How to Fix the _java.lang.OutOfMemoryError_ Java heap space_ Error_

1. How to Fix the "java.lang.OutOfMemoryError: Java heap space" Error? All Java applications run inside a Java virtual machine (JVM). Each JVM is allocated a certain amount of memory when it starts, and that’s the only memory Java applications are allowed to use. When a Java application exceeds the allocated amount of memory, several errors may occur, including the "java.lang.OutOfMemoryError: Java heap space" error. Let’s take a closer look at what this fairly common error message means and some of the ways how it can be solved. What Does the "java.lang.OutOfMemoryError: Java heap space" Error Mean? The "java.lang.OutOfMemoryError: Java heap space" error means that the JVM ran out of memory. Java memory is divided into several regions, with Heap Space serving as the memory container that is shared among all Java virtual machine threads and being the runtime data area from which memory for all class instances and arrays is allocated. When an application attempts to add more data into Heap Space but there is not enough room for it, the "java.lang.OutOfMemoryError: Java heap space" error occurs. The size of Heap Space is set during the JVM launch and can be customized using several parameters: Xms - the minimum size of the Heap Xmx - the maximum size of the Heap -XX:MaxPermSize - the maximum size of PermGen (not used in Java 8 and above) Fixing the "java.lang.OutOfMemoryError: Java heap space" Error Knowing what causes the "java.lang.OutOfMemoryError: Java heap space" error, two options how to fix it emerge: Option 1: Allow the JVM to Use More Memory Some applications are more memory-intensive than others, and the default size of the Heap may not be sufficient. In those cases, the simplest solution is to allow the JVM to use more memory using the three most common parameters for changing the memory allocation. Open Eclipse, click Run → Run Configurations → Select your Java application → update the VM arguments with the following options: -Xms750m -Xmx2048m - XX:MaxPermSize=1024m You may, however, discover that increasing the amount of available memory doesn’t solve the "java.lang.OutOfMemoryError: Java heap space" error because the application instantly consumes all memory it has at its disposal. In that case, it’s necessary to fix the application so that it uses less memory.

2. Option 2: Make Changes to the Application If there is one programming error that is often behind the "java.lang.OutOfMemoryError: Java heap space" error, it’s memory leak. When an application contains a memory leak, it leaves behind objects whenever the leaking functionality is used, gradually consuming all available memory. To find a memory leak, you should figure out which objects occupy the largest portions of Heap Space and find out where the problematic objects are being allocated in the source code. You may want to enable Garbage Collection logging using the -Xloggc:/var/log/YOUR_APP/YOUR_APP-gc.log parameter to see how the Heap is growing and behaving. The java.lang.OutOfMemoryError: Java heap space" error may also be caused by sudden spikes in memory usage, which often happen when applications encounter an excessive number of users. Conclusion The cause of the "java.lang.OutOfMemoryError: Java heap space" error is simple: not enough memory. In some cases, increasing the amount of memory allocated to the JVM is enough, but many other cases can only be solved by fixing the underlying issue that causes the application to run out of memory. For other technical guides and resources check out the AGR Technology blog you require any software development for your business. and this page if