Why isn't clover generating JSON from my pom.xml config?

I have this bit in my pom.xml

<pluginManagement>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-release-plugin</artifactId>
            <version>2.3.2</version>
        </plugin>
        <plugin>
            <groupId>com.atlassian.maven.plugins</groupId>
            <artifactId>clover-maven-plugin</artifactId>
            <version>4.1.2</version>
            <configuration>
                <generateJson>true</generateJson>
                <generateXml>true</generateXml>
                <generateHtml>true</generateHtml>
                <generatePdf>true</generatePdf>
            </configuration>
        </plugin>
    </plugins>
</pluginManagement>

I know PDF & JSON default to false. The others default to true.

Somehow when I do this, I generate HTML, XML, and even the PDF. JSON is nowhere to be found. It even says Generating JSON report to: /example/myrepo/target/site/clover, as it does for the XML. When I go to that folder I see clover.pdf and clover.xml. No clover.json.

If I do the following, it strangely says No report being generated for this module. and then Generating JSON report to: /example/myrepo/target/site/clover.

<configuration>
    <generateJson>true</generateJson>
    <generateXml>false</generateXml>
    <generateHtml>false</generateHtml>
    <generatePdf>false</generatePdf>
</configuration>

If I do this, it goes back to generating reports just "fine" (this example will just create the XML, no HTML). Still no JSON

<configuration>
    <generateJson>true</generateJson>
    <generateXml>true</generateXml>
    <generateHtml>false</generateHtml>
    <generatePdf>false</generatePdf>
</configuration>

Full config (with some things swapped to stay anon)

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <dependencies>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5</version>
        </dependency>
        <dependency>
            <groupId>org.yaml</groupId>
            <artifactId>snakeyaml</artifactId>
            <version>1.18</version>
        </dependency>
        <dependency>
            <groupId>org.mockito</groupId>
            <artifactId>mockito-core</artifactId>
            <version>1.10.19</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.hamcrest</groupId>
            <artifactId>hamcrest-all</artifactId>
            <version>1.3</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <parent>
        <groupId>org.jenkins-ci.plugins</groupId>
        <artifactId>plugin</artifactId>
        <version>1.583</version>
        <relativePath />
    </parent>
    <groupId>com.mynamespace</groupId>
    <artifactId>myartifactid</artifactId>
    <version>1.1.3</version>
    <packaging>hpi</packaging>

    <name>Test</name>
    <description>Test</description>
    <url>https://wiki.jenkins-ci.org/display/JENKINS/TODO+Plugin</url>
    <licenses>
        <license>
            <name>MIT License</name>
            <url>http://opensource.org/licenses/MIT</url>
        </license>
    </licenses>
    <build>
        <testSourceDirectory>src/test/java</testSourceDirectory>
        <testOutputDirectory>${project.build.directory}/test-classes</testOutputDirectory>
        <testResources>
            <testResource>
                <directory>src/test/resources</directory>
            </testResource>
        </testResources>
        <pluginManagement>
            <plugins>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-release-plugin</artifactId>
                    <version>2.3.2</version>
                </plugin>
                <plugin>
                    <groupId>com.atlassian.maven.plugins</groupId>
                    <artifactId>clover-maven-plugin</artifactId>
                    <version>4.1.2</version>
                    <configuration>
                        <generateJson>true</generateJson>
                        <generateXml>true</generateXml>
                        <generateHtml>false</generateHtml>
                        <generatePdf>false</generatePdf>
                    </configuration>
                </plugin>
            </plugins>
        </pluginManagement>
    </build>

    <repositories>
        <repository>
            <id>repo.jenkins-ci.org</id>
            <url>http://repo.jenkins-ci.org/public/</url>
        </repository>
    </repositories>
    <pluginRepositories>
        <pluginRepository>
            <id>repo.jenkins-ci.org</id>
            <url>http://repo.jenkins-ci.org/public/</url>
        </pluginRepository>
    </pluginRepositories>

</project>

Update I ran java -Dclover.license.path=/Users/dstein/Desktop/clover.lic -cp "/Users/dstein/.m2/repository/com/atlassian/clover/clover/4.1.2/*" com.atlassian.clover.reporters.json.JSONReporter -i target/clover/clover.db -o clover_json -d

It generated my folder and threw a lot of JS files in it. Those files sometimes have JSON... but are wrapped in what looks like JSONP cause it will be like processClover({}). Is this expected behavior? Is the fact they call it JSON a misnomer?

It would seem that this feature should have been called JSONP.

The docs show that it is meant to output all those JS files to be consumed by a callback on a webpage. It's not meant to be used for parsing, as you can do with the XML.