Add Checkstyle to avoid import statements that use the * notation.

Author: Sgitario

301-quarkus-vertx-kafka/src/main/java/io/quarkus/qe/kafka/consumer/KStockPriceConsumer.java

@@ -5,7 +5,12 @@
 import javax.enterprise.context.ApplicationScoped;
 import javax.inject.Inject;
 
-import org.eclipse.microprofile.reactive.messaging.*;
+import org.eclipse.microprofile.reactive.messaging.Acknowledgment;
+import org.eclipse.microprofile.reactive.messaging.Channel;
+import org.eclipse.microprofile.reactive.messaging.Emitter;
+import org.eclipse.microprofile.reactive.messaging.Incoming;
+import org.eclipse.microprofile.reactive.messaging.OnOverflow;
+import org.eclipse.microprofile.reactive.messaging.Outgoing;
 import org.jboss.logging.Logger;
 
 import io.quarkus.qe.kafka.StockPrice;

checkstyle.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE module PUBLIC "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN" "https://checkstyle.org/dtds/configuration_1_3.dtd">
+
+<module name="Checker">
+    <property name="severity" value="error"/>
+    <module name="TreeWalker">
+        <!-- Checks for imports                              -->
+        <!-- See https://checkstyle.org/config_imports.html -->
+        <module name="AvoidStarImport"/>
+        <module name="RedundantImport"/>
+    </module>
+</module>

pom.xml

@@ -52,6 +52,7 @@
         <formatter-maven-plugin.version>2.15.0</formatter-maven-plugin.version>
         <impsort-maven-plugin.version>1.6.0</impsort-maven-plugin.version>
         <xml-format-maven-plugin>3.1.2</xml-format-maven-plugin>
+        <maven-checkstyle-plugin.version>3.1.1</maven-checkstyle-plugin.version>
         <quarkus.platform.artifact-id>quarkus-bom</quarkus.platform.artifact-id>
         <quarkus.platform.group-id>io.quarkus</quarkus.platform.group-id>
         <quarkus.platform.version>999-SNAPSHOT</quarkus.platform.version>
@@ -208,6 +209,28 @@
                     </execution>
                 </executions>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-checkstyle-plugin</artifactId>
+                <version>${maven-checkstyle-plugin.version}</version>
+                <configuration>
+                    <configLocation>checkstyle.xml</configLocation>
+                    <encoding>UTF-8</encoding>
+                    <consoleOutput>true</consoleOutput>
+                    <failsOnError>true</failsOnError>
+                    <linkXRef>true</linkXRef>
+                    <includeTestSourceDirectory>true</includeTestSourceDirectory>
+                </configuration>
+                <executions>
+                    <execution>
+                        <id>validate</id>
+                        <phase>validate</phase>
+                        <goals>
+                            <goal>check</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
     </build>
     <profiles>