Spring lemon BeanCurrentlyInCreationException: Error creating bean

Question

I'm trying to follow this spring-lemon Getting started tutorial (https://naturalprogrammer.gitbooks.io/spring-lemon-getting-started/content/index.html), but I can't go further at a certain point. I created a new spring starter project (Spring boot), and I was able to add spring lemon to it. I did nothing else than following the instructions, but when I started maven build, the test failed with the following error:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'lmnDemoController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire method: public void com.naturalprogrammer.spring.lemon.LemonController.setLemonService(com.naturalprogrammer.spring.lemon.LemonService); nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'lmnDemoService': Bean with name 'lmnDemoService' has been injected into other beans [authenticationSuccessHandler] in its raw version as part of a circular reference, but has eventually been wrapped. This means that said other beans do not use the final version of the bean. This is often the result of over-eager type matching - consider using 'getBeanNamesOfType' with the 'allowEagerInit' flag turned off, for example.

My LmnDemoService.java is:

package com.example;

import org.springframework.stereotype.Service;
import com.naturalprogrammer.spring.lemon.LemonService;

@Service
public class LmnDemoService extends LemonService<User, Long> { 
    @Override
    protected User newUser() {
        return new User();
    }
}

It has nothing else just the lines the tutorial says. What am I missing?

EDIT:

LmndemoApplication.java

package com.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import com.naturalprogrammer.spring.lemon.LemonConfig;

@SpringBootApplication(scanBasePackageClasses = {LmndemoApplication.class, LemonConfig.class})
public class LmndemoApplication {

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

LmnDemoController.java

package com.example;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.naturalprogrammer.spring.lemon.LemonController;

@RestController
@RequestMapping("/api/core")
public class LmnDemoController extends LemonController<User, Long> {

}

LmnDemoService.java

package com.example;

import org.springframework.stereotype.Service;

import com.naturalprogrammer.spring.lemon.LemonService;

@Service
public class LmnDemoService extends LemonService<User, Long> {

    @Override
    protected User newUser() {
        return new User();
    }
}

SecurityConfig.java

package com.example;

import org.springframework.context.annotation.Configuration;

import com.naturalprogrammer.spring.lemon.security.LemonSecurityConfig;

@Configuration
public class SecurityConfig extends LemonSecurityConfig {

}

ServletInitializer.java

package com.example;

import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.context.web.SpringBootServletInitializer;

public class ServletInitializer extends SpringBootServletInitializer {

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(LmndemoApplication.class);
    }

}

User.java

package com.example;

import javax.persistence.Entity;
import javax.persistence.Table;

import com.naturalprogrammer.spring.lemon.domain.AbstractUser;

@Entity 
@Table(name="usr")
public class User extends AbstractUser<User,Long> {

    private static final long serialVersionUID = 2716710947175132319L;

}

UserRepository.java

package com.example;

import com.naturalprogrammer.spring.lemon.domain.AbstractUserRepository;

public interface UserRepository extends AbstractUserRepository<User, Long> {

}

application.properties

#Database configuration
spring.jpa.database: MYSQL
spring.jpa.hibernate.ddl-auto: update

spring.datasource.url: jdbc:mysql://localhost:3306/mydatabase
spring.datasource.username: myuser
spring.datasource.password: mypassword

#DevTools configuration
spring.devtools.livereload.enabled: false
spring.devtools.restart.enabled: false

#Application URL
#lemon.application-url: http://localhost:9000

#reCAPTCHA configuration
#lemon.recaptcha.sitekey: your google recaptcha site key
#lemon.recaptcha.secretkey: your google recaptcha secret key

#Remember me configuration
#lemon.remember-me-key: someSecret

#First administrator
lemon.admin.username: admin@example.com
lemon.admin.password: admin

#Email configuration
#spring.mail.host = smtp.gmail.com
#spring.mail.username = xxxxxx@gmail.com
#spring.mail.password = xxxxxx
#
#spring.mail.properties.mail.smtp.auth = true
#spring.mail.properties.mail.smtp.socketFactory.port = 465
#spring.mail.properties.mail.smtp.socketFactory.class =        javax.net.ssl.SSLSocketFactory
#spring.mail.properties.mail.smtp.socketFactory.fallback = false
#spring.mail.properties.mail.smtp.ssl.enable = true

#Handling cross origin requests configuration
#lemon.cors.allowed-origins: http://localhost:9000

#This will disable the protection against JSON vulnerability
#lemon.enabled.json-prefix: false

pom.xml

http://maven.apache.org/xsd/maven-4.0.0.xsd"> 4.0.0

<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>

<name>lmndemo</name>
<description>Demo project for Spring Boot</description>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.3.3.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <java.version>1.8</java.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-tomcat</artifactId>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>

    <!-- Spring-lemon -->
    <dependency>
        <groupId>com.naturalprogrammer.spring</groupId>
        <artifactId>spring-lemon</artifactId>
        <version>0.8.5</version><!-- See https://github.com/naturalprogrammer/spring-lemon/releases for latest release -->
    </dependency>
</dependencies>

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

Answer 1

Looks to me like a circular reference issue. It's not happening in my environment, and I think ideally Spring should have been able to resolve it itself, but best would be to fix Spring Lemon code to make it more robust, I think.

So, can you try adding a @Lazy annotation on the setLemonService method of the AuthenticationSuccessHandler class in the checked out Spring Lemon code in your workspace? Make it look as below:

@Autowired
@Lazy // add this line
public void setLemonService(LemonService<?, ?> lemonService) {
    this.lemonService = lemonService;
}

I haven't tried @Lazy before, but I think it should work. If not, we'll need to think another way to break the circular dependency.

Let me know. After a solution is found, I'll check in the fix to Spring Lemon repository.