Web Reference: Among these, ‘java.lang.OutOfMemoryError: Direct buffer memory’ is starting to appear in modern JVMs and Spring Boot framework. In this post, we’ll delve into the root causes behind this error, explore potential solutions, and discuss effective diagnostic methods to troubleshoot this problem. Jan 7, 2020 · When the GC detects that a DirectByteBuffer is no longer referenced, a Cleaner is used to free the native memory. However, this happens in the post-collection phase, so if the demand for / turnover of direct buffers is too great, it is possible that the collector won't be able to keep up. Jan 16, 2026 · This blog dives deep into why this discrepancy exists, exploring JVM internals, direct buffer allocation mechanisms, and error-handling paths. By the end, you’ll understand the root cause, how to reproduce the issue, and strategies to ensure your application exits reliably when facing direct buffer OOMs.
YouTube Excerpt: Learn from this Course: https://ycrash.io/java-performance-training There are 9 types of java.lang.
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