Snapshot feature broken in maven 2?

[ro...@sdm.de]

Hi!

We use maven 2 to build a large project consisting of several modules. Dependencies between modules are handled by the maven dependency mechanism. During development, we want to use the SNAPSHOT feature because we don't want to have an inflation of version numbers. 

The problem: For me it looks like snapshots are never updated in the local repository.

To track this down, I have done the following test: 

1. Deploy "interface" to our central repository
2. Compile "client" (which depends on "interface")
   pom, jar and metadata are downloaded into local repository.
3. Increased version number and timestamp in the file
   1.0-SNAPSHOT/maven-metadata.xml, recomputed checksums.
4. Run "mvn -U clean compile" on module "client".
This results in the following log:

[INFO] Scanning for projects...
[INFO] ----------------------------------------------------------------------------
[INFO] Building Client for the great calculator
[INFO]    task-segment: [clean, compile]
[INFO] ----------------------------------------------------------------------------
[INFO] artifact org.apache.maven.plugins:maven-clean-plugin: checking for updates from central
[INFO] artifact org.apache.maven.plugins:maven-source-plugin: checking for updates from central
[INFO] artifact org.apache.maven.plugins:maven-surefire-plugin: checking for updates from central
[INFO] [clean:clean]
[INFO] Deleting directory c:\example\client\target
[INFO] Deleting directory c:\example\client\target\classes
[INFO] Deleting directory c:\example\client\target\test-classes
[INFO] artifact org.apache.maven.plugins:maven-resources-plugin: checking for updates from central
[INFO] artifact org.apache.maven.plugins:maven-compiler-plugin: checking for updates from central
[INFO] [source-download:download-sources {execution: default}]

-----> [INFO] snapshot de.sdm.calculator:interface:1.0-SNAPSHOT: checking for updates from central <------

[INFO] [resources:resources]
[INFO] Using default encoding to copy filtered resources.
[INFO] snapshot de.sdm.calculator:calculator-all:1.0-SNAPSHOT: checking for updates from central
[INFO] [compiler:compile]
Compiling 1 source file to c:\example\client\target\classes
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESSFUL

As you can see in the marked line, the check for updates is done. Looking into ~/.m2/repository I can see even the new maven-metadata-central.xml (new timestamp, new content), but the jar is NOT updated from the server. 

Is this intendented behaviour? 

I can solve the problem by setting <uniqueVersion>true</uniqueVersion> master pom of the project, but this clobberes the local repositories of all users and the central repository with lots of old versions. 

Your comments?

Regards

Roger

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