无法从Java spring boot项目中的application.yml文件中读取用户定义类的列表

Question

大家好,

我最近在一个spring boot项目（版本2.3.4)中尝试从application.yml文件中读取内容。

最初，yml文件中的所有属性都被读取为NULL。

在多次清理和重建project之后，我可以读取所有属性，除了用户定义的类对象列表（类下的List )外，它仍然被读取为NULL。

我试过所有可能的解决办法，但没有一个对我有效。

请检查并帮助我理解我在下面的代码中遗漏了什么，因为list logComponents的值仍然从yml文件中读取为null？

在期待中感谢你！

配置Java类

    @Configuration
    @EnableConfigurationProperties
    @ConfigurationProperties
    public class TestAPIConfiguration {
     
        private String eventCache;
        
        private String diskBasedCache;
    
        private List<String> sendAllSMSto;
    
        private List<String> sendAllEmailsto;
        
        //This property is getting read as null even if
        //value for this property is present in yml file.
        private List<LogComponent> logComponents;
        
                
        @NotNull
        private String selfURIPrefix;
        
        @NotNull
        private String investURIPrefix;
        
        @NotNull
        private String ifaURIPrefix;
        
        private String apiEnv;
        
        private final Joiner joiner = Joiner.on( "," ).skipNulls();
        
        private static final Logger LOGGER = LoggerFactory.getLogger(TestAPIConfiguration.class);
        
        @PostConstruct
        public void setSystemProperties()
        {
            try
            {
                System.setProperty(SystemConstants.EVENT_CACHE_PATH, eventCache);
                System.setProperty(SystemConstants.DISK_BASED_CACHE_PATH, diskBasedCache);
                System.setProperty(SystemConstants.REQUEST_LOGGING_FIELDS, 
                        JSONUtils.getObjectMapper().writeValueAsString(logComponents));
                System.setProperty(SystemConstants.ENVIRONMENT_IDENTIFIER, apiEnv);
                System.setProperty(INVEST_URI_PREFIX, investURIPrefix);
                System.setProperty(IFA_URI_PREFIX, ifaURIPrefix);
                if(sendAllSMSto != null)
                    System.setProperty(SEND_ALL_SMS_TO, joiner.join(sendAllSMSto));
                if(sendAllEmailsto != null)
                    System.setProperty(SystemConstants.SEND_ALL_EMAILS_TO, joiner.join(sendAllEmailsto));
            }
            catch(Exception se)
            {
                LOGGER.error("Error in Configuration Setup: {}", se.getLocalizedMessage());
            }
        }
    
        public String getEventCache() {
            return eventCache;
        }
    
        public void setEventCache(String eventCache) {
            this.eventCache = eventCache;
        }
    
        public String getDiskBasedCache() {
            return diskBasedCache;
        }
    
        public void setDiskBasedCache(String diskBasedCache) {
            this.diskBasedCache = diskBasedCache;
        }
    
        public List getSendAllSMSto() {
            return sendAllSMSto;
        }
    
        public void setSendAllSMSto(List<String> sendAllSMSto) {
            this.sendAllSMSto = sendAllSMSto;
        }
    
        public List getSendAllEmailsto() {
            return sendAllEmailsto;
        }
    
        public void setSendAllEmailsto(List<String> sendAllEmailsto) {
            this.sendAllEmailsto = sendAllEmailsto;
        }
    
        public List getRequestLoggingFields() {
            return logComponents;
        }
    
        public void setRequestLoggingFields(List<LogComponent> requestLoggingFields) {
            this.logComponents = requestLoggingFields;
        }
    
        public String getSelfURIPrefix() {
            return selfURIPrefix;
        }
    
        public void setSelfURIPrefix(String selfURIPrefix) {
            this.selfURIPrefix = selfURIPrefix;
        }
    
        public String getInvestURIPrefix() {
            return investURIPrefix;
        }
    
        public void setInvestURIPrefix(String investURIPrefix) {
            this.investURIPrefix = investURIPrefix;
        }
    
        public String getIfaURIPrefix() {
            return ifaURIPrefix;
        }
    
        public void setIfaURIPrefix(String ifaURIPrefix) {
            this.ifaURIPrefix = ifaURIPrefix;
        }
    
        public String getApiEnv() {
            return apiEnv;
        }
    
        public void setApiEnv(String apiEnv) {
            this.apiEnv = apiEnv;
        }
    }

LogComponent Java类

    @Component
    public class LogComponent {
    
        @NotNull
        private  String headerName;
        @NotNull
        private  String sessionKey;
        @NotNull
        private  String logPrintKey;
        
        public String getHeaderName() {
            return headerName;
        }
        public String getSessionKey() {
            return sessionKey;
        }
        public String getLogPrintKey() {
            return logPrintKey;
        }   
    }

application.yml文件

    debug: true
    server:
       port: 8080
    apiEnv: UAT
    selfURIPrefix: "https://testurl.localhost.net"
    investURIPrefix: "https://testurl.mediaserver.net"
    ifaURIPrefix: "https://testurl.secondaryserver.net"
    sendAllSMSto:
       - "0000000000"
    sendAllEmailsto: 
       - "[e-mail]"
    eventCache: "C:\\Users\\username\\project\\devnull\\eventcachepurchase.mdb"
    diskBasedCache: "C:\\Users\\username\\project\\devnull\\cache.mdb"
    logComponents:
       - headerName: X-RT-REQUEST-TRACKER
         sessionKey: NOT AVAILABLE
         logPrintKey: REQUEST-TRACKER
       - headerName: X-RT-INX-DWD
         sessionKey: IFX-PDR
         logPrintKey: PDR_NO
       - headerName: X-RT-IFA-ARN
         sessionKey: IRX-AXRN
         logPrintKey: AXR-CDODEEE

Answer 1

终于找到了解决办法。

我没有在LogComponent类中创建setter方法，因为这些方法没有将值分配给变量。

在为所有字段添加setter之后，这个问题就解决了。