如图，idea运行问题，如何解决

Question

想问下图里运行后出现这样是怎么回事？该怎么解决？有知道的吗？感谢解答！

Answer 1

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• 这篇博客你也可以参考下：春眠不觉晓，IDEA的快捷键你知多少？（IDEA快捷键大全、快捷键提示插件、快捷键新手插件）
• 除此之外, 这篇博客: idea找不到或无法加载主类中的 浪费了我好长时间查找错误源头，百度终无果，最终解决办法： 部分也许能够解决你的问题, 你可以仔细阅读以下内容或跳转源博客中阅读:
  

  1.Mark Directory as 给予scala一个Source root（变成蓝色的）
  2.修改pom.xml配置文件

  <?xml version="1.0" encoding="UTF-8"?>
  <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>com.etc</groupId>
      <artifactId>spark-sql</artifactId>
      <version>1.0-SNAPSHOT</version>
  
      <properties>
          <scala.version>2.10.6</scala.version>
          <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
      </properties>
  
      <dependencies>
          <!-- 导入scala的依赖 -->
          <dependency>
            <groupId>org.scala-lang</groupId>
            <artifactId>scala-library</artifactId>
            <version>${scala.version}</version>
        </dependency>
  
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
  
        <dependency>
            <groupId>org.apache.spark</groupId>
            <artifactId>spark-core_2.10</artifactId>
            <version>1.5.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.spark</groupId>
            <artifactId>spark-sql_2.10</artifactId>
            <version>1.5.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.spark</groupId>
            <artifactId>spark-hive_2.10</artifactId>
            <version>1.5.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.spark</groupId>
            <artifactId>spark-streaming_2.10</artifactId>
            <version>1.5.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-client</artifactId>
            <version>2.4.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.spark</groupId>
            <artifactId>spark-streaming-kafka_2.10</artifactId>
            <version>1.5.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.spark</groupId>
            <artifactId>spark-streaming-flume_2.10</artifactId>
            <version>1.5.1</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.11</version>
        </dependency>
        <dependency>
            <groupId>org.apache.hive</groupId>
            <artifactId>hive-jdbc</artifactId>
            <version>0.13.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.4.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpcore</artifactId>
            <version>4.4.1</version>
        </dependency>
      </dependencies>
  
      <build>
        <sourceDirectory>src/main/java</sourceDirectory>
        <testSourceDirectory>src/main/</testSourceDirectory>
  
        <plugins>
          <plugin>
          <artifactId>maven-assembly-plugin</artifactId>
          <configuration>
              <descriptorRefs>
                  <descriptorRef>jar-with-dependencies</descriptorRef>
              </descriptorRefs>
              <archive>
                  <manifest>
                      <mainClass></mainClass>
                  </manifest>
              </archive>
          </configuration>
          <executions>
              <execution>
                  <id>make-assembly</id>
                  <phase>package</phase>
                  <goals>
                      <goal>single</goal>
                  </goals>
              </execution>
          </executions>
      </plugin>
  
      <plugin>
          <groupId>org.codehaus.mojo</groupId>
          <artifactId>exec-maven-plugin</artifactId>
          <version>1.2.1</version>
          <executions>
              <execution>
                  <goals>
                      <goal>exec</goal>
                  </goals>
              </execution>
          </executions>
          <configuration>
              <executable>java</executable>
              <includeProjectDependencies>true</includeProjectDependencies>
              <includePluginDependencies>false</includePluginDependencies>
              <classpathScope>compile</classpathScope>
              <mainClass>cn.spark.study.App</mainClass>
          </configuration>
      </plugin>
  
      <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-compiler-plugin</artifactId>
          <configuration>
              <source>1.6</source>
              <target>1.6</target>
          </configuration>
      </plugin>
  
  
      <!--scala插件-->
          <plugin>
            <groupId>net.alchim31.maven</groupId>
            <artifactId>scala-maven-plugin</artifactId>
            <version>3.2.2</version>
            <executions>
                <execution>
                    <goals>
                        <goal>compile</goal>
                        <goal>testCompile</goal>
                    </goals>
                    <configuration>
                        <args>                                <!--<arg>-make:transitive</arg>--><!--scala2.11 netbean不支持这个参数-->
                            <arg>-dependencyfile</arg>
                            <arg>${project.build.directory}/.scala_dependencies</arg>
                        </args>
                    </configuration>
                  </execution>
              </executions>
          </plugin>
  
  
          <!--manven打包插件-->
          <plugin>
              <groupId>org.apache.maven.plugins</groupId>
              <artifactId>maven-shade-plugin</artifactId>
              <version>2.4.3</version>
              <executions>
           <execution>
                <phase>package</phase>
                <goals>
                    <goal>shade</goal>
                </goals>
                <configuration>
                    <filters>
                        <filter>
                            <artifact>*:*</artifact>
                            <excludes>
                                <exclude>META-INF/*.SF</exclude>
                                <exclude>META-INF/*.DSA</exclude>
                                <exclude>META-INF/*.RSA</exclude>
                            </excludes>
                        </filter>
                    </filters>
                    <transformers>
                        <transformer
                                implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                            <resource>reference.conf</resource>
                        </transformer>
                        <transformer
                                implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                            <mainClass>cn.itcast.rpc.Master</mainClass> <!--main方法-->
                        </transformer>
                    </transformers>
                </configuration>
             /execution>
              </executions>
          </plugin>
  
  
          </plugins>
      </build>
  </project>
  

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