java - 在 Java 中绑定 Yaml 属性时出现异常
问题描述
我想要激活的是来自YAML
文件的类似内容
System.out.println("US City====>"+addressProperties.getFromaddress().get("US").getCity());
System.out.println("US City====>"+addressProperties.getFromaddress().get("US").getCountry());
System.out.println("US City====>"+addressProperties.getFromaddress().get("US").getPostalCode());
System.out.println("DE City====>"+addressProperties.getFromaddress().get("DE").getCity());
System.out.println("DE City====>"+addressProperties.getFromaddress().get("DE").getCountry());
System.out.println("DE City====>"+addressProperties.getFromaddress().get("DE").getPostalCode());
我有一个如下所示的 yaml 文件内容
address:
fromaddress:
US:
country: US
city: New York
postalcode: 44444
region: NY
DE:
country: DE
city: Munich
postalcode: 33333
region: BE
:
:
:
:
我已经为上述山药内容创建了 DTO,如下所示
@Data
public abstract class AddressProperties extends HashMap<String, FromAddress> {
}
@Data
@Builder
public class FromAddress
{
private String country;
private String city;
private String postal;
private String region;
}
@Data
@ConfigurationProperties(prefix = ”address”)
@Service
public class FromAddressProperties
{
public AddressProperties fromaddress;
}
但我收到以下异常
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘addressService' defined in file [/Users/xxxx/xxxx/workspaces/xxxx/target/classes/com/xxx/liita/xxxx/services/AddressService.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘fromAddressProperties': Could not bind properties to FromAddressProperties (prefix=address, ignoreInvalidFields=false, ignoreUnknownFields=true, ignoreNestedProperties=false); nested exception is org.springframework.beans.InvalidPropertyException: Invalid property 'fromaddress[US]' of bean class [com.xxx.xxx.xxx.xxx.AddressProperties]: Illegal attempt to get property 'fromaddress' threw exception; nested exception is org.springframework.beans.NullValueInNestedPathException: Invalid property 'fromaddress' of bean class [com.xxx.xxx.xxx.xxx.FromAddressProperties]: Could not instantiate property type [com.xxx.xxx.xxx.xxx.FromAddressProperties] to auto-grow nested property path; nested exception is java.lang.IllegalArgumentException: Could not instantiate Map type: com.xxx.xxx.xxx.domains.FromAddressProperties
bean 类 [com.xxx.xxx.xxx.xxx.AddressProperties] 的无效属性 'fromaddress[US]':非法尝试获取属性 'fromaddress' 引发异常
任何人都可以帮我解决这个问题,想知道我哪里出错了
更新 1
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 http://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>1.5.9.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.xxxxx</groupId>
<artifactId>xxxx-xxxxxx</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>xxx-xxxxx</name>
<description>Sample Test</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Dalston.SR4</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>2.7.0</version>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>2.7.0</version>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-feign</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.16.12</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
解决方案
只需简单地将@NoArgsConstructor
,添加@AllArgsConstructor
到您的FromAddress中,因为 spring 需要默认构造函数和所有 arg 构造函数来实例化FromAddress。
@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
public class FromAddress
{
private String country;
private String city;
private String postal;
private String region;
}
也abstract
从AddressProperties类中删除,如下所示
@Data
public class AddressProperties extends HashMap<String, FromAddress> {
}
休息一切看起来都很好
推荐阅读
- flutter - 面向最低版本的 Flutter 包
- reactjs - 如何将参数传递给 React 中的动态组件?
- tableau-api - 如何在 Tableau 的条形图中获取总不同计数?
- python - 如何使用键盘 onScreen 将文本插入 QLineEdit
- powerbi - 在powerbi中将数值类型2000.50转换为2000/09/30数据格式
- libgdx - 如何设置纹理过滤器
- apache-spark - spark sql 百分位数函数和 spark dataframe quantilediscretizer 之间有什么区别?
- reactjs - React:尝试选择哪种数据源和状态管理解决方案对于这种情况最有效
- python - 使用熊猫从列表中删除重复项
- reactjs - 有没有更简单的方法来编写这个 React 代码