Show java warnings on build

pom.xml

@@ -63,6 +63,14 @@
 			<plugin>
 				<artifactId>maven-compiler-plugin</artifactId>
 				<version>3.8.1</version>
+				<configuration>
+					<release>${java.version}</release>
+					<compilerArgs>
+						<arg>-Xlint:all</arg>
+					</compilerArgs>
+					<showWarnings>true</showWarnings>
+					<showDeprecation>true</showDeprecation>
+				</configuration>
 			</plugin>
 			<plugin>
 				<artifactId>maven-surefire-plugin</artifactId>