eclipse-vertx/vert.x · error · IllegalArgumentException

pipeliningLimit must be > 0

Error message

pipeliningLimit must be > 0

What it means

Configuration validation in Http1ClientConfig.setPipeliningLimit: the maximum number of pipelined requests pending on a single HTTP/1 connection must be at least 1. Zero or negative limits would deadlock pipelining, so the setter rejects the value.

Source

Thrown at vertx-core/src/main/java/io/vertx/core/http/Http1ClientConfig.java:137

    return this;
  }

  /**
   * @return the limit of pending requests a pipe-lined HTTP/1 connection can send
   */
  public int getPipeliningLimit() {
    return pipeliningLimit;
  }

  /**
   * Set the limit of pending requests a pipe-lined HTTP/1 connection can send.
   *
   * @param limit the limit of pending requests
   * @return a reference to this, so the API can be used fluently
   */
  public Http1ClientConfig setPipeliningLimit(int limit) {
    if (limit < 1) {
      throw new IllegalArgumentException("pipeliningLimit must be > 0");
    }
    this.pipeliningLimit = limit;
    return this;
  }

  /**
   * Set the maximum HTTP chunk size
   * @param maxChunkSize the maximum chunk size
   * @return a reference to this, so the API can be used fluently
   */
  public Http1ClientConfig setMaxChunkSize(int maxChunkSize) {
    this.maxChunkSize = maxChunkSize;
    return this;
  }

  /**
   * Returns the maximum HTTP chunk size
   * @return the maximum HTTP chunk size

View on GitHub (pinned to fb308bd8c3)

Solutions

1. Pass a positive limit (default 1, i.e. no pipelining)
2. Validate configuration values before applying them to the HTTP client

When it happens

Trigger: Thrown at vertx-core/src/main/java/io/vertx/core/http/Http1ClientConfig.java:137 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/51fd55a4119a7aa3. Report an issue: GitHub.