Refine Mustache support

Refine Mustache support to provide a cleaner separation between the
reactive and servlet implementations. The views have now moved to the
`spring-boot` project and the auto-configuration has been split into
two distinct `@Imports` to save needing full package declarations.

See gh-8941

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/mobile/DeviceDelegatingViewResolverAutoConfiguration.java

@@ -28,10 +28,10 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplicat
 import org.springframework.boot.autoconfigure.freemarker.FreeMarkerAutoConfiguration;
 import org.springframework.boot.autoconfigure.groovy.template.GroovyTemplateAutoConfiguration;
 import org.springframework.boot.autoconfigure.mustache.MustacheAutoConfiguration;
-import org.springframework.boot.autoconfigure.mustache.servlet.MustacheViewResolver;
 import org.springframework.boot.autoconfigure.thymeleaf.ThymeleafAutoConfiguration;
 import org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.boot.web.servlet.view.MustacheViewResolver;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.mobile.device.view.LiteDeviceDelegatingViewResolver;

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

@@ -20,7 +20,6 @@ import javax.annotation.PostConstruct;
 
 import com.samskivert.mustache.Mustache;
 import com.samskivert.mustache.Mustache.Collector;
-import com.samskivert.mustache.Mustache.Compiler;
 import com.samskivert.mustache.Mustache.TemplateLoader;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
@@ -28,15 +27,12 @@ import org.apache.commons.logging.LogFactory;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
-import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
-import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication.Type;
-import org.springframework.boot.autoconfigure.mustache.servlet.MustacheViewResolver;
 import org.springframework.boot.autoconfigure.template.TemplateLocation;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.core.Ordered;
+import org.springframework.context.annotation.Import;
 import org.springframework.core.env.Environment;
 
 /**
@@ -49,6 +45,7 @@ import org.springframework.core.env.Environment;
 @Configuration
 @ConditionalOnClass(Mustache.class)
 @EnableConfigurationProperties(MustacheProperties.class)
+@Import({ MustacheServletWebConfiguration.class, MustacheReactiveWebConfiguration.class })
 public class MustacheAutoConfiguration {
 
 	private static final Log logger = LogFactory.getLog(MustacheAutoConfiguration.class);
@@ -101,56 +98,4 @@ public class MustacheAutoConfiguration {
 		return loader;
 	}
 
-	@Configuration
-	@ConditionalOnWebApplication(type = Type.SERVLET)
-	protected static class MustacheWebConfiguration {
-
-		private final MustacheProperties mustache;
-
-		protected MustacheWebConfiguration(MustacheProperties mustache) {
-			this.mustache = mustache;
-		}
-
-		@Bean
-		@ConditionalOnMissingBean(MustacheViewResolver.class)
-		public MustacheViewResolver mustacheViewResolver(Compiler mustacheCompiler) {
-			MustacheViewResolver resolver = new MustacheViewResolver(mustacheCompiler);
-			this.mustache.applyToViewResolver(resolver);
-			resolver.setCharset(this.mustache.getCharsetName());
-			resolver.setOrder(Ordered.LOWEST_PRECEDENCE - 10);
-			return resolver;
-		}
-
-	}
-
-	@Configuration
-	@ConditionalOnWebApplication(type = Type.REACTIVE)
-	protected static class MustacheReactiveWebConfiguration {
-
-		private final MustacheProperties mustache;
-
-		protected MustacheReactiveWebConfiguration(MustacheProperties mustache) {
-			this.mustache = mustache;
-		}
-
-		@Bean
-		@ConditionalOnMissingBean(org.springframework.boot.autoconfigure
-				.mustache.reactive.MustacheViewResolver.class)
-		public org.springframework.boot.autoconfigure
-				.mustache.reactive.MustacheViewResolver mustacheViewResolver(Compiler mustacheCompiler) {
-			org.springframework.boot.autoconfigure
-					.mustache.reactive.MustacheViewResolver resolver
-					= new org.springframework.boot.autoconfigure
-					.mustache.reactive.MustacheViewResolver(mustacheCompiler);
-			resolver.setPrefix(this.mustache.getPrefix());
-			resolver.setSuffix(this.mustache.getSuffix());
-			resolver.setViewNames(this.mustache.getViewNames());
-			resolver.setRequestContextAttribute(this.mustache.getRequestContextAttribute());
-			resolver.setCharset(this.mustache.getCharsetName());
-			resolver.setOrder(Ordered.LOWEST_PRECEDENCE - 10);
-			return resolver;
-		}
-
-	}
-
 }

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

+/*
+ * Copyright 2012-2017 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.autoconfigure.mustache;
+
+import com.samskivert.mustache.Mustache.Compiler;
+
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication.Type;
+import org.springframework.boot.web.reactive.result.view.MustacheViewResolver;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.Ordered;
+
+@Configuration
+@ConditionalOnWebApplication(type = Type.REACTIVE)
+class MustacheReactiveWebConfiguration {
+
+	private final MustacheProperties mustache;
+
+	protected MustacheReactiveWebConfiguration(MustacheProperties mustache) {
+		this.mustache = mustache;
+	}
+
+	@Bean
+	@ConditionalOnMissingBean(MustacheViewResolver.class)
+	public MustacheViewResolver mustacheViewResolver(Compiler mustacheCompiler) {
+		MustacheViewResolver resolver = new MustacheViewResolver(mustacheCompiler);
+		resolver.setPrefix(this.mustache.getPrefix());
+		resolver.setSuffix(this.mustache.getSuffix());
+		resolver.setViewNames(this.mustache.getViewNames());
+		resolver.setRequestContextAttribute(this.mustache.getRequestContextAttribute());
+		resolver.setCharset(this.mustache.getCharsetName());
+		resolver.setOrder(Ordered.LOWEST_PRECEDENCE - 10);
+		return resolver;
+	}
+
+}

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

@@ -20,6 +20,7 @@ import java.io.InputStreamReader;
 import java.io.Reader;
 
 import com.samskivert.mustache.Mustache;
+import com.samskivert.mustache.Mustache.Compiler;
 import com.samskivert.mustache.Mustache.TemplateLoader;
 
 import org.springframework.context.ResourceLoaderAware;
@@ -30,8 +31,8 @@ import org.springframework.core.io.ResourceLoader;
 /**
  * Mustache TemplateLoader implementation that uses a prefix, suffix and the Spring
  * Resource abstraction to load a template from a file, classpath, URL etc. A
- * TemplateLoader is needed in the Compiler when you want to render partials (i.e.
- * tiles-like features).
+ * {@link TemplateLoader} is needed in the {@link Compiler} when you want to render
+ * partials (i.e. tiles-like features).
  *
  * @author Dave Syer
  * @since 1.2.2

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

+/*
+ * Copyright 2012-2017 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.autoconfigure.mustache;
+
+import com.samskivert.mustache.Mustache.Compiler;
+
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication.Type;
+import org.springframework.boot.web.servlet.view.MustacheViewResolver;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.Ordered;
+
+@Configuration
+@ConditionalOnWebApplication(type = Type.SERVLET)
+class MustacheServletWebConfiguration {
+
+	private final MustacheProperties mustache;
+
+	protected MustacheServletWebConfiguration(MustacheProperties mustache) {
+		this.mustache = mustache;
+	}
+
+	@Bean
+	@ConditionalOnMissingBean(MustacheViewResolver.class)
+	public MustacheViewResolver mustacheViewResolver(Compiler mustacheCompiler) {
+		MustacheViewResolver resolver = new MustacheViewResolver(mustacheCompiler);
+		this.mustache.applyToViewResolver(resolver);
+		resolver.setCharset(this.mustache.getCharsetName());
+		resolver.setOrder(Ordered.LOWEST_PRECEDENCE - 10);
+		return resolver;
+	}
+
+}

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mobile/DeviceDelegatingViewResolverAutoConfigurationTests.java

@@ -34,10 +34,10 @@ import org.springframework.boot.autoconfigure.freemarker.FreeMarkerAutoConfigura
 import org.springframework.boot.autoconfigure.groovy.template.GroovyTemplateAutoConfiguration;
 import org.springframework.boot.autoconfigure.http.HttpMessageConvertersAutoConfiguration;
 import org.springframework.boot.autoconfigure.mustache.MustacheAutoConfiguration;
-import org.springframework.boot.autoconfigure.mustache.servlet.MustacheViewResolver;
 import org.springframework.boot.autoconfigure.thymeleaf.ThymeleafAutoConfiguration;
 import org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration;
 import org.springframework.boot.test.util.EnvironmentTestUtils;
+import org.springframework.boot.web.servlet.view.MustacheViewResolver;
 import org.springframework.core.Ordered;
 import org.springframework.mobile.device.view.LiteDeviceDelegatingViewResolver;
 import org.springframework.mock.web.MockServletContext;

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mustache/reactive/MustacheWebIntegrationTests.java → spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mustache/MustacheAutoConfigurationReactiveIntegrationTests.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.springframework.boot.autoconfigure.mustache.reactive;
+package org.springframework.boot.autoconfigure.mustache;
 
 import java.util.Date;
 
@@ -26,13 +26,13 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.WebApplicationType;
 import org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration;
-import org.springframework.boot.autoconfigure.mustache.MustacheAutoConfiguration;
-import org.springframework.boot.autoconfigure.mustache.MustacheResourceTemplateLoader;
 import org.springframework.boot.autoconfigure.web.reactive.HttpHandlerAutoConfiguration;
 import org.springframework.boot.autoconfigure.web.reactive.ReactiveWebServerAutoConfiguration;
 import org.springframework.boot.autoconfigure.web.reactive.WebFluxAutoConfiguration;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
+import org.springframework.boot.web.reactive.result.view.MustacheView;
+import org.springframework.boot.web.reactive.result.view.MustacheViewResolver;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Import;
@@ -51,34 +51,30 @@ import static org.assertj.core.api.Assertions.assertThat;
  * @author Brian Clozel
  */
 @RunWith(SpringRunner.class)
-@SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT,
-		properties = "spring.main.web-application-type=reactive")
-public class MustacheWebIntegrationTests {
+@SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT, properties = "spring.main.web-application-type=reactive")
+public class MustacheAutoConfigurationReactiveIntegrationTests {
 
 	@Autowired
 	private WebTestClient client;
 
 	@Test
 	public void testHomePage() throws Exception {
-		String result = (String) this.client.get().uri("/").exchange()
-				.expectStatus().isOk()
+		String result = this.client.get().uri("/").exchange().expectStatus().isOk()
 				.expectBody(String.class).returnResult().getResponseBody();
 		assertThat(result).contains("Hello App").contains("Hello World");
 	}
 
 	@Test
 	public void testPartialPage() throws Exception {
-		String result = (String) this.client.get().uri("/partial").exchange()
-				.expectStatus().isOk()
+		String result = this.client.get().uri("/partial").exchange().expectStatus().isOk()
 				.expectBody(String.class).returnResult().getResponseBody();
 		assertThat(result).contains("Hello App").contains("Hello World");
 	}
 
 	@Configuration
-	@Import({ReactiveWebServerAutoConfiguration.class,
-			WebFluxAutoConfiguration.class,
+	@Import({ ReactiveWebServerAutoConfiguration.class, WebFluxAutoConfiguration.class,
 			HttpHandlerAutoConfiguration.class,
-			PropertyPlaceholderAutoConfiguration.class})
+			PropertyPlaceholderAutoConfiguration.class })
 	@Controller
 	public static class Application {
 
@@ -101,7 +97,8 @@ public class MustacheWebIntegrationTests {
 		@Bean
 		public MustacheViewResolver viewResolver() {
 			Mustache.Compiler compiler = Mustache.compiler().withLoader(
-					new MustacheResourceTemplateLoader("classpath:/mustache-templates/", ".html"));
+					new MustacheResourceTemplateLoader("classpath:/mustache-templates/",
+							".html"));
 			MustacheViewResolver resolver = new MustacheViewResolver(compiler);
 			resolver.setPrefix("classpath:/mustache-templates/");
 			resolver.setSuffix(".html");

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mustache/servlet/MustacheWebIntegrationTests.java → spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mustache/MustacheAutoConfigurationServletIntegrationTests.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.springframework.boot.autoconfigure.mustache.servlet;
+package org.springframework.boot.autoconfigure.mustache;
 
 import java.lang.annotation.Documented;
 import java.lang.annotation.ElementType;
@@ -34,14 +34,14 @@ import org.junit.runner.RunWith;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration;
-import org.springframework.boot.autoconfigure.mustache.MustacheAutoConfiguration;
-import org.springframework.boot.autoconfigure.mustache.MustacheResourceTemplateLoader;
 import org.springframework.boot.autoconfigure.web.servlet.DispatcherServletAutoConfiguration;
 import org.springframework.boot.autoconfigure.web.servlet.ServletWebServerFactoryAutoConfiguration;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
 import org.springframework.boot.test.web.client.TestRestTemplate;
 import org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext;
+import org.springframework.boot.web.servlet.view.MustacheView;
+import org.springframework.boot.web.servlet.view.MustacheViewResolver;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Import;
@@ -61,7 +61,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 @RunWith(SpringRunner.class)
 @DirtiesContext
 @SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)
-public class MustacheWebIntegrationTests {
+public class MustacheAutoConfigurationServletIntegrationTests {
 
 	@Autowired
 	private ServletWebServerApplicationContext context;
@@ -79,8 +79,7 @@ public class MustacheWebIntegrationTests {
 		Template tmpl = Mustache.compiler().compile(source);
 		Map<String, String> context = new HashMap<>();
 		context.put("arg", "world");
-		assertThat(tmpl.execute(context)).isEqualTo("Hello world!"); // returns "Hello
-																		// world!"
+		assertThat(tmpl.execute(context)).isEqualTo("Hello world!");
 	}
 
 	@Test
@@ -120,8 +119,8 @@ public class MustacheWebIntegrationTests {
 
 		@Bean
 		public MustacheViewResolver viewResolver() {
-			Mustache.Compiler compiler = Mustache.compiler()
-					.withLoader(new MustacheResourceTemplateLoader("classpath:/mustache-templates/",
+			Mustache.Compiler compiler = Mustache.compiler().withLoader(
+					new MustacheResourceTemplateLoader("classpath:/mustache-templates/",
 							".html"));
 			MustacheViewResolver resolver = new MustacheViewResolver(compiler);
 			resolver.setPrefix("classpath:/mustache-templates/");

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

@@ -19,9 +19,9 @@ package org.springframework.boot.autoconfigure.mustache;
 import com.samskivert.mustache.Mustache;
 import org.junit.Test;
 
-import org.springframework.boot.autoconfigure.mustache.servlet.MustacheViewResolver;
 import org.springframework.boot.test.util.EnvironmentTestUtils;
 import org.springframework.boot.web.reactive.context.GenericReactiveWebApplicationContext;
+import org.springframework.boot.web.servlet.view.MustacheViewResolver;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Import;
@@ -64,7 +64,7 @@ public class MustacheAutoConfigurationTests {
 		assertThat(this.reactiveWebContext.getBeansOfType(MustacheResourceTemplateLoader.class)).hasSize(1);
 		assertThat(this.reactiveWebContext.getBeansOfType(MustacheViewResolver.class)).isEmpty();
 		assertThat(this.reactiveWebContext
-				.getBeansOfType(org.springframework.boot.autoconfigure.mustache.reactive.MustacheViewResolver.class)
+				.getBeansOfType(org.springframework.boot.web.reactive.result.view.MustacheViewResolver.class)
 		).hasSize(1);
 	}
 
@@ -76,7 +76,7 @@ public class MustacheAutoConfigurationTests {
 		assertThat(this.reactiveWebContext.getBeansOfType(MustacheResourceTemplateLoader.class)).hasSize(1);
 		assertThat(this.reactiveWebContext.getBeansOfType(MustacheViewResolver.class)).isEmpty();
 		assertThat(this.reactiveWebContext
-				.getBeansOfType(org.springframework.boot.autoconfigure.mustache.reactive.MustacheViewResolver.class)
+				.getBeansOfType(org.springframework.boot.web.reactive.result.view.MustacheViewResolver.class)
 		).hasSize(1);
 		assertThat(this.reactiveWebContext.getBean(Mustache.Compiler.class).standardsMode).isTrue();
 	}

spring-boot-parent/src/checkstyle/import-control.xml

@@ -50,6 +50,9 @@
 				<allow pkg="org.springframework.boot.web.servlet" />
 				<allow pkg="org.springframework.boot.web.server" />
 			</subpackage>
+			<subpackage name="view">
+				<allow pkg="org.springframework.web.servlet" />
+			</subpackage>
 		</subpackage>
 
 		<!-- Reactive -->
@@ -63,6 +66,11 @@
 				<allow pkg="org.springframework.boot.web.server" />
 				<disallow pkg="org.springframework.context" />
 			</subpackage>
+			<subpackage name="result">
+				<subpackage name="view">
+					<allow pkg="org.springframework.boot.web.reactive.result.view" />
+				</subpackage>
+			</subpackage>
 		</subpackage>
 
 		<!-- Embedded Servers -->

spring-boot/pom.xml

@@ -54,6 +54,11 @@
 			<artifactId>jackson-databind</artifactId>
 			<optional>true</optional>
 		</dependency>
+		<dependency>
+			<groupId>com.samskivert</groupId>
+			<artifactId>jmustache</artifactId>
+			<optional>true</optional>
+		</dependency>
 		<dependency>
 			<groupId>com.sendgrid</groupId>
 			<artifactId>sendgrid-java</artifactId>

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/mustache/reactive/MustacheView.java → spring-boot/src/main/java/org/springframework/boot/web/reactive/result/view/MustacheView.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.springframework.boot.autoconfigure.mustache.reactive;
+package org.springframework.boot.web.reactive.result.view;
 
 import java.io.IOException;
 import java.io.InputStreamReader;
@@ -26,7 +26,7 @@ import java.util.Locale;
 import java.util.Map;
 import java.util.Optional;
 
-import com.samskivert.mustache.Mustache;
+import com.samskivert.mustache.Mustache.Compiler;
 import com.samskivert.mustache.Template;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
@@ -46,18 +46,17 @@ import org.springframework.web.server.ServerWebExchange;
  */
 public class MustacheView extends AbstractUrlBasedView {
 
-	private Mustache.Compiler compiler;
+	private Compiler compiler;
 
 	private String charset;
 
 	/**
-	 * Set the JMustache compiler to be used by this view.
-	 * <p>Typically this property is not set directly. Instead a single
-	 * {@link Mustache.Compiler} is expected in the Spring application context
-	 * which is used to compile Mustache templates.
+	 * Set the JMustache compiler to be used by this view. Typically this property is not
+	 * set directly. Instead a single {@link Compiler} is expected in the Spring
+	 * application context which is used to compile Mustache templates.
 	 * @param compiler the Mustache compiler
 	 */
-	public void setCompiler(Mustache.Compiler compiler) {
+	public void setCompiler(Compiler compiler) {
 		this.compiler = compiler;
 	}
 
@@ -74,27 +73,20 @@ public class MustacheView extends AbstractUrlBasedView {
 		return resolveResource() != null;
 	}
 
-	private Resource resolveResource() {
-		Resource resource = getApplicationContext().getResource(getUrl());
-		if (resource == null || !resource.exists()) {
-			return null;
-		}
-		return resource;
-	}
-
 	@Override
-	protected Mono<Void> renderInternal(Map<String, Object> model,
-			MediaType contentType, ServerWebExchange exchange) {
+	protected Mono<Void> renderInternal(Map<String, Object> model, MediaType contentType,
+			ServerWebExchange exchange) {
 		Resource resource = resolveResource();
 		if (resource == null) {
-			return Mono.error(new IllegalStateException("Could not find Mustache template with URL ["
-					+ getUrl() + "]"));
+			return Mono.error(new IllegalStateException(
+					"Could not find Mustache template with URL [" + getUrl() + "]"));
 		}
 		DataBuffer dataBuffer = exchange.getResponse().bufferFactory().allocateBuffer();
 		try (Reader reader = getReader(resource)) {
 			Template template = this.compiler.compile(reader);
 			Charset charset = getCharset(contentType).orElse(getDefaultCharset());
-			try (Writer writer = new OutputStreamWriter(dataBuffer.asOutputStream(), charset)) {
+			try (Writer writer = new OutputStreamWriter(dataBuffer.asOutputStream(),
+					charset)) {
 				template.execute(model, writer);
 				writer.flush();
 			}
@@ -105,6 +97,14 @@ public class MustacheView extends AbstractUrlBasedView {
 		return exchange.getResponse().writeWith(Flux.just(dataBuffer));
 	}
 
+	private Resource resolveResource() {
+		Resource resource = getApplicationContext().getResource(getUrl());
+		if (resource == null || !resource.exists()) {
+			return null;
+		}
+		return resource;
+	}
+
 	private Reader getReader(Resource resource) throws IOException {
 		if (this.charset != null) {
 			return new InputStreamReader(resource.getInputStream(), this.charset);
@@ -113,6 +113,7 @@ public class MustacheView extends AbstractUrlBasedView {
 	}
 
 	private Optional<Charset> getCharset(MediaType mediaType) {
-		return (mediaType != null ? Optional.ofNullable(mediaType.getCharset()) : Optional.empty());
+		return Optional.ofNullable(mediaType != null ? mediaType.getCharset() : null);
 	}
+
 }

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/mustache/reactive/MustacheViewResolver.java → spring-boot/src/main/java/org/springframework/boot/web/reactive/result/view/MustacheViewResolver.java

@@ -14,9 +14,10 @@
  * limitations under the License.
  */
 
-package org.springframework.boot.autoconfigure.mustache.reactive;
+package org.springframework.boot.web.reactive.result.view;
 
 import com.samskivert.mustache.Mustache;
+import com.samskivert.mustache.Mustache.Compiler;
 
 import org.springframework.web.reactive.result.view.AbstractUrlBasedView;
 import org.springframework.web.reactive.result.view.UrlBasedViewResolver;
@@ -30,13 +31,13 @@ import org.springframework.web.reactive.result.view.ViewResolver;
  */
 public class MustacheViewResolver extends UrlBasedViewResolver {
 
-	private final Mustache.Compiler compiler;
+	private final Compiler compiler;
 
 	private String charset;
 
 	/**
-	 * Create a {@code MustacheViewResolver} backed by a default
-	 * instance of a {@link Mustache.Compiler}.
+	 * Create a {@code MustacheViewResolver} backed by a default instance of a
+	 * {@link Compiler}.
 	 */
 	public MustacheViewResolver() {
 		this.compiler = Mustache.compiler();
@@ -44,11 +45,11 @@ public class MustacheViewResolver extends UrlBasedViewResolver {
 	}
 
 	/**
-	 * Create a {@code MustacheViewResolver} backed by a custom
-	 * instance of a {@link Mustache.Compiler}.
+	 * Create a {@code MustacheViewResolver} backed by a custom instance of a
+	 * {@link Compiler}.
 	 * @param compiler the Mustache compiler used to compile templates
 	 */
-	public MustacheViewResolver(Mustache.Compiler compiler) {
+	public MustacheViewResolver(Compiler compiler) {
 		this.compiler = compiler;
 		setViewClass(requiredViewClass());
 	}

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/mustache/servlet/package-info.java → spring-boot/src/main/java/org/springframework/boot/web/reactive/result/view/package-info.java

@@ -15,6 +15,7 @@
  */
 
 /**
- * Auto-configuration for Mustache with Spring MVC.
+ * Additional {@link org.springframework.web.reactive.result.view.View Views} for use with
+ * WebFlux.
  */
-package org.springframework.boot.autoconfigure.mustache.servlet;
+package org.springframework.boot.web.reactive.result.view;

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/mustache/servlet/MustacheView.java → spring-boot/src/main/java/org/springframework/boot/web/servlet/view/MustacheView.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.springframework.boot.autoconfigure.mustache.servlet;
+package org.springframework.boot.web.servlet.view;
 
 import java.io.IOException;
 import java.io.InputStreamReader;
@@ -25,7 +25,7 @@ import java.util.Map;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
-import com.samskivert.mustache.Mustache;
+import com.samskivert.mustache.Mustache.Compiler;
 import com.samskivert.mustache.Template;
 
 import org.springframework.core.io.Resource;
@@ -42,18 +42,19 @@ import org.springframework.web.servlet.view.AbstractTemplateView;
  */
 public class MustacheView extends AbstractTemplateView {
 
-	private Mustache.Compiler compiler;
+	private Compiler compiler;
 
 	private String charset;
 
 	/**
 	 * Set the Mustache compiler to be used by this view.
-	 * <p>Typically this property is not set directly. Instead a single
-	 * {@link Mustache.Compiler} is expected in the Spring application context
-	 * which is used to compile Mustache templates.
+	 * <p>
+	 * Typically this property is not set directly. Instead a single {@link Compiler} is
+	 * expected in the Spring application context which is used to compile Mustache
+	 * templates.
 	 * @param compiler the Mustache compiler
 	 */
-	public void setCompiler(Mustache.Compiler compiler) {
+	public void setCompiler(Compiler compiler) {
 		this.compiler = compiler;
 	}
 
@@ -72,9 +73,10 @@ public class MustacheView extends AbstractTemplateView {
 	}
 
 	@Override
-	protected void renderMergedTemplateModel(Map<String, Object> model, HttpServletRequest request,
-			HttpServletResponse response) throws Exception {
-		Template template = createTemplate(getApplicationContext().getResource(this.getUrl()));
+	protected void renderMergedTemplateModel(Map<String, Object> model,
+			HttpServletRequest request, HttpServletResponse response) throws Exception {
+		Template template = createTemplate(
+				getApplicationContext().getResource(this.getUrl()));
 		if (template != null) {
 			template.execute(model, response.getWriter());
 		}
@@ -96,4 +98,5 @@ public class MustacheView extends AbstractTemplateView {
 		}
 		return new InputStreamReader(resource.getInputStream());
 	}
+
 }

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/mustache/servlet/MustacheViewResolver.java → spring-boot/src/main/java/org/springframework/boot/web/servlet/view/MustacheViewResolver.java

@@ -14,9 +14,10 @@
  * limitations under the License.
  */
 
-package org.springframework.boot.autoconfigure.mustache.servlet;
+package org.springframework.boot.web.servlet.view;
 
 import com.samskivert.mustache.Mustache;
+import com.samskivert.mustache.Mustache.Compiler;
 
 import org.springframework.web.servlet.ViewResolver;
 import org.springframework.web.servlet.view.AbstractTemplateViewResolver;
@@ -35,8 +36,8 @@ public class MustacheViewResolver extends AbstractTemplateViewResolver {
 	private String charset;
 
 	/**
-	 * Create a {@code MustacheViewResolver} backed by a default
-	 * instance of a {@link Mustache.Compiler}.
+	 * Create a {@code MustacheViewResolver} backed by a default instance of a
+	 * {@link Compiler}.
 	 */
 	public MustacheViewResolver() {
 		this.compiler = Mustache.compiler();
@@ -44,11 +45,11 @@ public class MustacheViewResolver extends AbstractTemplateViewResolver {
 	}
 
 	/**
-	 * Create a {@code MustacheViewResolver} backed by a custom
-	 * instance of a {@link Mustache.Compiler}.
+	 * Create a {@code MustacheViewResolver} backed by a custom instance of a
+	 * {@link Compiler}.
 	 * @param compiler the Mustache compiler used to compile templates
 	 */
-	public MustacheViewResolver(Mustache.Compiler compiler) {
+	public MustacheViewResolver(Compiler compiler) {
 		this.compiler = compiler;
 		setViewClass(requiredViewClass());
 	}

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/mustache/reactive/package-info.java → spring-boot/src/main/java/org/springframework/boot/web/servlet/view/package-info.java

@@ -15,6 +15,6 @@
  */
 
 /**
- * Auto-configuration for Mustache with Spring WebFlux.
+ * Additional {@link org.springframework.web.servlet.View Views} for use with Web MVC.
  */
-package org.springframework.boot.autoconfigure.mustache.reactive;
+package org.springframework.boot.web.servlet.view;

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mustache/reactive/MustacheViewResolverTests.java → spring-boot/src/test/java/org/springframework/boot/web/reactive/result/view/MustacheViewResolverTests.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.springframework.boot.autoconfigure.mustache.reactive;
+package org.springframework.boot.web.reactive.result.view;
 
 import org.junit.Before;
 import org.junit.Test;
@@ -24,12 +24,15 @@ import org.springframework.context.support.GenericApplicationContext;
 import static org.assertj.core.api.Assertions.assertThat;
 
 /**
- * Tests for {@link org.springframework.boot.autoconfigure.mustache.reactive.MustacheViewResolver}.
+ * Tests for {@link MustacheViewResolver}.
  *
  * @author Brian Clozel
  */
 public class MustacheViewResolverTests {
 
+	private final String prefix = "classpath:/"
+			+ getClass().getPackage().getName().replace(".", "/") + "/";
+
 	private MustacheViewResolver resolver = new MustacheViewResolver();
 
 	@Before
@@ -37,7 +40,7 @@ public class MustacheViewResolverTests {
 		GenericApplicationContext applicationContext = new GenericApplicationContext();
 		applicationContext.refresh();
 		this.resolver.setApplicationContext(applicationContext);
-		this.resolver.setPrefix("classpath:/mustache-templates/");
+		this.resolver.setPrefix(this.prefix);
 		this.resolver.setSuffix(".html");
 	}
 
@@ -48,7 +51,7 @@ public class MustacheViewResolverTests {
 
 	@Test
 	public void resolveExisting() throws Exception {
-		assertThat(this.resolver.resolveViewName("foo", null).block()).isNotNull();
+		assertThat(this.resolver.resolveViewName("template", null).block()).isNotNull();
 	}
 
 }

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mustache/reactive/MustacheViewTests.java → spring-boot/src/test/java/org/springframework/boot/web/reactive/result/view/MustacheViewTests.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.springframework.boot.autoconfigure.mustache.reactive;
+package org.springframework.boot.web.reactive.result.view;
 
 import java.nio.charset.StandardCharsets;
 import java.util.Collections;
@@ -37,6 +37,9 @@ import static org.assertj.core.api.Assertions.assertThat;
  */
 public class MustacheViewTests {
 
+	private final String templateUrl = "classpath:/"
+			+ getClass().getPackage().getName().replace(".", "/") + "/template.html";
+
 	private GenericApplicationContext context = new GenericApplicationContext();
 
 	private MockServerWebExchange exchange;
@@ -51,11 +54,13 @@ public class MustacheViewTests {
 		this.exchange = MockServerHttpRequest.get("/test").toExchange();
 		MustacheView view = new MustacheView();
 		view.setCompiler(Mustache.compiler());
-		view.setUrl("classpath:/mustache-templates/foo.html");
+		view.setUrl(this.templateUrl);
 		view.setCharset(StandardCharsets.UTF_8.displayName());
 		view.setApplicationContext(this.context);
-		view.render(Collections.singletonMap("World", "Spring"), MediaType.TEXT_HTML, this.exchange).block();
-		assertThat(this.exchange.getResponse().getBodyAsString().block()).isEqualTo("Hello Spring");
+		view.render(Collections.singletonMap("World", "Spring"), MediaType.TEXT_HTML,
+				this.exchange).block();
+		assertThat(this.exchange.getResponse().getBodyAsString().block())
+				.isEqualTo("Hello Spring");
 	}
 
 }

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mustache/servlet/MustacheViewResolverTests.java → spring-boot/src/test/java/org/springframework/boot/web/servlet/view/MustacheViewResolverTests.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.springframework.boot.autoconfigure.mustache.servlet;
+package org.springframework.boot.web.servlet.view;
 
 import org.junit.Before;
 import org.junit.Test;
@@ -33,6 +33,9 @@ import static org.assertj.core.api.Assertions.assertThat;
  */
 public class MustacheViewResolverTests {
 
+	private final String prefix = "classpath:/"
+			+ getClass().getPackage().getName().replace(".", "/") + "/";
+
 	private MustacheViewResolver resolver = new MustacheViewResolver();
 
 	@Before
@@ -41,7 +44,7 @@ public class MustacheViewResolverTests {
 		applicationContext.refresh();
 		this.resolver.setApplicationContext(applicationContext);
 		this.resolver.setServletContext(new MockServletContext());
-		this.resolver.setPrefix("classpath:/mustache-templates/");
+		this.resolver.setPrefix(this.prefix);
 		this.resolver.setSuffix(".html");
 	}
 
@@ -52,13 +55,13 @@ public class MustacheViewResolverTests {
 
 	@Test
 	public void resolveExisting() throws Exception {
-		assertThat(this.resolver.resolveViewName("foo", null)).isNotNull();
+		assertThat(this.resolver.resolveViewName("template", null)).isNotNull();
 	}
 
 	@Test
 	public void setsContentType() throws Exception {
 		this.resolver.setContentType("application/octet-stream");
-		View view = this.resolver.resolveViewName("foo", null);
+		View view = this.resolver.resolveViewName("template", null);
 		assertThat(view.getContentType()).isEqualTo("application/octet-stream");
 
 	}

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mustache/servlet/MustacheViewTests.java → spring-boot/src/test/java/org/springframework/boot/web/servlet/view/MustacheViewTests.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.springframework.boot.autoconfigure.mustache.servlet;
+package org.springframework.boot.web.servlet.view;
 
 import java.util.Collections;
 
@@ -37,6 +37,9 @@ import static org.assertj.core.api.Assertions.assertThat;
  */
 public class MustacheViewTests {
 
+	private final String templateUrl = "classpath:/"
+			+ getClass().getPackage().getName().replace(".", "/") + "/template.html";
+
 	private MockHttpServletRequest request = new MockHttpServletRequest();
 
 	private MockHttpServletResponse response = new MockHttpServletResponse();
@@ -57,9 +60,10 @@ public class MustacheViewTests {
 	public void viewResolvesHandlebars() throws Exception {
 		MustacheView view = new MustacheView();
 		view.setCompiler(Mustache.compiler());
-		view.setUrl("classpath:/mustache-templates/foo.html");
+		view.setUrl(this.templateUrl);
 		view.setApplicationContext(this.context);
-		view.render(Collections.singletonMap("World", "Spring"), this.request, this.response);
+		view.render(Collections.singletonMap("World", "Spring"), this.request,
+				this.response);
 		assertThat(this.response.getContentAsString()).isEqualTo("Hello Spring");
 	}
 

spring-boot/src/test/resources/org/springframework/boot/web/reactive/result/view/template.html

+Hello {{World}}
\ No newline at end of file

spring-boot/src/test/resources/org/springframework/boot/web/servlet/view/template.html

+Hello {{World}}
\ No newline at end of file