NoSuchMethodException in resilience4j fallback with spring boot

Question

I am new to this circuit breaking technology. I tried to implement this technology with eureka server but get stuck at this fallback method point.

my 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>2.2.10.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.microservice</groupId>
<artifactId>inventory-client</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>inventory-client</name>
<description>Demo microservice project for Spring Boot</description>

<properties>
    <java.version>1.8</java.version>
    <spring-cloud.version>Hoxton.SR8</spring-cloud.version>
</properties>

<dependencies>
    <!-- <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency> -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-aop</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>
    <dependency>
        <groupId>io.github.resilience4j</groupId>
        <artifactId>resilience4j-spring-boot2</artifactId>
        <version>1.3.1</version>
    </dependency>
    <dependency>
        <groupId>io.github.resilience4j</groupId>
        <artifactId>resilience4j-circuitbreaker</artifactId>
        <version>1.3.1</version>
    </dependency>
    

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <scope>runtime</scope>
    </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>
        <exclusions>
            <exclusion>
                <groupId>org.junit.vintage</groupId>
                <artifactId>junit-vintage-engine</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
</dependencies>

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>${spring-cloud.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

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

my application.properties

spring.application.name=inventory-client-app
server.port=8081

spring.cloud.circuitbreaker.resilience4j.enabled=false

resilience4j.circuitbreaker.instances.itemTypesBreaker.registerHealthIndicator=true
resilience4j.circuitbreaker.instances.itemTypesBreaker.slidingWindowSize=10
resilience4j.circuitbreaker.instances.itemTypesBreaker.permittedNumberOfCallsInHalfOpenState=3
resilience4j.circuitbreaker.instances.itemTypesBreaker.slidingWindowType=TIME_BASED
resilience4j.circuitbreaker.instances.itemTypesBreaker.minimumNumberOfCalls=20
resilience4j.circuitbreaker.instances.itemTypesBreaker.waitDurationInOpenState=50s
resilience4j.circuitbreaker.instances.itemTypesBreaker.failureRateThreshold=50
resilience4j.circuitbreaker.instances.itemTypesBreaker.eventConsumerBufferSize=10

my controller

import io.github.resilience4j.circuitbreaker.annotation.CircuitBreaker;

@RestController
@RequestMapping("/inventory-client")
public class ItemTypeController {

@Autowired
RestTemplate restTemplate;


@GetMapping("/item-types")
@ResponseStatus(HttpStatus.OK)
@CircuitBreaker(name="itemTypesBreaker",fallbackMethod = "itemTypesFallBack")
public List<ItemType> getAllItemTypes(){
    List<ItemType> itemTypeList = (List<ItemType>) restTemplate.getForObject("http://inventory-catalog-app/inventory-catalog/item-types/", ItemType.class);
    return itemTypeList;
}

private String itemTypesFallBack(Throwable t){

    return "Item Catalog is down";
    
}

}

I cannot call this endpoint with fallback method, what other configuration do I missing? . Thanks in advance.

Answer 1

I have found a solution. The fallback method signatures should be like this.

private List<ItemType> itemTypesFallBack(Throwable t){
    System.out.println("Item Catalog is down");
    return null;

}