環境：
- Java1.8
- Nacos1.2.1
- Spring Cloud Hoxton.SR3
- Spring Cloud Alibaba 2.2.1.RELEASE
項目正在運行，使用Nacos發佈配置 項目報錯：
2020-05-29 16:39:59.925 ERROR 2072 --- [171.28_8848-dev] c.a.nacos.client.config.impl.CacheData : [fixed-47.101.171.28_8848-dev] [notify-error] dataId=author-server-dev.properties, group=HZQX_SERVER, md5=d6bc9332211dda0de19145f73ba604b0, listener=com.alibaba.cloud.nacos.refresh.NacosContextRefresher$1@215629cc tx={}
java.lang.IllegalArgumentException: Could not resolve placeholder 'project.version' in value "${project.version}"
at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:178) ~[spring-core-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:124) ~[spring-core-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:236) ~[spring-core-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:210) ~[spring-core-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.core.env.AbstractEnvironment.resolveRequiredPlaceholders(AbstractEnvironment.java:571) ~[spring-core-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at java.util.Optional.map(Optional.java:215) ~[na:1.8.0_241]
at com.ulisesbocchio.jasyptspringboot.resolver.DefaultPropertyResolver.resolvePropertyValue(DefaultPropertyResolver.java:38) ~[jasypt-spring-boot-2.1.2.jar:na]
at com.ulisesbocchio.jasyptspringboot.resolver.DefaultLazyPropertyResolver.resolvePropertyValue(DefaultLazyPropertyResolver.java:42) ~[jasypt-spring-boot-2.1.2.jar:na]
at com.ulisesbocchio.jasyptspringboot.EncryptablePropertySource.getProperty(EncryptablePropertySource.java:20) ~[jasypt-spring-boot-2.1.2.jar:na]
at com.ulisesbocchio.jasyptspringboot.caching.CachingDelegateEncryptablePropertySource.lambda$getProperty$0(CachingDelegateEncryptablePropertySource.java:34) ~[jasypt-spring-boot-2.1.2.jar:na]
at org.springframework.cache.concurrent.ConcurrentMapCache.lambda$get$0(ConcurrentMapCache.java:146) ~[spring-context-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1688) ~[na:1.8.0_241]
at org.springframework.cache.concurrent.ConcurrentMapCache.get(ConcurrentMapCache.java:144) ~[spring-context-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at com.ulisesbocchio.jasyptspringboot.caching.CachingDelegateEncryptablePropertySource.getProperty(CachingDelegateEncryptablePropertySource.java:34) ~[jasypt-spring-boot-2.1.2.jar:na]
at com.ulisesbocchio.jasyptspringboot.wrapper.EncryptableMapPropertySourceWrapper.getProperty(EncryptableMapPropertySourceWrapper.java:31) ~[jasypt-spring-boot-2.1.2.jar:na]
at org.springframework.cloud.context.refresh.ContextRefresher.extract(ContextRefresher.java:253) ~[spring-cloud-context-2.2.2.RELEASE.jar:2.2.2.RELEASE]
at org.springframework.cloud.context.refresh.ContextRefresher.extract(ContextRefresher.java:229) ~[spring-cloud-context-2.2.2.RELEASE.jar:2.2.2.RELEASE]
at org.springframework.cloud.context.refresh.ContextRefresher.refreshEnvironment(ContextRefresher.java:91) ~[spring-cloud-context-2.2.2.RELEASE.jar:2.2.2.RELEASE]
at org.springframework.cloud.context.refresh.ContextRefresher.refresh(ContextRefresher.java:85) ~[spring-cloud-context-2.2.2.RELEASE.jar:2.2.2.RELEASE]
at org.springframework.cloud.endpoint.event.RefreshEventListener.handle(RefreshEventListener.java:72) ~[spring-cloud-context-2.2.2.RELEASE.jar:2.2.2.RELEASE]
at org.springframework.cloud.endpoint.event.RefreshEventListener.onApplicationEvent(RefreshEventListener.java:61) ~[spring-cloud-context-2.2.2.RELEASE.jar:2.2.2.RELEASE]
at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) ~[spring-context-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) ~[spring-context-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) ~[spring-context-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:403) ~[spring-context-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:360) ~[spring-context-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at com.alibaba.cloud.nacos.refresh.NacosContextRefresher$1.innerReceive(NacosContextRefresher.java:133) ~[spring-cloud-starter-alibaba-nacos-config-2.2.1.RELEASE.jar:2.2.1.RELEASE]
at com.alibaba.nacos.api.config.listener.AbstractSharedListener.receiveConfigInfo(AbstractSharedListener.java:38) ~[nacos-api-1.2.1.jar:na]
at com.alibaba.nacos.client.config.impl.CacheData$1.run(CacheData.java:203) ~[nacos-client-1.2.1.jar:na]
at com.alibaba.nacos.client.config.impl.CacheData.safeNotifyListener(CacheData.java:233) [nacos-client-1.2.1.jar:na]
at com.alibaba.nacos.client.config.impl.CacheData.checkListenerMd5(CacheData.java:174) [nacos-client-1.2.1.jar:na]
at com.alibaba.nacos.client.config.impl.ClientWorker$LongPollingRunnable.run(ClientWorker.java:552) [nacos-client-1.2.1.jar:na]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_241]
at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266) [na:1.8.0_241]
at java.util.concurrent.FutureTask.run(FutureTask.java) [na:1.8.0_241]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_241]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [na:1.8.0_241]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_241]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_241]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_241]
原因：未知
解決辦法：在bootstrap.properties裏增加配置：[email protected]@