@ConfigurationProperties with @Validated - native build fails when annotations present on a record

[prettymama]

Suppose I have application.properties with this line

server.port = 8080

that I want to map with @ConfigurationProperties but instead of a class I place the annotation on a record (which is OK with Spring Boot)

@ConfigurationProperties("server")
@Validated
public record ServerConfiguration(@Min(1) int port) {}

The AOT processor tries to proxy it and fails as it cannot be done.

java.lang.IllegalArgumentException: Cannot subclass primitive, array or final types: class xxx.ServerConfiguration
        at net.bytebuddy.ByteBuddy.subclass(ByteBuddy.java:406)
        at net.bytebuddy.ByteBuddy.subclass(ByteBuddy.java:379)
        at net.bytebuddy.ByteBuddy.subclass(ByteBuddy.java:276)
        at org.springframework.aop.framework.ProxyGenerator.getProxyBytes(ProxyGenerator.java:80)
        at org.springframework.aot.nativex.ConfigurationContributor.generateBuildTimeClassProxy(ConfigurationContributor.java:193)
        at org.springframework.aot.nativex.ConfigurationContributor.generateBuildTimeClassProxies(ConfigurationContributor.java:170)
        at org.springframework.aot.nativex.ConfigurationContributor.processBuildTimeClassProxyRequests(ConfigurationContributor.java:142)
        at org.springframework.aot.nativex.ConfigurationContributor.contribute(ConfigurationContributor.java:74)
        at org.springframework.aot.build.BootstrapCodeGenerator.generate(BootstrapCodeGenerator.java:91)
        at org.springframework.aot.build.BootstrapCodeGenerator.generate(BootstrapCodeGenerator.java:71)
        at org.springframework.aot.build.GenerateBootstrapCommand.call(GenerateBootstrapCommand.java:107)
        at org.springframework.aot.build.GenerateBootstrapCommand.call(GenerateBootstrapCommand.java:42)
        at picocli.CommandLine.executeUserObject(CommandLine.java:1953)
        at picocli.CommandLine.access$1300(CommandLine.java:145)
        at picocli.CommandLine$RunLast.executeUserObjectOfLastSubcommandWithSameParent(CommandLine.java:2352)
        at picocli.CommandLine$RunLast.handle(CommandLine.java:2346)
        at picocli.CommandLine$RunLast.handle(CommandLine.java:2311)
        at picocli.CommandLine$AbstractParseResultHandler.execute(CommandLine.java:2179)
        at picocli.CommandLine.execute(CommandLine.java:2078)
        at org.springframework.aot.build.GenerateBootstrapCommand.main(GenerateBootstrapCommand.java:112)
java.lang.IllegalStateException: Problem creating proxy with configuration: org.springframework.aop.framework.ProxyConfiguration@6571616c
        at org.springframework.aop.framework.ProxyGenerator.getProxyBytes(ProxyGenerator.java:94)
        at org.springframework.aot.nativex.ConfigurationContributor.generateBuildTimeClassProxy(ConfigurationContributor.java:193)
        at org.springframework.aot.nativex.ConfigurationContributor.generateBuildTimeClassProxies(ConfigurationContributor.java:170)
        at org.springframework.aot.nativex.ConfigurationContributor.processBuildTimeClassProxyRequests(ConfigurationContributor.java:142)
        at org.springframework.aot.nativex.ConfigurationContributor.contribute(ConfigurationContributor.java:74)
        at org.springframework.aot.build.BootstrapCodeGenerator.generate(BootstrapCodeGenerator.java:91)
        at org.springframework.aot.build.BootstrapCodeGenerator.generate(BootstrapCodeGenerator.java:71)
        at org.springframework.aot.build.GenerateBootstrapCommand.call(GenerateBootstrapCommand.java:107)
        at org.springframework.aot.build.GenerateBootstrapCommand.call(GenerateBootstrapCommand.java:42)
        at picocli.CommandLine.executeUserObject(CommandLine.java:1953)
        at picocli.CommandLine.access$1300(CommandLine.java:145)
        at picocli.CommandLine$RunLast.executeUserObjectOfLastSubcommandWithSameParent(CommandLine.java:2352)
        at picocli.CommandLine$RunLast.handle(CommandLine.java:2346)
        at picocli.CommandLine$RunLast.handle(CommandLine.java:2311)
        at picocli.CommandLine$AbstractParseResultHandler.execute(CommandLine.java:2179)
        at picocli.CommandLine.execute(CommandLine.java:2078)
        at org.springframework.aot.build.GenerateBootstrapCommand.main(GenerateBootstrapCommand.java:112)
Caused by: java.lang.IllegalArgumentException: Cannot subclass primitive, array or final types: class xxx.ServerConfiguration
        at net.bytebuddy.ByteBuddy.subclass(ByteBuddy.java:406)
        at net.bytebuddy.ByteBuddy.subclass(ByteBuddy.java:379)
        at net.bytebuddy.ByteBuddy.subclass(ByteBuddy.java:276)
        at org.springframework.aop.framework.ProxyGenerator.getProxyBytes(ProxyGenerator.java:80)
        ... 16 more

Spring Boot: 2.6.2
Spring Native: 0.11.1
GraalVM: 21.3.0 CE

[sdeleuze]

Could you please try with:

• record without @Validated
• class with @Validated

To qualify more precisely the source of the error?

[prettymama]

class with @Validated works, I have it currently as a workaround.
record without @Validated builds and runs OK.

[prettymama]

I tried some experimentation and it seems that when the configuration is a bit more "complex" (multilayered), configuration values are not bound to properties.

e.g.
Configuration

servers:
  server: 
    port: 10001

Records:

@ConfigurationProperties("servers")
public record ServersConfiguration(ServerConfiguration server) {
  public record ServerConfiguration(int port) {
    public ServerConfiguration{
      System.out.println("Port: " + port);
    }
  }
}

In native image the Port: 10001 is not printed out, in JVM version it's OK.

Removing one layer:

server: 
  port: 10001

@ConfigurationProperties("server")
public record ServerConfiguration(int port) {
  public ServerConfiguration{
    System.out.println("Port: " + port);
  }
}

and the line is printed.

[sdeleuze]

Notice it works with:

@ConfigurationProperties("servers")
@ConstructorBinding
public record ServersConfiguration(ServerConfiguration server) {
  public record ServerConfiguration(int port) {
    public ServerConfiguration{
      System.out.println("Port: " + port);
    }
  }
}

I have asked a feedback to Boot team to refine Spring native handling for that use case.

[sdeleuze]

The proxy issue is likely a duplicate of #969, I will create another one for the proper nested record detection.