BAEL-1277: RESTFul CRUD application with JavaLite (#3359)

* BAEL-1277: RESTFul CRUD application with JavaLite.

* BAEL-1277: RESTFul CRUD application with JavaLite. Adding exception handling.

java-lite/src/main/java/app/config/AppBootstrap.java

@@ -0,0 +1,9 @@
+package app.config;
+
+import org.javalite.activeweb.AppContext;
+import org.javalite.activeweb.Bootstrap;
+
+public class AppBootstrap extends Bootstrap {
+    public void init(AppContext context) {
+    }
+}

java-lite/src/main/java/app/config/AppControllerConfig.java

@@ -0,0 +1,15 @@
+package app.config;
+
+import app.controllers.ProductsController;
+import org.javalite.activeweb.AbstractControllerConfig;
+import org.javalite.activeweb.AppContext;
+import org.javalite.activeweb.controller_filters.DBConnectionFilter;
+import org.javalite.activeweb.controller_filters.TimingFilter;
+
+public class AppControllerConfig extends AbstractControllerConfig {
+    @Override
+    public void init(AppContext appContext) {
+      addGlobalFilters(new TimingFilter());
+      add(new DBConnectionFilter()).to(ProductsController.class);
+    }
+}

java-lite/src/main/java/app/config/DbConfig.java

@@ -0,0 +1,11 @@
+package app.config;
+
+import org.javalite.activeweb.AbstractDBConfig;
+import org.javalite.activeweb.AppContext;
+
+public class DbConfig extends AbstractDBConfig {
+    @Override
+    public void init(AppContext appContext) {
+      this.configFile("/database.properties");
+    }
+}

java-lite/src/main/java/app/controllers/ProductsController.java

@@ -0,0 +1,101 @@
+package app.controllers;
+
+import app.models.Product;
+import org.codehaus.jackson.map.ObjectMapper;
+import org.javalite.activeweb.AppController;
+import org.javalite.activeweb.annotations.RESTful;
+
+import java.util.Map;
+
+@RESTful
+public class ProductsController extends AppController {
+
+    public void index() {
+      try {
+        view("products", Product.findAll());
+        render().contentType("application/json");
+      } catch (Exception e) {
+        view("message", "There was an error.", "code", 200);
+        render("message");
+      }
+    }
+
+    public void create() {
+      try {
+        Map payload = new ObjectMapper().readValue(getRequestString(), Map.class);
+        Product p = new Product();
+        p.fromMap(payload);
+        p.saveIt();
+        view("message", "Successfully saved product id " + p.get("id"), "code", 200);
+        render("message");
+      } catch (Exception e) {
+        view("message", "There was an error.", "code", 200);
+        render("message");
+      }
+    }
+
+    public void update() {
+      try {
+        Map payload = new ObjectMapper().readValue(getRequestString(), Map.class);
+        String id = getId();
+        Product p = Product.findById(id);
+        if (p == null) {
+          view("message", "Product id " + id + " not found.", "code", 200);
+          render("message");
+          return;
+        }
+        p.fromMap(payload);
+        p.saveIt();
+        view("message", "Successfully updated product id " + id, "code", 200);
+        render("message");
+      } catch (Exception e) {
+        view("message", "There was an error.", "code", 200);
+        render("message");
+      }
+    }
+
+    public void show() {
+      try {
+        String id = getId();
+        Product p = Product.findById(id);
+        if (p == null) {
+          view("message", "Product id " + id + " not found.", "code", 200);
+          render("message");
+          return;
+        }
+        view("product", p);
+        render("_product");
+      } catch (Exception e) {
+        view("message", "There was an error.", "code", 200);
+        render("message");
+      }
+    }
+
+    public void destroy() {
+      try {
+        String id = getId();
+        Product p = Product.findById(id);
+        if (p == null) {
+          view("message", "Product id " + id + " not found.", "code", 200);
+          render("message");
+          return;
+        }
+        p.delete();
+        view("message", "Successfully deleted product id " + id, "code", 200);
+        render("message");
+      } catch (Exception e) {
+        view("message", "There was an error.", "code", 200);
+        render("message");
+      }
+    }
+
+    @Override
+    protected String getContentType() {
+      return "application/json";
+    }
+
+    @Override
+    protected String getLayout() {
+      return null;
+    }
+}

java-lite/src/main/java/app/models/Product.java

@@ -0,0 +1,7 @@
+package app.models;
+
+import org.javalite.activejdbc.Model;
+
+public class Product extends Model {
+
+}