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titleTable of Contents
Table of Contents



Connect to the wrong Oracle schema

When having 2 Sonar schemas on the same Oracle instance, especially if they are in 2 different versions, Sonar can get confused and picks the first it finds. In that case, there are two known workarounds:
1. Remove the DBA rights to the Sonar users in Oracle
2. Use sonar.hibernate.default_schema in to set the schema. In that case, -Dsonar.hibernate.default_schema should be used as well during project analysis.

Cannot connect to MySQL database

By default, remote access to MySQL database server is disabled for security reasons. If you want to remotely access to the database server from the Sonar Maven plugin, you need to follow this quick guide.

Failed to start on 64-bit Windows 7

If you have installed a 64-bit version of the JDK or JRE, and Windows is using the 64-bit version by default, then the batch file windows-x86-32\StartSonar.bat will not start the server because the wrapper.exe program called by the batch file cannot load the lib\wrapper.dll library. You can check which version of Java is being used by opening a shell and typing "java -version". If it is a 64-bit version you will see something like "Java HotSpot (TM) 64-Bit Server VM" in the description. You can download a 32-bit version of the JDK or JRE from Oracle and install it. By default it will be installed under C:\Program Files (x86)\Java. Open up a command shell and change to the top-level directory of drive. With "dir /X" you can list the shortened names of the directories. You want the shortened name of the C:\Program Files (x86) directory, or wherever the 32-bit version of the JDK or JRE was installed. You can then add some lines like the following to the StartSonar.bat batch file to put the directory containing the 32-bit version of java.exe in the beginning of the PATH:

Code Block
rem Force the use of a 32-bit JDK because the file lib\wrapper.dll
rem will not load with the 64-bit version which the 64-bit OS uses
rem be default.
PATH C:\PROGRA~2\Java\jdk1.6.0_23\bin;%PATH%
java -version
Failed to start on Windows Vista

Sonar seems unable to start when installed under the folder "Program Files" in VISTA. It should therefore not be installed there.

Failed to launch the Sonar service on Windows platform with a LocalSystem account

This error happens when the temporary file path specified for the Local System doesn't exist. Assuming that environment variables have their default settings and that Windows is installed on the ‘C’ drive, the following paths should exist:

Windows Server 2003, Windows XP : C:\Windows\system32\config\systemprofile\Local Settings\Temp
Windows Server 2008, Windows 7, Windows Vista: C:\Windows\system32\config\systemprofile\AppData\Local\Temp

In most cases, the "Temp" folder is missing and should be created. See SONAR-2660.

Failed to start Sonar with Oracle due to bad USERS table structure

When another(s) USERS table exists in the Oracle DB, if the sonar user has read access on this other USERS table, the Sonar web server can't start and an exception like the following one is thrown :

Code Block
ActiveRecord::ActiveRecordError: ORA-00904: "TOTO": invalid identifier
: INSERT INTO users (login, name, email, crypted_password, salt, 
created_at, updated_at, remember_token, remember_token_expires_at, toto, id)
VALUES('admin', 'Administrator', '', 'bba4c8a0f808f9798cf8b1c153a4bb4f9178cf59', '2519754f77ea67e5d7211cd1414698f465aacebb',
TIMESTAMP'2011-06-24 22:09:14', TIMESTAMP'2011-06-24 22:09:14', null, null, null, ?)
ActiveRecord::ActiveRecordError: ORA-00904: "TOTO": invalid identifier

: INSERT INTO users (login, name, email, crypted_password, salt, 
created_at, updated_at, remember_token, remember_token_expires_at, toto, id)
VALUES('admin', 'Administrator', '', 'bba4c8a0f808f9798cf8b1c153a4bb4f9178cf59', 
'2519754f77ea67e5d7211cd1414698f465aacebb', TIMESTAMP'2011-06-24 22:09:14', TIMESTAMP'2011-06-24 22:09:14', null, null, null, ?)

See SONAR-2549.
To fix this issue, the rights of the sonar oracle user must be decreased to remove read access on the other(s) USERS table(s).

Failed to connect to update center via proxy

Double-check that settings for proxy in file are specified correctly.
Note that if your username contains "\" (backslash), then it should be escaped - for example username "domain\user" in file should look like:

Code Block

For some proxies exception " Server redirected too many times" might mean incorrect username or password.

Can Sonar run in HTTPS mode

No. But you can run Sonar in a standard HTTPS infrastructure using reverse proxy (in this case the reverse proxy must be configured to set the value 'X_FORWARDED_PROTO: https' in each HTTP request header. Without this property, redirection initiated by the Sonar server will fall back on HTTP).

Solaris: Issue with JRuby 1.6.6 / 1.6.7


Due to the following JRuby issue:, the following line has to be added in conf/wrapper.conf:

Code Block

See SONAR-4046 for more information.


Note that this property has to be set when launching Tomcat (as the wrapper.conf file is not used when deploying in application server).


What is the difference between org.codehaus.mojo:sonar-maven-plugin and org.codehaus.sonar:sonar-maven-plugin?

History: org.codehaus.sonar:sonar-maven-plugin used to be an internal trick to have a Maven plugin released for each SonarQube server version while still allowing users to lock version of the org.codehaus.mojo:sonar-maven-plugin in there pom.xml.

Starting from SonarQube server 4.3 and org.codehaus.mojo:sonar-maven-plugin:2.3, there is no more internal Maven plugin involved. So you can consider org.codehaus.sonar:sonar-maven-plugin as deprecated and ignore it. Note that it will still be released to let people the time to migrate to org.codehaus.mojo:sonar-maven-plugin:2.3.

Should I lock version of SonarQube Maven plugin in my pom.xml?

You can decide to lock the version of the SQ Maven plugin in your pom.xml:

Code Block

If you don't then when you run

Code Block
mvn sonar:sonar

Maven will understand:

Code Block
mvn org.codehaus.mojo:sonar-maven-plugin:LATEST:sonar

and use latest release.

Most of the time you need latest version of the plugin, so no need to fix it in your pom. Except if you want to test a particular version (an old one or a SNAPSHOT for example) or if you want to strictly follow Maven practices.

Cobertura exception on Linux System while accessing the cobertura.ser file

When reading the cobertura.ser file, the Cobertura Maven plugin tries to get a lock on that file. This locking mechanism generates an exception on Linux Systems SONAR-172.

The current workaround is to add the following lines to the pom.xml file (thanks to Wouter de Vaal):

Code Block

The plugin 'org.apache.maven.plugins:maven-sonar-plugin' does not exist or no valid version could be found

If you get this error message after launching the maven command line "mvn sonar:sonar" add the "-U" parameter to the command line. Maven will then update its local repository with the latest version of the Sonar Maven plugin.

If adding the "-U" parameter doesn't fix your issue, you've certainly encountered Maven bug MNG-4001. The only known workaround is to delete the org\codehaus\mojo directory in your local Maven repository. Of course, if your local Maven repository is synchronized with a repository manager like Nexus, this operation must be also done on the repository manager side.

Maven fails with an OutOfMemoryError

Increase the maven available memory by setting the environment variable :

Code Block
MAVEN_OPTS="-Xmx512m -XX:MaxPermSize=256m"

Maven fails with a SecurityException

The message of the root exception is

Code Block
class "org.sonar.commons.database.SchemaInfo$$EnhancerByCGLIB$$15d095d4"'s signer information does not match
signer information of other classes in the same package

The CGLIB library available in your Maven repository is certainly signed which is not the case on IBIBLIO repository. Perhaps you or your Maven administrator have signed this jar to include it into a Java Web Start application. Unfortunately signing CGLIB jar file breaks Hibernate's use of CGLIB, as it generates proxy classes in the same package (org.sonar.commons.database.* for our context) as the original class. But the original Sonar class is not signed and the new proxy class is, generating a java.lang.SecurityException.

You must also sign Sonar libraries in your Maven repository or used unsigned CGLIB library.

Maven fails with a NoClassDefFoundError

Typically error message looks like :

No Format
java.lang.NoClassDefFoundError: org/apache/commons/configuration/Configuration

Possible explanations of such problem :

  1. Your Maven repository (local or remote) contains corrupted JARs.
  2. You have exceeded limit of open files - see

Maven fails because of Maven Enforcer violations

You have to add the parameter -Denforcer.skip=true to the Maven command-line.

Failed to resolve stax2-api artifact

The following error occurs when using Maven Archiva 1.1. It must be upgraded to 1.2.1.

Code Block
[INFO] Failed to resolve artifact.

No versions are present in the repository for the artifact with a range [3.0.0,3.1.0)


While running an analysis, you may face the following error:


It means that the analyzer encountered an issue while downloading the plugins from the Sonar SonarQube server to the machine running the project analysis.


  • A connection issue with the Sonar SonarQube server. Check with your network administrator.
  • A user quota issue. Indeed, by default, all the plugins are downloaded to the local space of the user running the analysis. Some companies set restrictions in terms of local user space, hence the issue. The workaround is to set the '"SONAR_USER_HOME' " environment variable on the machine running the analysis to a directory with enough available space to download all the plugins. 


I have locked myself out

There is currently nothing that stops you removing from every user and every group the global administrator role. the global administrator role. You then have no other solution than make an manual update in the Sonar database to get back in control.

Code Block
INSERT INTO user_roles(user_id, role) VALUES ((select id from users where login='mylogin'), 'admin');
I lost the admin password

In case you lost the admin password of your Sonar instance, you can reset it by running the following update statement :

Code Block
update users set crypted_password = '88c991e39bb88b94178123a849606905ebf440f5', salt='6522f3c5007ae910ad690bb1bdbf264a34884c6d' where login = 'admin'


  • A corrupted local cache due to a corruption while downloading a file. Delete the local cach (or at least the failing directory) and run again the analysis.


Failed to analyse a project as another analysis on the same project seems to be running at the same time (


SonarQube 3.4 only)

In Sonar SonarQube 3.4 (SONAR-3306) a new semaphore mechanism has been introduced to prevent launching several analysis on the same project in parallel. But in some cases when an analysis of a project is unexpectedly interrupted, the lock of the semaphore is sometimes not released and in such case it's up to the Sonar System administrator to relaunch the project analysis with the property 'property sonar.forceAnalysis=true'. This limitation has been fixed in Sonar SonarQube 3.5 (SONAR-4053). 

How to


trigger a full SonarQube ES reindex?

Currently, the only way to force a reindex is to:

  • Stop your server
  • Remove the contents of the $SQ_HOME/data/es directory
  • Start your server
How to remove false positive issues?

You can use the mechanism embedded in underlying rules violation engine (//NOPMD...) or the generic mechanism implemented in Sonar SonarQube: Put put //NOSONAR at the end of the line of the violationissue. This will suppress the violationissue.


The //NOSONAR tag is useful to deactivate all rules at a given line but is not suitable to deactivate all rules (or only a given rule) for all the lines of a method or a class. This is why support for @SuppressWarnings("all") has been added to SonarSonarQube.

Use the Switch Off Violations plugin

Switch off



You can use the Review feature review an issue to flag a violation it as false - positive directly from the user interface.