--- antlr-maven-plugin-2.2/src/main/java/org/codehaus/mojo/antlr/AbstractAntlrMojo.java	2010-11-16 16:59:34.000000000 +0100
+++ antlr-maven-plugin-2.2/src/main/java/org/codehaus/mojo/antlr/AbstractAntlrMojo.java	2023-10-26 14:01:46.596367163 +0200
@@ -348,6 +348,10 @@
                                + "Antlr's call to System.exit() can cause application shutdown "
                                + "if not handled by the current SecurityManager." );
         }
+        catch ( UnsupportedOperationException exc )
+        {
+            getLog().warn( exc );
+        }
 
         String originalUserDir = null;
         if ( plan.getImportVocabTokenTypesDirectory() != null )