Migration Guide 2.1

Hibernate with Panache split packages

To avoid split packages:

• ProjectedFieldName has been moved from io.quarkus.hibernate.orm.panache to io.quarkus.hibernate.orm.panache.common.

The original, now deprecated, classes haven been kept in 2.1 and will be removed in 2.2.

MongoDB with Panache split packages

To avoid split packages:

• MongoEntity has been moved from io.quarkus.mongodb.panache to io.quarkus.mongodb.panache.common.
• ProjectionFor has been moved from io.quarkus.mongodb.panache to io.quarkus.mongodb.panache.common.
• PanacheUpdate has been moved from io.quarkus.mongodb.panache to io.quarkus.mongodb.panache.common.
• ReactivePanacheUpdate has been moved from io.quarkus.mongodb.panache.reactive to io.quarkus.mongodb.panache.common.reactive.

The original, now deprecated, classes haven been kept in 2.1 and will be removed in 2.2.

Config

The @WithName annotation for @ConfigMapping now correctly used the name as is to map the configuration name and not a transformed version. Example:

@ConfigMapping
interface Server {
 @WithName("theHost")
 String server();
}

In Quarkus 2.x, the theHost name would map to the the-host configuration. Starting with Quarkus 2.1 it now maps with the exact name of theHost.

Hibernate Reactive

Hibernate Reactive needs to run on the Vert.x eventloop. Running it on other threads has never been supported and would likely lead to subtle to identify problems caused by unintended concurrency, but it wasn't checked.

Since Quarkus 2.1 there is an active guard protecting users from this mistake, so you'll see a runtime exception if you attemp to use it from the wrong thread.

We strongly recommend trying to design Reactive applications to stick to the pure event loop as that is the most efficient and best performing solution for a reactive app. If this doesn't apply to you, please consider using the classic version of Hibernate ORM which is more suited for applications which are not running on the eventloop.

OpenShift

Java command and arguments mapping

When deploying a Quarkus application into OpenShift, by default the container configuration to run the application looked like:

command: java
args:
    - '-Dquarkus.http.host=0.0.0.0'
    - '-Djava.util.logging.manager=org.jboss.logmanager.LogManager'
    - '-jar'
    - /deployments/quarkus-run.jar

Both command and args fields can be overriden via the quarkus.openshift.command and quarkus.openshift.arguments properties.

However, users can't simple append their custom Java arguments, for example: java -jar /deployments/quarkus-run.jar param1 param2. The only workaround was to copy and paste the existing content in the default args field and append the custom arguments param1 and param2.

This has been fixed in 2.0 by moving all the Java related parameters into the command field:

command: 
    - 'java'
    - '-Dquarkus.http.host=0.0.0.0'
    - '-Djava.util.logging.manager=org.jboss.logmanager.LogManager'
    - '-jar'
    - /deployments/quarkus-run.jar

Now, users can use the quarkus.openshift.arguments property to append their custom Java arguments, for example: quarkus.openshift.arguments=param1,param2.

SmallRye Fault Tolerance

Quarkus 2.1 updates SmallRye Fault Tolerance to version 5.2, which introduces a special mode, not compatible with the MicroProfile Fault Tolerance specification. In this mode, methods with fault tolerance annotations are automatically treated as non-blocking if they have an asynchronous return type (CompletionStage or Uni), even if they don't have any asynchronous annotation (@Asynchronous, @Blocking, @NonBlocking). If an annotation is present, it is of course still honored.

Quarkus enables this non-compatible mode by default. If you need strict compatibility with MicroProfile Fault Tolerance, you can set smallrye.faulttolerance.mp-compatibility=true. For more information, see https://smallrye.io/docs/smallrye-fault-tolerance/5.2.1/usage/extra.html#_non_compatible_mode

Quarkus Universe BOM is deprecated

In the Quarkus 2.1.0.Final release the io.quarkus:quarkus-universe-bom typically imported by Quarkus applications is deprecated in favor of the Quarkus platform member-specific BOMs:

• io.quarkus.platform:quarkus-bom:2.1.0.Final
• io.quarkus.platform:quarkus-optaplanner-bom:2.1.0.Final
• io.quarkus.platform:quarkus-kogito-bom:2.1.0.Final
• io.quarkus.platform:quarkus-qpid-jms-bom:2.1.0.Final
• io.quarkus.platform:quarkus-cassandra-bom:2.1.0.Final
• io.quarkus.platform:quarkus-camel-bom:2.1.0.Final
• io.quarkus.platform:quarkus-hazelcast-client:2.1.0.Final
• io.quarkus.platform:quarkus-debezium-bom:2.1.0.Final
• io.quarkus.platform:quarkus-blaze-persistence-bom:2.1.0.Final
• io.quarkus.platform:quarkus-google-cloud-services-bom:2.1.0.Final

The platform member-specific BOMs above are actually fragments of the legacy io.quarkus:quarkus-universe-bom and so it doesn't matter in which order they are imported in applications. The main advantage is that instead of enforcing all the dependency version constraints from the Quarkus "universe" BOM, applications may import only those constraints that are actually relevant to them. You can read more about this change in the blog post introducing this change.

NOTE: that the Quarkus dev tools, including code.quarkus.io, will now be generating projects importing the BOMs that are relevant to the extensions selected for the project to be created.

The io.quarkus:quarkus-universe-bom is still going to be released in the upcoming versions of the Quarkus platform in addition to the member-specific BOMs to give time for the existing applications to migrate to the new BOMs.