{"id":322,"date":"2025-11-29T05:55:00","date_gmt":"2025-11-29T05:55:00","guid":{"rendered":"https:\/\/harshad-sonawane.com\/blog\/?p=322"},"modified":"2025-11-15T16:54:45","modified_gmt":"2025-11-15T16:54:45","slug":"integrating-aws-sqs-sns-java-applications","status":"publish","type":"post","link":"https:\/\/harshad-sonawane.com\/blog\/integrating-aws-sqs-sns-java-applications\/","title":{"rendered":"Integrating AWS SQS and SNS in Java Applications for Reliable Messaging"},"content":{"rendered":"<p data-start=\"373\" data-end=\"716\">Modern <a href=\"https:\/\/harshad-sonawane.com\/blog\/java-microservices-vs-go-microservices-when-to-choose-what\/\">distributed systems<\/a> rely heavily on asynchronous communication to maintain resilience, scalability, and fault isolation. <a href=\"https:\/\/harshad-sonawane.com\/blog\/choosing-right-cloud-database-rds-dynamodb-aurora-documentdb\/\">AWS<\/a> offers two widely adopted managed messaging services\u2014<strong data-start=\"558\" data-end=\"595\">Amazon Simple Queue Service (SQS)<\/strong> and <strong data-start=\"600\" data-end=\"644\">Amazon Simple Notification Service (SNS)<\/strong>\u2014that simplify building event-driven architectures in <a href=\"https:\/\/harshad-sonawane.com\/blog\/reduce-cloud-costs-java-applications\/\">Java<\/a> applications.<\/p>\n<p data-start=\"718\" data-end=\"999\">SNS enables <strong data-start=\"730\" data-end=\"751\">pub\/sub messaging<\/strong> with multiple subscribers, while SQS provides a <strong data-start=\"800\" data-end=\"829\">reliable, decoupled queue<\/strong> for processing messages at scale. When combined, they form a powerful pattern that ensures messages are delivered reliably even under high load or microservice failures.<\/p>\n<p data-start=\"1001\" data-end=\"1167\">This guide walks through the concepts, design patterns, and hands-on Java examples to help you seamlessly integrate SQS and SNS within a production-ready application.<\/p>\n<hr data-start=\"1169\" data-end=\"1172\" \/>\n<h2 data-start=\"1174\" data-end=\"1212\">Why Use Messaging with SQS and SNS?<\/h2>\n<p data-start=\"1214\" data-end=\"1382\">Modern applications need to be resilient against failures, slow processing, and traffic spikes. Messaging solves these challenges by decoupling producers and consumers.<\/p>\n<h3 data-start=\"1384\" data-end=\"1400\">Key Benefits<\/h3>\n<h3 data-start=\"1401\" data-end=\"1423\"><strong data-start=\"1405\" data-end=\"1423\">1. Reliability<\/strong><\/h3>\n<p data-start=\"1424\" data-end=\"1494\">Messages are never lost because SQS persists them across multiple AZs.<\/p>\n<h3 data-start=\"1496\" data-end=\"1518\"><strong data-start=\"1500\" data-end=\"1518\">2. Scalability<\/strong><\/h3>\n<p data-start=\"1519\" data-end=\"1567\">Consumers can scale independently based on load.<\/p>\n<h3 data-start=\"1569\" data-end=\"1594\"><strong data-start=\"1573\" data-end=\"1594\">3. Loose Coupling<\/strong><\/h3>\n<p data-start=\"1595\" data-end=\"1676\">SNS broadcasts messages to multiple downstream systems without tight integration.<\/p>\n<h3 data-start=\"1678\" data-end=\"1708\"><strong data-start=\"1682\" data-end=\"1708\">4. Event-Driven Design<\/strong><\/h3>\n<p data-start=\"1709\" data-end=\"1765\">Enables <a href=\"https:\/\/harshad-sonawane.com\/blog\/build-high-performance-java-apis-using-grpc\/\">microservices<\/a> to react to events asynchronously.<\/p>\n<h3 data-start=\"1767\" data-end=\"1793\"><strong data-start=\"1771\" data-end=\"1793\">5. Cost Efficiency<\/strong><\/h3>\n<p data-start=\"1794\" data-end=\"1838\">Pay only for requests; no servers to manage.<\/p>\n<hr data-start=\"1840\" data-end=\"1843\" \/>\n<h1 data-start=\"1845\" data-end=\"1872\">Understanding SNS and SQS<\/h1>\n<h2 data-start=\"1874\" data-end=\"1923\"><strong data-start=\"1877\" data-end=\"1921\">Amazon SNS (Simple Notification Service)<\/strong><\/h2>\n<p data-start=\"1924\" data-end=\"1979\">SNS acts as a message broker for fan-out communication.<\/p>\n<h3 data-start=\"1981\" data-end=\"1995\">Use Cases:<\/h3>\n<ul data-start=\"1996\" data-end=\"2140\">\n<li data-start=\"1996\" data-end=\"2018\">\n<p data-start=\"1998\" data-end=\"2018\">Event broadcasting<\/p>\n<\/li>\n<li data-start=\"2019\" data-end=\"2055\">\n<p data-start=\"2021\" data-end=\"2055\">Notifying multiple microservices<\/p>\n<\/li>\n<li data-start=\"2056\" data-end=\"2090\">\n<p data-start=\"2058\" data-end=\"2090\">Triggering SMS or email alerts<\/p>\n<\/li>\n<li data-start=\"2091\" data-end=\"2140\">\n<p data-start=\"2093\" data-end=\"2140\">Fan-out architecture with multiple SQS queues<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"2142\" data-end=\"2199\">SNS transports messages but doesn\u2019t store them long-term.<\/p>\n<hr data-start=\"2201\" data-end=\"2204\" \/>\n<h2 data-start=\"2206\" data-end=\"2248\"><strong data-start=\"2209\" data-end=\"2246\">Amazon SQS (Simple Queue Service)<\/strong><\/h2>\n<p data-start=\"2249\" data-end=\"2289\">SQS is a durable message queue offering:<\/p>\n<ul data-start=\"2290\" data-end=\"2401\">\n<li data-start=\"2290\" data-end=\"2316\">\n<p data-start=\"2292\" data-end=\"2316\">At-least-once delivery<\/p>\n<\/li>\n<li data-start=\"2317\" data-end=\"2339\">\n<p data-start=\"2319\" data-end=\"2339\">Visibility timeout<\/p>\n<\/li>\n<li data-start=\"2340\" data-end=\"2368\">\n<p data-start=\"2342\" data-end=\"2368\">Dead-letter queues (DLQ)<\/p>\n<\/li>\n<li data-start=\"2369\" data-end=\"2401\">\n<p data-start=\"2371\" data-end=\"2401\">FIFO or Standard queue types<\/p>\n<\/li>\n<\/ul>\n<h3 data-start=\"2403\" data-end=\"2417\">Use Cases:<\/h3>\n<ul data-start=\"2418\" data-end=\"2526\">\n<li data-start=\"2418\" data-end=\"2445\">\n<p data-start=\"2420\" data-end=\"2445\">Asynchronous processing<\/p>\n<\/li>\n<li data-start=\"2446\" data-end=\"2465\">\n<p data-start=\"2448\" data-end=\"2465\">Background jobs<\/p>\n<\/li>\n<li data-start=\"2466\" data-end=\"2494\">\n<p data-start=\"2468\" data-end=\"2494\">Decoupling microservices<\/p>\n<\/li>\n<li data-start=\"2495\" data-end=\"2526\">\n<p data-start=\"2497\" data-end=\"2526\">Retries and error isolation<\/p>\n<\/li>\n<\/ul>\n<hr data-start=\"2528\" data-end=\"2531\" \/>\n<h1 data-start=\"2533\" data-end=\"2560\">SNS \u2192 SQS Fan-Out Pattern<\/h1>\n<p data-start=\"2562\" data-end=\"2632\">The most common architectural pattern integrates SNS and SQS together.<\/p>\n<div class=\"contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary\">\n<div class=\"sticky top-9\">\n<div class=\"absolute end-0 bottom-0 flex h-9 items-center pe-2\">\n<div class=\"bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs\"><\/div>\n<\/div>\n<\/div>\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"whitespace-pre!\"><span><span class=\"hljs-attribute\">Producer<\/span> \u2192 SNS Topic \u2192 Multiple SQS Queues \u2192 Service Consumers<br \/>\n<\/span><\/code><\/div>\n<\/div>\n<p data-start=\"2706\" data-end=\"2717\">Advantages:<\/p>\n<ul data-start=\"2718\" data-end=\"2862\">\n<li data-start=\"2718\" data-end=\"2768\">\n<p data-start=\"2720\" data-end=\"2768\">Producers remain independent of consumer logic<\/p>\n<\/li>\n<li data-start=\"2769\" data-end=\"2821\">\n<p data-start=\"2771\" data-end=\"2821\">Multiple consumers process the same event stream<\/p>\n<\/li>\n<li data-start=\"2822\" data-end=\"2862\">\n<p data-start=\"2824\" data-end=\"2862\">Built-in retry &amp; durability with SQS<\/p>\n<\/li>\n<\/ul>\n<hr data-start=\"2864\" data-end=\"2867\" \/>\n<h1 data-start=\"2869\" data-end=\"2908\">Integrating SNS in a Java Application<\/h1>\n<p data-start=\"2910\" data-end=\"2966\">Below is a clean example using AWS SDK v2 (recommended).<\/p>\n<h3 data-start=\"2968\" data-end=\"2995\"><strong data-start=\"2972\" data-end=\"2995\">1. Maven Dependency<\/strong><\/h3>\n<div class=\"contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary\">\n<div class=\"sticky top-9\">\n<div class=\"absolute end-0 bottom-0 flex h-9 items-center pe-2\">\n<div class=\"bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs\"><\/div>\n<\/div>\n<\/div>\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"whitespace-pre! language-xml\"><span><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">dependency<\/span><\/span>&gt;<br \/>\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">groupId<\/span><\/span>&gt;software.amazon.awssdk<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">groupId<\/span><\/span>&gt;<br \/>\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">artifactId<\/span><\/span>&gt;sns<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">artifactId<\/span><\/span>&gt;<br \/>\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">version<\/span><\/span>&gt;2.25.0<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">version<\/span><\/span>&gt;<br \/>\n<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">dependency<\/span><\/span>&gt;<br \/>\n<\/span><\/code><\/div>\n<\/div>\n<hr data-start=\"3145\" data-end=\"3148\" \/>\n<h3 data-start=\"3150\" data-end=\"3187\"><strong data-start=\"3154\" data-end=\"3187\">2. Publishing Messages to SNS<\/strong><\/h3>\n<div class=\"contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary\">\n<div class=\"sticky top-9\">\n<div class=\"absolute end-0 bottom-0 flex h-9 items-center pe-2\">\n<div class=\"bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs\"><\/div>\n<\/div>\n<\/div>\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"whitespace-pre! language-java\"><code class=\"whitespace-pre! language-java\"><span><span class=\"hljs-keyword\">import<\/span> software.amazon.awssdk.services.sns.SnsClient;<br \/>\n<span class=\"hljs-keyword\">import<\/span> software.amazon.awssdk.services.sns.model.PublishRequest;<\/span><\/code><\/code>\n<p><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">SnsPublisher<\/span> {<\/p>\n<code class=\"whitespace-pre! language-java\"><code class=\"whitespace-pre! language-java\"><span><\/span><\/code><\/code>\n<p><span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">final<\/span> SnsClient snsClient;<br \/><span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">final<\/span> String topicArn;<\/p>\n<code class=\"whitespace-pre! language-java\"><code class=\"whitespace-pre! language-java\"><span><\/span><\/code><\/code>\n<p><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-title function_\">SnsPublisher<\/span><span class=\"hljs-params\">(String topicArn)<\/span> {<br \/><span class=\"hljs-built_in\">this<\/span>.snsClient = SnsClient.builder().build();<br \/><span class=\"hljs-built_in\">this<\/span>.topicArn = topicArn;<br \/>}<\/p>\n<code class=\"whitespace-pre! language-java\"><code class=\"whitespace-pre! language-java\"><span><\/span><\/code><\/code>\n<p><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">publishMessage<\/span><span class=\"hljs-params\">(String message)<\/span> {<br \/><span class=\"hljs-type\">PublishRequest<\/span> <span class=\"hljs-variable\">request<\/span> <span class=\"hljs-operator\">=<\/span> PublishRequest.builder()<br \/>.message(message)<br \/>.topicArn(topicArn)<br \/>.build();<\/p>\n<code class=\"whitespace-pre! language-java\"><code class=\"whitespace-pre! language-java\"><span><\/span><\/code><\/code>\n<p>snsClient.publish(request);<br \/>System.out.println(<span class=\"hljs-string\">&#8220;Message published to SNS: &#8220;<\/span> + message);<br \/>}<br \/>}<\/p>\n<\/div>\n<\/div>\n<hr data-start=\"3880\" data-end=\"3883\" \/>\n<h1 data-start=\"3885\" data-end=\"3923\">Integrating SQS in Java Applications<\/h1>\n<h3 data-start=\"3925\" data-end=\"3954\"><strong data-start=\"3929\" data-end=\"3954\">1. Add SQS Dependency<\/strong><\/h3>\n<div class=\"contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary\">\n<div class=\"sticky top-9\">\n<div class=\"absolute end-0 bottom-0 flex h-9 items-center pe-2\">\n<div class=\"bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs\"><\/div>\n<\/div>\n<\/div>\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"whitespace-pre! language-xml\"><span><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">dependency<\/span><\/span>&gt;<br \/>\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">groupId<\/span><\/span>&gt;software.amazon.awssdk<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">groupId<\/span><\/span>&gt;<br \/>\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">artifactId<\/span><\/span>&gt;sqs<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">artifactId<\/span><\/span>&gt;<br \/>\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">version<\/span><\/span>&gt;2.25.0<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">version<\/span><\/span>&gt;<br \/>\n<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">dependency<\/span><\/span>&gt;<br \/>\n<\/span><\/code><\/div>\n<\/div>\n<hr data-start=\"4104\" data-end=\"4107\" \/>\n<h3 data-start=\"4109\" data-end=\"4145\"><strong data-start=\"4113\" data-end=\"4145\">2. Polling Messages from SQS<\/strong><\/h3>\n<div class=\"contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary\">\n<div class=\"sticky top-9\">\n<div class=\"absolute end-0 bottom-0 flex h-9 items-center pe-2\">\n<div class=\"bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs\"><\/div>\n<\/div>\n<\/div>\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"whitespace-pre! language-java\"><code class=\"whitespace-pre! language-java\"><span><span class=\"hljs-keyword\">import<\/span> software.amazon.awssdk.services.sqs.SqsClient;<br \/>\n<span class=\"hljs-keyword\">import<\/span> software.amazon.awssdk.services.sqs.model.*;<\/span><\/code><\/code>\n<p><span class=\"hljs-keyword\">import<\/span> java.util.List;<\/p>\n<code class=\"whitespace-pre! language-java\"><code class=\"whitespace-pre! language-java\"><span><\/span><\/code><\/code>\n<p><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">SqsConsumer<\/span> {<\/p>\n<code class=\"whitespace-pre! language-java\"><code class=\"whitespace-pre! language-java\"><span><\/span><\/code><\/code>\n<p><span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">final<\/span> SqsClient sqsClient;<br \/><span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">final<\/span> String queueUrl;<\/p>\n<code class=\"whitespace-pre! language-java\"><code class=\"whitespace-pre! language-java\"><span><\/span><\/code><\/code>\n<p><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-title function_\">SqsConsumer<\/span><span class=\"hljs-params\">(String queueUrl)<\/span> {<br \/><span class=\"hljs-built_in\">this<\/span>.sqsClient = SqsClient.builder().build();<br \/><span class=\"hljs-built_in\">this<\/span>.queueUrl = queueUrl;<br \/>}<\/p>\n<code class=\"whitespace-pre! language-java\"><code class=\"whitespace-pre! language-java\"><span><\/span><\/code><\/code>\n<p><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">receiveMessages<\/span><span class=\"hljs-params\">()<\/span> {<br \/><span class=\"hljs-type\">ReceiveMessageRequest<\/span> <span class=\"hljs-variable\">request<\/span> <span class=\"hljs-operator\">=<\/span> ReceiveMessageRequest.builder()<br \/>.queueUrl(queueUrl)<br \/>.waitTimeSeconds(<span class=\"hljs-number\">10<\/span>)<br \/>.maxNumberOfMessages(<span class=\"hljs-number\">5<\/span>)<br \/>.build();<\/p>\n<code class=\"whitespace-pre! language-java\"><code class=\"whitespace-pre! language-java\"><span><\/span><\/code><\/code>\n<p>List&lt;Message&gt; messages = sqsClient.receiveMessage(request).messages();<\/p>\n<code class=\"whitespace-pre! language-java\"><code class=\"whitespace-pre! language-java\"><span><\/span><\/code><\/code>\n<p><span class=\"hljs-keyword\">for<\/span> (Message message : messages) {<br \/>System.out.println(<span class=\"hljs-string\">&#8220;Received message: &#8220;<\/span> + message.body());<br \/>processMessage(message);<br \/>deleteMessage(message);<br \/>}<br \/>}<\/p>\n<code class=\"whitespace-pre! language-java\"><code class=\"whitespace-pre! language-java\"><span><\/span><\/code><\/code>\n<p><span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">deleteMessage<\/span><span class=\"hljs-params\">(Message message)<\/span> {<br \/><span class=\"hljs-type\">DeleteMessageRequest<\/span> <span class=\"hljs-variable\">deleteRequest<\/span> <span class=\"hljs-operator\">=<\/span> DeleteMessageRequest.builder()<br \/>.queueUrl(queueUrl)<br \/>.receiptHandle(message.receiptHandle())<br \/>.build();<\/p>\n<code class=\"whitespace-pre! language-java\"><code class=\"whitespace-pre! language-java\"><span><\/span><\/code><\/code>\n<p>sqsClient.deleteMessage(deleteRequest);<br \/>}<\/p>\n<code class=\"whitespace-pre! language-java\"><code class=\"whitespace-pre! language-java\"><span><\/span><\/code><\/code>\n<p><span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">processMessage<\/span><span class=\"hljs-params\">(Message message)<\/span> {<br \/><span class=\"hljs-comment\">\/\/ Custom business logic here<\/span><br \/>}<br \/>}<\/p>\n<\/div>\n<\/div>\n<hr data-start=\"5460\" data-end=\"5463\" \/>\n<h1 data-start=\"5465\" data-end=\"5500\">Setting Up SNS \u2192 SQS Subscription<\/h1>\n<h3 data-start=\"5502\" data-end=\"5512\">Steps:<\/h3>\n<ol data-start=\"5513\" data-end=\"5648\">\n<li data-start=\"5513\" data-end=\"5537\">\n<p data-start=\"5516\" data-end=\"5537\">Create an SNS topic<\/p>\n<\/li>\n<li data-start=\"5538\" data-end=\"5562\">\n<p data-start=\"5541\" data-end=\"5562\">Create an SQS queue<\/p>\n<\/li>\n<li data-start=\"5563\" data-end=\"5606\">\n<p data-start=\"5566\" data-end=\"5606\">Grant SNS permission to publish to SQS<\/p>\n<\/li>\n<li data-start=\"5607\" data-end=\"5648\">\n<p data-start=\"5610\" data-end=\"5648\">Subscribe the SQS queue to the topic<\/p>\n<\/li>\n<\/ol>\n<h3 data-start=\"5650\" data-end=\"5686\">Example Permission Policy on SQS<\/h3>\n<div class=\"contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary\">\n<div class=\"sticky top-9\">\n<div class=\"absolute end-0 bottom-0 flex h-9 items-center pe-2\">\n<div class=\"bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs\"><\/div>\n<\/div>\n<\/div>\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"whitespace-pre! language-json\"><span><span class=\"hljs-punctuation\">{<\/span><br \/>\n  <span class=\"hljs-attr\">\"Version\"<\/span><span class=\"hljs-punctuation\">:<\/span> <span class=\"hljs-string\">\"2012-10-17\"<\/span><span class=\"hljs-punctuation\">,<\/span><br \/>\n  <span class=\"hljs-attr\">\"Statement\"<\/span><span class=\"hljs-punctuation\">:<\/span> <span class=\"hljs-punctuation\">[<\/span><br \/>\n    <span class=\"hljs-punctuation\">{<\/span><br \/>\n      <span class=\"hljs-attr\">\"Effect\"<\/span><span class=\"hljs-punctuation\">:<\/span> <span class=\"hljs-string\">\"Allow\"<\/span><span class=\"hljs-punctuation\">,<\/span><br \/>\n      <span class=\"hljs-attr\">\"Principal\"<\/span><span class=\"hljs-punctuation\">:<\/span> <span class=\"hljs-string\">\"*\"<\/span><span class=\"hljs-punctuation\">,<\/span><br \/>\n      <span class=\"hljs-attr\">\"Action\"<\/span><span class=\"hljs-punctuation\">:<\/span> <span class=\"hljs-string\">\"sqs:SendMessage\"<\/span><span class=\"hljs-punctuation\">,<\/span><br \/>\n      <span class=\"hljs-attr\">\"Resource\"<\/span><span class=\"hljs-punctuation\">:<\/span> <span class=\"hljs-string\">\"arn:aws:sqs:us-east-1:123456789012:order-queue\"<\/span><span class=\"hljs-punctuation\">,<\/span><br \/>\n      <span class=\"hljs-attr\">\"Condition\"<\/span><span class=\"hljs-punctuation\">:<\/span> <span class=\"hljs-punctuation\">{<\/span><br \/>\n        <span class=\"hljs-attr\">\"ArnEquals\"<\/span><span class=\"hljs-punctuation\">:<\/span> <span class=\"hljs-punctuation\">{<\/span><br \/>\n          <span class=\"hljs-attr\">\"aws:SourceArn\"<\/span><span class=\"hljs-punctuation\">:<\/span> <span class=\"hljs-string\">\"arn:aws:sns:us-east-1:123456789012:order-topic\"<\/span><br \/>\n        <span class=\"hljs-punctuation\">}<\/span><br \/>\n      <span class=\"hljs-punctuation\">}<\/span><br \/>\n    <span class=\"hljs-punctuation\">}<\/span><br \/>\n  <span class=\"hljs-punctuation\">]<\/span><br \/>\n<span class=\"hljs-punctuation\">}<\/span><br \/>\n<\/span><\/code><\/div>\n<\/div>\n<hr data-start=\"6055\" data-end=\"6058\" \/>\n<h1 data-start=\"6060\" data-end=\"6109\">Handling Failures with Dead-Letter Queues (DLQ)<\/h1>\n<p data-start=\"6111\" data-end=\"6165\">A DLQ stores messages that fail processing repeatedly.<\/p>\n<h3 data-start=\"6167\" data-end=\"6191\">Recommended Settings<\/h3>\n<ul data-start=\"6192\" data-end=\"6293\">\n<li data-start=\"6192\" data-end=\"6224\">\n<p data-start=\"6194\" data-end=\"6224\"><strong data-start=\"6194\" data-end=\"6222\">maxReceiveCount = 3 or 5<\/strong><\/p>\n<\/li>\n<li data-start=\"6225\" data-end=\"6252\">\n<p data-start=\"6227\" data-end=\"6252\">Monitor DLQ with alarms<\/p>\n<\/li>\n<li data-start=\"6253\" data-end=\"6293\">\n<p data-start=\"6255\" data-end=\"6293\">Periodically inspect failed messages<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"6295\" data-end=\"6346\">DLQs make systems fault-tolerant without data loss.<\/p>\n<hr data-start=\"6348\" data-end=\"6351\" \/>\n<h1 data-start=\"6353\" data-end=\"6378\">FIFO or Standard Queue?<\/h1>\n<div class=\"_tableContainer_1rjym_1\">\n<div class=\"group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse\" tabindex=\"-1\">\n<table data-start=\"6380\" data-end=\"6534\" class=\"w-fit min-w-(--thread-content-width)\">\n<thead data-start=\"6380\" data-end=\"6405\">\n<tr data-start=\"6380\" data-end=\"6405\">\n<th data-start=\"6380\" data-end=\"6393\" data-col-size=\"sm\">Queue Type<\/th>\n<th data-start=\"6393\" data-end=\"6405\" data-col-size=\"sm\">Use Case<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"6432\" data-end=\"6534\">\n<tr data-start=\"6432\" data-end=\"6488\">\n<td data-start=\"6432\" data-end=\"6447\" data-col-size=\"sm\"><strong data-start=\"6434\" data-end=\"6446\">Standard<\/strong><\/td>\n<td data-start=\"6447\" data-end=\"6488\" data-col-size=\"sm\">High throughput, best effort ordering<\/td>\n<\/tr>\n<tr data-start=\"6489\" data-end=\"6534\">\n<td data-start=\"6489\" data-end=\"6500\" data-col-size=\"sm\"><strong data-start=\"6491\" data-end=\"6499\">FIFO<\/strong><\/td>\n<td data-start=\"6500\" data-end=\"6534\" data-col-size=\"sm\">Exact ordering &amp; no duplicates<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p data-start=\"6536\" data-end=\"6597\">If ordering matters (e.g., financial transactions), use FIFO.<\/p>\n<hr data-start=\"6599\" data-end=\"6602\" \/>\n<h1 data-start=\"6604\" data-end=\"6642\">Best Practices for Java Applications<\/h1>\n<h3 data-start=\"6644\" data-end=\"6671\"><strong data-start=\"6648\" data-end=\"6671\">1. Use Long Polling<\/strong><\/h3>\n<p data-start=\"6672\" data-end=\"6716\">Reduces cost and helps avoid empty receives.<\/p>\n<h3 data-start=\"6718\" data-end=\"6762\"><strong data-start=\"6722\" data-end=\"6762\">2. Externalize Queue URLs via Config<\/strong><\/h3>\n<p data-start=\"6763\" data-end=\"6825\">Use Spring Boot application properties or AWS Parameter Store.<\/p>\n<h3 data-start=\"6827\" data-end=\"6859\"><strong data-start=\"6831\" data-end=\"6859\">3. Implement Idempotency<\/strong><\/h3>\n<p data-start=\"6860\" data-end=\"6883\">Support retries safely.<\/p>\n<h3 data-start=\"6885\" data-end=\"6929\"><strong data-start=\"6889\" data-end=\"6929\">4. Set Reasonable Visibility Timeout<\/strong><\/h3>\n<p data-start=\"6930\" data-end=\"6957\">Avoid duplicate processing.<\/p>\n<h3 data-start=\"6959\" data-end=\"6999\"><strong data-start=\"6963\" data-end=\"6999\">5. Use CloudWatch for Monitoring<\/strong><\/h3>\n<p data-start=\"7000\" data-end=\"7006\">Track:<\/p>\n<ul data-start=\"7007\" data-end=\"7063\">\n<li data-start=\"7007\" data-end=\"7026\">\n<p data-start=\"7009\" data-end=\"7026\">Age of messages<\/p>\n<\/li>\n<li data-start=\"7027\" data-end=\"7049\">\n<p data-start=\"7029\" data-end=\"7049\">Number of messages<\/p>\n<\/li>\n<li data-start=\"7050\" data-end=\"7063\">\n<p data-start=\"7052\" data-end=\"7063\">DLQ depth<\/p>\n<\/li>\n<\/ul>\n<hr data-start=\"7065\" data-end=\"7068\" \/>\n<h1 data-start=\"7070\" data-end=\"7082\">Conclusion<\/h1>\n<p data-start=\"7084\" data-end=\"7416\">Integrating AWS SQS and SNS into Java applications is a foundation of reliable, scalable cloud architecture. With a proper messaging flow\u2014publishers using SNS, consumers processing SQS messages, dead-letter queues for failures, and <a href=\"https:\/\/harshad-sonawane.com\/blog\/monitoring-java-applications-prometheus-grafana-kubernetes\/\">monitoring<\/a> via CloudWatch\u2014you gain a platform capable of handling distributed workloads efficiently.<\/p>\n<p data-start=\"7418\" data-end=\"7524\">This combination is battle-tested, cost-effective, and ideal for microservice ecosystems running at scale.<\/p>\n<hr data-start=\"7526\" data-end=\"7529\" \/>\n<h1 data-start=\"7531\" data-end=\"7545\">References<\/h1>\n<p data-start=\"7546\" data-end=\"7590\">(Official AWS resources for deeper learning)<\/p>\n<ul data-start=\"7592\" data-end=\"7907\">\n<li data-start=\"7592\" data-end=\"7650\">\n<p data-start=\"7594\" data-end=\"7650\"><a data-start=\"7594\" data-end=\"7648\" rel=\"noopener\" target=\"_new\" class=\"decorated-link\" href=\"https:\/\/docs.aws.amazon.com\/sns\/latest\/dg\/welcome.html\">https:\/\/docs.aws.amazon.com\/sns\/latest\/dg\/welcome.html<span aria-hidden=\"true\" class=\"ms-0.5 inline-block align-middle leading-none\"><svg width=\"20\" height=\"20\" viewbox=\"0 0 20 20\" fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" data-rtl-flip=\"\" class=\"block h-[0.75em] w-[0.75em] stroke-current stroke-[0.75]\"><path d=\"M14.3349 13.3301V6.60645L5.47065 15.4707C5.21095 15.7304 4.78895 15.7304 4.52925 15.4707C4.26955 15.211 4.26955 14.789 4.52925 14.5293L13.3935 5.66504H6.66011C6.29284 5.66504 5.99507 5.36727 5.99507 5C5.99507 4.63273 6.29284 4.33496 6.66011 4.33496H14.9999L15.1337 4.34863C15.4369 4.41057 15.665 4.67857 15.665 5V13.3301C15.6649 13.6973 15.3672 13.9951 14.9999 13.9951C14.6327 13.9951 14.335 13.6973 14.3349 13.3301Z\"><\/path><\/svg><\/span><\/a><\/p>\n<\/li>\n<li data-start=\"7651\" data-end=\"7742\">\n<p data-start=\"7653\" data-end=\"7742\"><a data-start=\"7653\" data-end=\"7740\" rel=\"noopener\" target=\"_new\" class=\"decorated-link\" href=\"https:\/\/docs.aws.amazon.com\/AWSSimpleQueueService\/latest\/SQSDeveloperGuide\/welcome.html\">https:\/\/docs.aws.amazon.com\/AWSSimpleQueueService\/latest\/SQSDeveloperGuide\/welcome.html<span aria-hidden=\"true\" class=\"ms-0.5 inline-block align-middle leading-none\"><svg width=\"20\" height=\"20\" viewbox=\"0 0 20 20\" fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" data-rtl-flip=\"\" class=\"block h-[0.75em] w-[0.75em] stroke-current stroke-[0.75]\"><path d=\"M14.3349 13.3301V6.60645L5.47065 15.4707C5.21095 15.7304 4.78895 15.7304 4.52925 15.4707C4.26955 15.211 4.26955 14.789 4.52925 14.5293L13.3935 5.66504H6.66011C6.29284 5.66504 5.99507 5.36727 5.99507 5C5.99507 4.63273 6.29284 4.33496 6.66011 4.33496H14.9999L15.1337 4.34863C15.4369 4.41057 15.665 4.67857 15.665 5V13.3301C15.6649 13.6973 15.3672 13.9951 14.9999 13.9951C14.6327 13.9951 14.335 13.6973 14.3349 13.3301Z\"><\/path><\/svg><\/span><\/a><\/p>\n<\/li>\n<li data-start=\"7743\" data-end=\"7820\">\n<p data-start=\"7745\" data-end=\"7820\"><a data-start=\"7745\" data-end=\"7818\" rel=\"noopener\" target=\"_new\" class=\"decorated-link\" href=\"https:\/\/docs.aws.amazon.com\/sdk-for-java\/latest\/developer-guide\/home.html\">https:\/\/docs.aws.amazon.com\/sdk-for-java\/latest\/developer-guide\/home.html<span aria-hidden=\"true\" class=\"ms-0.5 inline-block align-middle leading-none\"><svg width=\"20\" height=\"20\" viewbox=\"0 0 20 20\" fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" data-rtl-flip=\"\" class=\"block h-[0.75em] w-[0.75em] stroke-current stroke-[0.75]\"><path d=\"M14.3349 13.3301V6.60645L5.47065 15.4707C5.21095 15.7304 4.78895 15.7304 4.52925 15.4707C4.26955 15.211 4.26955 14.789 4.52925 14.5293L13.3935 5.66504H6.66011C6.29284 5.66504 5.99507 5.36727 5.99507 5C5.99507 4.63273 6.29284 4.33496 6.66011 4.33496H14.9999L15.1337 4.34863C15.4369 4.41057 15.665 4.67857 15.665 5V13.3301C15.6649 13.6973 15.3672 13.9951 14.9999 13.9951C14.6327 13.9951 14.335 13.6973 14.3349 13.3301Z\"><\/path><\/svg><\/span><\/a><\/p>\n<\/li>\n<li data-start=\"7821\" data-end=\"7907\">\n<p data-start=\"7823\" data-end=\"7907\"><a data-start=\"7823\" data-end=\"7905\" rel=\"noopener\" target=\"_new\" class=\"decorated-link\" href=\"https:\/\/docs.aws.amazon.com\/AWSSimpleQueueService\/latest\/APIReference\/Welcome.html\">https:\/\/docs.aws.amazon.com\/AWSSimpleQueueService\/latest\/APIReference\/Welcome.html<span aria-hidden=\"true\" class=\"ms-0.5 inline-block align-middle leading-none\"><svg width=\"20\" height=\"20\" viewbox=\"0 0 20 20\" fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" data-rtl-flip=\"\" class=\"block h-[0.75em] w-[0.75em] stroke-current stroke-[0.75]\"><path d=\"M14.3349 13.3301V6.60645L5.47065 15.4707C5.21095 15.7304 4.78895 15.7304 4.52925 15.4707C4.26955 15.211 4.26955 14.789 4.52925 14.5293L13.3935 5.66504H6.66011C6.29284 5.66504 5.99507 5.36727 5.99507 5C5.99507 4.63273 6.29284 4.33496 6.66011 4.33496H14.9999L15.1337 4.34863C15.4369 4.41057 15.665 4.67857 15.665 5V13.3301C15.6649 13.6973 15.3672 13.9951 14.9999 13.9951C14.6327 13.9951 14.335 13.6973 14.3349 13.3301Z\"><\/path><\/svg><\/span><\/a><\/p>\n<\/li>\n<\/ul>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"o-typing-delay-100ms ticss-27f7e3e9\"><o-anim-typing>&lt;> <strong>&#8220;Happy developing, one line at a time!&#8221;<\/strong> &lt;\/><\/o-anim-typing><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Modern distributed systems rely heavily on asynchronous communication to maintain resilience, scalability, and fault isolation. AWS offers two widely adopted managed messaging services\u2014Amazon Simple Queue Service (SQS) and Amazon Simple Notification Service (SNS)\u2014that simplify building event-driven architectures in Java applications. SNS enables pub\/sub messaging with multiple subscribers, while SQS provides [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":326,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"footnotes":"","jetpack_publicize_message":"Just published a detailed guide on Integrating AWS SQS and SNS in Java Applications.\nIt covers architecture patterns, Java code examples, best practices, and how to build reliable event-driven systems on AWS.\n\nIf you're working with microservices or distributed applications, this one is worth reading.\n\nHappy to answer any questions or discuss design patterns!","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[154,113],"tags":[6,263,269,2,268,9,267,3,266],"class_list":["post-322","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cloud-computing-serverless-technology-trends","category-java-spring-boot-aws-microservices","tag-aws","tag-cloud-architecture","tag-event-driven-systems","tag-java","tag-messaging","tag-microservices","tag-sns","tag-spring-boot","tag-sqs"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Integrating AWS SQS and SNS in Java Applications for Reliable Messaging - &lt;&gt;HARSHAD&#039;s Dev Diary&lt;\/&gt;<\/title>\n<meta name=\"description\" content=\"A complete guide to integrating AWS SQS and SNS in Java applications. 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