error when try to build maven

I have error when to build new vaadin project using maven. I had no problem when I create project using ivy.

Error messages:
[INFO] --- maven-compiler-plugin:3.0:compile (default-compile) @ demo-widgetset ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 4 source files to /Users/helmi/Documents/workspace/demo/demo-widgetset/target/classes
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO] 
[INFO] demo-parent ........................................ SUCCESS [  0.322 s]
[INFO] demo-widgetset ..................................... FAILURE [  1.171 s]
[INFO] demo-backend ....................................... SKIPPED
[INFO] demo-ui ............................................ SKIPPED
[INFO] demo-production .................................... SKIPPED
[INFO] -----------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.738 s
[INFO] Finished at: 2016-06-23T07:58:40+08:00
[INFO] Final Memory: 9M/23M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.0:compile (default-compile) on project demo-widgetset: Fatal error compiling: invalid target release: 1.8 -> [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 :demo-widgetset

What java version are you running? From the above error it seems your target is java 8

I solved it when switch from java 7 to 8. I had no problem when I used ivy with java 7