Moved to Maven layout

exception-handler/src/main/java/com/raychatter/common/annotation/AnnotationHandler.java

@@ -0,0 +1,57 @@
+package com.raychatter.common.annotation;
+
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.web.servlet.HandlerExceptionResolver;
+import org.springframework.web.servlet.ModelAndView;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Scanner;
+
+public class AnnotationHandler implements HandlerExceptionResolver {
+
+   @Override
+   public ModelAndView resolveException(final HttpServletRequest request,
+                                        final HttpServletResponse response,
+                                        final Object handler,
+                                        final Exception thrownException) {
+
+      final ExceptionHandler exceptionHandlerAnnotation = thrownException.getClass().getAnnotation(ExceptionHandler.class);
+      if (exceptionHandlerAnnotation == null) {
+         return new ModelAndView();
+      }
+
+      return doStuffWithAnnotation(exceptionHandlerAnnotation, thrownException, response);
+   }
+
+   private ModelAndView doStuffWithAnnotation(final ExceptionHandler exceptionHandlerAnnotation, final Exception thrownException, final HttpServletResponse response) {
+
+      response.setContentType(exceptionHandlerAnnotation.contentType());
+      response.setStatus(exceptionHandlerAnnotation.httpStatus().value());
+      try {
+         response.getWriter().write(formatMessage(thrownException));
+      } catch (IOException e) {
+         e.printStackTrace();
+      }
+      return new ModelAndView();
+   }
+
+//   Customize your output message here. If you have multiple dynamic parameters to
+//   put into your template, you can assign them all in this method.
+   private String formatMessage(final Exception thrownException) {
+      return String.format(readTemplate(), thrownException.getMessage());
+   }
+
+   // Reads the template file until the end of the line
+   private String readTemplate() {
+      try {
+        final InputStream templateFile = new ClassPathResource("error.template").getInputStream();
+        return new Scanner(templateFile, "UTF-8").useDelimiter("\\A").next().trim();
+      } catch (IOException exception) {
+        return "Default Error Message: %s";
+      }
+   }
+
+}

exception-handler/src/main/java/com/raychatter/common/annotation/ExceptionHandler.java

@@ -0,0 +1,22 @@
+package com.raychatter.common.annotation;
+
+import org.springframework.http.HttpStatus;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target({
+      ElementType.ANNOTATION_TYPE,
+      ElementType.CONSTRUCTOR,
+      ElementType.FIELD,
+      ElementType.LOCAL_VARIABLE,
+      ElementType.METHOD,
+      ElementType.PARAMETER,
+      ElementType.TYPE})
+public @interface ExceptionHandler {
+   HttpStatus httpStatus() default HttpStatus.OK;
+   String contentType();
+}

exception-handler/src/test/java/com/raychatter/common/annotation/AnnotationHandlerTest.java

@@ -0,0 +1,13 @@
+package com.raychatter.common.annotation;
+
+import junit.framework.TestCase;
+import org.junit.Test;
+
+public class AnnotationHandlerTest extends TestCase {
+
+   @Test
+   public void shouldReturnModelAndViewIfAnnotationIsNull() {
+      AnnotationHandler annotationHandler = new AnnotationHandler();
+   }
+
+}