Can't compile Spring Roo project when using Nexus - maven

Question

Can't compile Spring Roo (1.2.3.RELEASE) project when using Nexus.
mvn says can't find roo.annotations:jar
[ERROR] Failed to execute goal on project Roo123: Could not resolve dependencies for project com.example.roo:Roo123:jar:0.1.0.BUILD-SNAPSHOT: Failure to find org.springframework.roo:org.springframework.roo.annotations:jar:1.2.3.RELEASE in http://192.168.16.232:8081/nexus/content/groups/public was cached in the local repository, resolution will not be reattempted until the update interval of nexus has elapsed or updates are forced -> [Help 1]
However this jar is already in local maven repository.
When disabling Nexus, by renaming .m2\settings.xml, it works fine.
settings.xml has just 1 mirror configured
<mirror>
<id>nexus</id>
<mirrorOf>*</mirrorOf>
<url>http://192.168.16.232:8081/nexus/content/groups/public</url>
</mirror>
How to configure Nexus?
(Adding http://spring-roo-repository.springsource.org/release as proxy repository doesn't help)
UPDATE: add picture. Adding spring-roo-repository on the left side doesn't help.
Two long answeres below doesn't help either.

Answer 1

It's not enough to configuration a mirrorof only you have to configure the following:
<settings>
<mirrors>
<mirror>
<!--This sends everything else to /public -->
<id>nexus</id>
<mirrorOf>*</mirrorOf>
<url>http://localhost:8081/nexus/content/groups/public</url>
</mirror>
</mirrors>
<profiles>
<profile>
<id>nexus</id>
<!--Enable snapshots for the built in central repo to direct -->
<!--all requests to nexus via the mirror -->
<repositories>
<repository>
<id>central</id>
<url>http://central</url>
<releases><enabled>true</enabled></releases>
<snapshots><enabled>true</enabled></snapshots>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>central</id>
<url>http://central</url>
<releases><enabled>true</enabled></releases>
<snapshots><enabled>true</enabled></snapshots>
</pluginRepository>
</pluginRepositories>
</profile>
</profiles>
<activeProfiles>
<!--make the profile active all the time -->
<activeProfile>nexus</activeProfile>
</activeProfiles>
</settings>
Apart from your configuration you need to delete your local repository and retry the build. Have you configured Nexus correctly to have access to the internet like maven central etc. ?

Answer 2

I don't know if you have admin access to your Nexus install, but you have to add a new proxy repository to your Nexus install.
The repo you have to add is
http://spring-roo-repository.springsource.org/release
You should have a settings file like below (slightly different than khmarbaise's version):
<settings
xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">
<servers>
<server>
<id>central</id>
<username>your-user</username>
<password>your-user</password>
</server>
<server>
<id>mirror</id>
<username>your-user</username>
<password>your-user</password>
</server>
</servers>
<mirrors>
<mirror>
<id>mirror</id>
<url>https://url.to.your.nexus</url>
<mirrorOf>*</mirrorOf>
</mirror>
</mirrors>
<profiles>
<profile>
<id>defaultprofile</id>
<repositories>
<repository>
<id>central</id>
<name>Repository for your artifacts</name>
<url>https://url.to.your.nexus</url>
<releases>
<enabled>true</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>central</id>
<name>Repository for your artifacts</name>
<url>https://url.to.your.nexus</url>
<releases>
<enabled>true</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
</snapshots>
</pluginRepository>
</pluginRepositories>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<activation>
<activeByDefault>true</activeByDefault>
</activation>
</profile>
</profiles>
<activeProfiles>
<activeProfile>defaultprofile</activeProfile>
</activeProfiles>
</settings>
You have to override central (see above), so that Maven won't connect to the default central (repo1.maven.org).