I've configured everything to do a Sonar analysis on a Maven project. Everything is fine until I run `sonar-runner` : 

```
     Max$ sonar-runner
     INFO: Scanner configuration file: /Users/Max/Documents/sonar-scanner-2.5/conf/sonar-runner.properties
     INFO: Project configuration file: NONE
     INFO: SonarQube Scanner 2.5
     INFO: Java 1.7.0_45 Oracle Corporation (64-bit)
     INFO: Mac OS X 10.10.3 x86_64
     INFO: User cache: /Users/Max/.sonar/cache
     INFO: Load global repositories
     INFO: Load global repositories (done) | time=143ms
     INFO: Property 'sonar.jdbc.url' is not supported any more. It will be ignored. There is no longer any DB connection to the SQ database.
     INFO: User cache: /Users/Max/.sonar/cache
     INFO: Load plugins index
     INFO: Load plugins index (done) | time=4ms
     INFO: Default locale: "fr_FR", source code encoding: "UTF-8" (analysis  is platform dependent)
     INFO: Process project properties
     INFO: ------------------------------------------------------------------------
     INFO: EXECUTION FAILURE
     INFO: ------------------------------------------------------------------------
     INFO: Total time: 1.631s
     INFO: Final Memory: 40M/194M
     INFO: ------------------------------------------------------------------------
     ERROR: Error during SonarQube Scanner execution
     ERROR: Unable to load component class org.sonar.batch.scan.ProjectLock
     ERROR: Caused by: Unable to load component class     org.sonar.api.batch.bootstrap.ProjectReactor
     ERROR: Caused by: You must define the following mandatory properties for 'Unknown': sonar.projectKey, sonar.projectName, sonar.projectVersion, sonar.sources
     ERROR: 
     ERROR: To see the full stack trace of the errors, re-run SonarQube  Scanner with the -e switch.
     ERROR: Re-run SonarQube Scanner using the -X switch to enable full debug logging.

```

* I'm running `sonar-runner` inside my java project folder
* I have put and configured the `sonar-runner.properties` in my java project

```
sonar.projectKey=SeleniumMaven:sonar
sonar.projectName=SeleniumMaven
sonar.projectVersion=1.0
sonar.sources=src
sonar.sourceEncoding=UTF-8
sonar.language=java

```

Any idea?