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Add default /error view for HTML clients

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* Add integration tests for /error view
* Add "error" @Bean as default view for HTML

Users may see side effects because now there will be
a ContentNegotiatingViewResolver by default for the
first time in a vanilla Actuator app. Should be
interesting.

[Fixes #54597932] [bs-273] Circular view reference for /error
pull/15/merge
Dave Syer 11 years ago
parent 62f08bb4ec
commit 521174754e
4 changed files with 265 additions and 0 deletions
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73
spring-boot-actuator/src/main/java/org/springframework/boot/actuate/autoconfigure/ErrorMvcAutoConfiguration.java
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@ -16,19 +16,33 @@
package org.springframework.boot.actuate.autoconfigure;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.Servlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.actuate.web.BasicErrorController;
import org.springframework.boot.actuate.web.ErrorController;
import org.springframework.boot.autoconfigure.AutoConfigureBefore;
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.web.WebMvcAutoConfiguration;
import org.springframework.boot.context.embedded.ConfigurableEmbeddedServletContainerFactory;
import org.springframework.boot.context.embedded.EmbeddedServletContainerCustomizer;
import org.springframework.boot.context.embedded.ErrorPage;
import org.springframework.context.annotation.Bean;
import org.springframework.context.expression.MapAccessor;
import org.springframework.expression.Expression;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.expression.spel.support.StandardEvaluationContext;
import org.springframework.util.PropertyPlaceholderHelper;
import org.springframework.util.PropertyPlaceholderHelper.PlaceholderResolver;
import org.springframework.web.servlet.DispatcherServlet;
import org.springframework.web.servlet.View;
/**
* {@link EnableAutoConfiguration Auto-configuration} to render errors via a MVC error
@ -37,6 +51,9 @@ import org.springframework.web.servlet.DispatcherServlet;
* @author Dave Syer
*/
@ConditionalOnClass({ Servlet.class, DispatcherServlet.class })
// Ensure this loads before the main WebMvcAutoConfiguration so that the error View is
// available
@AutoConfigureBefore(WebMvcAutoConfiguration.class)
public class ErrorMvcAutoConfiguration implements EmbeddedServletContainerCustomizer {
@Value("${error.path:/error}")
@ -53,4 +70,60 @@ public class ErrorMvcAutoConfiguration implements EmbeddedServletContainerCustom
factory.addErrorPages(new ErrorPage(this.errorPath));
}
private SpelView defaultErrorView = new SpelView(
"<html><body><h1>Whitelabel Error Page</h1>"
+ "<p>This application has no explicit mapping for /error, so you are seeing this as a fallback.</p>"
+ "<div id='created'>${timestamp}</div>"
+ "<div>There was an unexpected error (type=${error}, status=${status}).</div>"
+ "<div>${message}</div>" + "</body></html>");
@Bean(name = "error")
@ConditionalOnMissingBean(name = "error")
public View defaultErrorView() {
return this.defaultErrorView;
}
private static class SpelView implements View {
private final String template;
private final SpelExpressionParser parser = new SpelExpressionParser();
private final StandardEvaluationContext context = new StandardEvaluationContext();
private PropertyPlaceholderHelper helper;
private PlaceholderResolver resolver;
public SpelView(String template) {
this.template = template;
this.context.addPropertyAccessor(new MapAccessor());
this.helper = new PropertyPlaceholderHelper("${", "}");
this.resolver = new PlaceholderResolver() {
public String resolvePlaceholder(String name) {
Expression expression = SpelView.this.parser.parseExpression(name);
Object value = expression.getValue(SpelView.this.context);
return value == null ? null : value.toString();
}
};
}
public String getContentType() {
return "text/html";
}
public void render(Map<String, ?> model, HttpServletRequest request,
HttpServletResponse response) throws Exception {
if (response.getContentType() == null) {
response.setContentType(getContentType());
}
Map<String, Object> map = new HashMap<String, Object>(model);
map.put("path", request.getContextPath());
this.context.setRootObject(map);
String result = this.helper.replacePlaceholders(this.template, this.resolver);
response.getWriter().append(result);
}
}
}

107
spring-boot-actuator/src/test/java/org/springframework/boot/actuate/web/BasicErrorControllerIntegrationTests.java
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@ -0,0 +1,107 @@
/*
* Copyright 2012-2013 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.web;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.actuate.web.BasicErrorControllerIntegrationTests.TestConfiguration;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.context.initializer.LoggingApplicationContextInitializer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.context.web.WebAppConfiguration;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.MvcResult;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.servlet.View;
import org.springframework.web.servlet.view.AbstractView;
import static org.junit.Assert.assertTrue;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
/**
* @author Dave Syer
*/
@ContextConfiguration(classes = TestConfiguration.class, initializers = { LoggingApplicationContextInitializer.class })
@RunWith(SpringJUnit4ClassRunner.class)
@WebAppConfiguration
public class BasicErrorControllerIntegrationTests {
@Autowired
private WebApplicationContext wac;
private MockMvc mockMvc;
@Before
public void setup() {
this.mockMvc = MockMvcBuilders.webAppContextSetup(this.wac).build();
}
@Test
public void testErrorForMachineClient() throws Exception {
MvcResult response = this.mockMvc.perform(get("/error"))
.andExpect(status().isOk()).andReturn();
String content = response.getResponse().getContentAsString();
assertTrue("Wrong content: " + content, content.contains("999"));
}
@Test
public void testErrorForBrowserClient() throws Exception {
MvcResult response = this.mockMvc
.perform(get("/error").accept(MediaType.TEXT_HTML))
.andExpect(status().isOk()).andReturn();
String content = response.getResponse().getContentAsString();
assertTrue("Wrong content: " + content, content.contains("ERROR_BEAN"));
}
@Configuration
@EnableAutoConfiguration
public static class TestConfiguration {
// For manual testing
public static void main(String[] args) {
SpringApplication.run(TestConfiguration.class, args);
}
@Bean
public View error() {
return new AbstractView() {
@Override
protected void renderMergedOutputModel(Map<String, Object> model,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
response.getWriter().write("ERROR_BEAN");
}
};
}
}
}

80
spring-boot-actuator/src/test/java/org/springframework/boot/actuate/web/DefaultErrorViewIntegrationTests.java
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@ -0,0 +1,80 @@
/*
* Copyright 2012-2013 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.web;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.actuate.web.DefaultErrorViewIntegrationTests.TestConfiguration;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.context.initializer.LoggingApplicationContextInitializer;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.context.web.WebAppConfiguration;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.MvcResult;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;
import org.springframework.web.context.WebApplicationContext;
import static org.junit.Assert.assertTrue;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
/**
* @author Dave Syer
*/
@ContextConfiguration(classes = TestConfiguration.class, initializers = { LoggingApplicationContextInitializer.class })
@RunWith(SpringJUnit4ClassRunner.class)
@WebAppConfiguration
public class DefaultErrorViewIntegrationTests {
@Autowired
private WebApplicationContext wac;
private MockMvc mockMvc;
@Before
public void setup() {
this.mockMvc = MockMvcBuilders.webAppContextSetup(this.wac).build();
}
@Test
public void testErrorForBrowserClient() throws Exception {
MvcResult response = this.mockMvc
.perform(get("/error").accept(MediaType.TEXT_HTML))
.andExpect(status().isOk()).andReturn();
String content = response.getResponse().getContentAsString();
assertTrue("Wrong content: " + content, content.contains("<html>"));
assertTrue("Wrong content: " + content, content.contains("999"));
}
@Configuration
@EnableAutoConfiguration
public static class TestConfiguration {
// For manual testing
public static void main(String[] args) {
SpringApplication.run(TestConfiguration.class, args);
}
}
}

5
spring-boot-samples/spring-boot-sample-actuator-ui/src/main/java/org/springframework/boot/sample/ops/ui/SampleActuatorUiApplication.java
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@ -40,6 +40,11 @@ public class SampleActuatorUiApplication {
return "home";
}
@RequestMapping("/foo")
public String foo() {
throw new RuntimeException("Expected exception in controller");
}
public static void main(String[] args) throws Exception {
SpringApplication.run(SampleActuatorUiApplication.class, args);
}

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