Don't adapt RandomPropertySource

Stop adapting `RandomPropertySource` to `ConfigurationPropertySource`
since it's not useful as a binding source.

Closes gh-21659

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/properties/source/SpringConfigurationPropertySources.java

@@ -21,6 +21,7 @@ import java.util.Deque;
 import java.util.Iterator;
 import java.util.Map;
 import java.util.NoSuchElementException;
+import java.util.Random;
 import java.util.function.Function;
 
 import org.springframework.core.env.ConfigurableEnvironment;
@@ -123,10 +124,16 @@ class SpringConfigurationPropertySources implements Iterable<ConfigurationProper
 		}
 
 		private boolean isIgnored(PropertySource<?> candidate) {
-			return (candidate instanceof StubPropertySource
+			return (isRandomPropertySource(candidate) || candidate instanceof StubPropertySource
 					|| candidate instanceof ConfigurationPropertySourcesPropertySource);
 		}
 
+		private boolean isRandomPropertySource(PropertySource<?> candidate) {
+			Object source = candidate.getSource();
+			return (source instanceof Random) || (source instanceof PropertySource<?>
+					&& ((PropertySource<?>) source).getSource() instanceof Random);
+		}
+
 	}
 
 }

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/source/SpringConfigurationPropertySourcesTests.java

@@ -21,6 +21,7 @@ import java.util.Iterator;
 
 import org.junit.jupiter.api.Test;
 
+import org.springframework.boot.env.RandomValuePropertySource;
 import org.springframework.core.env.Environment;
 import org.springframework.core.env.MapPropertySource;
 import org.springframework.core.env.MutablePropertySources;
@@ -161,4 +162,15 @@ class SpringConfigurationPropertySourcesTests {
 		assertThat(configurationSources.iterator().next().getConfigurationProperty(name).getValue()).isEqualTo("s2");
 	}
 
+	@Test
+	void shouldNotAdaptRandomePropertySource() {
+		MutablePropertySources sources = new MutablePropertySources();
+		sources.addFirst(new RandomValuePropertySource());
+		sources.addFirst(new MapPropertySource("test", Collections.singletonMap("a", "b")));
+		Iterator<ConfigurationPropertySource> iterator = new SpringConfigurationPropertySources(sources).iterator();
+		ConfigurationPropertyName name = ConfigurationPropertyName.of("a");
+		assertThat(iterator.next().getConfigurationProperty(name).getValue()).isEqualTo("b");
+		assertThat(iterator.hasNext()).isFalse();
+	}
+
 }