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NameJava Ecosystem
Latest version12.13 ( 22 December 2012 26 june 2014 )
Requires Sonar SonarQube version34.42 or higher ( check version compatibility )
LicenseGNU LGPL 3
Issue tracker
titleLive example

If you want to see a live example of the capabilities of the Java Ecosystem, you can have a look at Sonar SonarQube on Sonar.SonarQube.

titleJava bytecode is required

Analysing a Java project without providing the Java bytecode of the source files and of all the project dependencies (jar files) is possible but will lead to highly decrease the number of issues found by the analyzer (false-negatives). Moreover the detection of cycles between packages and the display of the DSM will be automatically deactivated. As soon as a class required to efficiently do an analysis is missing a warning like the following one is logged :

[WARN] [08:40:21.769] Class 'XXXXXX' is not accessible through the ClassLoader.


Description / Features

The Java Ecosystem is a set of Sonar plugins used to monitor the quality of Java projects within SonarSonarQube.


The Java Ecosystem is a set of plugins:

  • Mandatory plugins:
    • Java [sonar-java-plugin]: to parse Java code source, compute metrics, etc.
    • Squid [sonar-squid-java-plugin]: to compute additional metrics, check code against rules provided by the Sonar engine
  • Optional plugins adding features from external tools:
    • Checkstyle [sonar-checkstyle-plugin]: to check code against rules provided by Checkstyle
    • FindBugs [sonar-findbugs-plugin]: to check code against rules provided by FindBugs
    • PMD [sonar-pmd-plugin]: to check code against rules provided by PMD
    • Surefire [sonar-surefire-plugin]: to execute unit tests with Surefire
    • Cobertura [sonar-cobertura-plugin]: to get code coverage with Cobertura 
    • JaCoCo [sonar-jacoco-plugin]: to get code coverage with JaCoCo

Note that by On top of the coding rules provided by the SonarQube engine, you can activate rules from CheckstyleFindBugsPMDClirr, and fb-contrib. However, we highly recommend that you limit your Quality Profiles to from the SonarQube engine because we believe they are faster, more accurate (fewer false positives and false negatives), and more usable (they have better descriptions, etc). Read this blog post for more details.

If your Quality Profile contains rules from the SonarQube engine or FindBugs rules, then byte code will be required by the analysis. This Java Ecosystem is able to analyse any kind of java source files whatever is the version of Java they comply to.


By default the Java Ecosystem is provided with SonarSonarQube.You  You can update it from the Update Center (since Sonar 3.5) or  or download the latest release from this page header. Don't forget to check the upgrade notes.


Run a


SonarQube Analysis

To launch a Sonar run an analysis of your Java project, it is recommended to you can use the following analyzers:

Note that you must provide both source code and compiled byte code if the Quality Profile in use contains either SonarQube-native rules, or FindBugs rules.

Sample projects for each analyzer are available on GitHub that can be browsed or downloaded: /projects/languages/java


titleFor versions prior to 2.1
  • The source directory


  • must be set to the directory containing the top parent package.


  •  For example, if your directory structure


  • is src/main/java/com/mycompany/...


  • , the source directory must be set


  • to src/main/java


  • .
  • The source directory tree


  • must match the package declaration.


  •  For example, the following class:

    Code Block
    package com.mycompany.mypackage;

    must be located in the following directory: [mySourceDirectory]/com/mycompany/mypackage/


  •  Otherwise you would get


  • an error like below while running your analysis


  • Code Block
    Exception in thread "main" org.sonar.batch.bootstrapper.BootstrapException: org.sonar.squid.api.AnalysisException: Got an exception - org.sonar.squid.api.AnalysisException: The source directory does not correspond to the package declaration com.mycompany.mypackage, file : ..\src\

Unit Tests and Code Coverage


The default code coverage engine for unit tests can be set in Settings > Configuration > General Settings > Java > Code coverage plugin property.

By default the code coverage engine is JaCoCo but CoberturaEmma or Clover can also be used.


To deal with unit tests and code coverage for Java project in Sonar, see Code Coverage by Unit Tests for Java Project tutorial.

To deal with integration tests and code coverage for Java project in Sonar, see Code Coverage by Integration Tests for Java Project tutorial.

Advanced Settings

Documentation on advanced parameters is available on the Analysis Parameters page.

Advanced parameters specific to Java are:

KeyDescriptionDefault value


Deactivate Java bytecode analysis. The Java bytecode is analyzed by Sonar in order to extract dependencies between packages and files. These dependencies are used for instance to display the DSM (Dependency System Matrix). This bytecode analysis can be deactivated.


Java version of the source code. This property is not used by the Sonar core but can be used by Java Sonar plugin like the PMD plugin. 



See Java Ecosystem FAQ.


See Metrics documentation page.



To Go Further


New coding rules can be added using XPath. See the related documentation.


Change Log

JIRA Issues
titleRelease 1.1

Upgrade Notes

Version 2.2

It is no longer possible to let SonarQube drive the execution of the unit tests. You now have to generate the JUnit and code coverage (JaCoCo or Cobertura or Clover) reports prior to the SonarQube analysis and then feed SonarQube with those reports.

Version 2.0

This version no longer includes the Checkstyle and PMD plugins. Therefore, you should install those two plugins if you're still using some of their rules.

All the valuable rules from PMD and Checkstyle were rewritten based on our own SSLR technology. These rules are now available in the SonarQube repository. Deprecated rules from PMD and Checkstyle are flagged as so and their replacement is stated in the rule description:

Image Added

See for more details.

Version 1.5

  • Property sonar.surefire.reportsPath has been removed and replaced by sonar.junit.reportsPath.