More config issues in Quarkus 1.13.4.Final

[hrstoyanov]

Describe the bug

Consider this config setup:

@ConfigMapping(prefix = "dbproxy")
public interface DBProxyConfig {
    @WithName("thread_pool")
    Optional<ThreadPoolConfig> threadPool();
}

public interface ThreadPoolConfig {

    @WithName("prefix")
    @WithDefault("dbproxy-")
    String prefix();

    @WithName("min")
    @WithDefault("0")
    int minThreads();

    @WithName("max")
    @WithDefault("2147483647")//Integer.MAX_VALUE
    int maxThreads();

    @WithName("keep_alive_in_seconds")
    @WithDefault("60")
    int keepAliveInSeconds();
}

and this YAML config file:

dbproxy:
  thread_pool:
    prefix: mypool
    keep_alive_in_seconds: 10

Expected behavior

The thread pool configuration is extracted properly.

Actual behavior

Smallrye Config will fail to pick up the thread pool attributes, will default to an empty optional.

Bizarrely, we can make this work, if we do these changes:

public interface DBProxyConfig {
    @WithName("threadpool")
    Optional<ThreadPoolConfig> threadpool();
}

dbproxy:
  threadpool:
    prefix: mypool
    keep_alive_in_seconds: 10

but this is hardly acceptable! Note that changing the method name above to threadPool() will break it again!

Environment (please complete the following information):

Output of uname -a or ver

20.4.0 Darwin Kernel Version 20.4.0: Thu Apr 22 21:46:41 PDT 2021; root:xnu-7195.101.2~1/RELEASE_ARM64_T8101 arm64

Output of java -version

openjdk version "16.0.1" 2021-04-20
OpenJDK Runtime Environment (build 16.0.1+9)
OpenJDK 64-Bit Server VM (build 16.0.1+9, mixed mode)

Quarkus version or git rev

Quarkus 1.13.4.Final

Build tool (ie. output of mvnw --version or gradlew --version)

Gradle 7.0.1

Build time: 2021-05-10 16:08:58 UTC
Revision: 67e618faef187783dadd03a34fdab9dc71b85b19

Kotlin: 1.4.31
Groovy: 3.0.7
Ant: Apache Ant(TM) version 1.10.9 compiled on September 27 2020
JVM: 16.0.1 (BellSoft 16.0.1+9)
OS: Mac OS X 11.3.1 aarch64

[quarkus-bot]

/cc @evanchooly

[hrstoyanov]

@radcortez

[radcortez]

Fixed in smallrye/smallrye-config#570.