Maven丢失工件但文件已就位- Eclipse

Question

在maven项目中，我得到了两个eclipse错误(2020-03)，

The container 'Maven Dependencies' references non existing library 'C:\Users\Shavindi\.m2\repository\javax\servlet\jsp\javax.servlet.jsp-api\4.0.1\javax.servlet.jsp-api-4.0.1.jar' ```

Missing artifact javax.servlet.jsp:javax.servlet.jsp-api:jar:4.0.1  pom.xml /ContactManager line 47 Maven Dependency Problem 

我遵循了这个问题的答案，Maven2: Missing artifact but jars are in place。但没起作用。

我的javax.servlet.jsp-api:jar:4.0.1文件已经就位了，如下所示。

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pom.xml文件也会被访问。

<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>net.codejava.contact</groupId>
  <artifactId>ContactManager</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>13</release>
        </configuration>
      </plugin>
      <plugin>
        <artifactId>maven-war-plugin</artifactId>
        <version>3.2.3</version>
        <configuration>
          <warSourceDirectory>WebContent</warSourceDirectory>
        </configuration>
      </plugin>
    </plugins>
  </build>

  <properties>
    <spring.version>5.9.1.RELEASE</spring.version>
  </properties>

  <dependencies>
    <dependency>
        <groupId>org.springframework</groupId> 
        <artifactId>spring-webmvc</artifactId> 
        <version>4.2.2.RELEASE</version> 
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId> 
        <artifactId>spring-orm</artifactId> 
        <version>4.2.2.RELEASE</version> 
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId> 
        <artifactId>javax.servlet-api</artifactId> 
        <version>4.0.1</version> 
    </dependency>
      <dependency>
        <groupId>javax.servlet.jsp</groupId> 
        <artifactId>javax.servlet.jsp-api</artifactId> 
        <version>4.0.1</version> 
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId> 
        <artifactId>jstl</artifactId> 
        <version>1.2</version> 
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.19</version>
    </dependency>
  </dependencies>
</project>

Answer 1

从javax.servlet.jsp-api中删除不必要的pom.xml依赖项。

<dependency>
        <groupId>javax.servlet.jsp</groupId> 
        <artifactId>javax.servlet.jsp-api</artifactId> 
        <version>4.0.1</version> 
</dependency>

另外，Project -> Clean是否检查错误是否仍然存在？如果是，则Right Click on project -> Maven -> Update Project -> Select update of snapshot并启用Project -> Build automatically。

此外，他们还移走了艺术品。如果稍后编写代码，则可以使用下面的依赖项。

<dependency>
    <groupId>javax.servlet.jsp</groupId>
    <artifactId>javax.servlet.jsp-api</artifactId>
    <version>2.3.1</version>
</dependency>

你的pom.xml不合适。所以，我也更新了你的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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>net.codejava.contact</groupId>
  <artifactId>ContactManager</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>13</release>
        </configuration>
      </plugin>
      <plugin>
        <artifactId>maven-war-plugin</artifactId>
        <version>3.2.3</version>
        <configuration>
          <warSourceDirectory>WebContent</warSourceDirectory>
        </configuration>
      </plugin>
    </plugins>
  </build>

  <properties>
    <spring.version>4.2.2.RELEASE</spring.version>
  </properties>

  <dependencies>
    <dependency>
        <groupId>org.springframework</groupId> 
        <artifactId>spring-webmvc</artifactId> 
        <version>${spring.version}</version> 
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId> 
        <artifactId>spring-orm</artifactId> 
        <version>${spring.version}</version> 
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId> 
        <artifactId>javax.servlet-api</artifactId> 
        <version>4.0.1</version> 
    </dependency>
    <dependency>
        <groupId>javax.servlet.jsp</groupId>
        <artifactId>javax.servlet.jsp-api</artifactId>
        <version>2.3.1</version>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId> 
        <artifactId>jstl</artifactId> 
        <version>1.2</version> 
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.19</version>
    </dependency>
  </dependencies>
</project>

Answer 2

我注意到您的POM.xml有错误的javax.servlet.jsp版本。试着用下面的最新版本来替换它。

<!-- https://mvnrepository.com/artifact/javax.servlet.jsp/javax.servlet.jsp-api -->
<dependency>
    <groupId>javax.servlet.jsp</groupId>
    <artifactId>javax.servlet.jsp-api</artifactId>
    <version>2.3.3</version>
    <scope>provided</scope>
</dependency>

如果该问题在发生更改后仍未得到解决，请按照下面提到的步骤进行，并查看是否有帮助。

• 右键单击Spring项目，选择Run作为-> Maven安装。观察输出控制台以查看安装进度。安装完成后，您可以继续下一步Project.
• Choose
• ，右键单击Spring项目，选择Maven -> Update
• 您的项目，然后单击OK。等待更新过程完成。Project->Build.

仍然是错误的

• ，然后执行Project->Clean，然后确定您已经选择了我们的项目目录，然后执行以下操作