eclipse-vertx/vert.x · error · IllegalStateException

AsyncFile must only be used in the context that created it,

Error message

AsyncFile must only be used in the context that created it, expected: ${context} actual ${vertx.getContext()}

What it means

Context guard in AsyncFileImpl.checkContext: the AsyncFile is being used from a different Vert.x context than the one that created it. AsyncFile operations are bound to their creating context's event loop; the message reports both the expected and actual context to identify the misuse.

Source

Thrown at vertx-core/src/main/java/io/vertx/core/file/impl/AsyncFileImpl.java:519

      public void failed(Throwable t, Object attachment) {
        promise.fail(t);
      }
    });
  }

  private void check() {
    checkClosed();
  }

  private void checkClosed() {
    if (closed) {
      throw new IllegalStateException("File handle is closed");
    }
  }

  private void checkContext() {
    if (!vertx.getContext().equals(context)) {
      throw new IllegalStateException("AsyncFile must only be used in the context that created it, expected: "
          + context + " actual " + vertx.getContext());
    }
  }

  private void doClose(Promise<Void> handler) {
    context.<Void>executeBlockingInternal(() -> {
      ch.close();
      return null;
    }).onComplete(handler);
  }

  private synchronized void closeInternal(Promise<Void> handler) {
    check();

    closed = true;

    if (writesOutstanding == 0) {
      doClose(handler);

View on GitHub (pinned to fb308bd8c3)

Solutions

1. Use the AsyncFile only on the context (event loop) that created it
2. Pass data between contexts via eventBus or context.runOnContext instead of sharing the file object

When it happens

Trigger: Thrown at vertx-core/src/main/java/io/vertx/core/file/impl/AsyncFileImpl.java:519 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of eclipse-vertx/vert.x@fb308bd8c3 (2026-09-06). Data as JSON: /api/errors/49ae8855d7e98006. Report an issue: GitHub.