无法找到Maven依赖？

Question

这里是我使用的两个jar文件/javax.json-api-1.0-2.8.jar和javax.websocket-API-1.0.jar pom.xml中

 <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>org.sample</groupId> 
    <artifactId>whiteboard</artifactId> 
    <version>1.0-SNAPSHOT</version> 
    <packaging>war</packaging> 

    <name>whiteboard</name> 

    <properties> 
    <endorsed.dir>${project.build.directory}/endorsed</endorsed.dir> 
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 
    <netbeans.hint.deploy.server>gfv3ee6</netbeans.hint.deploy.server> 
    </properties> 

    <repositories> 
    <repository> 
     <id>java.net-promoted</id> 
     <url>https://maven.java.net/content/groups/promoted/</url> 
    </repository> 
    </repositories> 


    <build> 
    <finalName>whiteboard</finalName> 
    <plugins> 
     <plugin> 
      <groupId>org.apache.maven.plugins</groupId> 
      <artifactId>maven-compiler-plugin</artifactId> 
      <version>3.1</version> 
      <configuration> 
       <source>1.7</source> 
       <target>1.7</target> 
      </configuration> 
     </plugin> 
     <plugin> 
      <groupId>org.apache.maven.plugins</groupId> 
      <artifactId>maven-war-plugin</artifactId> 
      <version>2.1.1</version> 
      <configuration> 
       <failOnMissingWebXml>false</failOnMissingWebXml> 
      </configuration> 
     </plugin> 
     </plugins> 
    </build> 
    <dependencies> 
    <dependency> 
     <groupId>javax.websocket</groupId> 
     <artifactId>javax.websocket-api</artifactId> 
     <version>1.0</version> 
     <type>jar</type> 
    </dependency> 
     <dependency> 
     <groupId>javax.json-api-1.0</groupId> 
     <artifactId>javax.json-api-1.0</artifactId> 
     <version>2.8</version> 
     <type>jar</type> 
    </dependency> 
    <dependency> 
     <groupId>org.apache.maven.plugins</groupId> 
     <artifactId>maven-compiler-plugin</artifactId> 
     <version>3.1</version> 
    </dependency> 
    </dependencies> 
    </project> 

。 当我跑我的项目会出现以下异常

未能就项目执行白板目标：无法解析项目org.sample依赖关系：白板：战争：1.0快照：无法收集依赖关系[javaee- api：javax：jar：7.0-b77（compile），javax.websocket：javax.websocket-api：jar：1.0（compile），javax.json-api-1.0：javax.json-api-1.0：jar：2.8编译）]：无法读取javaee-api的工件描述符：javax：jar：7.0-b77：无法将工件javaee-api：javax：pom：7.0-b77从/传输到中心（http://repo.maven.apache.org/maven2）：repo.maven.apache .org：未知主机repo.maven.apache.org - > [Help 1]

Answer 1

在将它添加到pom.xml之前，请检查您要使用的jar版本号，组标识和工件标识。它将作为该jar的元数据xml的一部分。 http://search.maven.org/remotecontent?filepath=javax/json/javax.json-api/maven-metadata.xml

<dependency> 
    <groupId>javax.json</groupId> 
    <artifactId>javax.json-api</artifactId> 
     <version>1.0</version> 
     <type>jar</type> 
    </dependency>