Bonjour/Bonsoir,

Développeur java amateur et récent, sur Eclipse, je viens de rejoindre l’équipe bénévole d’un serveur de jeu. Je rencontre un problème sur le plugin du serveur. Il est normalement lié à notre site web, mais le lien ne se fait plus correctement. Il semblerait que la cause soit un “ObjectMapper” qui n’est pas trouvé par le plugin :

[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

La dépendance suivante est indiquée dans le pom.xml, et maven semble bien l’avoir prise en compte  :

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

Il n’y a pas d’erreur sur l’importation :

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.");
                }
            }
        }

Et pourtant, ça ne fonctionne pas. J’ai tenté tout ce que j’ai trouvé sur internet, changer la version, utiliser com.fasterxml.jackson.databind à la place, modifier le .classpath, ajouter le jar manuellement via buildpath > external jars, sans succès. Je me suis donc résolu à demander de l’aide.

Voici le pom.xml complet :

<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>

Voici le .classpath actuel :

<?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>

Je vous remercie d’avance.

Florent