Cannot invoke "org.springframework.cloud.netflix.eureka.CloudEurekaClient.getApplications()" - spring

Question

I updated Gradle configuration to the latest Spring Cloud version and Spring version:
plugins {
id 'org.springframework.boot' version '2.5.5'
id 'io.spring.dependency-management' version '1.0.11.RELEASE'
id 'java'
}
group = 'com.test'
version = '0.0.1'
sourceCompatibility = '11'
repositories {
mavenCentral()
}
ext {
set('springCloudVersion', "2020.0.4")
}
dependencies {
implementation 'org.springframework.boot:spring-boot-starter-web'
implementation 'org.springframework.cloud:spring-cloud-starter-openfeign'
implementation 'org.springframework.cloud:spring-cloud-starter-loadbalancer'
implementation 'com.netflix.eureka:eureka-core'
implementation 'org.springframework.cloud:spring-cloud-starter-netflix-eureka-client'
implementation 'org.springframework.boot:spring-boot-starter-validation'
implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
implementation 'javax.validation:validation-api'
implementation 'org.hibernate.validator:hibernate-validator'
testImplementation 'org.springframework.boot:spring-boot-starter-test'
implementation 'org.threeten:threetenbp:1.5.1'
implementation 'org.springframework.boot:spring-boot-starter-actuator'
// Lombok
compileOnly 'org.projectlombok:lombok:1.18.20'
annotationProcessor 'org.projectlombok:lombok:1.18.20'
testCompileOnly 'org.projectlombok:lombok:1.18.20'
testAnnotationProcessor 'org.projectlombok:lombok:1.18.20'
// Mapstruct
implementation 'org.mapstruct:mapstruct:1.4.2.Final'
annotationProcessor 'org.mapstruct:mapstruct-processor:1.4.2.Final'
runtimeOnly 'org.postgresql:postgresql'
// Swagger
implementation group: 'io.springfox', name: 'springfox-swagger2', version: '3.0.0'
implementation 'org.liquibase:liquibase-core'
}
dependencyManagement {
imports {
mavenBom "org.springframework.cloud:spring-cloud-dependencies:${springCloudVersion}"
}
}
test {
useJUnitPlatform()
}
But when I start the application I get:
10:11:27.970 [main] ERROR SpringApplication[reportFailure:843] - Application run failed
org.springframework.context.ApplicationContextException: Failed to start bean 'eurekaAutoServiceRegistration'; nested exception is java.lang.NullPointerException: Cannot invoke "org.springframework.cloud.netflix.eureka.CloudEurekaClient.getApplications()" because the return value of "org.springframework.cloud.netflix.eureka.serviceregistry.EurekaRegistration.getEurekaClient()" is null
at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:181)
at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:54)
at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:356)
at java.base/java.lang.Iterable.forEach(Iterable.java:75)
at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:155)
at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:123)
at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:935)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:586)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:434)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:338)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1343)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1332)
at org.MerchantHubApplication.main(MerchantHubApplication.java:18)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49)
at org.springframework.boot.loader.Launcher.launch(Launcher.java:108)
at org.springframework.boot.loader.Launcher.launch(Launcher.java:58)
at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:88)
Caused by: java.lang.NullPointerException: Cannot invoke "org.springframework.cloud.netflix.eureka.CloudEurekaClient.getApplications()" because the return value of "org.springframework.cloud.netflix.eureka.serviceregistry.EurekaRegistration.getEurekaClient()" is null
at org.springframework.cloud.netflix.eureka.serviceregistry.EurekaServiceRegistry.maybeInitializeClient(EurekaServiceRegistry.java:54)
at org.springframework.cloud.netflix.eureka.serviceregistry.EurekaServiceRegistry.register(EurekaServiceRegistry.java:38)
at org.springframework.cloud.netflix.eureka.serviceregistry.EurekaAutoServiceRegistration.start(EurekaAutoServiceRegistration.java:83)
at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:178)
... 22 common frames omitted
application.yml configuration:
eureka:
client:
serviceUrl:
defaultZone: ${EUREKA_URI:http://localhost:8761/eureka}
fetchRegistry: true
healthcheck:
enabled: true
instance:
preferIpAddress: true
leaseRenewalIntervalInSeconds: 10
Do you know what might be the issue?

Answer 1

Some times it happens from of JRE version:
May your compile-time JDK version and Runtime JDK version be different.
Like: Compile-time JDK 11 and Runtime JDK 17.
Runtime JRE will be same as Compile-time.

Answer 2

you must added it in Gradle config i dont now how you can add like it inside your Gradle configuration but i have the same problem with maven project i added this inside pom.xml with
when added it without <dependencyManagement> i see same your problem
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
but after added below config i run project and registry in eureka without any problem
<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>
i think this solution help you to solution your problem but you must convert it from maven to Gradle

Answer 3

I think your issue come from the version of your spring could vs your spring boot version try to update both to the following version
id 'org.springframework.boot' version '2.5.10-SNAPSHOT'
set('springCloudVersion', "2020.0.5")

Answer 4

In my case, the version 2.2.5.RELEASE caused the error.
Therefore, I try to change it into 3.1.3 like below, then it runs without any problem.
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
<version>3.1.3</version>
</dependency>

Answer 5

I had the same problem with running my project. If you are working on IntellijIDE you need to check: File -> Project Structure -> Project: here you need to check your SDK and Language level to be the same as in your pom file