错误记录关于Model 的Not a managed type: class,无法找到Model

蔚落 2021-12-10 05:51 200阅读 0赞

org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘customerController’: Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘customerServiceImpl’: Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘customerRepo’: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class tonel.model.CustomersEntity

## 一、解决，添加 @EntityScan(“tonel.model”) 注解，即可解决 ##

多种方式，可以多个包扫描

@SpringBootApplication
    @EntityScan(basePackages ={ "tonel.model","tonels.qbe.model"})
    //@SpringBootApplication(scanBasePackages = {"org.ashu.java.*"})
    //@EnableJpaRepositories(basePackages ={ "org.ashu.java.*"})
    //@EntityScan(basePackages ={ "org.ashu.java.*"})
    public class QbeApp {
        public static void main(String[] args) {
            ConfigurableApplicationContext run = SpringApplication.run(QbeApp.class);
        }
    }

## 二、思考，源码 ##

/*
     * Copyright 2012-2017 the original author or authors.
     *
     * Licensed under the Apache License, Version 2.0 (the "License");
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     *
     *      http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */
    
    package org.springframework.boot.autoconfigure.domain;
    
    import java.lang.annotation.Documented;
    import java.lang.annotation.ElementType;
    import java.lang.annotation.Retention;
    import java.lang.annotation.RetentionPolicy;
    import java.lang.annotation.Target;
    
    import org.springframework.context.annotation.Import;
    import org.springframework.core.annotation.AliasFor;
    
    
    @Target(ElementType.TYPE)
    @Retention(RetentionPolicy.RUNTIME)
    @Documented
    @Import(EntityScanPackages.Registrar.class)
    public @interface EntityScan {
    	/**
    	 * Alias for the {@link #basePackages()} attribute. Allows for more concise annotation
    	 * declarations e.g.: {@code @EntityScan("org.my.pkg")} instead of
    	 * {@code @EntityScan(basePackages="org.my.pkg")}.
    	 * @return the base packages to scan
    	 */
    	@AliasFor("basePackages")
    	String[] value() default {};
    
    	/**
    	 * Base packages to scan for entities. {@link #value()} is an alias for (and mutually
    	 * exclusive with) this attribute.
    	 * <p>
    	 * Use {@link #basePackageClasses()} for a type-safe alternative to String-based
    	 * package names.
    	 * @return the base packages to scan
    	 */
    	@AliasFor("value")
    	String[] basePackages() default {};
    
    	/**
    	 * Type-safe alternative to {@link #basePackages()} for specifying the packages to
    	 * scan for entities. The package of each class specified will be scanned.
    	 * <p>
    	 * Consider creating a special no-op marker class or interface in each package that
    	 * serves no purpose other than being referenced by this attribute.
    	 * @return classes from the base packages to scan
    	 */
    	Class<?>[] basePackageClasses() default {};
    
    }

## 三、出现场景，我从一个别的Module中引入的common Module的Entity，出现的错误，从当前Module不会出现这个问题。 ##