Add compile check for dependency convergence and fix resulting errors

Author: Dominik Kus

pom.xml

@@ -40,11 +40,38 @@
             <groupId>org.jetbrains.kotlinx</groupId>
             <artifactId>kotlinx-coroutines-jdk8</artifactId>
             <version>${kotlin-coroutines.version}</version>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.jetbrains.kotlin</groupId>
+                    <artifactId>kotlin-stdlib</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+        <dependency>
+            <groupId>org.jetbrains.kotlinx</groupId>
+            <artifactId>kotlinx-coroutines-core</artifactId>
+            <version>${kotlin-coroutines.version}</version>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.jetbrains.kotlin</groupId>
+                    <artifactId>kotlin-stdlib</artifactId>
+                </exclusion>
+                <exclusion>
+                    <groupId>org.jetbrains.kotlin</groupId>
+                    <artifactId>kotlin-stdlib-common</artifactId>
+                </exclusion>
+            </exclusions>
         </dependency>
         <dependency>
             <groupId>org.jetbrains.kotlinx</groupId>
             <artifactId>kotlinx-coroutines-reactive</artifactId>
             <version>${kotlin-coroutines.version}</version>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.jetbrains.kotlin</groupId>
+                    <artifactId>kotlin-stdlib</artifactId>
+                </exclusion>
+            </exclusions>
         </dependency>
         <dependency>
             <groupId>com.graphql-java</groupId>
@@ -65,6 +92,12 @@
             <groupId>com.fasterxml.jackson.module</groupId>
             <artifactId>jackson-module-kotlin</artifactId>
             <version>${jackson.version}</version>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.jetbrains.kotlin</groupId>
+                    <artifactId>kotlin-reflect</artifactId>
+                </exclusion>
+            </exclusions>
         </dependency>
         <dependency>
             <groupId>com.fasterxml.jackson.datatype</groupId>
@@ -113,6 +146,12 @@
             <artifactId>logback-classic</artifactId>
             <version>1.1.7</version>
             <scope>test</scope>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.slf4j</groupId>
+                    <artifactId>slf4j-api</artifactId>
+                </exclusion>
+            </exclusions>
         </dependency>
         <dependency>
             <groupId>org.spockframework</groupId>
@@ -137,6 +176,12 @@
             <artifactId>reactive-streams-tck</artifactId>
             <version>1.0.2</version>
             <scope>test</scope>
+            <exclusions>
+                <exclusion>
+                    <groupId>junit</groupId>
+                    <artifactId>junit</artifactId>
+                </exclusion>
+            </exclusions>
         </dependency>
     </dependencies>
 
@@ -254,6 +299,26 @@
                     </execution>
                 </executions>
             </plugin>
+
+            <!-- Avoid dependency convergence -->
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-enforcer-plugin</artifactId>
+                <version>3.0.0-M3</version>
+                <executions>
+                    <execution>
+                        <id>enforce</id>
+                        <goals>
+                            <goal>enforce</goal>
+                        </goals>
+                        <configuration>
+                            <rules>
+                                <dependencyConvergence />
+                            </rules>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
     </build>