How can I get a list (via webservice or sql query) of all the sonar rules with his category (Maintainability, Efficiency, Reliability...etc)

Using xxxxx/api/rules?language=java&plugin=pmd,findbugs :

```
<rule>
<title>Unnecessary Local Before Return</title>
<key>pmd:UnnecessaryLocalBeforeReturn</key>          
<config_key>rulesets/design.xml/UnnecessaryLocalBeforeReturn</config_key> 
<plugin>pmd</plugin>    
<description>Avoid unnecessarily creating local variables</description> 
<priority>MAJOR</priority>
</rule>

```

Where is the category shown in the Technical Debt dashboard??

Thanks!!!