Quarkus and EclipseStore (and records)

[Stwissel]

Sample needed

I'm looking for a very basic example how to use EclipseStore with Quarkus. My own attempts turned out futile, I only learned new Exception classes:

• PersistenceException: Missing runtime type for required type handler for type: com.notessensei.TrainDepot
• StorageExceptionInitialization: Active storage for org.eclipse.store.storage.types.Database$Default@283a11af "Eclipse Serializer@target/trains" already exists.

What I tried

• use @ApplicationScoped and @Inject
• create an enum Singleton ( public enum Factory() { INSTANCE; /* ... */ })
• various flavours of static accessors

I must be missing something substantial

Advice is very much appreciated!

Reproducer: https://github.com/Stwissel/quarkus-eclipsestore

[hg-ms]

Hi,
Did you try to disable the Quarkus dev mode? As it does hot code replacement it will cause problems if classes already persisted are replaced.

Regarding the StorageExceptionInitialization:
You must ensure that there is only one Eclipse-store instance active. As far as I remember there is also the “@singleton” option instead of “@ApplicationScoped”. The Application scope is allowed to recreate beans at runtime.
There is also a CDI integration, but I don’t know if it works with Quarkus.

I also identified issue in “‎TrainStorage::store”:
When adding a new object to a collection you need to store the modified collection. Not the new object. When storing the collection, the newly added object will be detected as not jet persisted and stored automatically. Please see Storing Data.

[Stwissel]

Some findings:

• quarkus dev seems to be incompatible to EclipseStore. Running quarkus run was one step to get it to work
• In TrainDepot I had to change Map<String,Train> trains to List<Train> trains and call storageManager.store(depot.trains) to persist.
• Loading also needed to initialize without the root object and then check for null

public class TrainStorage {
  private final EmbeddedStorageManager storageManager;
  public final TrainDepot depot;

  public TrainStorage() {

    this.storageManager = EmbeddedStorage.start(Path.of("traindepot"));
    System.out.println("Storage initialized");

    if (this.storageManager.root() != null) {
      this.depot = (TrainDepot) this.storageManager.root();
      System.out.println("Loaded existing storage");
      System.out.println("Current trains: " + this.depot.trains.size());
    } else {
      System.out.println("No existing storage found, starting fresh");
      this.depot = new TrainDepot();
      this.storageManager.setRoot(this.depot);
      this.storageManager.storeRoot();
    }
  }
...
}

• last not least I could not get Quarkus to honour JAVA_OPTS="--add-exports java.base/jdk.internal.misc=ALL-UNNAMED" or -Dquarkus.jvm.args="--add-exports java.base/jdk.internal.misc=ALL-UNNAMED", so I couldn't get records to work