   ...
   
   ### Variant
   
   Web Application
   
   ### Container Management (if applicable)
   
   Kubernetes
   
   ### Operating System (if applicable)
   
   Linux
   
   ### Version
   
   4.22.1
   
   ### Relevant log output
   
   ```shell
   
   ```


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Re: [I] [4.22.1] Container fails to start: application compiled for Java 25 but image uses Java 21 [camel-karavan]

["mgubaidullin (via GitHub)" <gi...@apache.org>]

mgubaidullin commented on issue #1653:
URL: https://github.com/apache/camel-karavan/issues/1653#issuecomment-6125840475

   @wnehdi appreciate your hel!


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Re: [I] [4.22.1] Container fails to start: application compiled for Java 25 but image uses Java 21 [camel-karavan]

["mgubaidullin (via GitHub)" <gi...@apache.org>]

mgubaidullin closed issue #1653: [4.22.1] Container fails to start: application compiled for Java 25 but image uses Java 21
URL: https://github.com/apache/camel-karavan/issues/1653


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