Spring Cloud sleuth memory leak issue

Question

I am facing issue with spring cloud sleuth as it is leaking memory as I have gone through the dumps of my applications:

What does 13.05mb (40.3%) of Java Static org.springframework.cloud.sleuth.instrument.async.SleuthContextListener.CACHE

Spring Cloud Version: Hoxton.SR8 Spring Boot Version: 2.3.3.RELEASE

Please find the heapdump report below:

https://heaphero.io/my-heap-report.jsp?p=YXJjaGl2ZWQvMjAyMS8wNS8yNS8tLWhlYXBkdW1wLTE2MjE5MjE0MzYyNTMuaHByb2YtNS00Ni0xLmpzb24=

pls find the code repo below, which I am using in my appplication, Also on first run there is no memory leakage issue but on successive runs it shows the memory leakage issue as mentioned in the heapdump report

   package com.example.demo;

import java.util.Date;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.Scheduled;

@SpringBootApplication
@EnableCaching
@EnableScheduling
public class DemoApplication {

    Logger log = LoggerFactory.getLogger(DemoApplication.class);

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

    @CacheEvict(cacheNames = { "config1", "config2" }, allEntries = true)
    @Scheduled(fixedDelay = 60000 * 5)
    public void cacheEvict() {
        log.info("Evicting all cache at: {}", new Date());
    }

}

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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.4.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.demo</groupId>
    <artifactId>demo-service</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo-service</name>
    <description>demo</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.amazonaws/aws-java-sdk-ses -->
        <dependency>
            <groupId>com.amazonaws</groupId>
            <artifactId>aws-java-sdk-ses</artifactId>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.mail/javax.mail-api -->
        <dependency>
            <groupId>com.sun.mail</groupId>
            <artifactId>javax.mail</artifactId>
            <version>1.6.0</version>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>2.9.2</version>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.9.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.amqp</groupId>
            <artifactId>spring-rabbit</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.ht</groupId>
            <artifactId>subscription-core-library</artifactId>
            <version>0.1</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>de.codecentric</groupId>
            <artifactId>spring-boot-admin-starter-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-sleuth</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zipkin</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
    <repositories>

        <repository>
            <id>subscription-core-library-stg</id>
            <name>subscription-core-library-stg</name>
            <url>${repo.url}</url>
        </repository>

    </repositories>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Greenwich.SR4</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>de.codecentric</groupId>
                <artifactId>spring-boot-admin-dependencies</artifactId>
                <version>2.1.6</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
</project>

TIA

Answer 1

You have a complete mix of versions. Why do you say that you're using Hoxton and Boot 2.3 if you're not using Hoxton, you're using Greenwich and Boot 2.1

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.4.RELEASE</version>
    <relativePath /> <!-- lookup parent from repository -->
</parent>

<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>Greenwich.SR4</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>

Please upgrade to the latest version of Sleuth and Boot. Please replicate this issue by going to start.spring.io and generating a new, fresh project.

Update:

With the 2020.0.3 release I've changed one class that used to cache a bean factory in such a way that now it stores a hash of that class.