wflow-app directory build problem

i have install 3rd party libraries but still having the same problem

F:\backup\jw-community-4.0-SNAPSHOT\wflow-app>mvn install
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Build Order:
[INFO]
[INFO] wflow-jdbc
[INFO] wflow-commons
[INFO] wflow-plugin-base
[INFO] wflow-plugin-archetype
[INFO] wflow-directory
[INFO] wflow-wfengine
[INFO] wflow-core
[INFO] wflow-consoleweb
[INFO] wflow-designer
[INFO] wflow-designerweb
[INFO] wflow-app
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building wflow-jdbc 4.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[WARNING] The POM for com.oracle:ojdbc6:jar:12.1.0.2 is missing, no dependency i
nformation available
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] wflow-jdbc ......................................... FAILURE [  0.171 s]
[INFO] wflow-commons ...................................... SKIPPED
[INFO] wflow-plugin-base .................................. SKIPPED
[INFO] wflow-plugin-archetype ............................. SKIPPED
[INFO] wflow-directory .................................... SKIPPED
[INFO] wflow-wfengine ..................................... SKIPPED
[INFO] wflow-core ......................................... SKIPPED
[INFO] wflow-consoleweb ................................... SKIPPED
[INFO] wflow-designer ..................................... SKIPPED
[INFO] wflow-designerweb .................................. SKIPPED
[INFO] wflow-app .......................................... SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.500 s
[INFO] Finished at: 2014-12-18T22:12:15+05:00
[INFO] Final Memory: 10M/107M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project wflow-jdbc: Could not resolve dependen
cies for project org.joget:wflow-jdbc:jar:4.0-SNAPSHOT: Failure to find com.orac
le:ojdbc6:jar:12.1.0.2 in https://repo.maven.apache.org/maven2 was cached in the
 local repository, resolution will not be reattempted until the update interval
of central has elapsed or updates are forced -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e swit
ch.
[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 rea
d the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyReso
lutionException
F:\backup\jw-community-4.0-SNAPSHOT\wflow-app>mvn install
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Build Order:
[INFO]
[INFO] wflow-jdbc
[INFO] wflow-commons
[INFO] wflow-plugin-base
[INFO] wflow-plugin-archetype
[INFO] wflow-directory
[INFO] wflow-wfengine
[INFO] wflow-core
[INFO] wflow-consoleweb
[INFO] wflow-designer
[INFO] wflow-designerweb
[INFO] wflow-app
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building wflow-jdbc 4.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[WARNING] The POM for com.oracle:ojdbc6:jar:12.1.0.2 is missing, no dependency i
nformation available
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] wflow-jdbc ......................................... FAILURE [  0.203 s]
[INFO] wflow-commons ...................................... SKIPPED
[INFO] wflow-plugin-base .................................. SKIPPED
[INFO] wflow-plugin-archetype ............................. SKIPPED
[INFO] wflow-directory .................................... SKIPPED
[INFO] wflow-wfengine ..................................... SKIPPED
[INFO] wflow-core ......................................... SKIPPED
[INFO] wflow-consoleweb ................................... SKIPPED
[INFO] wflow-designer ..................................... SKIPPED
[INFO] wflow-designerweb .................................. SKIPPED
[INFO] wflow-app .......................................... SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.645 s
[INFO] Finished at: 2014-12-18T22:15:10+05:00
[INFO] Final Memory: 7M/107M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project wflow-jdbc: Could not resolve dependen
cies for project org.joget:wflow-jdbc:jar:4.0-SNAPSHOT: Failure to find com.orac
le:ojdbc6:jar:12.1.0.2 in https://repo.maven.apache.org/maven2 was cached in the
 local repository, resolution will not be reattempted until the update interval
of central has elapsed or updates are forced -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e swit
ch.
[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 rea
d the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyReso
lutionException
F:\backup\jw-community-4.0-SNAPSHOT\wflow-app>

i don't know what i am missing. should i import some db in SQL first ?