Web Rest API Problem

Hi,
I am referring http://documentation.bonitasoft.com/create-your-first-project-web-rest-api-and-maven link for creating my web-rest-api. I download rest-api-example and running tomcat and web-rest-api example but I am getting following exception:-

SLF4J: Failed to load class “org.slf4j.impl.StaticLoggerBinder”.
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
[INFO] Scanning for projects…
[WARNING] The POM for org.eclipse.m2e:lifecycle-mapping:jar:1.0.0 is missing, no dependency information available
[WARNING] Failed to retrieve plugin descriptor for org.eclipse.m2e:lifecycle-mapping:1.0.0: Plugin org.eclipse.m2e:lifecycle-mapping:1.0.0 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.eclipse.m2e:lifecycle-mapping:jar:1.0.0
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building rest-api-example 1.0.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[WARNING] The POM for org.eclipse.m2e:lifecycle-mapping:jar:1.0.0 is missing, no dependency information available
[WARNING] Failed to retrieve plugin descriptor for org.eclipse.m2e:lifecycle-mapping:1.0.0: Plugin org.eclipse.m2e:lifecycle-mapping:1.0.0 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.eclipse.m2e:lifecycle-mapping:jar:1.0.0
[INFO]
[INFO] — exec-maven-plugin:1.3.2:java (default-cli) @ rest-api-example —
[WARNING] Warning: killAfter is now deprecated. Do you need it ? Please comment on MEXEC-6.

response.getStatusLine().getStatusCode():-200
response.getStatusLine().getStatusCode():-200
Deploying organization …
[WARNING]
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:293)
at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.RuntimeException: java.lang.RuntimeException: Failed : HTTP error code : 500 : Internal Server Error
at org.bonitasoft.example.App.importOrganizationFromFile(App.java:298)
at org.bonitasoft.example.App.importOrganization(App.java:271)
at org.bonitasoft.example.App.start(App.java:134)
at org.bonitasoft.example.App.main(App.java:114)
… 6 more
Caused by: java.lang.RuntimeException: Failed : HTTP error code : 500 : Internal Server Error
at org.bonitasoft.example.App.ensureStatusOk(App.java:261)
at org.bonitasoft.example.App.consumeResponse(App.java:221)
at org.bonitasoft.example.App.importOrganizationFromFile(App.java:292)
… 9 more
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 6.430s
[INFO] Finished at: Thu Sep 25 19:17:17 IST 2014
[INFO] Final Memory: 7M/58M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.3.2:java (default-cli) on project rest-api-example: An exception occured while executing the Java class. null: InvocationTargetException: java.lang.RuntimeException: Failed : HTTP error code : 500 : Internal Server Error → [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

Please help me on this issue.
Thanks,