java resource_error ai_generated true

java.net.SocketException: Too many open files

ID: java/socketexception-too-many-open-files

Also available as: JSON · Markdown · 中文
85%Fix Rate
85%Confidence
1Evidence
2023-11-20First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
Java 8 active — — —
Java 11 active — — —
Java 17 active — — —
Java 21 active — — —
Linux kernel 5.x active — — —

Root Cause

The JVM process has exhausted the file descriptor limit set by the operating system, typically due to unclosed sockets, file streams, or other I/O resources in the application.

generic

中文

JVM 进程已耗尽操作系统设置的文件描述符限制，通常由应用程序中未关闭的套接字、文件流或其他 I/O 资源引起。

Official Documentation

https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/net/SocketException.html

Workarounds

  1. 90% success Use try-with-resources to ensure all Closeable resources (sockets, streams) are automatically closed. Review code for missing close() calls in finally blocks or using try-with-resources. 
    Use try-with-resources to ensure all Closeable resources (sockets, streams) are automatically closed. Review code for missing close() calls in finally blocks or using try-with-resources.
  2. 85% success Monitor the open file count using lsof on Linux to identify which resources are leaking. Use that information to fix the specific leak. 
    Monitor the open file count using lsof on Linux to identify which resources are leaking. Use that information to fix the specific leak.
  3. 75% success Temporarily increase the file descriptor limit for the JVM process using ulimit or systemd configuration, combined with a fix for the leak. 
    Temporarily increase the file descriptor limit for the JVM process using ulimit or systemd configuration, combined with a fix for the leak.

中文步骤

  1. Use try-with-resources to ensure all Closeable resources (sockets, streams) are automatically closed. Review code for missing close() calls in finally blocks or using try-with-resources.
  2. Monitor the open file count using lsof on Linux to identify which resources are leaking. Use that information to fix the specific leak.
  3. Temporarily increase the file descriptor limit for the JVM process using ulimit or systemd configuration, combined with a fix for the leak.

Dead Ends

Common approaches that don't work:

  1. 70% fail

    Increasing the file descriptor limit on the OS without fixing the leak only delays the crash; the leak continues.

  2. 85% fail

    Restarting the application temporarily frees descriptors but does not fix the root cause of resource leaks.

  3. 95% fail

    Adding more memory does not affect file descriptor limits; the issue is about OS limits, not heap.