Enable more compiler warnings and treat warnings as errors

Closes gh-381

Author: wilkinsona

pom.xml

@@ -400,6 +400,11 @@
 				<configuration>
 					<source>${java.version}</source>
 					<target>${java.version}</target>
+					<compilerArgument>-Werror</compilerArgument>
+					<compilerArgument>-Xlint:deprecation</compilerArgument>
+					<compilerArgument>-Xlint:rawtypes</compilerArgument>
+					<compilerArgument>-Xlint:unchecked</compilerArgument>
+					<compilerArgument>-Xlint:varargs</compilerArgument>
 				</configuration>
 			</plugin>
 			<plugin>

spring-javaformat-gradle/spring-javaformat-gradle-plugin/build.gradle

@@ -61,4 +61,10 @@ artifacts {
 	archives javadocJar
 }
 
-
+tasks.withType(JavaCompile) {
+	options.compilerArgs.add("-Werror")
+	options.compilerArgs.add("-Xlint:deprecation")
+	options.compilerArgs.add("-Xlint:rawtypes")
+	options.compilerArgs.add("-Xlint:unchecked")
+	options.compilerArgs.add("-Xlint:varargs")
+}