[bugfix] Fix an issue whereby an antlr-maven-plugin that is not compatible with Java 8 was introduced in a482ab2

Author: adamretter

exist-parent/pom.xml

@@ -530,9 +530,9 @@
         <pluginManagement>
             <plugins>
                 <plugin>
-                    <groupId>org.omnifaces</groupId>
+                    <groupId>org.codehaus.mojo</groupId>
                     <artifactId>antlr-maven-plugin</artifactId>
-                    <version>2.4</version>
+                    <version>2.2</version>
                 </plugin>
                 <plugin>
                     <groupId>org.codehaus.mojo</groupId>