[ BUILD # : 201206280002 ]
[ JDK VERSION : 1.7.5 ]

I have a maven project with JaCoCo configured
<!-- code coverage -->
            <plugin>
                <groupId>org.jacoco</groupId>
                <artifactId>jacoco-maven-plugin</artifactId>
                <version>0.5.7.201204190339</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>prepare-agent</goal>
                        </goals>
                    </execution>
                    <execution>
                        <id>report</id>
                        <phase>prepare-package</phase>
                        <goals>
                            <goal>report</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

and selected the "Code coverage->Collect and Display Code Coverage" setting in
the  project context menu.
When running all tests for the project by right clicking on the project and
selecting "Test" all tests are run with maven and the agent is active:


[jacoco:prepare-agent]
argLine set to
-javaagent:/home/tkruse/.m2/repository/org/jacoco/org.jacoco.agent/0.5.7.2012041
90339/org.jacoco.agent-0.5.7.201204190339-runtime.jar=destfile=...........target
/jacoco.exec

The repot shows "No data -- have you run your code yet?"

Only when I click on the report to "Run All Tests" the report gets filled with
data.

When having a java file open for which an accompanying test exists, the "Test"
button does not fill in coverage data neither, the "All Tests" button works,
though. It is a little inconvenient to always run all tests to check for the
coverage change of a single file.