lock deletion issue when uploading information to Sonar server on AIX - sonarqube

Question

I'm actually trying to use sonarqube 5.4 on an AIX server and I've got some errors when running the analysis.
the same configuration has been tested on Windows and it's working.
The information are stored in an Oracle database(11gr2)
At the end of the analysis, it says that a lock file can't be deleted, but when I check after this file, it's not there anymore.
I've tried to use the last version of the wrapper, but in vain.
has anyone faced the same issue?
09:58:13.581 DEBUG - POST 500
http:/foobar:9001/api/ce/submit?projectKey=IHM&projectName=IHM
| time=92ms 09:58:13.594 INFO - Analysis report generated in
/applis/swgi/produits/ictools/workdir/batch-report 09:58:13.604 DEBUG
- Couldn't delete lock file: /applis/swgi/produits/ictools/sonar-runner-2.4_IHM/bin/./.sonar_lock
java.nio.file.NoSuchFileException:
/applis/swgi/produits/ictools/sonar-runner-2.4_IHM/bin/./.sonar_lock
at
sun.nio.fs.UnixException.translateToIOException(UnixException.java:98)
at
sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:114)
at
sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:119)
at
sun.nio.fs.UnixFileSystemProvider.implDelete(UnixFileSystemProvider.java:256)
at
sun.nio.fs.AbstractFileSystemProvider.delete(AbstractFileSystemProvider.java:115)
at java.nio.file.Files.delete(Files.java:1137) at
org.sonar.home.cache.DirectoryLock.unlock(DirectoryLock.java:98)
ERROR: Error during Sonar runner execution
org.sonar.runner.impl.RunnerException: Unable to execute Sonar
at org.sonar.runner.impl.BatchLauncher$1.delegateExecution(BatchLauncher.java:91)
at org.sonar.runner.impl.BatchLauncher$1.run(BatchLauncher.java:75)
at java.security.AccessController.doPrivileged(AccessController.java:594)
at org.sonar.runner.impl.BatchLauncher.doExecute(BatchLauncher.java:69)
at org.sonar.runner.impl.BatchLauncher.execute(BatchLauncher.java:50)
at org.sonar.runner.api.EmbeddedRunner.doExecute(EmbeddedRunner.java:102)
at org.sonar.runner.api.Runner.execute(Runner.java:100)
at org.sonar.runner.Main.executeTask(Main.java:70)
at org.sonar.runner.Main.execute(Main.java:59)
at org.sonar.runner.Main.main(Main.java:53) Caused by: org.sonarqube.ws.client.HttpException: Error 500 http:/foobar:9001/api/ce/submit?projectKey=IHM&projectName=IHM
at org.sonarqube.ws.client.BaseResponse.failIfNotSuccessful(BaseResponse.java:32)
at org.sonar.batch.bootstrap.BatchWsClient.failIfUnauthorized(BatchWsClient.java:96)
at org.sonar.batch.bootstrap.BatchWsClient.call(BatchWsClient.java:67)
at org.sonar.batch.report.ReportPublisher.upload(ReportPublisher.java:158)
at org.sonar.batch.report.ReportPublisher.execute(ReportPublisher.java:117)
at org.sonar.batch.phases.PhaseExecutor.publishReportJob(PhaseExecutor.java:129)
at org.sonar.batch.phases.PhaseExecutor.execute(PhaseExecutor.java:112)
at org.sonar.batch.scan.ModuleScanContainer.doAfterStart(ModuleScanContainer.java:185)
at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:135)
at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:120)
at org.sonar.batch.scan.ProjectScanContainer.scan(ProjectScanContainer.java:264)
at org.sonar.batch.scan.ProjectScanContainer.scanRecursively(ProjectScanContainer.java:259)
at org.sonar.batch.scan.ProjectScanContainer.doAfterStart(ProjectScanContainer.java:249)
at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:135)
at org.sonar.batch.scan.ProjectScanContainer.startComponents(ProjectScanContainer.java:127)
at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:120)
at org.sonar.batch.task.ScanTask.execute(ScanTask.java:55)
at org.sonar.batch.task.TaskContainer.doAfterStart(TaskContainer.java:86)
at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:135)
at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:120)
at org.sonar.batch.bootstrap.GlobalContainer.executeTask(GlobalContainer.java:122)
at org.sonar.batch.bootstrapper.Batch.executeTask(Batch.java:119)
at org.sonar.batch.bootstrapper.Batch.execute(Batch.java:79)
at org.sonar.runner.batch.IsolatedLauncher.execute(IsolatedLauncher.java:48)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:95)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
at java.lang.reflect.Method.invoke(Method.java:508)
at org.sonar.runner.impl.BatchLauncher$1.delegateExecution(BatchLauncher.java:87)
... 9 more