I am trying to build CDAP source code by following article from below location-

```
https://github.com/caskdata/cdap

```

But when I try mvn clean package, It will gives build error-

```
.
.
kConfigurer.java:69: First sentence should end with a period.
C:\Users\admin\cdap\cdap-api\src\main\java\co\cask\cdap\api\workflow\WorkflowForkNode.java:21: First sentence should end with a period.
C:\Users\admin\cdap\cdap-api\src\main\java\co\cask\cdap\api\workflow\WorkflowSpecification.java:30: First sentence should end with a period.
C:\Users\admin\cdap\cdap-api\src\main\java\co\cask\cdap\api\workflow\WorkflowToken.java:22: First sentence should end with a period.
Audit done.

[INFO]    ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] Cask Data Application Platform (CDAP) ............. SUCCESS    [1:52.768s]
[INFO] CDAP API .......................................... FAILURE [1:03.487s]
[INFO] CDAP Watchdog API ................................. SKIPPED
[INFO] CDAP Protocol ..................................... SKIPPED
[INFO] CDAP Build Common ................................. SKIPPED
[INFO] CDAP Common ....................................... SKIPPED
[INFO] CDAP Notifications APIs ........................... SKIPPED
[INFO] CDAP Explore Client ............................... SKIPPED
[INFO] CDAP Data-Fabric .................................. SKIPPED
[INFO] CDAP Watchdog ..................................... SKIPPED
 [INFO] CDAP Notifications ................................ SKIPPED
 [INFO] CDAP HBase 0.96 Compatibility ..................... SKIPPED
[INFO] CDAP Data-Fabric Tests ............................ SKIPPED
[INFO] CDAP Java Client .................................. SKIPPED
[INFO] CDAP Test Framework ............................... SKIPPED
[INFO] CDAP App-Fabric ................................... SKIPPED
[INFO] CDAP Explore JDBC Driver .......................... SKIPPED
[INFO] CDAP Explore ...................................... SKIPPED
[INFO] CDAP Unit Test Framework .......................... SKIPPED
[INFO] CDAP CLI .......................................... SKIPPED
[INFO] CDAP Security ..................................... SKIPPED
[INFO] CDAP Gateway ...................................... SKIPPED
[INFO] CDAP UI ........................................... SKIPPED
[INFO] CDAP Standalone ................................... SKIPPED
[INFO] CDAP Java Client Tests ............................ SKIPPED
 [INFO] CDAP CLI Tests .................................... SKIPPED
[INFO] CDAP Kafka Server ................................. SKIPPED
[INFO] CDAP HBase 0.94 Compatibility ..................... SKIPPED
[INFO] CDAP HBase 0.98 Compatibility ..................... SKIPPED
[INFO] CDAP Master ....................................... SKIPPED
[INFO] CDAP Distributions ................................ SKIPPED
[INFO] CDAP Application Archetypes ....................... SKIPPED
[INFO] CDAP Spark Java Archetype ......................... SKIPPED
[INFO] CDAP Spark Scala Archetype ........................ SKIPPED
[INFO] CDAP Application Archetype ........................ SKIPPED
[INFO] CDAP Integration Test Framework ................... SKIPPED
[INFO]   ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 4:35.198s
[INFO] Finished at: Sat May 23 18:56:07 IST 2015
[INFO] Final Memory: 27M/100M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-checkstyle-  
 plugin:2.12.1:check (validate) on project cdap-api: Failed during checkstyle execution:
 There are 68 checkstyle errors. -> [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/MojoExecutionException
[ERROR]
[ERROR] After correcting the problems, you can resume the build with the command

[ERROR]   mvn <goals> -rf :cdap-api C:\Users\admin\cdap>

```

Please suggest what may be cause of this build failure.

Regards