Successful build in Maven still showing errors in Eclipse

Question

I'm having something quite peculiar here, my build is successful in maven when I type "mvn clean install" however once imported into Eclipse it's showing errors.

See for yourself:

I guess exluding quartz from the `pom.xml solved the problem but I'd like to know why.

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PS: Here is the pom.xml in case you want to see it:

<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.nantes.mpclient</groupId>   <artifactId>MyClient</artifactId>   <version>1.0-SNAPSHOT</version>   <packaging>jar</packaging>    <name>MyClient</name>   <url>http://maven.apache.org</url>    <properties>     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>   </properties>    <dependencies>     <dependency>       <groupId>junit</groupId>       <artifactId>junit</artifactId>       <version>3.8.1</version>       <scope>test</scope>     </dependency>     <dependency>         <groupId>com.nantes.mp</groupId>         <artifactId>MyEjb</artifactId>         <version>1.0-SNAPSHOT</version>     </dependency>     <dependency>         <groupId>org.jboss.jbossas</groupId>         <artifactId>jboss-as-client</artifactId>         <version>5.1.0.GA</version>         <type>pom</type>     </dependency>   </dependencies> </project> 

###EDIT As you can see quartz is here:

Answer 1

Updating maven project after importing it has fixed this issue for me:

Right click on the project --> Maven --> Update project.