title: Error in sonar : java.lang.IllegalArgumentException: Parameter 'directory' is not a directory error in sonar
body: <p>I am using Sonar on Tomcat and using on a java project using ant.</p>
  
  <p>when ever i run the sonar in command prompt I am getting following error.</p>
  
  <pre><code>java.lang.IllegalArgumentException: Parameter 'directory' is not a directory
  </code></pre>
  
  <p>In previous project its working fine but when i configure a new project i am getting this error..</p>
  
  <pre><code> &lt;sonar:sonar  key="dk.logica:pensab" version="1.0" xmlns:sonar="antlib:org.sonar.ant"&gt;
  
          &lt;sources&gt;
              &lt;path location="${jpa.base.dir}/src" /&gt;
  
              &lt;path location="${ws.base.dir}/config/xsd" /&gt;
               &lt;fileset dir="${ws.base.dir}/src" &gt;
        &lt;exclude name="**/BuildErrorCode.java"/&gt;
      &lt;/fileset&gt;
  
           &lt;/sources&gt;
  
            &lt;property key="sonar.projectName" value="Pensab" /&gt;
         &lt;!--   &lt;property key="sonar.dynamicAnalysis" value="reuseReports" /&gt;
            &lt;property key="sonar.surefire.reportsPath" value="ZTest/cobertura/xmlreport" /&gt;
            &lt;property key="sonar.cobertura.reportPath" value="ZTest/cobertura/coveragereport/coverage.xml" /&gt; --&gt;
            &lt;property key="sonar.java.source" value="1.6" /&gt;
            &lt;property key="sonar.java.target" value="1.6" /&gt;
  
            &lt;property key="java.specification.version" value="1.6" /&gt;
            &lt;property key="java.runtime.version" value="1.6" /&gt;
            &lt;property key="java.vm.version" value="1.6" /&gt;
            &lt;property key="ant.java.version" value="1.6" /&gt;
  
  
  
            &lt;tests&gt;
              &lt;path location="${ws.base.dir}/src" /&gt;
            &lt;/tests&gt;
  
            &lt;binaries&gt;
              &lt;path refid="allclass" /&gt;
  
              &lt;path location="${ws.base.dir}/config/xsd" /&gt;
  
            &lt;/binaries&gt;
  
            &lt;libraries&gt;
              &lt;path refid="alljars"  /&gt;
              &lt;path location="${ws.base.dir}/config/xsd" /&gt;
  
            &lt;/libraries&gt;
  
          &lt;/sonar:sonar&gt;
        &lt;/target&gt;
  </code></pre>
  
  <p>Complete error</p>
  
  <pre><code>sonar:
  [sonar:sonar] Apache Ant version 1.8.1 compiled on April 30 2010
  [sonar:sonar] Sonar Ant Task version: 1.0
  [sonar:sonar] Loaded from: file:/D:/JavaWorld/ContinuousIntegration/Provider    /workspace/WS/sonar-ant-task-1.0.jar
  [sonar:sonar] Sonar work directory: D:\JavaWorld\ContinuousIntegration\Provider\workspace\WS\.sonar
  [sonar:sonar] Sonar server: http://localhost:8080/sonar/
  [sonar:sonar] Sonar version: 2.8
  [sonar:sonar] [INFO]  Database dialect class org.sonar.jpa.dialect.Derby
  [sonar:sonar] [INFO]  Initializing Hibernate
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(2) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docum
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(3) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docum
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(4) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docum
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(5) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docum
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(6) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docum
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(7) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docum
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(8) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docum
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(9) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docum
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(10) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docu
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(11) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docu
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(12) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docu
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(13) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docu
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(14) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docu
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(15) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docu
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(16) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docu
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(17) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docu
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(18) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docu
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(19) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docu
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(20) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docu
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(21) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docu
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(22) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docu
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(23) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docu
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(24) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docu
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(25) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docu
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(26) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docu
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(27) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docu
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(28) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docu
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(29) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docu
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(31) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docu
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(34) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docu
  [sonar:sonar] [WARN]  Warning parsing XML: XML InputStream(39) schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd', because 1) could not find the docu
  [sonar:sonar] [INFO]  Execution environment: Ant Apache Ant version 1.8.1 compiled on April 30 2010
  [sonar:sonar] [INFO]  -------------  Analyzing MyProject
  [sonar:sonar] [INFO]  Selected quality profile : [name=MyProj,language=java]
  [sonar:sonar] [INFO]  Compare over 5 days (2012-03-04)
  [sonar:sonar] [INFO]  Compare over 30 days (2012-02-08)
  [sonar:sonar] [INFO]  Configure maven plugins...
  [sonar:sonar] [INFO]  Sensor AsynchronousMeasuresSensor...
  [sonar:sonar] [INFO]  Sensor AsynchronousMeasuresSensor done: 1609 ms
  [sonar:sonar] [INFO]  Sensor JavaSourceImporter...
  [sonar:sonar] [INFO]  Sensor JavaSourceImporter done: 2547 ms
  [sonar:sonar] [INFO]  Sensor SquidSensor...
  
  BUILD FAILED
  D:\JavaWorld\ContinuousIntegration\Provider\workspace\WS\sonar-build.xml:80: java.lang.IllegalArgumentException: Parameter 'directory' is not a directory
      at org.apache.commons.io.FileUtils.listFiles(FileUtils.java:358)
      at org.apache.commons.io.FileUtils.listFiles(FileUtils.java:443)
      at     org.sonar.plugins.squid.SquidSensor.hasProjectBytecodeFiles(SquidSensor.java:109)
      at org.sonar.plugins.squid.SquidSensor.getMainBytecodeFiles(SquidSensor.java:95)
      at org.sonar.plugins.squid.SquidSensor.analyzeMainSources(SquidSensor.java:78)
      at org.sonar.plugins.squid.SquidSensor.analyse(SquidSensor.java:62)
      at org.sonar.batch.phases.SensorsExecutor.execute(SensorsExecutor.java:58)
      at org.sonar.batch.phases.Phases.execute(Phases.java:80)
      at org.sonar.batch.ProjectBatch.execute(ProjectBatch.java:59)
      at org.sonar.batch.Batch.analyzeModule(Batch.java:164)
      at org.sonar.batch.Batch.analyzeModules(Batch.java:82)
      at org.sonar.batch.Batch.execute(Batch.java:62)
      at org.sonar.ant.Launcher.executeBatch(Launcher.java:121)
      at org.sonar.ant.Launcher.execute(Launcher.java:60)
      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.sonar.ant.SonarTask.delegateExecution(SonarTask.java:167)
      at org.sonar.ant.SonarTask.execute(SonarTask.java:151)
      at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
      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.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
      at org.apache.tools.ant.Task.perform(Task.java:348)
      at org.apache.tools.ant.Target.execute(Target.java:390)
      at org.apache.tools.ant.Target.performTasks(Target.java:411)
      at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1397)
      at org.apache.tools.ant.Project.executeTarget(Project.java:1366)
      at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
      at org.apache.tools.ant.Project.executeTargets(Project.java:1249)
      at org.apache.tools.ant.Main.runBuild(Main.java:801)
      at org.apache.tools.ant.Main.startAnt(Main.java:218)
      at org.apache.tools.ant.launch.Launcher.run(Launcher.java:280)
      at org.apache.tools.ant.launch.Launcher.main(Launcher.java:109)
  </code></pre>
  
  <p>Anyone suggest me a solution ?</p>