Revert "Merge pull request #21060 from dsyer"

This reverts commit 6547ea5, reversing
changes made to e9e4a34.

Fixes gh-22039

Author: wilkinsona

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/mustache/MustacheEnvironmentCollector.java

@@ -19,7 +19,6 @@
 import com.samskivert.mustache.DefaultCollector;
 import com.samskivert.mustache.Mustache.Collector;
 import com.samskivert.mustache.Mustache.VariableFetcher;
-import com.samskivert.mustache.Template;
 
 import org.springframework.context.EnvironmentAware;
 import org.springframework.core.env.ConfigurableEnvironment;
@@ -36,56 +35,29 @@ public class MustacheEnvironmentCollector extends DefaultCollector implements En
 
 	private ConfigurableEnvironment environment;
 
+	private final VariableFetcher propertyFetcher = new PropertyVariableFetcher();
+
 	@Override
 	public void setEnvironment(Environment environment) {
 		this.environment = (ConfigurableEnvironment) environment;
 	}
 
 	@Override
 	public VariableFetcher createFetcher(Object ctx, String name) {
-		VariableFetcher nativeFetcher = super.createFetcher(ctx, name);
-		if (nativeFetcher != null) {
-			return new PropertyVariableFetcher(nativeFetcher);
+		VariableFetcher fetcher = super.createFetcher(ctx, name);
+		if (fetcher != null) {
+			return fetcher;
 		}
 		if (this.environment.containsProperty(name)) {
-			return new PropertyVariableFetcher();
+			return this.propertyFetcher;
 		}
 		return null;
 	}
 
-	/**
-	 * {@link VariableFetcher} that also checks the {@link Environment}.
-	 */
 	private class PropertyVariableFetcher implements VariableFetcher {
 
-		private final VariableFetcher nativeFetcher;
-
-		PropertyVariableFetcher() {
-			this.nativeFetcher = null;
-		}
-
-		PropertyVariableFetcher(VariableFetcher delegate) {
-			this.nativeFetcher = delegate;
-		}
-
 		@Override
 		public Object get(Object ctx, String name) {
-			Object result = getFromNativeFetcher(ctx, name);
-			result = (result != null) ? result : getFromEnvironment(name);
-			return (result != null) ? result : Template.NO_FETCHER_FOUND;
-		}
-
-		private Object getFromNativeFetcher(Object ctx, String name) {
-			try {
-				Object result = (this.nativeFetcher != null) ? this.nativeFetcher.get(ctx, name) : null;
-				return (result != Template.NO_FETCHER_FOUND) ? result : null;
-			}
-			catch (Exception ex) {
-				return null;
-			}
-		}
-
-		private Object getFromEnvironment(String name) {
 			return MustacheEnvironmentCollector.this.environment.getProperty(name);
 		}
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mustache/MustacheStandaloneIntegrationTests.java

@@ -37,7 +37,7 @@
  * @author Dave Syer
  */
 @DirtiesContext
-@SpringBootTest(webEnvironment = WebEnvironment.NONE, properties = { "env.FOO=There", "foo=World", "bar.name=Bar" })
+@SpringBootTest(webEnvironment = WebEnvironment.NONE, properties = { "env.FOO=There", "foo=World" })
 class MustacheStandaloneIntegrationTests {
 
 	@Autowired
@@ -60,53 +60,15 @@ void environmentCollectorCompoundKeyStandard() {
 				.isEqualTo("Hello: There");
 	}
 
-	@Test
-	void environmentCollectorCompoundKeyStandardMap() {
-		assertThat(this.compiler.standardsMode(true).compile("Hello: {{env.foo}}")
-				.execute(Collections.singletonMap("world", "World"))).isEqualTo("Hello: There");
-	}
-
-	@Test
-	void environmentCollectorCompoundKeyWithBean() {
-		assertThat(this.compiler.compile("Hello: {{foo.name}}").execute(Collections.singletonMap("foo", new Foo())))
-				.isEqualTo("Hello: Foo");
-	}
-
-	@Test
-	void environmentCollectorCompoundKeyWithBeanPrefersEnvironment() {
-		assertThat(this.compiler.compile("Hello: {{bar.name}}").execute(Collections.singletonMap("bar", new Foo())))
-				.isEqualTo("Hello: Bar");
-	}
-
 	@Test
 	void environmentCollectorSimpleKey() {
 		assertThat(this.compiler.compile("Hello: {{foo}}").execute(new Object())).isEqualTo("Hello: World");
 	}
 
-	@Test
-	void environmentCollectorSimpleKeyMap() {
-		assertThat(this.compiler.compile("Hello: {{foo}}").execute(Collections.singletonMap("world", "Foo")))
-				.isEqualTo("Hello: World");
-	}
-
 	@Configuration(proxyBeanMethods = false)
 	@Import({ MustacheAutoConfiguration.class, PropertyPlaceholderAutoConfiguration.class })
 	static class Application {
 
 	}
 
-	static class Foo {
-
-		private String name = "Foo";
-
-		String getName() {
-			return this.name;
-		}
-
-		void setName(String name) {
-			this.name = name;
-		}
-
-	}
-
 }