[MPMD-306] PMD and CPD goal must specify output file name when custom renderer specified as format.

**[Linus Fernandes](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=fernal73)** opened **[MPMD-306](https://issues.apache.org/jira/browse/MPMD-306?redirect=false)** and commented

https://maven.apache.org/plugins/maven-pmd-plugin/cpd-mojo.html#format

The format configuration option allows the user to specify a custom renderer.

This outputs a file with the name of the custom renderer which is FQCN.

The configuration must have an additional parameter that specifies an output file name.

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**Affects:** 3.13.0

**Issue Links:**
- [MPMD-223](https://issues.apache.org/jira/browse/MPMD-223) Enable specifying file into which report is written

- [MPMD-314](https://issues.apache.org/jira/browse/MPMD-314) PMD report extension not set correctly for custom report class

Start with the PMD and CPD goal configuration documented under the cpd-mojo format option, then review the related MPMD-223 and MPMD-314 issues for existing output-file and extension behavior. Done means a custom renderer can be configured with an explicit output file name instead of producing a file named after its fully qualified class name.

Written by the indexing model from the issue text.