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Why does Maven download different versions of Spring artifacts?

In my Maven project I have defined a set of Spring dependencies and I notice that in some cases it will select different versions of artifacts even though they are specified the same in my pom.xml.

This is the outline mvn dependency:tree 

[INFO] com.vrutberg.blogping:blogping:war:1.0-SNAPSHOT
[INFO] +- junit:junit:jar:4.7:test
[INFO] +- javax.servlet:servlet-api:jar:2.4:compile
[INFO] +- com.sun.jersey:jersey-server:jar:1.12:compile
[INFO] |  +- asm:asm:jar:3.1:compile
[INFO] |  \- com.sun.jersey:jersey-core:jar:1.12:compile
[INFO] +- com.sun.jersey:jersey-bundle:jar:1.12:compile
[INFO] +- javax.ws.rs:jsr311-api:jar:1.1.1:compile
[INFO] +- org.springframework:spring-core:jar:3.0.0.RC3:compile
[INFO] +- org.springframework:spring-expression:jar:3.0.5.RELEASE:compile
[INFO] +- org.springframework:spring-beans:jar:3.0.0.RC3:compile
[INFO] +- org.springframework:spring-aop:jar:3.0.0.RC3:compile
[INFO] +- org.springframework:spring-context:jar:3.0.0.RC3:compile
[INFO] +- org.springframework:spring-context-support:jar:3.0.5.RELEASE:compile
[INFO] +- org.springframework:spring-tx:jar:3.0.5.RELEASE:compile
[INFO] |  \- aopalliance:aopalliance:jar:1.0:compile
[INFO] +- org.springframework:spring-orm:jar:3.0.5.RELEASE:compile
[INFO] |  \- org.springframework:spring-jdbc:jar:3.0.5.RELEASE:compile
[INFO] +- org.springframework:spring-oxm:jar:3.0.5.RELEASE:compile
[INFO] +- org.springframework:spring-web:jar:3.0.0.RC3:compile
[INFO] +- org.springframework:spring-webmvc:jar:3.0.5.RELEASE:compile
[INFO] |  \- org.springframework:spring-asm:jar:3.0.5.RELEASE:compile
[INFO] +- org.springframework:spring-test:jar:3.0.5.RELEASE:test
[INFO] \- com.sun.jersey.contribs:jersey-spring:jar:1.12:compile
[INFO]    \- com.sun.jersey:jersey-servlet:jar:1.12:compile

In my pom.xml, I have defined a property that I use for all Spring artifacts, and it is defined like this:

<org.springframework.version>3.0.5.RELEASE</org.springframework.version>

And these are my dependencies:

    <!-- spring libraries -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>${org.springframework.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-expression</artifactId>
        <version>${org.springframework.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-beans</artifactId>
        <version>${org.springframework.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-aop</artifactId>
        <version>${org.springframework.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>${org.springframework.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context-support</artifactId>
        <version>${org.springframework.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-tx</artifactId>
        <version>${org.springframework.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-orm</artifactId>
        <version>${org.springframework.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-oxm</artifactId>
        <version>${org.springframework.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>${org.springframework.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>${org.springframework.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-test</artifactId>
        <version>${org.springframework.version}</version>
        <scope>test</scope>
    </dependency>

Why is he using different versions?

Edit:

Ok, so I just opened these warnings. I suppose it has something to do with it:

Downloading: http://download.java.net/maven/2/org/springframework/spring-core/3.0.0.RC3/spring-core-3.0.0.RC3.pom
Downloading: http://repo1.maven.org/maven2/org/springframework/spring-core/3.0.0.RC3/spring-core-3.0.0.RC3.pom
[WARNING] Missing POM for org.springframework:spring-core:jar:3.0.5.RELEASE
Downloading: http://download.java.net/maven/2/org/springframework/spring-beans/3.0.0.RC3/spring-beans-3.0.0.RC3.pom
Downloading: http://repo1.maven.org/maven2/org/springframework/spring-beans/3.0.0.RC3/spring-beans-3.0.0.RC3.pom
[WARNING] Missing POM for org.springframework:spring-beans:jar:3.0.5.RELEASE
Downloading: http://download.java.net/maven/2/org/springframework/spring-aop/3.0.0.RC3/spring-aop-3.0.0.RC3.pom
Downloading: http://repo1.maven.org/maven2/org/springframework/spring-aop/3.0.0.RC3/spring-aop-3.0.0.RC3.pom
[WARNING] Missing POM for org.springframework:spring-aop:jar:3.0.5.RELEASE
Downloading: http://download.java.net/maven/2/org/springframework/spring-context/3.0.0.RC3/spring-context-3.0.0.RC3.pom
Downloading: http://repo1.maven.org/maven2/org/springframework/spring-context/3.0.0.RC3/spring-context-3.0.0.RC3.pom
[WARNING] Missing POM for org.springframework:spring-context:jar:3.0.5.RELEASE
Downloading: http://download.java.net/maven/2/org/springframework/spring-web/3.0.0.RC3/spring-web-3.0.0.RC3.pom
Downloading: http://repo1.maven.org/maven2/org/springframework/spring-web/3.0.0.RC3/spring-web-3.0.0.RC3.pom
[WARNING] Missing POM for org.springframework:spring-web:jar:3.0.5.RELEASE

Why are the sailors missing some artifacts? And why is it falling back to using 3.0.0.RC3?

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In eclipse, at least in the latest version, there is a pom view where you can see the dependency tree so you can see why the library is added as an assertion of another library.



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