Cope with null server or management port when creating curie provider

Previously, a NullPointerException would occur if
endpoints.docs.curies.enabled was true and the default value was being
used for either server.port or management.port.

EndpointWebMvcHypermediaManagementContextConfiguration has been
restructured to ensure that the DocsMvcEndpoint bean is defined before
the condition on its existence is evaluated. Previously this was
dependant on the class’s bean methods being processed in a particular
ordering, something that would be ok when using ASM but would vary when
using reflection.

Closes gh-6584

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/autoconfigure/EndpointWebMvcHypermediaManagementContextConfiguration.java

@@ -54,6 +54,7 @@ import org.springframework.boot.autoconfigure.web.ServerProperties;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Conditional;
+import org.springframework.context.annotation.Configuration;
 import org.springframework.core.MethodParameter;
 import org.springframework.core.annotation.AnnotationUtils;
 import org.springframework.core.io.ResourceLoader;
@@ -117,14 +118,6 @@ public class EndpointWebMvcHypermediaManagementContextConfiguration {
 		return new HalJsonMvcEndpoint(managementServletContext);
 	}
 
-	@Bean
-	@ConditionalOnEnabledEndpoint("docs")
-	@ConditionalOnResource(resources = "classpath:/META-INF/resources/spring-boot-actuator/docs/index.html")
-	public DocsMvcEndpoint docsMvcEndpoint(
-			ManagementServletContext managementServletContext) {
-		return new DocsMvcEndpoint(managementServletContext);
-	}
-
 	@Bean
 	@ConditionalOnBean(DocsMvcEndpoint.class)
 	@ConditionalOnMissingBean(CurieProvider.class)
@@ -133,12 +126,33 @@ public class EndpointWebMvcHypermediaManagementContextConfiguration {
 			ManagementServerProperties management, DocsMvcEndpoint endpoint) {
 		String path = management.getContextPath() + endpoint.getPath()
 				+ "/#spring_boot_actuator__{rel}";
-		if (server.getPort().equals(management.getPort()) && management.getPort() != 0) {
+		if (serverAndManagementPortsAreTheSame(server, management)) {
 			path = server.getPath(path);
 		}
 		return new DefaultCurieProvider("boot", new UriTemplate(path));
 	}
 
+	private boolean serverAndManagementPortsAreTheSame(ServerProperties server,
+			ManagementServerProperties management) {
+		if (server.getPort() == null) {
+			return management.getPort() == null;
+		}
+		return server.getPort().equals(management.getPort()) && management.getPort() != 0;
+	}
+
+	@Configuration
+	static class DocsMvcEndpointConfiguration {
+
+		@Bean
+		@ConditionalOnEnabledEndpoint("docs")
+		@ConditionalOnResource(resources = "classpath:/META-INF/resources/spring-boot-actuator/docs/index.html")
+		public DocsMvcEndpoint docsMvcEndpoint(
+				ManagementServletContext managementServletContext) {
+			return new DocsMvcEndpoint(managementServletContext);
+		}
+
+	}
+
 	/**
 	 * Controller advice that adds links to the actuator endpoint's path.
 	 */

spring-boot-actuator/src/test/java/org/springframework/boot/actuate/autoconfigure/EndpointWebMvcHypermediaManagementContextConfigurationTests.java

@@ -0,0 +1,140 @@
+/*
+ * Copyright 2012-2016 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.actuate.autoconfigure;
+
+import java.net.URL;
+
+import org.junit.After;
+import org.junit.Test;
+
+import org.springframework.boot.actuate.endpoint.mvc.DocsMvcEndpoint;
+import org.springframework.boot.actuate.endpoint.mvc.HalJsonMvcEndpoint;
+import org.springframework.boot.actuate.endpoint.mvc.ManagementServletContext;
+import org.springframework.boot.actuate.endpoint.mvc.MvcEndpoints;
+import org.springframework.boot.autoconfigure.web.HttpMessageConvertersAutoConfiguration;
+import org.springframework.boot.autoconfigure.web.ServerProperties;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.boot.test.EnvironmentTestUtils;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.hateoas.Link;
+import org.springframework.hateoas.hal.DefaultCurieProvider;
+import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.is;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Tests for {@link EndpointWebMvcHypermediaManagementContextConfigurationTests}.
+ *
+ * @author Andy Wilkinson
+ */
+public class EndpointWebMvcHypermediaManagementContextConfigurationTests {
+
+	private AnnotationConfigWebApplicationContext context;
+
+	@After
+	public void closeContext() {
+		this.context.close();
+	}
+
+	@Test
+	public void basicConfiguration() {
+		load();
+		assertThat(this.context.getBeansOfType(ManagementServletContext.class).size(),
+				is(equalTo(1)));
+		assertThat(this.context.getBeansOfType(HalJsonMvcEndpoint.class).size(),
+				is(equalTo(1)));
+		assertThat(this.context.getBeansOfType(DocsMvcEndpoint.class).size(),
+				is(equalTo(1)));
+		assertThat(this.context.getBeansOfType(DefaultCurieProvider.class).size(),
+				is(equalTo(0)));
+	}
+
+	@Test
+	public void curiesEnabledWithDefaultPorts() {
+		load("endpoints.docs.curies.enabled:true");
+		assertThat(getCurieHref(), is(equalTo("/docs/#spring_boot_actuator__{rel}")));
+	}
+
+	@Test
+	public void curiesEnabledWithRandomPorts() {
+		load("endpoints.docs.curies.enabled:true", "server.port:0", "management.port:0");
+		assertThat(getCurieHref(), is(equalTo("/docs/#spring_boot_actuator__{rel}")));
+	}
+
+	@Test
+	public void curiesEnabledWithSpecificServerPort() {
+		load("endpoints.docs.curies.enabled:true", "server.port:8080");
+		assertThat(getCurieHref(), is(equalTo("/docs/#spring_boot_actuator__{rel}")));
+	}
+
+	@Test
+	public void curiesEnabledWithSpecificManagementPort() {
+		load("endpoints.docs.curies.enabled:true", "management.port:8081");
+		assertThat(getCurieHref(), is(equalTo("/docs/#spring_boot_actuator__{rel}")));
+	}
+
+	@Test
+	public void curiesEnabledWithSpecificManagementAndServerPorts() {
+		load("endpoints.docs.curies.enabled:true", "server.port:8080",
+				"management.port:8081");
+		assertThat(getCurieHref(), is(equalTo("/docs/#spring_boot_actuator__{rel}")));
+	}
+
+	private void load(String... properties) {
+		this.context = new AnnotationConfigWebApplicationContext();
+		this.context.setClassLoader(new ClassLoader(getClass().getClassLoader()) {
+
+			@Override
+			public URL getResource(String name) {
+				if ("META-INF/resources/spring-boot-actuator/docs/index.html"
+						.equals(name)) {
+					return super.getResource("actuator-docs-index.html");
+				}
+				return super.getResource(name);
+			}
+
+		});
+		EnvironmentTestUtils.addEnvironment(this.context, properties);
+		this.context.register(TestConfiguration.class,
+				HttpMessageConvertersAutoConfiguration.class,
+				EndpointWebMvcHypermediaManagementContextConfiguration.class);
+		this.context.refresh();
+	}
+
+	private String getCurieHref() {
+		DefaultCurieProvider curieProvider = this.context
+				.getBean(DefaultCurieProvider.class);
+		Link link = (Link) curieProvider.getCurieInformation(null).iterator().next();
+		return link.getHref();
+	}
+
+	@Configuration
+	@EnableConfigurationProperties({ ManagementServerProperties.class,
+			ServerProperties.class })
+	static class TestConfiguration {
+
+		@Bean
+		public MvcEndpoints mvcEndpoints() {
+			return new MvcEndpoints();
+		}
+
+	}
+
+}