In first place you need some reports. To get them you need Checkstyle of course.
Choose source code you desire to create reports from. In the examples here a fictional source is used. Also you need a Checkstyle configuration. A typical place to store this configuration file in a Mavne projetc is src/main/config/checkstyle-ruleset.xml. For this example the configuration for this project is used. For generating a report get the source and type:
$ cd ~/foo $ checkstyle -c src/main/config/checkstyle-ruleset.xml -f xml -o checkstyle-warnings.xml -r src/main/java
This will produce a file checkstyle-warnings.xml which may looks like this for example:
<?xml version="1.0" encoding="UTF-8"?>
<checkstyle version="5.6">
<file name="/home/weltraumschaf/foo/src/main/java/de/weltraumschaf/foo/ApplicationService.java"></file>
<file name="/home/weltraumschaf/foo/src/main/java/de/weltraumschaf/foo/BusinessServiceProvider.java">
<error line="15" column="8" severity="warning" message="Unused import - com.vaadin.data.Validatable."
source="com.puppycrawl.tools.checkstyle.checks.imports.UnusedImportsCheck"/>
<error line="25" column="5" severity="error" message="Missing a Javadoc comment."
source="com.puppycrawl.tools.checkstyle.checks.javadoc.JavadocVariableCheck"/>
<error line="26" column="5" severity="error" message="Missing a Javadoc comment."
source="com.puppycrawl.tools.checkstyle.checks.javadoc.JavadocVariableCheck"/>
<error line="28" column="5" severity="error" message="Missing a Javadoc comment."
source="com.puppycrawl.tools.checkstyle.checks.javadoc.JavadocMethodCheck"/>
<error line="34" column="5" severity="error" message="Missing a Javadoc comment."
source="com.puppycrawl.tools.checkstyle.checks.javadoc.JavadocMethodCheck"/>
<error line="38" column="5" severity="error" message="Missing a Javadoc comment."
source="com.puppycrawl.tools.checkstyle.checks.javadoc.JavadocMethodCheck"/>
</file>
<file name="/home/weltraumschaf/foo/src/main/java/de/weltraumschaf/foo/package-info.java"></file>
<file name="/home/weltraumschaf/foo/src/main/java/de/weltraumschaf/foo/RegistrationService.java"></file>
<file name="/home/weltraumschaf/foo/src/main/java/de/weltraumschaf/foo/ServiceExcpetion.java"></file>
<file name="/home/weltraumschaf/foo/src/main/java/de/weltraumschaf/foo/UserService.java">
<error line="34" column="5" severity="error" message="Missing a Javadoc comment."
source="com.puppycrawl.tools.checkstyle.checks.javadoc.JavadocMethodCheck"/>
<error line="38" column="5" severity="error" message="Missing a Javadoc comment."
source="com.puppycrawl.tools.checkstyle.checks.javadoc.JavadocMethodCheck"/>
</file>
<file name="/home/weltraumschaf/foo/src/main/java/de/weltraumschaf/foo/registration/RegisrationUI.java">
<error line="32" column="8" severity="warning" message="Unused import - org.lafayette.server.domain.Finders."
source="com.puppycrawl.tools.checkstyle.checks.imports.UnusedImportsCheck"/>
</file>
<file name="/home/weltraumschaf/foo/src/main/java/de/weltraumschaf/foo/Registry.java">
<error line="74" column="5" severity="error" message="Missing a Javadoc comment."
source="com.puppycrawl.tools.checkstyle.checks.javadoc.JavadocVariableCheck"/>
<error line="218" column="5" severity="error" message="Missing a Javadoc comment."
source="com.puppycrawl.tools.checkstyle.checks.javadoc.JavadocMethodCheck"/>
<error line="222" column="5" severity="error" message="Missing a Javadoc comment."
source="com.puppycrawl.tools.checkstyle.checks.javadoc.JavadocMethodCheck"/>
</file>
<file name="/home/weltraumschaf/foo/src/main/java/de/weltraumschaf/foo/resources/BaseResource.java">
<error line="159" column="5" severity="error" message="Missing a Javadoc comment."
source="com.puppycrawl.tools.checkstyle.checks.javadoc.JavadocMethodCheck"/>
</file>
</checkstyle>
For generating the supressions file feed the generated report into ground zero:
$ groundzero checkstyle-warnings.xml
This will produce a suppressions file like this:
<?xml version="1.0" encoding"UTF-8"?>
<!DOCTYPE suppressions PUBLIC "-//Puppy Crawl//DTD Suppressions 1.1//EN"
"http://www.puppycrawl.com/dtds/suppressions_1_1.dtd">
<suppressions>
<suppress files="/home/weltraumschaf/foo/src/main/java/de/weltraumschaf/foo/BusinessServiceProvider\.java"
lines="15" columns="8" checks="UnusedImportsCheck"/>
<suppress files="/home/weltraumschaf/foo/src/main/java/de/weltraumschaf/foo/BusinessServiceProvider\.java"
lines="25" columns="5" checks="JavadocVariableCheck"/>
<suppress files="/home/weltraumschaf/foo/src/main/java/de/weltraumschaf/foo/BusinessServiceProvider\.java"
lines="26" columns="5" checks="JavadocVariableCheck"/>
<suppress files="/home/weltraumschaf/foo/src/main/java/de/weltraumschaf/foo/BusinessServiceProvider\.java"
lines="28" columns="5" checks="JavadocMethodCheck"/>
<suppress files="/home/weltraumschaf/foo/src/main/java/de/weltraumschaf/foo/BusinessServiceProvider\.java"
lines="34" columns="5" checks="JavadocMethodCheck"/>
<suppress files="/home/weltraumschaf/foo/src/main/java/de/weltraumschaf/foo/BusinessServiceProvider\.java"
lines="38" columns="5" checks="JavadocMethodCheck"/>
<suppress files="/home/weltraumschaf/foo/src/main/java/de/weltraumschaf/foo/UserService\.java" lines="34"
columns="5" checks="JavadocMethodCheck"/>
<suppress files="/home/weltraumschaf/foo/src/main/java/de/weltraumschaf/foo/UserService\.java" lines="38"
columns="5" checks="JavadocMethodCheck"/>
<suppress files="/home/weltraumschaf/foo/src/main/java/de/weltraumschaf/foo/registration/RegisrationUI\.java"
lines="32" columns="8" checks="UnusedImportsCheck"/>
<suppress files="/home/weltraumschaf/foo/src/main/java/de/weltraumschaf/foo/Registry\.java"
lines="74" columns="5" checks="JavadocVariableCheck"/>
<suppress files="/home/weltraumschaf/foo/src/main/java/de/weltraumschaf/foo/Registry\.java"
lines="218" columns="5" checks="JavadocMethodCheck"/>
<suppress files="/home/weltraumschaf/foo/src/main/java/de/weltraumschaf/foo/Registry\.java"
lines="222" columns="5" checks="JavadocMethodCheck"/>
<suppress files="/home/weltraumschaf/foo/src/main/java/de/weltraumschaf/foo/resources/BaseResource\.java"
lines="159" columns="5" checks="JavadocMethodCheck"/>
</suppressions>