![]() For the sake of this example, we generate the Model objects that contain the Attributes ourselves. In our example, we want to load all Attributes of different Models of some kind. To get an idea of how a real memory leak looks like, we create an example on the basis of the Baeldung memory leak article. To investigate a memory leak around a particular use case in detail, the. So, if we did not wait long enough for the garbage collector to run, we could come to the false conclusion that a memory leak occurred. Any deeper analysis of a memory leak requires the functionality in the heap walker. For the first two problems, you will mainly use the heap walker, mostly by looking at who is holding on to the biggest objects in the JVM and where they were created. The three most common problems that can be solved with memory profiling are: Finding a memory leak, reducing memory consumption and reducing the creation of temporary objects. Only at the end of the startup period we can see a spike in the garbage collector graph and a dramatic decrease in used memory. Allocation recording is controlled in the 'Live memory' section but the recorded data is also displayed by the heap walker. JProfilers heap walker offers you an intuitive interface to solve both simple and complex. But if we look at the GC Activity graph during the startup period the memory increases, we observe that the garbage collector did not run (activity at 0%). Finding a memory leak can be impossible without the right tool. Depending on the options we select, when starting the profiling session, it shows us the memory, garbage collector activity, recorded throughput, CPU load and many more.įor example, this is the memory graph for the startup of a service.įor someone who has never dealt with a memory leak, looking at this graph, he might think that a memory leak occurred as the memory usage is increasing continuously. JProfiler displays several graphs after it has started up. Example 4: Detecting a Memory Leak during an Endurance Test with EJ JProfiler Let's continue our use of JProfiler and the exploration of the memory of our. We will take a look at a memory leak and investigate how it would be possible to detect using the tools that JProfiler offers. There are many blog posts and articles about different kind of memory leaks and how their memory footprint looks like, unfortunately, it is very hard to find the memory leak based only on the memory graph. JProfiler brings many more features, like database profiling but these are out of the scope of this blog post. ![]() It provides many useful tools such as memory profiling, a way to analyze heap snapshots and a live memory view that shows all objects that are currently in use. In Java, static fields usually remain in memory as long as the application is running.JProfiler is a java profiler developed by ej-technologies that helps developers resolve performance bottlenecks, find memory leaks and understand threading issues. Through static FieldsĮxcessive usage of static fields can potentially lead to a memory leak. The most common types are detailed below: 1. Memory leaks can be of various types, depending on how they happen. ![]() Excessive operating system page swapping.Insertion without deletion into Collection objects.These unintentional object references prevent the built-in Java garbage collection mechanism from freeing up the memory consumed by these objects.Ĭommon causes for these memory leaks are: ![]() In general, a Java memory leak happens when an application unintentionally (due to logical errors in code) holds on to object references that are no longer required. If memory leaks are not handled, an application can eventually run out of memory and terminate with an 'OutOfMemoryError', which is irrecoverable. Memory leaks block access to resources and cause an application to consume more memory over time, leading to degrading system performance. As a result, these unused objects are unnecessarily maintained in memory. To analyze the dump with JXRay, download the jxray.zip file from unzip it, and run. Unused objects are typically removed by the Java Garbage Collector (GC) but in cases where objects are still being referenced, they are not eligible to be removed. A memory leak is a situation where unused objects occupy unnecessary space in memory. ![]()
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