RetrieveRecordedRequests does not return all requests when request Body matcher is used

[narras-oss]

Reproducer program below. After upgrading from 5.9 version to 5.12 , started noticing this issue with retrieving recorded requests (active_expectation works fine) being less than the actual requests made. This only happens when request matcher has Body match with substring.

package com.vmware.vidm;

import static org.mockserver.model.StringBody.subString;

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpResponse.BodyHandlers;
import java.util.UUID;
import org.apache.commons.lang3.RandomStringUtils;
import org.apache.commons.lang3.RandomUtils;
import org.mockserver.client.MockServerClient;
import org.mockserver.model.HttpRequest;
import org.mockserver.model.HttpResponse;

public class MockServerTest {
  protected static MockServerClient mockServerClient;

  public static void main(String[] args) throws Exception {
    /// Start mockserver with command line "java -jar ~/Downloads/mockserver-netty-5.12.0-shaded.jar -serverPort 50055"
    mockServerClient = new MockServerClient("localhost", 50055);

    HttpClient client = HttpClient.newHttpClient();
    String[] names = new String[100];
    for (int i = 0; i < 100; i++) {
      final String name = "MyAttribute-" + RandomStringUtils.randomAlphabetic(21);
      names[i] = name;
      mockServerClient.when(HttpRequest.request().withPath("/test/path")
              .withMethod("POST")
              .withBody(subString(name)))
          .respond(HttpResponse.response().withBody("\"schemas\" : [ \"urn:AttributeAlias\" ],\n"
              + "      \"externalId\" : \"bf5089b9-ba16-439a-bcfd-200f71df8e35\",\n"
              + "      \"id\" : \"" + UUID.randomUUID() + "\",\n"
              + "      \"name\" : \"" + name + "\",\n"
              + "      \"standard\" : true,\n"
              + "      \"scimExpression\" : \"urn:ietf:params:scim:schemas:core:2.0:User:" + name + "\""));
    }
    for (int i = 0; i < 100; i++) {
      java.net.http.HttpRequest request = java.net.http.HttpRequest.newBuilder()
          .uri(URI.create("http://localhost:50055/test/path"))
          .header("Authorization", "HZN dummytoken")
          .POST(java.net.http.HttpRequest.BodyPublishers.ofString("\"schemas\" : [ \"urn:AttributeAlias\" ],\n"
              + "      \"externalId\" : \"bf5089b9-ba16-439a-bcfd-200f71df8e35\",\n"
              + "      \"name\" : \"" + names[i] + "\",\n"
              + "      \"standard\" : true,\n"
              + "      \"scimExpression\" : \"urn:ietf:params:scim:schemas:core:2.0:User:" + names[i] + "\""))
          .build();
      java.net.http.HttpResponse<String> response = client.send(request, BodyHandlers.ofString());
      if (response.statusCode() != 200) {
        throw new RuntimeException("Failed request status code: " + response.statusCode());
      }
    }
    HttpRequest[] requests = mockServerClient.retrieveRecordedRequests(HttpRequest.request().withPath("/test/path")
        .withMethod("POST"));
    if (requests.length != 100) {
      throw new RuntimeException("Captured request count: " + requests.length);
    };
  }

}

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>org.example</groupId>
  <artifactId>mockservertest</artifactId>
  <version>1.0-SNAPSHOT</version>

  <properties>
    <maven.compiler.source>11</maven.compiler.source>
    <maven.compiler.target>11</maven.compiler.target>
  </properties>
  <dependencies>
    <dependency>
      <groupId>org.mock-server</groupId>
      <artifactId>mockserver-core</artifactId>
      <version>5.12.0</version>
    </dependency>
    <dependency>
      <groupId>org.mock-server</groupId>
      <artifactId>mockserver-client-java</artifactId>
      <version>5.12.0</version>
    </dependency>
    <dependency>
      <groupId>org.mock-server</groupId>
      <artifactId>mockserver-netty</artifactId>
      <version>5.12.0</version>
    </dependency>
  </dependencies>

</project>

Output: Exception in thread "main" java.lang.RuntimeException: Captured request count: 69 at com.vmware.vidm.MockServerTest.main(MockServerTest.java:54)

[narras-oss]

When i try with version 5.14 i cannot reproduce this issue (i.e missing requests in RetrieveRecordedRequests) but after 200 or so requests, we start seeing timeouts from mockserver. In version 5.9 , i tried this up to 7000 requests without any problems.