{"id":35153,"date":"2024-09-23T09:07:10","date_gmt":"2024-09-23T13:07:10","guid":{"rendered":"https:\/\/www.eginnovations.com\/blog\/?p=35153"},"modified":"2025-04-17T10:05:26","modified_gmt":"2025-04-17T14:05:26","slug":"exception-monitoring-in-java-a-guide-to-handling-java-exceptions","status":"publish","type":"post","link":"https:\/\/www.eginnovations.com\/blog\/exception-monitoring-in-java-a-guide-to-handling-java-exceptions\/","title":{"rendered":"Exception Monitoring in Java &#8211; A Guide to Handling Java Exceptions"},"content":{"rendered":"<div class=\"inner_content\">\n<h2><span class=\"ez-toc-section\" id=\"Why_is_Exception_Monitoring_in_Java_Important\"><\/span>Why is Exception Monitoring in Java Important?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Exception monitoring in Java plays a vital role in <a class=\"link\" href=\"https:\/\/www.eginnovations.com\/supported-technologies\/java-application-monitoring\">Java application performance monitoring<\/a> by providing real-time insights into the health and stability of the application. Java is now the backbone of many critical and complex business applications in sectors such as banking, healthcare, finance, retail, and e-commerce. The complexity of these systems is also compounded by the fact that they involve distributed Java microservices that communicate across various layers. When an exception occurs in one service, it can cascade to other upstream services. This can potentially cause widespread disruptions affecting business and user experience.<\/p>\n<p>Minor issues can rapidly escalate and propagate quickly in the absence of full observability and <a class=\"link\" href=\"https:\/\/www.eginnovations.com\/blog\/what-is-proactive-monitoring\/\">proactive monitoring.<\/a> Exception monitoring in Java plays a vital role in <a class=\"link\" href=\"https:\/\/www.eginnovations.com\/supported-technologies\/java-application-monitoring\">Java application performance monitoring<\/a> by providing real-time insights into the health and stability of the application.<\/p>\n<p>However, even with monitoring in place, many SRE teams struggle with visibility gaps that leave critical exceptions undetected. In fact, most monitoring tools fail to catch key blind spots, leading to cascading failures and prolonged troubleshooting.<\/p>\n<table class=\"hand_table_style\" style=\"width: 100%;\">\n<tbody>\n<tr>\n<td><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2020\/09\/hand-symbol.png\" alt=\"hand-icon\" width=\"48\" height=\"28\" border=\"0\"><\/td>\n<td>\n<div><a href=\"https:\/\/www.eginnovations.com\/blog\/7-java-exception-monitoring-blind-spots\/\" target=\"_blank\" rel=\"noopener,noreferrer\">Discover the 7 most common blind spots in Java exception monitoring and how to eliminate them.<\/a><\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><span class=\"ez-toc-section\" id=\"Key_Reasons_Why_Exception_Monitoring_in_Java_is_Essential\"><\/span>Key Reasons Why Exception Monitoring in Java is Essential<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Monitoring exceptions in Java is essential for several key reasons:<\/p>\n<ul>\n<li><strong>Proactive Issue Detection:<\/strong> Exception monitoring enables developers to identify issues before they become major problems. By capturing and analyzing exception data, developers can trace performance bottlenecks to their root causes, allowing for early detection and proactive prevention of errors.<\/li>\n<li><strong>Performance Penalty:<\/strong> Exceptions in Java are expensive and shouldn&#8217;t be used for flow control. When an exception is thrown, it interrupts the JVM&#8217;s optimized execution, leading to performance issues. The JVM has to stop optimizations, handle the exception, and deal with memory cleanup, which slows down the system.<\/li>\n<li><strong>Root Cause Analysis:<\/strong> Java exception monitoring helps identify the root causes of errors, whether from code defects, configuration issues, or environmental factors.<\/li>\n<li><strong>User Experience:<\/strong> Frequent and unresolved exceptions can lead to poor application performance, affecting user satisfaction. Monitoring ensures that exceptions are quickly identified and addressed to maintain smooth performance and improve the user experience.<\/li>\n<li><strong>Trend Analysis:<\/strong> By tracking exceptions over time, you can identify recurring issues or bottlenecks in your applications and take corrective actions.<\/li>\n<\/ul>\n<div style=\"padding: 20px; border: 1px solid #ffd392; background: #fcf8ef; text-align: justify; margin-bottom: 30px;\">\n<h2><span class=\"ez-toc-section\" id=\"What_is_a_Java_Exception\"><\/span>What is a Java Exception?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"margin-bottom: 5px;\">In Java, an exception is an event that disrupts the normal flow of a program&#8217;s execution. This event occurs when the JVM (Java Virtual Machine) detects an error or an unexpected condition, such as invalid data or system issues. Java exceptions are handled through a structured error-handling mechanism.<\/p>\n<\/div>\n<div class=\"frm-cta\"><a class=\"frm-cta-link\" href=\"https:\/\/www.eginnovations.com\/blog\/7-java-exception-monitoring-blind-spots\/\" target=\"_self\" rel=\"noopener noreferrer\">7 Java Exception Monitoring Blind Spots That SREs Must Eliminate \u00bb<\/a><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Common_Causes_of_Java_Exceptions\"><\/span>Common Causes of Java Exceptions:<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"margin-bottom: 15px;\">Common reasons that exceptions are thrown within Java code, include:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-35234 size-full\" style=\"width: 90%;\" src=\"https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/Causes-java-Exceptions.png\" alt=\"A graphic showing common reasons that exceptions are thrown within Java code, include: Network Drops: Connectivity issues can cause I\/O operations to fail. Invalid Input: User or system-provided data that doesn\u2019t meet expected formats. Non-existent Files: File operations that attempt to access files that are missing. Code-level Bugs: Logical or syntactical errors in the code that break execution. Resource Exhaustion: Applications can run into exceptions when system resources are depleted. Database Issues: Typically, connection issues or query errors. Environmental Factors: Exceptions can be caused by external factors that are outside the application's control. \" width=\"2999\" height=\"1843\" srcset=\"https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/Causes-java-Exceptions.png 2999w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/Causes-java-Exceptions-300x184.png 300w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/Causes-java-Exceptions-1024x629.png 1024w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/Causes-java-Exceptions-768x472.png 768w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/Causes-java-Exceptions-1536x944.png 1536w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/Causes-java-Exceptions-2048x1259.png 2048w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/Causes-java-Exceptions-800x492.png 800w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/Causes-java-Exceptions-310x191.png 310w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/Causes-java-Exceptions-140x86.png 140w\" sizes=\"auto, (max-width: 2999px) 100vw, 2999px\" \/><\/p>\n<p>Understanding the common causes of exceptions is crucial for effectively handling exceptions in Java applications. Here are some common issues that can lead to exceptions.<\/p>\n<p style=\"font-family: Graphik-Semibold;font-size: 26px;line-height: 40px;margin-bottom: 15px;\">1. Network Drops<\/p>\n<p style=\"margin-bottom: 15px;\">Connectivity issues can disrupt I\/O operations, leading to exceptions when the application attempts to read from or write to a network resource. This can occur due to:<\/p>\n<ul>\n<li><strong>Unstable Internet Connections:<\/strong> Fluctuations in network connectivity can cause timeouts or interruptions in data transmission.<\/li>\n<li><strong>Server Downtime:<\/strong> If the server is temporarily unavailable, attempts to connect can throw exceptions like <span style=\"color: #008000;\">SocketException.<\/span><\/li>\n<li><strong>Firewall Restrictions:<\/strong> Firewalls may block certain ports or protocols, preventing access to required resources.<\/li>\n<\/ul>\n<p style=\"font-family: Graphik-Semibold;font-size: 26px;line-height: 40px;margin-bottom: 15px;\">2. Invalid Input<\/p>\n<p style=\"margin-bottom: 15px;\">Exceptions can arise from user or system-provided data that doesn\u2019t meet expected formats or validation criteria. Common scenarios include:<\/p>\n<ul>\n<li><strong>Type Mismatches:<\/strong> Entering a string where a number is expected can trigger a <span style=\"color: #008000;\">NumberFormatException.<\/span><\/li>\n<li><strong>Out-of-Range Values:<\/strong> Providing values outside the acceptable range, such as negative numbers for age, can lead to <span style=\"color: #008000;\">IllegalArgumentException.<\/span><\/li>\n<li><strong>Malformed Data:<\/strong> Input that does not conform to expected patterns, such as an improperly formatted email address, can cause validation exceptions.<\/li>\n<\/ul>\n<p style=\"font-family: Graphik-Semibold;font-size: 26px;line-height: 40px;margin-bottom: 15px;\">3. Non-existent Files<\/p>\n<p style=\"margin-bottom: 15px;\">File operations that attempt to access files that are missing or have been moved can result in exceptions such as:<\/p>\n<ul>\n<li><strong>FileNotFoundException:<\/strong> This occurs when the application tries to read a file that does not exist at the specified path.<\/li>\n<li><strong>IOException:<\/strong> General input\/output errors can occur if there are issues reading from or writing to a file, such as lack of permissions or disk space.<\/li>\n<\/ul>\n<p style=\"font-family: Graphik-Semibold;font-size: 26px;line-height: 40px;margin-bottom: 15px;\">4. Code-level Bugs<\/p>\n<p style=\"margin-bottom: 15px;\">Logical or syntactical errors in the code can lead to exceptions during execution. These bugs can manifest in various ways:<\/p>\n<ul>\n<li><strong>Null Pointer Exceptions:<\/strong> Attempting to access methods or properties on a null object can throw a <span style=\"color: #008000;\">NullPointerException.<\/span><\/li>\n<li><strong>Index Out of Bounds:<\/strong> Accessing an array or list with an invalid index can result in an <span style=\"color: #008000;\">ArrayIndexOutOfBoundsException.<\/span><\/li>\n<li><strong>Infinite Loops:<\/strong> Logical errors that create infinite loops can eventually lead to a <span style=\"color: #008000;\">StackOverflowError<\/span> due to excessive recursion.<\/li>\n<\/ul>\n<p><a href=\"https:\/\/www.eginnovations.com\/ebooks\/application-performance-management-vendor-comparison\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-35223\" src=\"https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/banner-1.jpg\" alt=\"\" width=\"850\" height=\"180\" srcset=\"https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/banner-1.jpg 850w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/banner-1-300x64.jpg 300w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/banner-1-768x163.jpg 768w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/banner-1-800x169.jpg 800w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/banner-1-310x66.jpg 310w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/banner-1-140x30.jpg 140w\" sizes=\"auto, (max-width: 850px) 100vw, 850px\" \/><\/a><\/p>\n<p style=\"font-family: Graphik-Semibold;font-size: 26px;line-height: 40px;margin-bottom: 15px;\">5. Resource Exhaustion<\/p>\n<p style=\"margin-bottom: 15px;\">Applications can run into exceptions when system resources are depleted, such as:<\/p>\n<ul>\n<li><strong>OutOfMemoryError:<\/strong> This occurs when the Java Virtual Machine (JVM) cannot allocate an object because it has run out of memory. We\u2019ve got some more information on troubleshooting \u201cthe dreaded OutOfMemoryError\u201d available, here: <a class=\"link\" href=\"https:\/\/www.eginnovations.com\/blog\/java-application-monitoring-how-it-ops-can-diagnose-memory-leaks-at-scale\/\">Java Application Monitoring &#8211; How IT Ops can Diagnose Memory Leaks at Scale.<\/a><\/li>\n<li><strong>File Descriptor Limits<\/strong>: Exceeding the maximum number of open file descriptors can lead to <span style=\"color: #008000;\">IOException<\/span> when trying to open new files.<\/li>\n<\/ul>\n<p style=\"font-family: Graphik-Semibold;font-size: 26px;line-height: 40px;margin-bottom: 15px;\">6. Database Issues<\/p>\n<p style=\"margin-bottom: 15px;\">Interacting with databases can introduce exceptions due to:<\/p>\n<ul>\n<li><strong>Connection Failures:<\/strong> Issues connecting to the database, such as incorrect credentials or unreachable servers, can throw <span style=\"color: #008000;\">SQLException.<\/span><\/li>\n<li><strong>Query Errors:<\/strong> Syntax errors in SQL queries or violations of database constraints (like unique constraints) can also result in exceptions.<\/li>\n<\/ul>\n<p>In large Java applications, even small errors can spread through the system, causing slow performance and bad user experiences. Without good monitoring, these problems can go unnoticed until they cause major disruptions. Exception monitoring with transaction tracing helps teams catch and fix errors early, stopping issues before they affect the application&#8217;s stability and users.<\/p>\n<p><a href=\"https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/figure-1-zoom.jpg\" data-rel=\"lightbox-image-0\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/figure1.webp\" alt=\"\" width=\"750\" height=\"377\" class=\"aligncenter size-full wp-image-35368\" srcset=\"https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/figure1.webp 750w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/figure1-300x151.webp 300w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/figure1-310x156.webp 310w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/figure1-140x70.webp 140w\" sizes=\"auto, (max-width: 750px) 100vw, 750px\" \/><\/a><\/p>\n<div class=\"img_caption\">Figure 1: Visualization of Java Application Transaction Execution Using Transaction Tracing<br \/>\nNote how the observability tool clearly pinpoints the source of an error, which has a cascading effect on a particular user. SREs and AppOps can quickly diagnose and resolve the root cause before it impacts other users.\n<\/div>\n<p>Simply identifying the occurrence of an exception isn\u2019t enough\u2014knowing the precise line of code where the issue originated allows teams to quickly address the root cause. This level of granularity is key to maintaining performance, minimizing downtime, and enhancing the user experience.<\/p>\n<p><a href=\"https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/figure-2-zoom.jpg\" data-rel=\"lightbox-image-1\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/figure-2.webp\" alt=\"\" width=\"750\" height=\"287\" class=\"aligncenter size-full wp-image-35371\" srcset=\"https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/figure-2.webp 750w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/figure-2-300x115.webp 300w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/figure-2-310x119.webp 310w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/figure-2-140x54.webp 140w\" sizes=\"auto, (max-width: 750px) 100vw, 750px\" \/><\/a><\/p>\n<div class=\"img_caption\">Figure 2: Code-Level Precision in Exception Monitoring in Java<\/div>\n<p>SREs and IT Ops need an observability tool that identifies the exact line of code where an exception occurred. This provides them with the detailed insights needed for quick and effective issue resolution.<\/p>\n<p style=\"font-family: Graphik-Semibold;font-size: 26px;line-height: 40px;margin-bottom: 15px;\">7. Environmental Factors<\/p>\n<p style=\"margin-bottom: 15px;\">Sometimes, exceptions are caused by external factors that are outside the application&#8217;s control:<\/p>\n<ul>\n<li><strong>Configuration Issues:<\/strong> Incorrect or missing configuration files can lead to <span style=\"color: #008000;\">ConfigurationException<\/span> or similar errors.<\/li>\n<li><strong>Dependency Failures:<\/strong> If an external service or library that your application depends on fails or changes unexpectedly, it can lead to runtime exceptions.<\/li>\n<\/ul>\n<p><a href=\"https:\/\/www.eginnovations.com\/white-paper\/how-to-get-full-stack-visibility-for-your-java-applications\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-35227\" src=\"https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/full-stack-visibility-whitepaper.jpg\" alt=\"\" width=\"850\" height=\"180\" \/><\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Java_Exceptions_vs_Errors_-_What_is_the_Difference\"><\/span>Java Exceptions vs Errors \u2013 What is the Difference?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"margin-bottom: 15px;\">In Java, both exceptions and errors are abnormal conditions that disrupt the normal flow of a program. However, they differ in their causes, how they\u2019re handled, and their impact on the application:<\/p>\n<ul>\n<li><strong>Exceptions:<\/strong> These are conditions that a program can handle, such as file not found, invalid input, or database connection issues. They are typically recoverable by applying appropriate handling strategies.<\/li>\n<li><strong>Errors:<\/strong> Errors represent more serious problems, usually outside the program&#8217;s control, such as <span style=\"color: #008000;\">OutOfMemoryError.<\/span> These are generally unrecoverable and signify critical issues in the <a class=\"link\" href=\"https:\/\/www.eginnovations.com\/supported-technologies\/jvm-monitoring\">JVM (Java Virtual Machine)<\/a> environment.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Examples_of_JVM_Errors\"><\/span>Examples of JVM Errors:<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"margin-bottom: 15px;\">Two very common JVM exceptions, that you will invariably encounter at some point, are:<\/p>\n<ul>\n<li><strong>OutOfMemoryError:<\/strong> Thrown when the Java Virtual Machine can no longer allocate an object because it has run out of memory.<\/li>\n<li><strong>StackOverflowError:<\/strong> Occurs when a method recurses too deeply.<\/li>\n<\/ul>\n<p>The main difference is that exceptions can be anticipated and potentially fixed by the application, while errors usually can&#8217;t be recovered from and signal deeper issues with the system or JVM.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"The_Hierarchy_of_Java_Exceptions\"><\/span>The Hierarchy of Java Exceptions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-35235 size-full\" style=\"width: 410px;\" src=\"https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/exception-handling.png\" alt=\"Graphic showing Exception handling as an umbrella for checked exceptions, unchecked exceptions and errors\" width=\"420\" height=\"340\" srcset=\"https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/exception-handling.png 420w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/exception-handling-300x243.png 300w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/exception-handling-310x251.png 310w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/exception-handling-140x113.png 140w\" sizes=\"auto, (max-width: 420px) 100vw, 420px\" \/><\/p>\n<p style=\"margin-bottom: 15px;\">Java exceptions are structured in a hierarchy, starting from the Throwable class:<\/p>\n<ul>\n<li><strong>Throwable<\/strong>\n<ul>\n<li><strong>Error<\/strong> (Unrecoverable issues, e.g., JVM crashes)<\/li>\n<li><strong>Exception<\/strong>\n<ul>\n<li><strong>Checked Exceptions:<\/strong> Must be caught or declared (e.g., <span style=\"color: #008000;\">IOException<\/span>).<\/li>\n<li><strong>Unchecked Exceptions:<\/strong> Also known as Runtime Exceptions, they don\u2019t need to be declared or caught (e.g., <span style=\"color: #008000;\">NullPointerException, ArrayIndexOutOfBoundsException<\/span>)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><a href=\"https:\/\/www.eginnovations.com\/white-paper\/top-10-requirements-for-performance-monitoring-of-cloud-applications-and-infrastructures\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-35228\" src=\"https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/Top10-Requirements-for-Performance-Monitoring.jpg\" alt=\"\" width=\"850\" height=\"180\" srcset=\"https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/Top10-Requirements-for-Performance-Monitoring.jpg 850w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/Top10-Requirements-for-Performance-Monitoring-300x64.jpg 300w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/Top10-Requirements-for-Performance-Monitoring-768x163.jpg 768w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/Top10-Requirements-for-Performance-Monitoring-800x169.jpg 800w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/Top10-Requirements-for-Performance-Monitoring-310x66.jpg 310w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/Top10-Requirements-for-Performance-Monitoring-140x30.jpg 140w\" sizes=\"auto, (max-width: 850px) 100vw, 850px\" \/><\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Unchecked_Exceptions_in_Java\"><\/span>Unchecked Exceptions in Java<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"margin-bottom: 15px;\"><a class=\"link\" href=\"https:\/\/www.theserverside.com\/answer\/What-are-checked-vs-unchecked-exceptions-in-Java#:~:text=Unchecked%20exceptions%20result%20from%20faulty,object%2C%20an%20unchecked%20NullPointerException%20occurs.\" target=\"blank\" rel=\"noopener\">Unchecked exceptions<\/a> in Java typically indicate programming errors or flaws in the logic of the application. They occur due to conditions like:<\/p>\n<p style=\"font-family: Graphik-Semibold;font-size: 26px;line-height: 40px;margin-bottom: 15px;\">1. NullPointerException<\/p>\n<ul>\n<li><strong>Description:<\/strong> This exception is thrown when an application attempts to call methods on a null object reference.<\/li>\n<li><strong>Example:<\/strong> <em>NullPointerException<\/em> can occur when trying to call a method on an object that has not been initialized or has been set to null.<\/li>\n<\/ul>\n<p style=\"font-family: Graphik-Semibold;font-size: 26px;line-height: 40px;margin-bottom: 15px;\">2. ArrayIndexOutOfBoundsException<\/p>\n<ul>\n<li><strong>Description:<\/strong> This exception is thrown when an application attempts to access an array with an index that is out of range.<\/li>\n<li><strong>Example:<\/strong> <em>ArrayIndexOutOfBoundsException<\/em> can occur when trying to access an array element with an index that is less than 0 or greater than or equal to the length of the array.<\/li>\n<\/ul>\n<p style=\"font-family: Graphik-Semibold;font-size: 26px;line-height: 40px;margin-bottom: 15px;\">3. IllegalArgumentException<\/p>\n<ul>\n<li><strong>Description:<\/strong> This exception is thrown when an application passes an argument to a method that does not meet the expected criteria.<\/li>\n<li><strong>Example:<\/strong> <em>IllegalArgumentException<\/em> can occur when passing invalid or inappropriate arguments to a method, such as passing a negative number where a positive number is expected.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Characteristics_of_Unchecked_Java_Exceptions\"><\/span>Characteristics of Unchecked Java Exceptions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"margin-bottom: 15px;\">Key features of unchecked Java exceptions, include:<\/p>\n<ul>\n<li><strong>No Forced Handling:<\/strong> Unlike checked exceptions, unchecked exceptions do not require explicit handling by the developer. The JVM does not enforce the declaration of these exceptions in method signatures.<\/li>\n<li><strong>Deep-Rooted Problems:<\/strong> These kinds of exceptions often signal deep-rooted problems in the code. They can be harder to catch because they arise from fundamental flaws in the application&#8217;s logic.<\/li>\n<li><strong>Runtime Errors:<\/strong> Unchecked exceptions are runtime errors, meaning they occur during the execution of the program, rather than at the time of compilation.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Exception_Handling_in_Java\"><\/span>Exception Handling in Java<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"margin-bottom: 15px;\">Exception handling in Java revolves around four key components:<\/p>\n<ul>\n<li><strong>Try:<\/strong> Defines the block of code that is watched for exceptions.It means we can&#8217;t use try block alone. The try block must be followed by either catch or finally.<\/li>\n<li><strong>Catch:<\/strong> Handles the exception if one occurs in the try block It must be preceded by a try block which means we can&#8217;t use catch block alone. It can be followed by finally block later.<\/li>\n<li><strong>Finally:<\/strong> Optional block that executes after try\/catch regardless of the outcome. Putting cleanup code in a finally block is always good practice, even when no exceptions are anticipated.<\/li>\n<li><strong>Throw\/Throws:<\/strong> Used to explicitly throw an exception or declare an exception in a method signature.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"What_are_Exception_Handlers_in_Java\"><\/span>What are Exception Handlers in Java?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-35272 size-full\" style=\"width: 157px;\" src=\"https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/handlers-img.png\" alt=\"Graphic is just decorative representation of an error being thrown - Exception monitoring in Java\" width=\"217\" height=\"720\" srcset=\"https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/handlers-img.png 217w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/handlers-img-90x300.png 90w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/handlers-img-140x465.png 140w\" sizes=\"auto, (max-width: 217px) 100vw, 217px\" \/>Exception handlers are blocks of code that manage and mitigate the effects of an exception. When an exception occurs, the handler either attempts to resolve the issue and \/ or logs it for further analysis.<\/p>\n<p>The JVM provides various runtime services to Java programs. This includes exception handling, which allows programmers to catch and handle exceptions that occur during program execution.<\/p>\n<p style=\"margin-bottom: 15px;\">Why Exception Handling is Important in Java:<\/p>\n<ul>\n<li style=\"text-align: left;\"><strong>Robustness:<\/strong> Ensures that the application can handle unexpected scenarios without failing completely.<\/li>\n<li style=\"text-align: left;\"><strong>Error Tracking:<\/strong> Helps developers identify and fix bugs more easily.<\/li>\n<li style=\"text-align: left;\"><strong>Recovery:<\/strong> Allows programs to recover from certain errors without interrupting user experiences.<\/li>\n<li style=\"text-align: left;\"><strong>Logging:<\/strong> Captures information about exceptions for troubleshooting and monitoring purposes.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Final_Thoughts_on_Exception_Handling_and_the_Value_of_Exception_Monitoring_in_Java\"><\/span>Final Thoughts on Exception Handling and the Value of Exception Monitoring in Java<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Exception handling is more than just catching errors in Java code\u2014it\u2019s about designing resilient Java applications that can gracefully handle failures and recover from issues. With proper exception handling mechanisms and by putting in place exception monitoring in Java to identify and pinpoint the root-cause issues, you can build robust applications that minimize downtime, enhance user experiences and use resources optimally.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Next_Blog_7_Java_Exception_Monitoring_Blind_Spots_That_SREs_Must_Eliminate\"><\/span>Next Blog: 7 Java Exception Monitoring Blind Spots That SREs Must Eliminate<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Now that we\u2019ve covered the fundamentals of Java exception monitoring, it&#8217;s time to address the gaps that often go unnoticed.<\/p>\n<p>Many SRE teams struggle with visibility when identifying, prioritizing, and resolving exceptions that truly impact system stability. Without addressing these critical insights, monitoring remains incomplete.<\/p>\n<p>These blind spots can lead to undetected failures\u2014resulting in outages, lost revenue, and hours wasted on debugging.<\/p>\n<p>I&#8217;ll walk you through seven key challenges in the next installment of this blog series: <a class=\"link\" href=\"https:\/\/www.eginnovations.com\/blog\/7-java-exception-monitoring-blind-spots\/\">https:\/\/www.eginnovations.com\/blog\/7-java-exception-monitoring-blind-spots\/<\/a><\/p>\n<p><a href=\"https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/image-2-zoom.jpg\" data-rel=\"lightbox-image-2\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-35209 size-full\" src=\"https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/image-2-1.webp\" alt=\"Exception monitoring in Java - Dashboard continuously monitoring Java Exceptions\" width=\"750\" height=\"654\" srcset=\"https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/image-2-1.webp 750w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/image-2-1-300x262.webp 300w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/image-2-1-310x270.webp 310w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/image-2-1-140x122.webp 140w\" sizes=\"auto, (max-width: 750px) 100vw, 750px\" \/><\/a><\/p>\n<div class=\"img_caption\">Figure 3: In our next article, we\u2019ll cover the built-in reports from eG Enterprise that track Java exceptions. You\u2019ll probably recognize some of the exceptions described in this article.<\/div>\n<p><a href=\"https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/image-3-zoom.jpg\" data-rel=\"lightbox-image-3\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-35207 size-full\" src=\"https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/image-3-1.webp\" alt=\"Long term trend analysis of Java Exceptions and history provided by Exception monitoring in Java\" width=\"750\" height=\"542\" srcset=\"https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/image-3-1.webp 750w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/image-3-1-300x217.webp 300w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/image-3-1-310x224.webp 310w, https:\/\/www.eginnovations.com\/blog\/wp-content\/uploads\/2024\/09\/image-3-1-140x101.webp 140w\" sizes=\"auto, (max-width: 750px) 100vw, 750px\" \/><\/a><\/p>\n<div class=\"img_caption\">Figure 4: In our next blog, I will demonstrate how SRE and IT Ops can leverage simple dashboards and reports, without any coding knowledge, to identify the root cause of Java issues and hold App Dev teams and third-party vendors accountable.<\/div>\n<div class=\"containers mb-4\" style=\"clear:both\">\n \t<div class=\"fixed-free-trial-div mb-3\" id=\"fixedsectioninfo_blog_btn\">\n \t\n \t<style>.containers_hide_row,.all_blogs_bottom{\n \tdisplay:none;\n   \n}\t<\/style>\n                <div class=\"box-style container row pt-4 pb-4  animatedParent animateOnce\" data-sequence=\"100\" style=\"border-bottom: 1px solid #ddd;border-top: 1px solid #ddd;background: #4b4b4b;padding: 15px 15px 0 15px;border-radius: 12px;\">\n                \n                <div class=\"text-center animated fadeIn go\"> \n                <p class=\"text-center mb-4\" style=\"    color: #fff;\">\n\neG Enterprise is an Observability solution for Modern IT. Monitor digital workspaces, <br\/>web applications, SaaS services, cloud and containers from a single pane of glass.\n<\/p>\n                <\/div>\n                    <div class=\"text-center pb-1 animated fadeIn go\" data-id=\"8\">\n                        <a class=\"border-btnhead-eg\"  href=\"https:\/\/www.eginnovations.com\/it-monitoring\/free-trial\"> <span style=\"font-family: GraphikMedium!important;color: #fff;\">Free Trial<\/span><\/a>\n                        <a href=\"https:\/\/www.eginnovations.com\/supported-technologies\/java-performance-monitoring\" class=\" border-btnhead-eg\" style=\"width:230px;   \"> <svg width=\"24\" height=\"24\" style=\"margin-top:-3px\" version=\"1.1\" id=\"Layer_1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" x=\"0px\" y=\"0px\"\n\t viewBox=\"0 0 26.5 26.5\" style=\"enable-background:new 0 0 26.5 26.5;\" xml:space=\"preserve\">\n<style type=\"text\/css\">\n\t.st2{fill:#fff !important;stroke:#fff !important;stroke-miterlimit:10;}\n\t\n\t\t.border-btnhead:hover .st2 {\n  fill: #ffffff !important;\n  stroke: #ffffff;\n}\n<\/style>\n<g>\n\t<g>\n\t\t<path class=\"st2\" d=\"M13.3,25.8c-6.9,0-12.5-5.6-12.5-12.5S6.4,0.8,13.3,0.8s12.5,5.6,12.5,12.5S20.2,25.8,13.3,25.8z M13.3,1.8\n\t\t\tC6.9,1.8,1.8,6.9,1.8,13.3S7,24.8,13.3,24.8s11.5-5.2,11.5-11.5S19.6,1.8,13.3,1.8z M11.2,18.1c-0.2,0-0.4-0.1-0.6-0.2\n\t\t\tc-0.3-0.2-0.6-0.6-0.6-1V9.7c0-0.4,0.2-0.8,0.6-1c0.3-0.2,0.8-0.2,1.2,0l6.2,3.6c0.3,0.2,0.6,0.6,0.6,1s-0.2,0.8-0.6,1l-6.2,3.6\n\t\t\tC11.6,18,11.4,18.1,11.2,18.1z\"\/>\n\t<\/g>\n<\/g>\n<\/svg> <span style=\"font-family: GraphikMedium!important;color: #fff;\">&nbsp;See the platform<\/span><\/a>\n                    <\/div>\n                <\/div>\n                \n                 <\/div>\n            <\/div>\n<h2><span class=\"ez-toc-section\" id=\"Learn_More\"><\/span>Learn More:<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"margin-bottom: 15px;\">If you enjoyed this blog, you might be interested to read some others:<\/p>\n<ul>\n<li><a class=\"link\" href=\"https:\/\/www.eginnovations.com\/blog\/demystifying-java-lambda-expressions\/\">Demystifying Java Lambda Expressions | eG Innovations<\/a><\/li>\n<li><a class=\"link\" href=\"https:\/\/www.eginnovations.com\/blog\/what-is-garbage-collection-java\/\/\">Garbage Collection in Java: Best Practices | eG Innovations<\/a><\/li>\n<li><a class=\"link\" href=\"https:\/\/www.eginnovations.com\/blog\/7-myths-of-java-memory-leaks-what-sres-need-to-know-and-communicate\/\">Java Memory Leak: 7 Myths that SREs Need to Know (eginnovations.com)<\/a><\/li>\n<li><a class=\"link\" href=\"https:\/\/www.eginnovations.com\/blog\/how-apm-solutions-enhance-jmeter-load-testing-visibility-bridging-the-gap\/\">How APM Solutions Enhance JMeter Load Testing Visibility (eginnovations.com)<\/a><\/li>\n<li><a class=\"link\" href=\"https:\/\/www.eginnovations.com\/blog\/top-10-java-performance-problems\/\">Top Java Performance Problems &amp; How to Fix them | eG Innovations<\/a><\/li>\n<\/ul>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Why is Exception Monitoring in Java Important? Exception monitoring in Java plays a vital role in Java application performance monitoring by providing real-time insights into the health and stability of the application. Java is now the backbone of many critical and complex business applications in sectors such as banking, healthcare, finance, retail, and e-commerce. The [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":35262,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"_lmt_disableupdate":"no","_lmt_disable":"","footnotes":""},"categories":[27],"tags":[1352,791,1970,493,602,1381,1365,176,496,555,578],"class_list":["post-35153","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java-monitoring","tag-apm-monitoring-tool","tag-application-transaction-tracing","tag-code-level-analysis","tag-code-level-monitoring","tag-java-code","tag-java-exception","tag-java-exceptions","tag-java-monitoring","tag-java-slowness","tag-java-troubleshooting","tag-jvm-monitoring"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Exception Monitoring in Java - A Guide to Handling Java Exceptions | eG 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