原因：org.springframework.beans.factory.BeanCreationException：创建名称为“ mvcConversionService”的bean时出错

Question

我是Spring Boot的新手。我正在用Gradle Project创建一个简单的SpringBoot应用程序。我创建了两个模型。当我运行该应用程序时，它显示出这样的错误。

    Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter]: Factory method 'requestMappingHandlerAdapter' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mvcConversionService' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.format.support.FormattingConversionService]: Factory method 'mvcConversionService' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class org.apache.tomcat.jni.User
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:582) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    ... 18 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mvcConversionService' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.format.support.FormattingConversionService]: Factory method 'mvcConversionService' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class org.apache.tomcat.jni.User
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:590) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]

Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.format.support.FormattingConversionService]: Factory method 'mvcConversionService' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class org.apache.tomcat.jni.User
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class org.apache.tomcat.jni.User


> Task :bootRun FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':bootRun'.
> Process 'command '/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/bin/java'' finished with non-zero exit value 1

Application.java：

@SpringBootApplication
@EntityScan(basePackageClasses = {
        VirtualDoctorApplication.class,
        Jsr310JpaConverters.class
})
public class VirtualDoctorApplication {

    @PostConstruct
    void init() {
        TimeZone.setDefault(TimeZone.getTimeZone("UTC"));
    }
    public static void main(String[] args) {
        SpringApplication.run(VirtualDoctorApplication.class, args);
        System.out.println("hello world");
    }

这是我的build.gradle代码：

dependencies {
    compile('org.springframework.boot:spring-boot-starter-data-jpa')
    compile('org.springframework.boot:spring-boot-starter-security')
    compile("io.jsonwebtoken:jjwt:0.9.0")
    compile('com.fasterxml.jackson.datatype:jackson-datatype-jsr310')
    compile('org.springframework.boot:spring-boot-starter-web')
    runtime('org.postgresql:postgresql')
    testCompile('org.springframework.boot:spring-boot-starter-test')
    testCompile('org.springframework.security:spring-security-test')
}

项目结构

Answer 1

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class org.apache.tomcat.jni.User

这意味着您的JPA提供者不认为org.apache.tomcat.jni.User是JPA实体。这很可能意味着您需要修改

@EntityScan(basePackageClasses = {
        VirtualDoctorApplication.class,
        Jsr310JpaConverters.class
})

注释，它在org.apache.tomcat.jni.User属性中与basePackageClasses包含同一包中的至少一个类。快速而肮脏的测试方法是：

@EntityScan(basePackageClasses = {
        VirtualDoctorApplication.class,
        Jsr310JpaConverters.class,
        org.apache.tomcat.jni.User.class
})