mvn exec:java -pl hbc-example

[root@images hbc]# mvn exec:java -pl hbc-example
[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building Hosebird Client Examples 1.2.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] >>> exec-maven-plugin:1.2.1:java (default-cli) @ hbc-example >>>
[INFO] 
[INFO] <<< exec-maven-plugin:1.2.1:java (default-cli) @ hbc-example <<<
Downloading: https://oss.sonatype.org/content/repositories/snapshots/com/twitter/hbc-twitter4j/1.2.1-SNAPSHOT/maven-metadata.xml
Downloading: https://oss.sonatype.org/content/repositories/snapshots/com/twitter/hbc-core/1.2.1-SNAPSHOT/maven-metadata.xml
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Downloading: https://oss.sonatype.org/content/repositories/snapshots/com/twitter/hbc-twitter4j/1.2.1-SNAPSHOT/hbc-twitter4j-1.2.1-SNAPSHOT.jar
Downloading: https://oss.sonatype.org/content/repositories/snapshots/com/twitter/hbc-core/1.2.1-SNAPSHOT/hbc-core-1.2.1-SNAPSHOT.jar
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[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 6:13.520s
[INFO] Finished at: Thu Feb 28 15:34:09 MST 2013
[INFO] Final Memory: 7M/108M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project hbc-example: Could not resolve dependencies for project com.twitter:hbc-example:jar:1.2.1-SNAPSHOT: The following artifacts could not be resolved: com.twitter:hbc-twitter4j:jar:1.2.1-SNAPSHOT, com.twitter:hbc-core:jar:1.2.1-SNAPSHOT: Could not find artifact com.twitter:hbc-twitter4j:jar:1.2.1-SNAPSHOT in sonatype-nexus-snapshots (https://oss.sonatype.org/content/repositories/snapshots) -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyResolutionException
[root@images hbc]# java -version
java version "1.7.0_15"
Java(TM) SE Runtime Environment (build 1.7.0_15-b03)
Java HotSpot(TM) Server VM (build 23.7-b01, mixed mode)
[root@images hbc]# mvn -version
Apache Maven 3.0.5 (r01de14724cdef164cd33c7c8c2fe155faf9602da; 2013-02-19 06:51:28-0700)
Maven home: /usr/local/apache-maven-3.0.5
Java version: 1.7.0_15, vendor: Oracle Corporation
Java home: /usr/java/jdk1.7.0_15/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "2.6.18-92.el5pae", arch: "i386", family: "unix"
[root@images hbc]# 

try doing a "mvn compile" (or mvn install) first, and then make that exec call