title: Can not execute Findbugs Caused by: This project contains Java source files that are not compiled
body: <p>I am currently using the sonarqube server 5.6 with scanner 2.6.1 and I keep getting errors during analysis for a java project.
  It appears to complain about some java files not compiled in the binaries folder (there aren't any at all in the binaries folder).
  Once I add the -X parameter I get more exceptions (flagged as ignored), see below.
  any clues?</p>
  
  <p>sonar-project.properties followed by logs</p>
  
  <pre><code>sonar.projectKey=myproj
  sonar.projectName=myproj
  sonar.projectVersion=1.1
  sonar.branch=1.1
  sonar.sources=./java
  sonar.binaries=./deploy
  sonar.log.level=DEBUG
  sonar.verbose=false
  sonar.sourceEncoding=UTF-8
  
  
  INFO: Execute Checkstyle 6.12.1 done: 2365 ms
  INFO: Sensor CheckstyleSensor (done) | time=2377ms
  INFO: Sensor SCM Sensor (wrapped)
  INFO: SCM provider for this project is: svn
  INFO: 9 files to be analyzed
  DEBUG: Working directory: D:\Apps\xxxx
  DEBUG: Annotate file java/src/xxxx.java
  DEBUG: Annotate file java/src/xxxx.java
  DEBUG: Annotate file java/src/xxxx.java
  DEBUG: Annotate file java/src/xxxx.java
  DEBUG: Annotate file java/src/xxxx.java
  DEBUG: Annotate file java/src/xxxx.java
  DEBUG: Annotate file java/src/xxxx.java
  DEBUG: Annotate file java/src/xxxx.java
  DEBUG: Annotate file java/src/xxxx.java
  INFO: 9/9 files analyzed
  INFO: Sensor SCM Sensor (wrapped) (done) | time=3289ms
  INFO: Sensor FindBugs Sensor (wrapped)
  WARN: Findbugs needs sources to be compiled. Please build project before 
  
  executing sonar or check the location of compiled classes to make it possible for Findbugs to analyse your project.
      INFO: ------------------------------------------------------------------------
      INFO: EXECUTION FAILURE
  </code></pre>
  
  <hr>
  
  <p>execution without the -e param</p>
  
  <p>WARN: Findbugs needs sources to be compiled. Please build project before executing sonar or check the location of compiled classes to make it possible for Findbto analyse your project.
  then 
  java.lang.IllegalStateException: Can not execute Findbugs</p>
  
  <p>Caused by: java.lang.IllegalStateException: This project contains Java source files that are not compiled.
          at org.sonar.plugins.findbugs.FindbugsConfiguration.getFindbugsProject(FindbugsConfiguration.java:120)
          at org.sonar.plugins.findbugs.FindbugsExecutor.execute(FindbugsExecutor.</p>
  
  <p>with the -X parameter</p>
  
  <p>com.puppycrawl.tools.checkstyle.api.CheckstyleException: missing key 'severity' in SuppressionCommentFilter</p>
  
  <p>then multiple exceptions 
  DEBUG: Keep looking, ignoring exception
  com.puppycrawl.tools.checkstyle.api.CheckstyleException: Unable to find class for com.puppycrawl.tools.checkstyle.checks.sizes.WhitespaceAroundCheck</p>
  
  <p>then 
  WARN: Findbugs needs sources to be compiled. Please build project before executing sonar or check the location of compiled classes to make it possible for 
  then 
  INFO: EXECUTION FAILURE</p>