Hi,
I’m writing a paper (“Hausarbeit” / “Seminar”) for university on CMMN and tried following the CMMN tutorial.
At step “Instantiate and Test” in the CMMN tutorial after right-clicking on the pom.xml-file and clicking on “Run As / Maven Install” I get the following message (of course I ran the “Maven Clean”-command before):
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building loan-approval-cmmn 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ loan-approval-cmmn ---
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying 2 resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ loan-approval-cmmn ---
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding Cp1252, i.e. build is platform dependent!
[INFO] Compiling 1 source file to C:\Users\Felix\Dropbox\WInfo-Studium\WS_JavaStudium\CMMN2\loan-approval-cmmn\target\classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?
[INFO] 1 error
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.633 s
[INFO] Finished at: 2016-12-12T22:19:15+01:00
[INFO] Final Memory: 9M/150M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project loan-approval-cmmn: Compilation failure
[ERROR] No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?
[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/MojoFailureException
I couldn’t find any helpful information on this error as my Eclipse-Installation would perform just fine on other Java-Projects - and even at step “Project Setup” after editing the pom.xml-file and running the command “Run As / Maven Install” everything works just fine (“Build Success”).
I even tried it with your pre-packed Catch-up-ZIPs - (Import, Run as / Maven Clean -> Success, Run as / Maven Build -> Failure, same message as above).
I also deleted the .m2-folder in the User-directory for a fresh clean build.
My system:
Windows 10 x64 German
Eclipse.1a Neon 4.6.1 x64
Java JRE 1.8.0_65
Java JDK 1.8.0_65
camunda-bpm-tomcat-7.6.0
camunda-modeler-1.5.1-win32-ia32
I am very grateful for any help you can provide - thanks! 
Regards,
Felix