我正在開發一個 Spring Batch 應用程式，我試圖使用在我的專案application.properties檔案中定義的占位符來外部化我的 CRON 運算式（用于定義何時啟動一個方法）。
所以最初我用@Scheduled注釋對這個方法進行了注釋，將 CRON 運算式直接定義到方法中（它作業正常）是這樣的：
@Scheduled(cron = "0 42 13 * * *")
public void runUpdateNotaryDistrictsJob() {
LOGGER.info("SCHEDULED run of updateNotaryDistrictsJob STARTED");
Map<String, JobParameter> confMap = new HashMap<>();
confMap.put("time", new JobParameter(System.currentTimeMillis()));
JobParameters jobParameters = new JobParameters(confMap);
try {
jobLauncher.run(updateNotaryDistrictsJob, jobParameters);
}catch (Exception ex){
LOGGER.error(ex.getMessage());
}
}
然后我試圖將此運算式外部化為一個占位符，其值定義到application.properties檔案中。
所以在我的application.properties檔案中我定義了這個：
cron.expresion.runUpdateNotaryDistrictJob='0 32 11 * * *'
然后我就這樣修改了之前的@Scheduled方法注解：
@Scheduled(cron = "${cron.expresion.runUpdateNotaryDistrictJob=}")
public void runUpdateNotaryDistrictsJob() {
LOGGER.info("SCHEDULED run of updateNotaryDistrictsJob STARTED");
Map<String, JobParameter> confMap = new HashMap<>();
confMap.put("time", new JobParameter(System.currentTimeMillis()));
JobParameters jobParameters = new JobParameters(confMap);
try {
jobLauncher.run(updateNotaryDistrictsJob, jobParameters);
}catch (Exception ex){
LOGGER.error(ex.getMessage());
}
}
現在的問題是，在運行這個 Spring Boot 應用程式時，我獲得了以下例外：
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2021-10-26 11:30:43.556 ERROR 6117 --- [ main] o.s.boot.SpringApplication : Application run failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'springBatchExampleJobLauncher' defined in file [/home/andrea/git/notartel-api-batch/target/classes/com/notariato/updateInfo/SpringBatchExampleJobLauncher.class]: Initialization of bean failed; nested exception is java.lang.IllegalStateException: Encountered invalid @Scheduled method 'runUpdateNotaryDistrictsJob': Could not resolve placeholder 'cron.expresion.runUpdateNotaryDistrictJob=' in value "${cron.expresion.runUpdateNotaryDistrictJob=}"
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:610) ~[spring-beans-5.3.9.jar:5.3.9]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524) ~[spring-beans-5.3.9.jar:5.3.9]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.9.jar:5.3.9]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.9.jar:5.3.9]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.9.jar:5.3.9]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.9.jar:5.3.9]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:944) ~[spring-beans-5.3.9.jar:5.3.9]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918) ~[spring-context-5.3.9.jar:5.3.9]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583) ~[spring-context-5.3.9.jar:5.3.9]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145) ~[spring-boot-2.5.3.jar:2.5.3]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754) ~[spring-boot-2.5.3.jar:2.5.3]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:434) ~[spring-boot-2.5.3.jar:2.5.3]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:338) ~[spring-boot-2.5.3.jar:2.5.3]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1343) ~[spring-boot-2.5.3.jar:2.5.3]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1332) ~[spring-boot-2.5.3.jar:2.5.3]
at com.notariato.updateInfo.UpdateInfoBatchApplication.main(UpdateInfoBatchApplication.java:42) ~[classes/:na]
Caused by: java.lang.IllegalStateException: Encountered invalid @Scheduled method 'runUpdateNotaryDistrictsJob': Could not resolve placeholder 'cron.expresion.runUpdateNotaryDistrictJob=' in value "${cron.expresion.runUpdateNotaryDistrictJob=}"
at org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.processScheduled(ScheduledAnnotationBeanPostProcessor.java:511) ~[spring-context-5.3.9.jar:5.3.9]
at org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.lambda$null$1(ScheduledAnnotationBeanPostProcessor.java:374) ~[spring-context-5.3.9.jar:5.3.9]
at java.base/java.lang.Iterable.forEach(Iterable.java:75) ~[na:na]
at org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.lambda$postProcessAfterInitialization$2(ScheduledAnnotationBeanPostProcessor.java:374) ~[spring-context-5.3.9.jar:5.3.9]
at java.base/java.util.LinkedHashMap.forEach(LinkedHashMap.java:684) ~[na:na]
at org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.postProcessAfterInitialization(ScheduledAnnotationBeanPostProcessor.java:373) ~[spring-context-5.3.9.jar:5.3.9]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:437) ~[spring-beans-5.3.9.jar:5.3.9]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1790) ~[spring-beans-5.3.9.jar:5.3.9]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:602) ~[spring-beans-5.3.9.jar:5.3.9]
... 15 common frames omitted
uj5u.com熱心網友回復：
你=的@Schedule注釋中有一個額外的。嘗試以下操作（注意=在 末尾洗掉cron.expresion.runUpdateNotaryDistrictJob）：
@Scheduled(cron = "${cron.expresion.runUpdateNotaryDistrictJob}")
此外，正如@slauth 提到的，您的屬性檔案中有單引號需要洗掉：
cron.expresion.runUpdateNotaryDistrictJob = 0 32 11 * * *
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