[jira] [Created] (MCHECKSTYLE-387) Deprecate method setUpCheckstyleClassloader in 3.1.2

["Benjamin Marwell (Jira)" <ji...@apache.org>]

Benjamin Marwell created MCHECKSTYLE-387:
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             Summary: Deprecate method setUpCheckstyleClassloader in 3.1.2
                 Key: MCHECKSTYLE-387
                 URL: https://issues.apache.org/jira/browse/MCHECKSTYLE-387
             Project: Maven Checkstyle Plugin
          Issue Type: Task
    Affects Versions: 3.1.1
            Reporter: Benjamin Marwell


h2. Current situation

In 3.1.1, the PR [https://github.com/apache/maven-checkstyle-plugin/pull/18] added a {{try-catch}}-block to the to-be-removed method call {{Checker::setClassLoader}}.

Since users should be encuraged to upgrade and maven-plugin-developers should know that this method should be removed some time, a warning is to be issued if the method call was successful (i.e. when not entering the catch block).
h2. Caveat and drawbacks
 * Users will have to update their {{checkstyle.xml}} file because of incompatible changes introduced in {{8.24}}. 
 * Otherwise the warning might confuse users.
 * Once the method call to {{Checker::setClassLoader}} is removed, {{checkstyle}} versions prior to 8.25 or 8.26 (TBD: look up) cannot be used anymore (TBD: verify this claim). But this issue is not about removing this method call any time soon.

h2. Related issues
 * [MCHECKSTYLE-381|[https://issues.apache.org/jira/projects/MCHECKSTYLE/issues/MCHECKSTYLE-381]] The mentioned previous commit.
 * [MCHECKSTYLE-384|[https://issues.apache.org/jira/projects/MCHECKSTYLE/issues/MCHECKSTYLE-384]]: Once Checkstyle Plugin updates to checkstyle > 8.24, the default installation will break existing installations unless users use this method of downgrading their checkstyle version: [https://maven.apache.org/plugins/maven-checkstyle-plugin/examples/upgrading-checkstyle.html.]



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