Restore support for binding random properties

Revert 0588e989af so that `@ConfigurationProperties` can again be
bound using values from the `RandomValuePropertySource`.

Fixes gh-26201

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

@@ -21,7 +21,6 @@ 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.boot.origin.OriginLookup;
@@ -132,16 +131,10 @@ class SpringConfigurationPropertySources implements Iterable<ConfigurationProper
 		}
 
 		private boolean isIgnored(PropertySource<?> candidate) {
-			return (isRandomPropertySource(candidate) || candidate instanceof StubPropertySource
+			return (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/ConfigurationPropertiesTests.java

@@ -65,6 +65,7 @@ import org.springframework.boot.convert.DurationUnit;
 import org.springframework.boot.convert.PeriodFormat;
 import org.springframework.boot.convert.PeriodStyle;
 import org.springframework.boot.convert.PeriodUnit;
+import org.springframework.boot.env.RandomValuePropertySource;
 import org.springframework.boot.testsupport.system.CapturedOutput;
 import org.springframework.boot.testsupport.system.OutputCaptureExtension;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
@@ -1061,6 +1062,18 @@ class ConfigurationPropertiesTests {
 		assertThat(bean.getA()).isEqualTo("baz");
 	}
 
+	@Test // gh-26201
+	void loadWhenBoundToRandomPropertyPlaceholder() {
+		MutablePropertySources sources = this.context.getEnvironment().getPropertySources();
+		sources.addFirst(new RandomValuePropertySource());
+		Map<String, Object> source = new HashMap<>();
+		source.put("com.example.bar", "${random.int}");
+		sources.addLast(new MapPropertySource("test", source));
+		load(SimplePrefixedProperties.class);
+		SimplePrefixedProperties bean = this.context.getBean(SimplePrefixedProperties.class);
+		assertThat(bean.getBar()).isNotNull().containsOnlyDigits();
+	}
+
 	@Test
 	void boundPropertiesShouldBeRecorded() {
 		load(NestedConfiguration.class, "name=foo", "nested.name=bar");

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -162,14 +162,13 @@ class SpringConfigurationPropertySourcesTests {
 		assertThat(configurationSources.iterator().next().getConfigurationProperty(name).getValue()).isEqualTo("s2");
 	}
 
-	@Test
-	void shouldNotAdaptRandomePropertySource() {
+	@Test // gh-21659
+	void shouldAdaptRandomePropertySource() {
 		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");
+		ConfigurationPropertyName name = ConfigurationPropertyName.of("random.int");
+		assertThat(iterator.next().getConfigurationProperty(name).getValue()).isNotNull();
 		assertThat(iterator.hasNext()).isFalse();
 	}