Java ‘outofmemoryerror’: How To Diagnose And Fix

Java ‘outofmemoryerror’: How to Diagnose and Fix



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  • Monitor memory usage with tools like JVisualVM or VisualVM to track memory consumption and identify potential leaks.
  • Analyze heap dumps using tools such as MAT (Memory Analyzer Tool) to pinpoint objects consuming excessive memory.

Possible Causes:


  • Memory leaks: Objects that are not garbage collected and continue to occupy memory. Common causes include static references, object instances being referenced from multiple places, or misconfigured thread pools.
  • Excessive object creation: Rapid creation of a large number of objects can exhaust memory, especially in applications that process significant amounts of data.
  • Memory-intensive operations: Certain operations, such as sorting large datasets, may consume significant memory resources temporarily.


  • Identify and fix memory leaks:
    • Analyze heap dumps to identify retained objects.
    • Use tools like FindBugs or PMD to detect potential thread pool issues.
  • Optimize object creation:
    • Cache frequently used objects.
    • Consider pooling or reusing objects instead of creating new ones.
    • Use primitive types when possible instead of objects.
  • Handle memory-intensive operations efficiently:
    • Break down large operations into smaller chunks.
    • Consider using parallel processing to distribute memory usage across multiple threads.
  • Increase Java heap memory:
    • Set the -Xms and -Xmx JVM arguments to allocate a larger memory heap for the application.
    • Note that blindly increasing heap size may not solve all memory issues and can introduce performance problems.

Additional Tips:

  • Implement a graceful shutdown mechanism to ensure proper cleanup and release of resources.
  • Monitor memory usage regularly and set up alerts to notify when thresholds are exceeded.
  • Use memory profiling techniques to track memory allocation and identify performance bottlenecks early on.## Java ‘outofmemoryerror’: How to Diagnose and Fix

In the bustling world of software development, one dreaded error that can send shivers down a coder’s spine is the ‘outofmemoryerror’ in Java. Encountering this error can be disheartening, but tackling it with the right approach and thorough understanding can turn the situation around. In this comprehensive article, we’ll unravel the enigma of Java’s ‘outofmemoryerror’, providing a detailed guide to diagnose and resolve this issue, empowering you to overcome this obstacle with confidence.


A Java ‘outofmemoryerror’ occurs when the Java Virtual Machine (JVM) runs out of memory while executing a program. This error can manifest itself in various ways, often leaving developers scratching their heads, wondering how to proceed. We’ll delve into the root causes of this error and equip you with the knowledge to pinpoint its origin and apply effective remedies.

Understand the Heap and Memory Allocation

To address the ‘outofmemoryerror’ effectively, it is essential to grasp the concept of the heap in Java. The heap is a portion of memory that stores objects created during program execution. As new objects are created, they are allocated space on the heap. However, if the heap runs out of space, the ‘outofmemoryerror’ is thrown. Understanding memory allocation and garbage collection in Java is crucial to managing memory usage efficiently.

Detecting and Diagnosing the Error

Pinpointing the root cause of the ‘outofmemoryerror’ is the key to resolving it. Java provides several tools and techniques to aid in this process. Let’s explore some of the common approaches:

  • Monitoring Memory Usage: Tools like VisualVM or jconsole can provide real-time insights into memory usage, enabling you to identify potential memory leaks or excessive memory consumption patterns.
  • Analyzing Heap Dumps: Generating heap dumps at the time of the error can offer a detailed snapshot of the heap’s contents, allowing you to analyze object allocation and identify potential memory hogs.
  • Using Logging and Profiling: Logging memory-related events and profiling the application’s memory usage can help identify possible sources of memory leaks and bottlenecks.

Resolving the ‘outofmemoryerror’

Once the root cause of the ‘outofmemoryerror’ is identified, it’s time to devise a plan to tackle it. Several techniques can be employed to resolve this error:

  • Optimizing Memory Usage: Reviewing code to identify and eliminate memory leaks, optimizing data structures, and utilizing memory-efficient algorithms can significantly reduce memory consumption.
  • Adjusting Heap Size: Increasing the maximum heap size allocated to the JVM can alleviate the ‘outofmemoryerror’, but it’s crucial to strike a balance and avoid excessive memory usage.
  • Employing Caching Mechanisms: Implementing caching techniques can reduce the frequency of object creation and improve memory efficiency.
  • Utilizing Native Memory: In scenarios where Java’s memory management proves limiting, leveraging native memory management techniques can provide greater control and flexibility.


Conquering the ‘outofmemoryerror’ in Java demands a comprehensive approach that encompasses diagnosing the root cause and applying appropriate resolutions. By harnessing the techniques outlined in this article, developers can effectively tackle this error, optimize memory utilization, and ensure the smooth execution of their Java applications. Remember, with perseverance and a deep understanding of Java’s memory management system, you can confidently overcome this challenge and emerge victorious in your software development endeavors.

Keyword Phrase Tags:

  • Java ‘outofmemoryerror’
  • Memory Management
  • Heap Analysis
  • Memory Leaks
  • Performance Optimization
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Comments 10
  1. This is a very informative article. I learned a lot about how to diagnose and fix Java ‘outofmemoryerror’ errors. Thanks for sharing!

  2. I’m not sure how helpful this article will be. It seems like it’s just a rehash of information that’s already available online.

  3. This article provides a good overview of the causes of Java ‘outofmemoryerror’ errors and how to fix them. I would recommend it to anyone who is experiencing these errors.

  4. I disagree with the author’s conclusion that the best way to fix ‘outofmemoryerror’ errors is to increase the heap size. I believe that it is better to find and fix the root cause of the error.

  5. This article is a great example of how to write about a technical topic in a way that is both clear and concise. Ironic, isn’t it?

  6. I’m not sure what’s worse: the fact that I’m getting ‘outofmemoryerror’ errors or the fact that I have to read this article to fix them.

  7. This article provides a good overview of the causes of Java ‘outofmemoryerror’ errors and how to fix them. I would recommend it to anyone who is experiencing these errors.

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