commit 7688eb9a621ff4932710339988fcd29e9c00d767
author Benjamin Marwell <bmarwell@gmail.com> Thu Feb 27 06:51:54 2020 +0100
committer Benjamin Marwell <bmarwell@apache.org> Mon Dec 07 15:56:40 2020 +0100
tree 5251c49da5b962e0828d7dfa0bc5c9693f778d12
parent 91b8b16d6e125650e9ab26bac7c3ad5b5683c758

[MCHECKSTYLE-387] emit a warning when using an old version of checkstyle.

Signed-off-by: Benjamin Marwell <bmarwell@apache.org>

src/main/java/org/apache/maven/plugins/checkstyle/exec/DefaultCheckstyleExecutor.java

diff --git a/src/main/java/org/apache/maven/plugins/checkstyle/exec/DefaultCheckstyleExecutor.java b/src/main/java/org/apache/maven/plugins/checkstyle/exec/DefaultCheckstyleExecutor.java
index 4481506..94a01e0 100644
--- a/src/main/java/org/apache/maven/plugins/checkstyle/exec/DefaultCheckstyleExecutor.java
+++ b/src/main/java/org/apache/maven/plugins/checkstyle/exec/DefaultCheckstyleExecutor.java
@@ -313,6 +313,13 @@
         try
         {
             checker.setClassLoader( projectClassLoader );
+            /*
+             * MCHECKSTYLE-387: If the previous method call was successful, emit a warning that the user is using
+             * an old version of checkstyle.
+             */
+            getLogger().warn( "Old version of checkstyle detected. Consider updating to >= v8.30" );
+            getLogger().warn( "For more information see: "
+                + "https://maven.apache.org/plugins/maven-checkstyle-plugin/examples/upgrading-checkstyle.html" );
         }
         catch ( NoSuchMethodError ignored )
         {