StructuredLoggingJsonMembersCustomizer implementations declared in spring.factories with a generic type more specific than Object are not called #43312
Description
package com.example; import org.springframework.boot.json.JsonWriter.Members; import org.springframework.boot.logging.structured.StructuredLoggingJsonMembersCustomizer; public class MyCustomizer implements StructuredLoggingJsonMembersCustomizer<String> { @Override public void customize(Members<String> members) { members.add("test", "value"); } }package com.example; import static org.assertj.core.api.Assertions.assertThat; import org.junit.jupiter.api.Test; import org.junit.jupiter.api.extension.ExtendWith; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.boot.test.system.CapturedOutput; import org.springframework.boot.test.system.OutputCaptureExtension; @SpringBootTest @ExtendWith(OutputCaptureExtension.class) public class MyCustomizerTests { @Test void test(CapturedOutput output) { assertThat(output).contains("{\"@timestamp\""); // structured logging is working assertThat(output).contains("\"test\":\"value\""); // MyCustomizer is working } }test failed with:
java.lang.AssertionError: Expecting actual: {"@timestamp":"2024-11-28T08:42:45.558754Z","log.level":"INFO","process.pid":71176,"process.thread.name":"main","log.logger":"com.example.MyCustomizerTests","message":"Starting MyCustomizerTests using Java 17.0.13 with PID 71176","ecs.version":"8.11"} {"@timestamp":"2024-11-28T08:42:45.562533Z","log.level":"INFO","process.pid":71176,"process.thread.name":"main","log.logger":"com.example.MyCustomizerTests","message":"No active profile set, falling back to 1 default profile: \"default\"","ecs.version":"8.11"} {"@timestamp":"2024-11-28T08:42:46.289631Z","log.level":"INFO","process.pid":71176,"process.thread.name":"main","log.logger":"com.example.MyCustomizerTests","message":"Started MyCustomizerTests in 0.939 seconds (process running for 1.622)","ecs.version":"8.11"} to contain: ""test":"value"" at com.example.MyCustomizerTests.test(MyCustomizerTests.java:18) at java.base/java.lang.reflect.Method.invoke(Method.java:569) at java.base/java.util.ArrayList.forEach(ArrayList.java:1511) at java.base/java.util.ArrayList.forEach(ArrayList.java:1511) Here is a reproducer project structured-logging.zip