diff --git a/src/main/java/com/amazonaws/App.java b/src/main/java/com/amazonaws/App.java
new file mode 100644
index 0000000..54bd72a
--- /dev/null
+++ b/src/main/java/com/amazonaws/App.java
@@ -0,0 +1,80 @@
+/*
+ * Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: MIT-0
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this
+ * software and associated documentation files (the "Software"), to deal in the Software
+ * without restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.company.sample.application;
+
+import software.amazon.awssdk.auth.credentials.DefaultCredentialsProvider;
+import software.amazon.codeguruprofilerjavaagent.Profiler;
+
+public class App {
+
+    public static void main(String[] args) {
+        // start the profiler
+        Profiler.builder().profilingGroupName("<insert the profiling group name here>")
+            .awsCredentialsProvider(DefaultCredentialsProvider.create())
+            .build()
+            .start();
+
+        App app = new App();
+
+        while(true){
+            app.load();
+            app.load1();
+            app.load2();
+        }
+    }
+
+    private void load() {
+        for (int i =0; i< 1 << 20; ++i){
+            computeShort();
+        }
+    }
+
+    private void load1(){
+        for (int i =0; i< 1 << 20; ++i){
+            computeMedium();
+        }
+    }
+
+    private void load2(){
+        for (int i =0; i< 1 << 20; ++i){
+            computeLong();
+        }
+    }
+
+    private void computeShort(){
+        long x = 0;
+        for (int i =0; i< 1 << 15; ++i){
+            x += i;
+        }
+    }
+
+    private void computeMedium(){
+        long x = 0;
+        for (int i =0; i< 1 << 17; ++i){
+            x += i;
+        }
+    }
+
+    private void computeLong(){
+        long x = 0;
+        for (int i =0; i< 1 << 18; ++i){
+            x += i;
+        }
+    }
+}
+
diff --git a/src/main/java/com/amazonaws/CreateIllegalOrderThread.java b/src/main/java/com/amazonaws/CreateIllegalOrderThread.java
new file mode 100644
index 0000000..fe5099d
--- /dev/null
+++ b/src/main/java/com/amazonaws/CreateIllegalOrderThread.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: MIT-0
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this
+ * software and associated documentation files (the "Software"), to deal in the Software
+ * without restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.company.sample.application;
+
+public class CreateIllegalOrderThread extends CreateOrderThread{
+
+    private volatile boolean exit = false;
+
+    public void run() {
+        while (!exit) {
+            //some illegal product names
+            createOrder("MANGO");
+            createOrder("STRAWBERRY");
+            createOrder("BANANA");
+            createOrder("GRAPE");
+            createOrder("CHERRY");
+        }
+
+    }
+}
+
diff --git a/src/main/java/com/amazonaws/CreateOrderThread.java b/src/main/java/com/amazonaws/CreateOrderThread.java
new file mode 100644
index 0000000..655a981
--- /dev/null
+++ b/src/main/java/com/amazonaws/CreateOrderThread.java
@@ -0,0 +1,72 @@
+/*
+ * Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: MIT-0
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this
+ * software and associated documentation files (the "Software"), to deal in the Software
+ * without restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.company.sample.application;
+
+import com.google.common.base.Optional;
+import java.util.Date;
+import java.util.Random;
+
+public class CreateOrderThread extends Thread{
+
+    static int id = 0;
+
+    private volatile boolean exit = false;
+
+    private static Random random = new Random();
+
+    public void run() {
+        while (!exit) {
+            createOrder("APPLE");
+            createOrder("ORANGE");
+            createOrder("PINEAPPLE");
+        }
+
+    }
+
+    /**
+     * Create random orders
+     * @param productName
+     */
+    public void createOrder(String productName){
+        try {
+            Date orderDate = Util.getRandomDate();
+            Optional<ProductName> optional = ProductName.getProductName(productName);
+
+            if (!optional.isPresent()) {
+                return;
+            }
+
+            ProductName enumProductName = optional.get();
+
+            Order order = new Order(enumProductName, orderDate, random.nextDouble() * 10000, id);
+
+			if (SalesSystem.orders.size() > 10000) {
+				SalesSystem.orders.clear();
+				id = 0;
+			}
+
+			SalesSystem.orders.put(orderDate, order);
+			id++;
+		} catch (IllegalArgumentException e){
+            //e.printStackTrace();
+            //not showing exception stack trace here because it will wash away Profiler's running log
+        }
+    }
+
+}
+
diff --git a/src/main/java/com/amazonaws/ListOrderThread.java b/src/main/java/com/amazonaws/ListOrderThread.java
new file mode 100644
index 0000000..588f487
--- /dev/null
+++ b/src/main/java/com/amazonaws/ListOrderThread.java
@@ -0,0 +1,81 @@
+/*
+ * Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: MIT-0
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this
+ * software and associated documentation files (the "Software"), to deal in the Software
+ * without restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.company.sample.application;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import java.text.DateFormat;
+import java.text.DateFormatSymbols;
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+
+public class ListOrderThread extends Thread {
+    private volatile boolean exit = false;
+
+    /**
+     * Resolution: uncomment the following line to see how this improves the profile.
+     */
+//    private  static DateFormatSymbols dateFormatSymbols = DateFormatSymbols.getInstance();
+//    private  static DateFormat myFormat = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss z", dateFormatSymbols);
+//    private  static DateFormat todayFormat = new SimpleDateFormat("dd MMM yyyy", dateFormatSymbols);
+    /**
+     * Here DateFormatSymbols are not provided to the SimpleDateFormat
+     * constructor and it will look up on every call, comment the below two lines
+     */
+    private static DateFormat myFormat = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss z");
+    private static DateFormat todayFormat = new SimpleDateFormat("dd MMM yyyy");
+
+    private static String today = null;
+
+    @Override
+    public void run() {
+        while (!exit) {
+            listOrders();
+
+        }
+    }
+
+    /**
+     * List the same day orders
+     */
+    private void listOrders(){
+        ObjectMapper objectMapper = new ObjectMapper();
+
+        synchronized (SalesSystem.orders) {
+            for(Date orderDate: SalesSystem.orders.keySet()){
+                try {
+                    objectMapper.setDateFormat(myFormat);
+                    Date todayDate = todayFormat.parse(this.today);
+                    if(Util.isSameDay(orderDate, todayDate)) {
+                        String orderAsString = objectMapper.writeValueAsString(SalesSystem.orders.get(orderDate));
+                    }
+                } catch (JsonProcessingException e) {
+                    e.printStackTrace();
+                } catch (ParseException e) {
+                    e.printStackTrace();
+                }
+            }
+        }
+    }
+
+    public void setDate(String today){
+        this.today = today;
+    }
+}
+
diff --git a/src/main/java/com/amazonaws/Order.java b/src/main/java/com/amazonaws/Order.java
new file mode 100644
index 0000000..507b3a0
--- /dev/null
+++ b/src/main/java/com/amazonaws/Order.java
@@ -0,0 +1,67 @@
+/*
+ * Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: MIT-0
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this
+ * software and associated documentation files (the "Software"), to deal in the Software
+ * without restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.company.sample.application;
+
+import java.util.Date;
+
+public class Order {
+    private ProductName productName;
+    private Date salesDate;
+    private double amount;
+    private int orderId;
+
+    public Order(ProductName productName, Date salesDate, double amount, int orderId) {
+        this.productName = productName;
+        this.salesDate = salesDate;
+        this.amount = amount;
+        this.orderId = orderId;
+    }
+
+    public ProductName getProductName() {
+        return productName;
+    }
+
+    public void setProductName(ProductName productName) {
+        this.productName = productName;
+    }
+
+    public Date getSalesDate() {
+        return salesDate;
+    }
+
+    public void setSalesDate(Date salesDate) {
+        this.salesDate = salesDate;
+    }
+
+    public double getAmount() {
+        return amount;
+    }
+
+    public void setAmount(double amount) {
+        this.amount = amount;
+    }
+
+    public int getOrderId() {
+        return orderId;
+    }
+
+    public void setOrderId(int orderId) {
+        this.orderId = orderId;
+    }
+}
+
diff --git a/src/main/java/com/amazonaws/ProductName.java b/src/main/java/com/amazonaws/ProductName.java
new file mode 100644
index 0000000..9eb2695
--- /dev/null
+++ b/src/main/java/com/amazonaws/ProductName.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: MIT-0
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this
+ * software and associated documentation files (the "Software"), to deal in the Software
+ * without restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.company.sample.application;
+
+import com.google.common.base.Enums;
+
+import com.google.common.base.Optional;
+
+public enum ProductName{
+
+    APPLE, ORANGE, PINEAPPLE;
+
+    /**
+     * Pick a random value of the ProductName enum.
+     * @return a random ProductName.
+     */
+    public static Optional<ProductName> getProductName(String name) {
+        /**
+         * Here is attempting to parse a value in the enum, if the value is not found in the enum,
+         * it results in an exception being thrown, comment the below two lines to fix it and uncomment line 43
+         */
+        ProductName productName = ProductName.valueOf(name);
+        return Optional.of(productName);
+
+        /**
+         * Resolution: uncomment the following line to see how this improves the profile.
+         */
+//        return Enums.getIfPresent(ProductName.class, name);
+    }
+}
+
diff --git a/src/main/java/com/amazonaws/SalesSystem.java b/src/main/java/com/amazonaws/SalesSystem.java
new file mode 100644
index 0000000..a404606
--- /dev/null
+++ b/src/main/java/com/amazonaws/SalesSystem.java
@@ -0,0 +1,59 @@
+/*
+ * Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: MIT-0
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this
+ * software and associated documentation files (the "Software"), to deal in the Software
+ * without restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.company.sample.application;
+
+import software.amazon.awssdk.auth.credentials.DefaultCredentialsProvider;
+import software.amazon.codeguruprofilerjavaagent.Profiler;
+
+import java.text.DateFormat;
+import java.text.SimpleDateFormat;
+
+import java.util.Date;
+import java.util.concurrent.ConcurrentHashMap;
+
+public class SalesSystem {
+
+    public static ConcurrentHashMap<Date, Order> orders = new ConcurrentHashMap<Date, Order>();
+
+    public static void main(String[] args) {
+        //Start the profiler
+        Profiler systemProfiler =
+            Profiler.builder().profilingGroupName("<Insert the profiling group name here>")
+            .awsCredentialsProvider(DefaultCredentialsProvider.create())
+            .build();
+
+        systemProfiler.start();
+
+        //Start create order thread
+        CreateOrderThread createOrderThread = new CreateOrderThread();
+        createOrderThread.start();
+
+        //Start create Illegal order thread
+        CreateIllegalOrderThread createIllegalOrderThread = new CreateIllegalOrderThread();
+        createIllegalOrderThread.start();
+
+        //Start list order thread
+        ListOrderThread listOrderThread = new ListOrderThread();
+
+        DateFormat currentDateFormat = new SimpleDateFormat("dd MMM yyyy");
+        listOrderThread.setDate(currentDateFormat.format(new Date()));
+
+        listOrderThread.start();
+    }
+}
+
diff --git a/src/main/java/com/amazonaws/Util.java b/src/main/java/com/amazonaws/Util.java
new file mode 100644
index 0000000..c223eef
--- /dev/null
+++ b/src/main/java/com/amazonaws/Util.java
@@ -0,0 +1,68 @@
+/*
+ * Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: MIT-0
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this
+ * software and associated documentation files (the "Software"), to deal in the Software
+ * without restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.company.sample.application;
+
+import java.util.Calendar;
+import java.util.Date;
+import java.util.GregorianCalendar;
+
+public class Util {
+    /**
+     * generate a random date in this year
+     * @return
+     */
+    public static Date getRandomDate(){
+
+        GregorianCalendar gc = new GregorianCalendar();
+
+        int dayOfYear = randBetween(1, gc.getActualMaximum(gc.DAY_OF_YEAR));
+
+        gc.set(gc.DAY_OF_YEAR, dayOfYear);
+
+        return gc.getTime();
+    }
+
+    /**
+     * get a random number between start and end
+     * @param start
+     * @param end
+     * @return
+     */
+    public static int randBetween(int start, int end) {
+        return start + (int)Math.round(Math.random() * (end - start));
+    }
+
+    /**
+     * Judge two dates are in the same day
+     * @param date1
+     * @param date2
+     * @return
+     */
+    public static boolean isSameDay(Date date1, Date date2) {
+        if(date1 == null && date2 == null) {
+            throw new IllegalArgumentException("The date must not be null");
+        }
+        //logic to compare the dates and return boolean.
+        Calendar cal1 = Calendar.getInstance();
+        Calendar cal2 = Calendar.getInstance();
+        cal1.setTime(date1);
+        cal2.setTime(date2);
+        return cal1.get(Calendar.DAY_OF_YEAR) == cal2.get(Calendar.DAY_OF_YEAR) && cal1.get(Calendar.YEAR) == cal2.get(Calendar.YEAR);
+    }
+}
+