Status returned by url [http://localhost:9000/batch_bootstrap/index] is not valid - sonarqube

Question

When I am trying to run sonar-scanner, I was not able to start sonarqube and this error is being displayed.
INFO: Scanner configuration file: /sonar-scanner-2.8/conf/sonar-scanner.properties
INFO: Project root configuration file: NONE
INFO: SonarQube Scanner 2.8
INFO: Java 1.8.0_91 Oracle Corporation (64-bit)
INFO: Mac OS X 10.12.1 x86_64
INFO: User cache: /.sonar/cache
ERROR: SonarQube server [http://localhost:9000] can not be reached
INFO: ------------------------------------------------------------------------
INFO: EXECUTION FAILURE
INFO: ------------------------------------------------------------------------
INFO: Total time: 0.417s
INFO: Final Memory: 3M/123M
INFO: ------------------------------------------------------------------------
ERROR: Error during SonarQube Scanner execution
org.sonarsource.scanner.api.internal.ScannerException: Unable to execute SonarQube
at org.sonarsource.scanner.api.internal.IsolatedLauncherFactory$1.run(IsolatedLauncherFactory.java:84)
at org.sonarsource.scanner.api.internal.IsolatedLauncherFactory$1.run(IsolatedLauncherFactory.java:71)
at java.security.AccessController.doPrivileged(Native Method)
at org.sonarsource.scanner.api.internal.IsolatedLauncherFactory.createLauncher(IsolatedLauncherFactory.java:71)
at org.sonarsource.scanner.api.internal.IsolatedLauncherFactory.createLauncher(IsolatedLauncherFactory.java:67)
at org.sonarsource.scanner.api.EmbeddedScanner.doStart(EmbeddedScanner.java:218)
at org.sonarsource.scanner.api.EmbeddedScanner.start(EmbeddedScanner.java:156)
at org.sonarsource.scanner.cli.Main.execute(Main.java:72)
at org.sonarsource.scanner.cli.Main.main(Main.java:61)
Caused by: java.lang.IllegalStateException: Fail to download libraries from server
at org.sonarsource.scanner.api.internal.Jars.downloadFiles(Jars.java:93)
at org.sonarsource.scanner.api.internal.Jars.download(Jars.java:70)
at org.sonarsource.scanner.api.internal.JarDownloader.download(JarDownloader.java:39)
at org.sonarsource.scanner.api.internal.IsolatedLauncherFactory$1.run(IsolatedLauncherFactory.java:75)
... 8 more
Caused by: java.lang.IllegalStateException: Status returned by url [http://localhost:9000/batch_bootstrap/index] is not valid: [404]
at org.sonarsource.scanner.api.internal.ServerConnection.callUrl(ServerConnection.java:115)
at org.sonarsource.scanner.api.internal.ServerConnection.downloadString(ServerConnection.java:98)
at org.sonarsource.scanner.api.internal.Jars.downloadFiles(Jars.java:78)
... 11 more
ERROR:
ERROR: Re-run SonarQube Scanner using the -X switch to enable full debug logging.

Answer 1

Actually, you should first start SonarQube. When it runs, then you can start your scanner.
I get the case where my port 9001 was already in used and SonarQube server did't start. To resolve it, I changed the port to 19001 (free on my computer) in SonarQube_Dir/conf/sonar.properties
sonar.search.port=19001
After this change, I was able to start the sonarQube server, and run the scanner.