Reflection-Fast-Jar-Example project

This project uses Quarkus, the Supersonic Subatomic Java Framework.

Structure of the Project

• We have a enum ServiceConfiguration that implements the Interface Configurable.
• We have 2 Entities Entity1 and Entity2 that extend BaseUUIDEntity.

The aim is to lookup all Instances of Configurable and BaseUUIDEntity.

In the Class ServiceStartup several lookups are performed.

1. Try to get all Configurables via org.reflection.Reflection and Class
2. Try to get all Configurables via org.reflection.Reflection and Packagename io.example
3. Try to get all Configurables via javax.enterprise.inject.Instance
4. Try to get all BaseUUIDEntities via org.reflection.Reflection and Class
5. Try to get all BaseUUIDEntities via org.reflection.Reflection and Packagename io.example
6. Try to get all BaseUUIDEntities via javax.enterprise.inject.Instance

We get a different behaviour when the Jar is packaged in legay-jar Mode or fast-jar Mode.

More details see below:

Legacy Jar

Package the Project as a Legacy Jar

mvn clean package -Dquarkus.package.type=legacy-jar

Execute the jar

java -jar target/Reflection-Fast-Jar-Example-1.0.0-SNAPSHOT-runner.jar

Output:

 --/ __ \/ / / / _ | / _ \/ //_/ / / / __/
 -/ /_/ / /_/ / __ |/ , _/ ,< / /_/ /\ \
--\___\_\____/_/ |_/_/|_/_/|_|\____/___/
2021-02-26 11:39:48,392 INFO  [io.qua.sch.run.SimpleScheduler] (main) No scheduled business methods found - Simple scheduler will not be started
Application is starting!!
--Start-GetConfigurables via Class--
2021-02-26 11:39:48,423 INFO  [org.ref.Reflections] (main) Reflections took 22 ms to scan 1 urls, producing 5 keys and 3 values
Configurable:Name.SERVICECONFIG1
Configurable:Name.SERVICECONFIG2
Configurable:Name.SERVICECONFIG3
--Finish-GetConfigurables via Class--
--Start-GetConfigurables via Package--
2021-02-26 11:39:48,439 INFO  [org.ref.Reflections] (main) Reflections took 10 ms to scan 1 urls, producing 27 keys and 21 values
Configurable:Name.SERVICECONFIG1
Configurable:Name.SERVICECONFIG2
Configurable:Name.SERVICECONFIG3
--Finish-GetConfigurables via Package--
--Start-GetConfigurables via Instances--
--Finish-GetConfigurables via Instances--
--Start-GetEntities via Class--
2021-02-26 11:39:48,443 INFO  [org.ref.Reflections] (main) Reflections took 2 ms to scan 1 urls, producing 8 keys and 6 values
Entity:class io.example.entity.base.BaseUUIDEntity$HibernateProxy$1yJUWXYo
--Finish-GetEntities via Class--
--Start-GetEntities via Package--
2021-02-26 11:39:48,452 INFO  [org.ref.Reflections] (main) Reflections took 5 ms to scan 1 urls, producing 27 keys and 21 values
Entity:class io.example.entity.Entity1$HibernateProxy$EzJ8tJgJ
Entity:class io.example.entity.Entity2
Entity:class io.example.entity.Entity1
Entity:class io.example.entity.base.BaseUUIDEntity$HibernateProxy$1yJUWXYo
Entity:class io.example.entity.Entity2$HibernateProxy$6JARE3KH
--Finish-GetEntities via Package--
--Start-GetEntities via Instances--
Entity:Entity2
Entity:Entity1
--Finish-GetEntities via Instances--
2021-02-26 11:39:48,543 INFO  [io.quarkus] (main) Reflection-Fast-Jar-Example 1.0.0-SNAPSHOT on JVM (powered by Quarkus 1.12.0.Final) started in 2.056s. Listening on: http://0.0.0.0:8080
2021-02-26 11:39:48,544 INFO  [io.quarkus] (main) Profile prod activated.
2021-02-26 11:39:48,545 INFO  [io.quarkus] (main) Installed features: [agroal, cdi, hibernate-envers, hibernate-orm, jdbc-postgresql, mutiny, narayana-jta, scheduler, smallrye-context-propagation, smallrye-openapi]

Conclussion

• Configurables can be loaded:
  • via Reflection Class
  • via Reflection Package
  • via Instance
• BaseUUIDEntities can be loaded:
  • via Reflection Class
  • via Reflection Package
  • via Instance

Fast Jar

Package the Project as a Legacy Jar

mvn clean package

Execute the jar

java -jar target/quarkus-app/quarkus-run.jar

Output:

 --/ __ \/ / / / _ | / _ \/ //_/ / / / __/
 -/ /_/ / /_/ / __ |/ , _/ ,< / /_/ /\ \
--\___\_\____/_/ |_/_/|_/_/|_|\____/___/
2021-02-26 12:03:11,510 INFO  [io.qua.sch.run.SimpleScheduler] (main) No scheduled business methods found - Simple scheduler will not be started
Application is starting!!
--Start-GetConfigurables via Class--
2021-02-26 12:03:11,532 INFO  [org.ref.Reflections] (main) Reflections took 15 ms to scan 1 urls, producing 5 keys and 3 values
Configurable:Name.SERVICECONFIG1
Configurable:Name.SERVICECONFIG2
Configurable:Name.SERVICECONFIG3
--Finish-GetConfigurables via Class--
--Start-GetConfigurables via Package--
2021-02-26 12:03:11,536 WARN  [org.ref.Reflections] (main) given scan urls are empty. set urls in the configuration
ServiceStartup.getConfigurables() - No Configurables defined !!!Scanner SubTypesScanner was not configured
--Finish-GetConfigurables via Package--
--Start-GetConfigurables via Instances--
--Finish-GetConfigurables via Instances--
--Start-GetEntities via Class--
2021-02-26 12:03:11,538 INFO  [org.ref.Reflections] (main) Reflections took 1 ms to scan 1 urls, producing 5 keys and 4 values
--Finish-GetEntities via Class--
--Start-GetEntities via Package--
2021-02-26 12:03:11,539 WARN  [org.ref.Reflections] (main) given scan urls are empty. set urls in the configuration
ServiceStartup.getEntities viaPackage:trueException:Scanner SubTypesScanner was not configured
--Finish-GetEntities via Package--
--Start-GetEntities via Instances--
Entity:Entity2
Entity:Entity1
--Finish-GetEntities via Instances--
2021-02-26 12:03:11,615 INFO  [io.quarkus] (main) Reflection-Fast-Jar-Example 1.0.0-SNAPSHOT on JVM (powered by Quarkus 1.12.0.Final) started in 1.647s. Listening on: http://0.0.0.0:8080
2021-02-26 12:03:11,616 INFO  [io.quarkus] (main) Profile prod activated.
2021-02-26 12:03:11,616 INFO  [io.quarkus] (main) Installed features: [agroal, cdi, hibernate-envers, hibernate-orm, jdbc-postgresql, mutiny, narayana-jta, scheduler, smallrye-context-propagation, smallrye-openapi]

Conclussion

• Configurables can be loaded:
  • via Reflection Class
  • via Reflection Package
  • via Instance
• BaseUUIDEntities can be loaded:
  • via Reflection Class
  • via Reflection Package
  • via Instance

Questions

• Why are Configurables not able to be loaded via Instance??
• Why is in FastJar the load of Configurables with Packagename not possible? given scan urls are empty. set urls in the configuration
• In Fast-Jar Mode the BaseUUIDEntities are not loadbale via Packagename. Why??