BAEL-2060 - Bean Validation in Jersey

jersey/src/main/java/com/baeldung/jersey/server/config/ViewApplicationConfig.java

@@ -1,12 +1,14 @@
 package com.baeldung.jersey.server.config;
 
 import org.glassfish.jersey.server.ResourceConfig;
+import org.glassfish.jersey.server.ServerProperties;
 import org.glassfish.jersey.server.mvc.freemarker.FreemarkerMvcFeature;
 
 public class ViewApplicationConfig extends ResourceConfig {
     
     public ViewApplicationConfig() {
         packages("com.baeldung.jersey.server");
+        property(ServerProperties.BV_SEND_ERROR_IN_RESPONSE, true);
         property(FreemarkerMvcFeature.TEMPLATE_BASE_PATH, "templates/freemarker");
         register(FreemarkerMvcFeature.class);;
     }

jersey/src/main/java/com/baeldung/jersey/server/constraints/SerialNumber.java

@@ -0,0 +1,35 @@
+package com.baeldung.jersey.server.constraints;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.util.regex.Pattern;
+
+import javax.validation.Constraint;
+import javax.validation.ConstraintValidator;
+import javax.validation.ConstraintValidatorContext;
+import javax.validation.Payload;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Constraint(validatedBy = { SerialNumber.Validator.class })
+public @interface SerialNumber {
+
+    String message()
+
+    default "Fruit serial number is not valid";
+
+    Class<?>[] groups() default {};
+
+    Class<? extends Payload>[] payload() default {};
+
+    public class Validator implements ConstraintValidator<SerialNumber, String> {
+        @Override
+        public void initialize(final SerialNumber serial) {
+        }
+
+        @Override
+        public boolean isValid(final String serial, final ConstraintValidatorContext constraintValidatorContext) {
+            final String serialNumRegex = "^\\d{3}-\\d{3}-\\d{4}$";
+            return Pattern.matches(serialNumRegex, serial);
+        }
+    }
+}

jersey/src/main/java/com/baeldung/jersey/server/model/Fruit.java

@@ -1,20 +1,57 @@
 package com.baeldung.jersey.server.model;
 
+import javax.validation.constraints.Min;
+import javax.validation.constraints.Size;
+import javax.xml.bind.annotation.XmlRootElement;
+
+@XmlRootElement
 public class Fruit {
 
-    private final String name;
-    private final String colour;
+    @Min(value = 10, message = "Fruit weight must be 10 or greater")
+    private Integer weight;
+    @Size(min = 5, max = 200)
+    private String name;
+    @Size(min = 5, max = 200)
+    private String colour;
+    private String serial;
+
+    public Fruit() {
+    }
 
     public Fruit(String name, String colour) {
         this.name = name;
         this.colour = colour;
     }
-    
+
     public String getName() {
         return name;
     }
+    
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public void setColour(String colour) {
+        this.colour = colour;
+    }
 
     public String getColour() {
         return colour;
     }
+
+    public Integer getWeight() {
+        return weight;
+    }
+
+    public void setWeight(Integer weight) {
+        this.weight = weight;
+    }
+    
+    public String getSerial() {
+        return serial;
+    }
+
+    public void setSerial(String serial) {
+        this.serial = serial;
+    }
 }

jersey/src/main/java/com/baeldung/jersey/server/providers/FruitExceptionMapper.java

@@ -0,0 +1,26 @@
+package com.baeldung.jersey.server.providers;
+
+import javax.validation.ConstraintViolation;
+import javax.validation.ConstraintViolationException;
+import javax.ws.rs.core.Response;
+import javax.ws.rs.ext.ExceptionMapper;
+
+public class FruitExceptionMapper implements ExceptionMapper<ConstraintViolationException> {
+
+    @Override
+    public Response toResponse(final ConstraintViolationException exception) {
+        return Response.status(Response.Status.BAD_REQUEST)
+            .entity(prepareMessage(exception))
+            .type("text/plain")
+            .build();
+    }
+
+    private String prepareMessage(ConstraintViolationException exception) {
+        final StringBuilder message = new StringBuilder();
+        for (ConstraintViolation<?> cv : exception.getConstraintViolations()) {
+            message.append(cv.getPropertyPath() + " " + cv.getMessage() + "\n");
+        }
+        return message.toString();
+    }
+
+}

jersey/src/main/java/com/baeldung/jersey/server/rest/FruitResource.java

@@ -5,7 +5,13 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
+import javax.validation.Valid;
+import javax.validation.constraints.NotNull;
+import javax.ws.rs.Consumes;
+import javax.ws.rs.FormParam;
 import javax.ws.rs.GET;
+import javax.ws.rs.POST;
+import javax.ws.rs.PUT;
 import javax.ws.rs.Path;
 import javax.ws.rs.PathParam;
 import javax.ws.rs.Produces;
@@ -15,7 +21,9 @@ import org.glassfish.jersey.server.mvc.ErrorTemplate;
 import org.glassfish.jersey.server.mvc.Template;
 import org.glassfish.jersey.server.mvc.Viewable;
 
+import com.baeldung.jersey.server.constraints.SerialNumber;
 import com.baeldung.jersey.server.model.Fruit;
+import com.baeldung.jersey.service.SimpleStorageService;
 
 @Path("/fruit")
 public class FruitResource {
@@ -52,4 +60,49 @@ public class FruitResource {
         return name;
     }
 
+    @POST
+    @Path("/create")
+    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
+    public void createFruit(
+        @NotNull(message = "Fruit name must not be null") @FormParam("name") String name, 
+        @NotNull(message = "Fruit colour must not be null") @FormParam("colour") String colour) {
+
+        Fruit fruit = new Fruit(name, colour);
+        SimpleStorageService.storeFruit(fruit);
+    }
+    
+    @PUT
+    @Path("/update")
+    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
+    public void updateFruit(@SerialNumber @FormParam("serial") String serial) {
+        Fruit fruit = new Fruit();
+        fruit.setSerial(serial);
+        SimpleStorageService.storeFruit(fruit);
+    }
+
+    @POST
+    @Path("/create")
+    @Consumes(MediaType.APPLICATION_JSON)
+    public void createFruit(@Valid Fruit fruit) {
+        SimpleStorageService.storeFruit(fruit);
+    }
+
+    @GET
+    @Valid
+    @Produces(MediaType.APPLICATION_JSON)
+    @Path("/search/{name}")
+    public Fruit findFruitByName(@PathParam("name") String name) {
+        return SimpleStorageService.findByName(name);
+    }
+
+    @GET
+    @Produces(MediaType.TEXT_HTML)
+    @Path("/exception")
+    @Valid
+    public Fruit exception() {
+        Fruit fruit = new Fruit();
+        fruit.setName("a");
+        fruit.setColour("b");
+        return fruit;
+    }
 }

jersey/src/main/java/com/baeldung/jersey/service/SimpleStorageService.java

@@ -0,0 +1,25 @@
+package com.baeldung.jersey.service;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import com.baeldung.jersey.server.model.Fruit;
+
+public class SimpleStorageService {
+
+    private static final Map<String, Fruit> fruits = new HashMap<String, Fruit>();
+
+    public static void storeFruit(final Fruit fruit) {
+        fruits.put(fruit.getName(), fruit);
+    }
+    
+    public static Fruit findByName(final String name) {
+        return fruits.entrySet()
+            .stream()
+            .filter(map -> name.equals(map.getKey()))
+            .map(map -> map.getValue())
+            .findFirst()
+            .get();
+    }
+
+}