java 如何调试在 spring mvc rest 中找不到的 404 资源?
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How to debug 404 resource not found in spring mvc rest?
提问by diwakarb
I have a sample spring rest mvc application which has the following java code:
我有一个示例 spring rest mvc 应用程序,它具有以下 java 代码:
SampleController.java
示例控制器.java
import org.apache.logging.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("sample")
public class SampleController {
@RequestMapping(method = RequestMethod.GET, produces = "application/json")
@ResponseBody
public String getBatches()//@RequestParam(name = "name", required = true) String name)
{
return "Hello ";
}
}
pom.xml
pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>ved</groupId>
<artifactId>platform</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>platform Maven Webapp</name>
<url>http://maven.apache.org</url>
<properties>
<spring.version>4.2.1.RELEASE</spring.version>
<Hymanson.version>2.6.2</Hymanson.version>
<spring-boot.version>1.2.6.RELEASE</spring-boot.version>
<filter.name>DEV</filter.name>
<jersey.version>1.9</jersey.version>
<base.directory>${basedir}</base.directory>
</properties>
<profiles>
<profile>
<id>local</id>
<activation>
<property>
<name>env</name>
<value>local</value>
</property>
</activation>
<properties>
<filter.name>DEV</filter.name>
</properties>
</profile>
<profile>
<id>qa</id>
<activation>
<property>
<name>env</name>
<value>qa</value>
</property>
</activation>
<properties>
<filter.name>QA</filter.name>
</properties>
</profile>
<profile>
<id>prod</id>
<activation>
<property>
<name>env</name>
<value>prod</value>
</property>
</activation>
<properties>
<filter.name>PROD</filter.name>
</properties>
</profile>
</profiles>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.Hymanson.core</groupId>
<artifactId>Hymanson-databind</artifactId>
<version>${Hymanson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.Hymanson.core</groupId>
<artifactId>Hymanson-core</artifactId>
<version>${Hymanson.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-mongodb</artifactId>
<version>1.8.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>2.3</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.3</version>
</dependency>
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-core</artifactId>
<version>${jersey.version}</version>
</dependency>
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-client</artifactId>
<version>${jersey.version}</version>
</dependency>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.2.4</version>
</dependency>
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-server</artifactId>
<version>${jersey.version}</version>
</dependency>
</dependencies>
<build>
<!-- <filters> <filter>${basedir}/src/main/resources/ENV-${filter.name}/application.properties</filter>
</filters> -->
<finalName>platform</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<debug>true</debug>
<debuglevel>source,lines</debuglevel>
<showDeprecation>true</showDeprecation>
<archive>
</archive>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.5</version>
<configuration>
<systemPropertyVariables>
<environment>prod</environment>
</systemPropertyVariables>
</configuration>
</plugin>
<plugin>
<groupId>com.google.code.maven-svn-revision-number-plugin</groupId>
<artifactId>maven-svn-revision-number-plugin</artifactId>
<version>1.7</version>
<executions>
<execution>
<goals>
<goal>revision</goal>
</goals>
</execution>
</executions>
<configuration>
<entries>
<entry>
<prefix>svn</prefix>
</entry>
</entries>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>buildnumber-maven-plugin</artifactId>
<version>1.0</version>
<executions>
<execution>
<id>generate-timestamp</id>
<phase>validate</phase>
<goals>
<goal>create-timestamp</goal>
</goals>
</execution>
</executions>
<configuration>
<format>{0,date,yyyy-MM-dd HH:mm}</format>
<items>
<item>timestamp</item>
</items>
</configuration>
</plugin>
</plugins>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
</build>
</project>
web.xml
网页.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
id="WebApp_ID" version="3.0">
<display-name>Archetype Created Web Application</display-name>
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/dispatcher-servlet.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
dispatcher-servlet.xml
调度程序-servlet.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:beans="http://www.springframework.org/schema/beans"
xmlns:util="http://www.springframework.org/schema/util" xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mongo="http://www.springframework.org/schema/data/mongo"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd
http://www.springframework.org/schema/data/mongo
http://www.springframework.org/schema/data/mongo/spring-mongo-1.0.xsd">
<!-- <context:property-placeholder location="classpath:application.properties"
/> -->
<context:annotation-config />
<context:component-scan base-package="com.ved.platform" />
<bean id="HymansonMessageConverter"
class="org.springframework.http.converter.json.MappingHymanson2HttpMessageConverter" />
<bean
class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<ref bean="HymansonMessageConverter" />
</list>
</property>
</bean>
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/WEB-INF/views/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
<!-- <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters"> <list> <bean class="org.springframework.http.converter.json.MappingHymansonHttpMessageConverter">
</bean> </list> </property> </bean> -->
<mvc:resources mapping="/resources/**" location="/resources/" />
<mvc:annotation-driven />
</beans>
homepage is giving me the apache page, but once I try to access 127.0.0.1:8080/sample It throws me a 404 error. Logs are all silent about it. Not sure how to fix this.
主页给了我 apache 页面,但是一旦我尝试访问 127.0.0.1:8080/sample 它就会抛出 404 错误。日志都对此保持沉默。不知道如何解决这个问题。
回答by Omkar
You have to add the context path
in the url - localhost:8080/<context-path>/sample
.
Typically Context path
would be your war
file name if you deploy the app on Tomcat
. If your war
file name is helloworld.war
, then the URL would be localhost:8080/helloworld/sample
.
您必须context path
在网址中添加- localhost:8080/<context-path>/sample
。通常Context path
是你的war
文件名,如果你部署的应用程序Tomcat
。如果您的war
文件名是helloworld.war
,那么 URL 就是localhost:8080/helloworld/sample
.
If you are using Tomcat
configured in Eclipse
, you can set the context-path
in the Modules tab.
如果您使用的是在 中Tomcat
配置Eclipse
,则可以context-path
在模块选项卡中进行设置。
Ways to Deploy your application to Tomcat
root -
将应用程序部署到Tomcat
root 的方法 -
You can do it by simply naming the
war
file asROOT.war
In
ROOT.xml
file, you have to specify this configuration<Context docBase="pathToWarFile" path="" reloadable="true" />
and make sure that yourwar
file is not inwebapps
folder.
您可以通过简单地将
war
文件命名为ROOT.war
在
ROOT.xml
文件中,您必须指定此配置<Context docBase="pathToWarFile" path="" reloadable="true" />
并确保您的war
文件不在webapps
文件夹中。
If you deploy the application to the tomcat root, then there is no need to specify the context path
. You will get the homepage of your app with the url localhost:8080/
. In your case, you can call the controller method with the url localhost:8080/sample
.
如果将应用程序部署到 tomcat 根目录,则无需指定context path
. 您将通过 url 获得应用程序的主页localhost:8080/
。在您的情况下,您可以使用 url 调用控制器方法localhost:8080/sample
。
回答by Grim
If you have "SLF4J: Defaulting to no-operation (NOP) logger implementation" message:
如果您有“SLF4J:默认为无操作(NOP)记录器实现”消息:
Add a dependency to simple-logger like this:
像这样向 simple-logger 添加依赖项:
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-simple</artifactId>
<version>1.7.5</version>
</dependency>
Otherwise
否则
It needs reverse search.
它需要反向搜索。
- Find what message you like to see. This articlegives me the hint that i need the message
No mapping found for HTTP request with
. - Search for sources in the web like this.
And here we have the line:
在这里,我们有一行:
if (pageNotFoundLogger.isWarnEnabled()) {
pageNotFoundLogger.warn("No mapping found for HTTP request with URI [" + getRequestUri(request) +
"] in DispatcherServlet with name '" + getServletName() + "'");
}
- Finally lookup for the class and add the logging-level.
- 最后查找该类并添加日志记录级别。
回答by gary69
Make sure you're scanning the packages your controllers are in. Otherwise spring won't create beans for your controllers and the paths they're listening for will return a 404.
确保您正在扫描控制器所在的包。否则 spring 不会为您的控制器创建 bean,并且它们正在侦听的路径将返回 404。
回答by isobretatel
Place a breakpoint in
放置一个断点
org.springframework.web.servlet.mvc.condition.PatternsRequestCondition.getMatchingPattern(String pattern, String lookupPath).
org.springframework.web.servlet.mvc.condition.PatternsRequestCondition.getMatchingPattern(字符串模式,字符串查找路径)。
You will see why there is no match for your request.
您将看到为什么没有匹配您的请求。
回答by asg
First thing is your request mapping should be - @RequestMapping("/sample") and not @RequestMapping("sample")
首先是你的请求映射应该是 - @RequestMapping("/sample") 而不是 @RequestMapping("sample")
回答by Mohit
Your servlet URL mapping is incorrect. It should be /* instead of /.
您的 servlet URL 映射不正确。它应该是 /* 而不是 /。
Take a look at this SO question for difference. Difference between / and /* in servlet mapping url pattern
看看这个 SO question 的不同之处。 servlet 映射 url 模式中 / 和 /* 之间的区别