how to resolve outofmemoryerror in java
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Resolving OutOfMemoryError in Java: A Comprehensive Guide
The `OutOfMemoryError` (OOM) in Java is a dreaded exception that signifies your Java Virtual Machine (JVM) has run out of memory and cannot allocate any more objects. It's a common and frustrating problem, but understanding its causes and knowing how to diagnose and fix it is crucial for any Java developer.
This comprehensive guide will explore the different types of `OutOfMemoryError`, delve into the causes, and provide practical techniques and code examples to help you diagnose and resolve them.
*1. Understanding the Different Types of OutOfMemoryError*
It's important to recognize that `OutOfMemoryError` isn't a single monolithic error. There are different variations, each pointing to a specific memory pool running out of space. Here's a breakdown of the most common types:
**`java.lang.OutOfMemoryError: Java heap space`**: This is the most frequently encountered OOM error. It indicates that the JVM's heap, where objects are allocated, is full. The garbage collector (GC) can't free up enough space to allocate new objects.
**`java.lang.OutOfMemoryError: GC overhead limit exceeded`**: This error occurs when the garbage collector is spending an excessive amount of time (by default, more than 98% of total time) trying to free very little memory (by default, less than 2% of the heap). This usually means that the application is spending almost all its time running the garbage collector but still isn't freeing up enough space, indicating a severe memory leak or very inefficient memory usage.
**`java.lang.OutOfMemoryError: Metaspace` (or `java.lang.OutOfMemoryError: PermGen space` in older Java versions before Java 8)**: Prior to Java 8, the `PermGen` space stored class definitions, interned strings, and other metadata. From Java 8 onwards, this space was replaced by `Metaspace`, which is part of native memory. This error means that the Metaspace (or PermGen) is full, typically due to lo ...
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