Set correct compiler version.

src/core/de.evoal.core.plugin/pom.xml

@@ -209,6 +209,27 @@
 				</configuration>
 			</plugin>
 		</plugins>
+
+		<pluginManagement>
+			<plugins>
+				<plugin>
+					<groupId>org.apache.maven.plugins</groupId>
+					<artifactId>maven-compiler-plugin</artifactId>
+					<version>3.10.1</version>
+					<configuration>
+						<forceJavacCompilerUse>true</forceJavacCompilerUse>
+						<annotationProcessorPaths>
+							<path>
+								<groupId>org.projectlombok</groupId>
+								<artifactId>lombok</artifactId>
+								<version>${lombok.version}</version>
+							</path>
+						</annotationProcessorPaths>
+					</configuration>
+				</plugin>
+			</plugins>
+		</pluginManagement>
+
 	</build>
 
 	<distributionManagement>