无法找到maven依赖？

Question

这是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>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>

我使用两个jar文件/javax.json-api-1.0-2.8.jar和javax.websocket-api-1.0.jar。 当我运行我的项目时，会发生以下异常

无法在项目白板上执行目标：无法解析项目org.sample的依赖项：whiteboard：war：1.0-SNAPSHOT：无法收集[javaee-api：javax：jar：7.0-b77（compile），javax.websocket的依赖项：javax.websocket-api：jar：1.0（编译），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：无法传输工件javaee-api：javax：pom：7.0-b77 from / to central（ http://repo.maven.apache.org/maven2 ）：repo.maven.apache.org：Unknown主机repo.maven.apache.org - > [帮助1]

Answer 1

在将其添加到pom.xml之前，请检查您要使用的jar的版本号，组ID和工件ID。 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>