Spring boot Controller is reusing same HttpServletRequest install for all requests (deployed on Tomcat) - spring-boot

Question

Hi have spring boot project and controller like this
#RestController
#RequestMapping(value= "/test")
public class AuthenticationController {
#RequestMapping(value = "/ping", method = RequestMethod.GET)
public String ping(HttpServletRequest request) {
String result = "HttpServletRequest.hashCode(): " + request.hashCode();
return result;
}
}
All requests from REST client of browser to API /test/ping return same value for HttpServletRequest.hashCode().
Why does it happen? I researched tons of information on the internet, but can't find the reason of that.
The only info I found says "servlet container to create and manage HttpServletRequest and response objects and reuse them". But it has to be not all the time, it happens each request, no matter how much I wait.
Below some setup info:
Deployed on Tomcat 8.5
servlet.xml
<Connector SSLEnabled="true" acceptCount="100" compression="on" disableUploadTimeout="true" enableLookups="false"
maxHttpHeaderSize="8192" maxThreads="550" minSpareThreads="25" port="443"
protocol="org.apache.coyote.http11.Http11NioProtocol" scheme="https" secure="true"
sslImplementationName="org.apache.tomcat.util.net.openssl.OpenSSLImplementation">
<UpgradeProtocol className="org.apache.coyote.http2.Http2Protocol"/>
<SSLHostConfig certificateVerification="none"
ciphers="TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_DHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA"
protocols="TLSv1.2">
<Certificate
certificateKeyAlias="*hidden"
certificateKeystoreFile="hidden"
certificateKeystorePassword="hidden" type="RSA" />
</SSLHostConfig>
  
</Connector>
Host
<Host appBase="hidden" name="hidden.net">
<Context docBase="../somewebapp" path="/webapp" reloadable="false"/>
</Context>
</Host>
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>**hidden**</groupId>
<artifactId>**hidden**</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>**hidden**</name>
<description>**hidden**</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.5.RELEASE</version>
<relativePath/>
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- Tests: Selenium & TestNG -->
<dependency>
<groupId>org.seleniumhq.selenium</groupId>
<artifactId>selenium-java</artifactId>
<version>2.53.0</version>
</dependency>
<dependency>
<groupId>org.testng</groupId>
<artifactId>testng</artifactId>
<version>6.9.10</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.12.4</version>
<configuration>
<suiteXmlFiles>
<suiteXmlFile>src\test\resources\suites\RegressionSuite.xml</suiteXmlFile>
</suiteXmlFiles>
</configuration>
</plugin>
</plugins>
</build>
</project>