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java - Struts 2 约定插件不起作用!如何让它运行？

转载 作者：行者123 更新时间：2023-12-02 10:07:46 24 4
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我尝试使用 official documentation 上的教程来使用 Struts 2 约定插件。但我无法让它运行。

这是我的配置方法:

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/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>Struts2Convention</groupId>
  <artifactId>Struts2Convention</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  <build>
    <sourceDirectory>src</sourceDirectory>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.8.0</version>
        <configuration>
          <release>9</release>
        </configuration>
      </plugin>
      <plugin>
        <artifactId>maven-war-plugin</artifactId>
        <version>3.2.1</version>
        <configuration>
          <warSourceDirectory>WebContent</warSourceDirectory>
        </configuration>
      </plugin>
    </plugins>
  </build>


  <dependencies>

  <dependency>
    <groupId>postgresql</groupId>
        <artifactId>postgresql</artifactId>
        <version>9.1-901-1.jdbc4</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.apache.struts/struts2-core -->
<dependency>
    <groupId>org.apache.struts</groupId>
    <artifactId>struts2-core</artifactId>
    <version>2.5.20</version>
</dependency>

<!-- https://mvnrepository.com/artifact/commons-logging/commons-logging -->
<dependency>
    <groupId>commons-logging</groupId>
    <artifactId>commons-logging</artifactId>
    <version>1.2</version>
</dependency>




    <!-- https://mvnrepository.com/artifact/commons-logging/commons-logging-api -->
<dependency>
    <groupId>commons-logging</groupId>
    <artifactId>commons-logging-api</artifactId>
    <version>1.1</version>
</dependency>



<!-- https://mvnrepository.com/artifact/org.apache.struts/struts2-convention-plugin -->
 <dependency>
    <groupId>org.apache.struts</groupId>
    <artifactId>struts2-convention-plugin</artifactId>
    <version>2.5.20</version>
</dependency> 

  </dependencies>
</project>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" id="WebApp_ID" version="4.0">
  <display-name>Struts2Convention</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>

  <filter>
  <filter-name>struts2</filter-name>
  <filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class>
  </filter>

  <filter-mapping>
   <filter-name>struts2</filter-name>
   <url-pattern>/*</url-pattern>
  </filter-mapping>


</web-app>

我按照教程 hello-world.jsp 创建了以下文件并且HelloWorld.java 这是操作类。

HelloWorld.java

package com.example.actions;

import org.apache.struts2.convention.annotation.Action;

import com.opensymphony.xwork2.ActionSupport;

    public class HelloWorld extends ActionSupport {
      private String message;

      public String getMessage() {
        return message;
      }

      public String execute() {
        message = "Hello World!";
        return SUCCESS;
      }
    }

hello-world.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
hello world!
</body>
</html>

根据文档，

First the Convention plugin finds packages named struts, struts2, action or actions. Any packages that match those names are considered the root packages for the Convention plugin. Next, the plugin looks at all of the classes in those packages as well as sub-packages and determines if the classes implement com.opensymphony.xwork2.Action or if their name ends with Action (i.e. FooAction).

我的设置如下

项目设置

project setup

运行 tomcat 时出现以下错误:

ERROR DefaultClassFinder Unable to read class [com.example.actions.HelloWorld]
 java.lang.IllegalArgumentException
    at org.objectweb.asm.ClassReader.<init>(Unknown Source)
    at org.objectweb.asm.ClassReader.<init>(Unknown Source)
    at org.objectweb.asm.ClassReader.<init>(Unknown Source)
    at org.apache.struts2.convention.DefaultClassFinder.readClassDef(DefaultClassFinder.java:461)
    at org.apache.struts2.convention.DefaultClassFinder.<init>(DefaultClassFinder.java:93)
    at org.apache.struts2.convention.PackageBasedActionConfigBuilder.buildClassFinder(PackageBasedActionConfigBuilder.java:395)
    at org.apache.struts2.convention.PackageBasedActionConfigBuilder.findActions(PackageBasedActionConfigBuilder.java:377)
    at org.apache.struts2.convention.PackageBasedActionConfigBuilder.buildActionConfigs(PackageBasedActionConfigBuilder.java:333)
    at org.apache.struts2.convention.ClasspathPackageProvider.loadPackages(ClasspathPackageProvider.java:52)
    at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:206)
    at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:66)
    at org.apache.struts2.dispatcher.Dispatcher.getContainer(Dispatcher.java:957)
    at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:463)
    at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:496)
    at org.apache.struts2.dispatcher.InitOperations.initDispatcher(InitOperations.java:73)
    at org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:61)
    at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:270)
    at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:251)
    at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:102)
    at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4516)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5162)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1377)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1367)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
    at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140)
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:902)
    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:831)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1377)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1367)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
    at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140)
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:902)
    at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.StandardService.startInternal(StandardService.java:423)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:928)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:638)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:350)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:492)

并且我的页面无法加载。我收到 HTTP 状态 404 错误。

我该如何解决这个问题？

最佳答案

我更改了 pom.xml 以排除 asm 5.2 并包含 asm 7.1 。这个link中提到了java 9,10,11 中存在导致此问题的错误。

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/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>Struts2Convention</groupId>
	<artifactId>Struts2Convention</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>war</packaging>
	<build>
		<sourceDirectory>src</sourceDirectory>
		<plugins>
			<plugin>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.8.0</version>
				<configuration>
					<release>9</release>
				</configuration>
			</plugin>
			<plugin>
				<artifactId>maven-war-plugin</artifactId>
				<version>3.2.1</version>
				<configuration>
					<warSourceDirectory>WebContent</warSourceDirectory>
				</configuration>
			</plugin>
		</plugins>
		<resources>
     <resource>
       <directory>src</directory>
     </resource>
   </resources>
	</build>


	<dependencies>

		<dependency>
			<groupId>postgresql</groupId>
			<artifactId>postgresql</artifactId>
			<version>9.1-901-1.jdbc4</version>
		</dependency>

		<!-- https://mvnrepository.com/artifact/org.apache.struts/struts2-core -->
		<dependency>
			<groupId>org.apache.struts</groupId>
			<artifactId>struts2-core</artifactId>
			<version>2.5.20</version>
		</dependency>

		<!-- https://mvnrepository.com/artifact/commons-logging/commons-logging -->
		<dependency>
			<groupId>commons-logging</groupId>
			<artifactId>commons-logging</artifactId>
			<version>1.2</version>
		</dependency>




		<!-- https://mvnrepository.com/artifact/commons-logging/commons-logging-api -->
		<dependency>
			<groupId>commons-logging</groupId>
			<artifactId>commons-logging-api</artifactId>
			<version>1.1</version>
		</dependency>



		<!-- https://mvnrepository.com/artifact/org.apache.struts/struts2-convention-plugin -->
		<dependency>
			<groupId>org.apache.struts</groupId>
			<artifactId>struts2-convention-plugin</artifactId>
			<version>2.5.20</version>
			<exclusions>
				<exclusion>
					<groupId>org.ow2.asm</groupId>
					<artifactId>asm-tree</artifactId>
				</exclusion>
				<exclusion>
					<groupId>org.ow2.asm</groupId>
					<artifactId>asm-commons</artifactId>
				</exclusion>
				<exclusion>
					<groupId>org.ow2.asm</groupId>
					<artifactId>asm</artifactId>
				</exclusion>
			</exclusions>
		</dependency>
        
        <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core -->
<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-core</artifactId>
    <version>2.11.2</version>
</dependency>


        
        
		<!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core -->
	

		<dependency>
			<groupId>org.ow2.asm</groupId>
			<artifactId>asm</artifactId>
			<version>7.1</version>
		</dependency>


		<!-- https://mvnrepository.com/artifact/org.ow2.asm/asm-tree -->
		<dependency>
			<groupId>org.ow2.asm</groupId>
			<artifactId>asm-tree</artifactId>
			<version>7.1</version>
		</dependency>


		<!-- https://mvnrepository.com/artifact/org.ow2.asm/asm-commons -->
		<dependency>
			<groupId>org.ow2.asm</groupId>
			<artifactId>asm-commons</artifactId>
			<version>7.1</version>
		</dependency>

	</dependencies>
</project>

关于java - Struts 2 约定插件不起作用!如何让它运行？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/55219223/

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