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Analysis

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:

If you don't then when you run

Maven will understand:

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):

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 :

Maven fails with a SecurityException

The message of the root exception is

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 :

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 http://markmail.org/message/wvfvafgrga5b6tnd.

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.

INVALID HASH

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

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

This error could be due either to:

  • A connection issue with the 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. 
  • 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.

General

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 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 System administrator to relaunch the project analysis with the property sonar.forceAnalysis=true. This limitation has been fixed in 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?
NOSONAR

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

SuppressWarnings

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 SonarQube.

Use the Switch Off Violations plugin

http://docs.codehaus.org/display/SONAR/Switch+Off+Violations+Plugin

Switch off issues

You can review an issue to flag it as false positive directly from the user interface.



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