[MCHECKSTYLE-405] The checkstyle plugin should report the number of all violations

**[Guillaume Nodet](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=gnt)** opened **[MCHECKSTYLE-405](https://issues.apache.org/jira/browse/MCHECKSTYLE-405?redirect=false)** and commented

When there is an error, the build looks like:

```java
[INFO] There is 1 error reported by Checkstyle 8.41.1 with config/maven_checks.xml ruleset.
[ERROR] src/main/java/org/apache/maven/execution/BuildResumptionDataRepository.java:[54,30] (whitespace) ParenPad: '(' is not followed by whitespace.

```

and when this error is fixed, the build then looks like:

```
[INFO] You have 0 Checkstyle violations.
```

The problem is that checkstyle never caches the results for files with violations, even at info or warning level. This cause the files to be always processed, without the user really being aware of any problem.

The number of violations at info or warning level should also be printed. In addition, if there are errors, the output should be logged at WARN level.

---

1 votes, 2 watchers

Reproduce the two output cases using config/maven_checks.xml and the Checkstyle 8.41.1 examples in the issue. Trace the plugin's violation reporting and file-result caching entry points; done means info and warning output includes the total violations, and error output is logged at WARN level.

Written by the indexing model from the issue text.