LORA上maven中的java.lang.ClassNotFoundException

Question

（我知道以前已经问过这个问题，但我不能用这些答案解决这个问题）
我对Java很陌生，我正尝试编写一些代码来访问和使用https://console.thethingsnetwork.org/中的数据，当我执行mvn-x-f“c:\xampp\perl\vendor\lib\apache\apache-maven-3.5.3\bin\data-mqtt\pom.xml”clean compile exec:
时，我得到了这个结果。（调试/来自终端的错误）

null

到目前为止，这是我的app.java

 `
public class App {
public static Client client;

public static void main(String[] args) {
    String region = "eu";
    String appId = "stuf1";
    String accessKey = "stuf2";

   try {
        client = new Client(region, appId, accessKey);
    } catch (URISyntaxException var5) {
        System.out.println(var5);
    }
    client.onError((_error) -> {
        System.out.println("error: " + _error.getMessage());
    });
    client.onConnected((_client) -> {
        System.out.println("connected !");
    });
}}

和我的pom.xml

    <repositories>
    <repository>
      <id>Codehaus Mojo</id>
      <name>Codehaus Mojo</name>
      <url>https://oss.sonatype.org/content/repositories/codehaus- 
      snapshots/</url>
      </repository>
  </repositories>
    <build>
    <plugins>
    <plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>exec-maven-plugin</artifactId>
    <version>1.6.0</version>
          <configuration>
            <classpathScope>test</classpathScope>
            <mainClass>App</mainClass>
          </configuration>
          <executions>
            <execution>
              <id>run-App.java</id>
              <phase>integration-test</phase>
              <goals><goal>java</goal></goals>
            </execution>
          </executions>
        </plugin>
        <plugin>
          <artifactId>maven-assembly-plugin</artifactId>

          <configuration>
            <descriptorRefs>
              <descriptorRef>jar-with-dependencies</descriptorRef>
            </descriptorRefs>
          </configuration>

          <executions>
            <execution>
              <id>make-assembly</id>
              <phase>package</phase>
              <goals>
                <goal>single</goal>
              </goals>
            </execution>
          </executions>
        </plugin>

        <plugin>
          <artifactId>maven-clean-plugin</artifactId>
          <version>3.0.0</version>
        </plugin>
         <plugin>
          <artifactId>maven-resources-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.7.0</version>
          <configuration>
            <staleMillis>1</staleMillis>
            <useIncrementalCompilation>false</useIncrementalCompilation>
          </configuration>
        </plugin>
        <plugin>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.21.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-jar-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-install-plugin</artifactId>
          <version>2.5.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-deploy-plugin</artifactId>
          <version>2.8.2</version>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
</project>

如果有人能帮助我，我将不胜感激，如果你需要更多的细节，请问。

Answer 1

未将Proper路径 app 更改为 org.theThingsNetwork.samples.mqtt.app