linkedin-j:1.0.417-SNAPSHOT is missing

[farahnaj]

i download linkedin-j and want to run examples but when i try to run that code it gives me an error like following :

---

D:\maven linkedin project>mvn install
[INFO] Scanning for projects...
[WARNING]
[WARNING] Some problems were encountered while building the effective model for
com.googlecode.linkedin-j:linkedin-j-core:jar:1.0.417-SNAPSHOT
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-gpg-
plugin is missing. @ com.googlecode.linkedin-j:linkedin-j:1.0.417-SNAPSHOT, D:\m
aven linkedin project\pom.xml, line 55, column 12
[WARNING]
[WARNING] Some problems were encountered while building the effective model for
com.googlecode.linkedin-j:linkedin-j-examples:jar:1.0.417-SNAPSHOT
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-gpg-
plugin is missing. @ com.googlecode.linkedin-j:linkedin-j:1.0.417-SNAPSHOT, D:\m
aven linkedin project\pom.xml, line 55, column 12
[WARNING]
[WARNING] Some problems were encountered while building the effective model for
com.googlecode.linkedin-j:linkedin-j:pom:1.0.417-SNAPSHOT
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-gpg-
plugin is missing. @ line 55, column 12
[WARNING]
[WARNING] It is highly recommended to fix these problems because they threaten t
he stability of your build.
[WARNING]

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after this output is hanged and i need to force stop by "ctrl + c".