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I am running a build on maven 3 and its trying to download many different versions of the same JAR. I didn't specify that JAR as a dependency. Any idea why it is doing that?
Downloading: http://download.java.net/maven/2/org/codehaus/jackson/jackson-core-asl/maven-metadata.xml
Downloading: http://CorporateRepo/org/codehaus/jackson/jackson-core-asl/maven-metadata.xml
Downloading: http://repo1.maven.org/maven2/org/codehaus/jackson/jackson-core-asl/maven-metadata.xml
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Downloading: http://CorporateRepo/org/codehaus/jackson/jackson-core-asl/1.5.0-SNAPSHOT/maven-metadata.xml
Downloading: http://download.java.net/maven/2/org/codehaus/jackson/jackson-core-asl/1.5.0-SNAPSHOT/maven-metadata.xml
Downloaded: http://CorporateRepo/org/codehaus/jackson/jackson-core-asl/1.5.0-SNAPSHOT/maven-metadata.xml (372 B at 1.9 KB/sec)
Downloading: http://CorporateRepo/org/codehaus/jackson/jackson-core-asl/1.5.0-SNAPSHOT/jackson-core-asl-1.5.0-20100311.071608-6.pom
Downloaded: http://CorporateRepo/org/codehaus/jackson/jackson-core-asl/1.5.0-SNAPSHOT/jackson-core-asl-1.5.0-20100311.071608-6.pom (2 KB at 5.5 KB/sec)
Downloading: http://CorporateRepo/org/codehaus/jackson/jackson-core-asl/1.5.0/jackson-core-asl-1.5.0.pom
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Downloading: http://CorporateRepo/org/codehaus/jackson/jackson-core-asl/1.6.0-SNAPSHOT/maven-metadata.xml
Downloading: http://download.java.net/maven/2/org/codehaus/jackson/jackson-core-asl/1.6.0-SNAPSHOT/maven-metadata.xml
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Downloading: http://CorporateRepo/org/codehaus/jackson/jackson-core-asl/1.6.0/jackson-core-asl-1.6.0.pom
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Downloading: http://CorporateRepo/org/codehaus/jackson/jackson-core-asl/1.6.2/jackson-core-asl-1.6.2.pom
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Downloading: http://CorporateRepo/org/codehaus/jackson/jackson-core-asl/1.6.6/jackson-core-asl-1.6.6.pom
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Downloading: http://CorporateRepo/org/codehaus/jackson/jackson-core-asl/1.6.7/jackson-core-asl-1.6.7.pom
Downloaded: http://CorporateRepo/org/codehaus/jackson/jackson-core-asl/1.6.7/jackson-core-asl-1.6.7.pom (1016 B at 5.4 KB/sec)
Downloading: http://CorporateRepo/org/codehaus/jackson/jackson-core-asl/1.7.0-SNAPSHOT-SNAPSHOT/maven-metadata.xml
Downloading: http://download.java.net/maven/2/org/codehaus/jackson/jackson-core-asl/1.7.0-SNAPSHOT-SNAPSHOT/maven-metadata.xml
Downloaded: http://CorporateRepo/org/codehaus/jackson/jackson-core-asl/1.7.0-SNAPSHOT-SNAPSHOT/maven-metadata.xml (381 B at 2.0 KB/sec)
Downloading: http://CorporateRepo/org/codehaus/jackson/jackson-core-asl/1.7.0-SNAPSHOT-SNAPSHOT/jackson-core-asl-1.7.0-SNAPSHOT-20101126.221009-1.pom
Downloading: http://download.java.net/maven/2/org/codehaus/jackson/jackson-core-asl/1.7.0-SNAPSHOT-SNAPSHOT/jackson-core-asl-1.7.0-SNAPSHOT-20101126.221009-1.pom
[WARNING] The POM for org.codehaus.jackson:jackson-core-asl:jar:1.7.0-SNAPSHOT-20101126.221009-1 is missing, no dependency information available
Downloading: http://CorporateRepo/org/codehaus/jackson/jackson-core-asl/1.7.0-SNAPSHOT/maven-metadata.xml
Downloading: http://download.java.net/maven/2/org/codehaus/jackson/jackson-core-asl/1.7.0-SNAPSHOT/maven-metadata.xml
Downloaded: http://CorporateRepo/org/codehaus/jackson/jackson-core-asl/1.7.0-SNAPSHOT/maven-metadata.xml (372 B at 1.4 KB/sec)
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Downloading: http://CorporateRepo/org/codehaus/jackson/jackson-core-asl/1.7.0/jackson-core-asl-1.7.0.pom
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Downloading: http://download.java.net/maven/2/org/codehaus/jackson/jackson-core-asl/1.7.1-SNAPSHOT/maven-metadata.xml
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Downloading: http://CorporateRepo/org/codehaus/jackson/jackson-core-asl/1.7.1/jackson-core-asl-1.7.1.pom
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Downloading: http://download.java.net/maven/2/org/codehaus/jackson/jackson-core-asl/1.8.0-SNAPSHOT/maven-metadata.xml
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Downloading: http://CorporateRepo/org/codehaus/jackson/jackson-core-asl/1.8.1-SNAPSHOT/maven-metadata.xml
Downloading: http://download.java.net/maven/2/org/codehaus/jackson/jackson-core-asl/1.8.1-SNAPSHOT/maven-metadata.xml
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Maven downloads plugins and artifacts that your project depends on. Maven does in fact download artifacts from remote repositories, but it downloads the artifact once and keeps a local cache. Maven only downloads most of these dependencies because you've added them to your project.
If the dependency has its own dependencies they will be downloaded as well. This concept is known as "transitive dependency". Now, in order to "fill" the local repo maven has to download the jars to your local hard drive, that's why you see that it downloads a lot of stuff.
By taking advantage of Maven's nearest definition logic, developers can override the version of a dependency by declaring it on the root pom. xml file.
You'll notice it's not actually downloading the jars, just the POMs. My guess would be that the version being specified is not a fixed version, and that maven is digging through the available versions to figure out which one it should use.
Somewhere in the dependency tree this component is being included. You can use mvn dependency:tree to figure out where. Of course, it will still need to download all the POMs even in order to show the tree, but you've already got them now :)
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