[Java] [Eclipse] NoClassDefFoundError / ClassNotFoundException＆gt;＆gt;＆gt; ObjectMapper

Question

最近和业余的java开发者，在Eclipse IDE上，我加入了服务器游戏的志愿者。我的服务器插件有问题。它通常与我们的网站链接，但链接似乎有缺陷。原因似乎是＆＃34; ObjectMapper＆＃34;插件找不到：

[21:20:16] [Thread-8/WARN]: Exception in thread "Thread-8" 
[21:20:16] [Thread-8/WARN]: java.lang.NoClassDefFoundError: org/codehaus/jackson/map/ObjectMapper
[21:20:16] [Thread-8/WARN]:     at main.java.com.naheulcraft.specific.Ressources.FeatureFunctions$AsynchronousAPISender$APISenderRunnable.run(FeatureFunctions.java:669)
[21:20:16] [Thread-8/WARN]:     at java.lang.Thread.run(Unknown Source)
[21:20:16] [Thread-8/WARN]: Caused by: java.lang.ClassNotFoundException: org.codehaus.jackson.map.ObjectMapper
[21:20:16] [Thread-8/WARN]:     at java.net.URLClassLoader.findClass(Unknown Source)
[21:20:16] [Thread-8/WARN]:     at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:101)
[21:20:16] [Thread-8/WARN]:     at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86)
[21:20:16] [Thread-8/WARN]:     at java.lang.ClassLoader.loadClass(Unknown Source)
[21:20:16] [Thread-8/WARN]:     at java.lang.ClassLoader.loadClass(Unknown Source)
[21:20:16] [Thread-8/WARN]:     ... 2 more

以下依赖性在pom.xml中，Maven似乎检测到它：

<dependency>
        <groupId>org.codehaus.jackson</groupId>
        <artifactId>jackson-mapper-asl</artifactId>
        <version>1.9.11</version>
        <type>jar</type>
        <scope>compile</scope> 
    </dependency>

导入中没有错误：

import org.codehaus.jackson.map.ObjectMapper;
[...]

private class APISenderRunnable implements Runnable
        {
            Map<String, String> params;
            APISenderRunnable(Map<String, String> params)
            {
                this.params = params;
            }

            public void run()
            {
                ObjectMapper mapper = new ObjectMapper();
                String url = FeatureFunctions.BuildFullUrl(NCPlugin.API_URL, params);
                try
                {
                    array = mapper.readTree(new URL(url));
                }
                catch(Exception e)
                {
                    System.out.println("ERROR, URL BUILDING FAILED OR API IS DOWN.");
                }
            }
        }

但它不起作用。我在互联网上尝试了很多命题，比如更改版本，更改.classpath，改用com.faster.xml.jackson.databind，添加.jar和buildpath＆gt;添加外部罐子，清理并构建项目......没有成功。

这是完整的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>com.naheulcraft</groupId>
    <artifactId>specific</artifactId>
    <url>http://www.naheulcraft.com/</url>
    <build>
     <sourceDirectory>src</sourceDirectory>
        <resources>
            <resource>
                <filtering>true</filtering>
                <directory>src</directory>
                <includes>
                    <include>plugin.yml</include>
                </includes>
            </resource>
        </resources>
    <plugins>
        <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>2.0.2</version>
        <configuration>
            <source>1.8</source>
            <target>1.8</target>
            <encoding>${project.build.sourceEncoding}</encoding>
        </configuration>
        </plugin>
        <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-assembly-plugin</artifactId>
        <version>2.4</version>
        <executions>
            <execution>
            <phase>package</phase>
            <goals>
                <goal>single</goal>
            </goals>
            </execution>
        </executions>       
        <configuration>
            <descriptorRefs>
            <descriptorRef>jar-with-dependencies</descriptorRef>
            </descriptorRefs>
        </configuration>
        </plugin>
        <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-resources-plugin</artifactId>
        <version>2.4.3</version>
        <configuration>
            <encoding>${project.build.sourceEncoding}</encoding>
        </configuration>
        </plugin>
    </plugins>
    </build>
    <repositories>
    <repository>
        <id>spigot-repo</id>
        <url>https://hub.spigotmc.org/nexus/content/groups/public/</url>
    </repository>
    <!--<repository>
        <id>bukkit-repo</id>
        <url>http://repo.bukkit.org/content/groups/public</url>
    </repository>-->
    <repository>
        <id>codehaus-snapshots</id>
        <url>http://snapshots.repository.codehaus.org</url>
    </repository>
    </repositories>
    <dependencies>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.1</version>
        </dependency>
    <dependency>
        <groupId>org.codehaus.jackson</groupId>
        <artifactId>jackson-mapper-asl</artifactId>
        <version>1.9.11</version>
        <type>jar</type>
        <scope>compile</scope> 
    </dependency>
    <!--<dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-annotations</artifactId>
        <version>2.9.3</version>
        <type>jar</type>
        <scope>compile</scope> 
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-core</artifactId>
        <version>2.9.3</version>
        <type>jar</type>
        <scope>compile</scope> 
    </dependency>
    <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.3</version>
            <type>jar</type>
            <scope>compile</scope> 
                <exclusions>
                    <exclusion> 
                        <groupId>com.fasterxml.jackson.core</groupId>
                        <artifactId>jackson-annotations</artifactId>
                    </exclusion>
                    <exclusion> 
                        <groupId>com.fasterxml.jackson.core</groupId>
                        <artifactId>jackson-core</artifactId>
                    </exclusion>
             </exclusions> 
    </dependency>-->
    <!--<dependency>
        <groupId>org.bukkit</groupId>
        <artifactId>bukkit</artifactId>
        <version>LATEST</version>
    </dependency>-->
        <dependency>
            <groupId>com.google.code.google-collections</groupId>
            <artifactId>google-collect</artifactId>
            <version>snapshot-20080530</version>
            <type>jar</type>
        </dependency>
    </dependencies>
    <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    <name>NaheulcraftFR-Specific</name>
    <version>1.10</version>
</project>

实际的.classpath：

<?xml version="1.0" encoding="UTF-8"?>
<classpath>
    <classpathentry kind="src" path="src"/>
    <classpathentry exported="true" kind="lib" path="C:/Users/Florent_2/Desktop/Serveur test Spigot/bukkit.jar"/>
    <classpathentry exported="true" kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
        <attributes>
            <attribute name="maven.pomderived" value="true"/>
        </attributes>
    </classpathentry>
    <classpathentry exported="true" kind="lib" path="C:/Users/Florent_2/Desktop/spigot-1.12.2-R0.1-SNAPSHOT-b1577.jar"/>
    <classpathentry exported="true" kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
    <classpathentry exported="true" kind="lib" path="C:/Users/Florent_2/Desktop/jackson-mapper-asl-1.9.11.jar"/>
    <classpathentry exported="true" kind="lib" path="C:/Users/Florent_2/Desktop/jackson-core-asl-1.9.11.jar"/>
    <classpathentry kind="output" path="target/classes"/>
</classpath>

提前感谢您的帮助 弗洛伦特

P.S。 ：抱歉我的英语不好，我是法国人，我不是说英语的人。 我在英语论坛上写作，因为我希望得到更多的帮助。