java - 无法在项目 mavenproject2 上执行目标 org.codehaus.mojo :exec-maven-plugin:1. 3.2:exec(默认):

Question

我开始尝试在 Java 中使用 Vert.x。 IDE 是 Netbeans 版本 8.1。 Vert.x 的版本是 3.0.0。该项目的代码如下所示。下面还列出了 pom.xml 文件。此代码将在 Netbeans IDE 中运行，但如果没有下面的构建报告中显示的错误，构建(对于 jar 文件)将无法完成。因此，生成的jar文件将不会执行。我研究了我可以在互联网上找到的所有资源，但找不到足够的解决方案/答案。如果任何人能够提供解决此问题的任何帮助，我将不胜感激。

POM 文件是在创建新项目时由 Netbeans IDE 生成的:文件 - 新建项目 - Maven - 来自 Archetype 的项目 - vertx-java-archetype然后我添加了 main() 方法。

详细的构建错误报告:

    --- maven-jar-plugin:2.3.2:jar (default-jar) @ mavenproject2 ---
    Building jar: C:\Projects\GenMatchJ\mavenproject2\target\mavenproject2-1.0-SNAPSHOT.jar

    --- maven-shade-plugin:2.3:shade (default) @ mavenproject2 ---
    Including io.vertx:vertx-core:jar:3.0.0 in the shaded jar.
    Including io.netty:netty-common:jar:4.0.28.Final in the shaded jar.
    Including io.netty:netty-buffer:jar:4.0.28.Final in the shaded jar.
    Including io.netty:netty-transport:jar:4.0.28.Final in the shaded jar.
    Including io.netty:netty-handler:jar:4.0.28.Final in the shaded jar.
    Including io.netty:netty-codec:jar:4.0.28.Final in the shaded jar.
    Including io.netty:netty-codec-http:jar:4.0.28.Final in the shaded jar.
    Including com.fasterxml.jackson.core:jackson-core:jar:2.5.3 in the shaded jar.
    Including com.fasterxml.jackson.core:jackson-databind:jar:2.5.3 in the shaded jar.
    Including com.fasterxml.jackson.core:jackson-annotations:jar:2.5.0 in the shaded jar.
    Including io.vertx:vertx-web:jar:3.0.0 in the shaded jar.
    Including io.vertx:vertx-auth-common:jar:3.0.0 in the shaded jar.

    --- exec-maven-plugin:1.3.2:exec (default) @ mavenproject2 ---
    ------------------------------------------------------------------------
    BUILD FAILURE
    ------------------------------------------------------------------------
    Total time: 3.290s
    Finished at: Sun Jun 05 13:01:40 EDT 2016
    Final Memory: 30M/313M
    ------------------------------------------------------------------------
    Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.3.2:exec (default) on project mavenproject2: The parameters 'executable' for goal org.codehaus.mojo:exec-maven-plugin:1.3.2:exec are missing or invalid -> [Help 1]

To see the full stack trace of the errors, re-run Maven with the -e switch.
Re-run Maven using the -X switch to enable full debug logging.

For more information about the errors and possible solutions, please read the following articles:
[Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginParameterException

POM.XML 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.ssp</groupId>
  <artifactId>mavenproject2</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>jar</packaging>

  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>io.vertx</groupId>
        <artifactId>vertx-dependencies</artifactId>
        <version>3.0.0</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
    </dependencies>
  </dependencyManagement>


  <dependencies>
    <dependency>
      <groupId>io.vertx</groupId>
      <artifactId>vertx-core</artifactId>
    </dependency>
    <dependency>
      <groupId>io.vertx</groupId>
      <artifactId>vertx-web</artifactId>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.3</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-shade-plugin</artifactId>
        <version>2.3</version>
        <executions>
          <execution>
            <phase>package</phase>
            <goals>
              <goal>shade</goal>
            </goals>
            <configuration>
              <transformers>
                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                  <manifestEntries>
                    <Main-Class>io.vertx.core.Starter</Main-Class>
                    <Main-Verticle>com.ssp.mavenproject2.Main</Main-Verticle>
                  </manifestEntries>
                </transformer>
                <transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                  <resource>META-INF/services/io.vertx.core.spi.VerticleFactory</resource>
                </transformer>
              </transformers>
              <artifactSet></artifactSet>
              <outputFile>${project.build.directory}/mavenproject2-${project.version}-fat.jar</outputFile>
            </configuration>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>exec-maven-plugin</artifactId>
        <version>1.3.2</version>
        <executions>
          <execution>
            <phase>verify</phase>
            <goals>
              <goal>exec</goal>
            </goals>
          </execution>
        </executions>
        <configuration>
          <mainClass>io.vertx.core.Starter</mainClass>
          <additionalClasspathElements>
            <additionalClasspathElement>${basedir}/src/main/java/</additionalClasspathElement>
          </additionalClasspathElements>
          <systemProperties>
            <systemProperty>
              <key>vertx.deployment.options.redeploy</key>
              <value>true</value>
            </systemProperty>
            <systemProperty>
              <key>vertx.deployment.options.redeployScanPeriod</key>
              <value>100</value>
            </systemProperty>
          </systemProperties>
          <arguments>
            <argument>run</argument>
            <argument>com/ssp/mavenproject2/Main.java</argument>
            <!--                  <argument>-cluster</argument>
            <argument>-cluster-host</argument>
            <argument>127.0.0.1</argument>-->
          </arguments>
        </configuration>
      </plugin>
    </plugins>
  </build>
    <name>MainSsp</name>
    <description>Main entry point for SSP Example with embedded Vert.x</description>
</project>

源代码:

package com.ssp.mavenproject2;

import io.vertx.core.AbstractVerticle;
import io.vertx.core.Vertx;

import javax.swing.JOptionPane;


/**
 *
 */
public class Main extends AbstractVerticle {

  public static void main(String[] args) {


      JOptionPane.showMessageDialog(null, "This Vert.x/Java integration is UUUGGGGHH tough without documentation...");


      // Create an HTTP server which simply returns "Hello World!" to each request.
      Vertx.vertx().createHttpServer().requestHandler(req -> req.response().end("Hello World!")).listen(8080);

      Vertx.vertx().setPeriodic(3000, res -> {
        System.out.println("Periodic event triggered.");
      });

      try{

          Thread.sleep(30000);
      }catch(Exception e)
      {
         System.out.println("Exception caught");
      }
  }  

  @Override
  public void start() throws Exception {
    vertx.setPeriodic(3000, res -> {
      System.out.println("Periodic event triggered.");
    });
  }

}

Answer 1

看起来您正在尝试运行 mvn exec:exec 但为此您需要指定可执行文件(您收到的错误)。在这种情况下，可执行文件应该是您的 java 二进制文件，例如:/usr/java/latest/bin/java(如果您使用的是 Linux 和 Oracle RPM)。

或者，您应该执行:mvn exec:java，它知道可执行文件是java，并且知道如何从 pom 文件中选择类路径依赖项。

现在，如果您注意代码，您会发现 public static void main 方法从未被调用，您的 exec 插件使用 vert.x 启动器而不是您的类，因此当您的应用程序启动时不会有任何服务器，只有在 start 方法内执行的周期性代码。

如果您执行 main，那么您仍然缺少部署 verticle，因此您拥有服务器但没有定期任务，为了实现这一点，您需要添加:

vertx.deployVerticle(Main.class.getName());