错误信息

使用Redis 时遇到Could not resolve placeholder ‘redis.maxIdle’ in string value "${redis.maxIdle}"错误。可以肯定的是读取配置文件时获取。

严重: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanDefinitionStoreException: Invalid bean definition with name 'poolConfig' defined in URL [jar:file:/D:/repository_huanletao/com/hlt/hlt-common/1.0-SNAPSHOT/hlt-common-1.0-SNAPSHOT.jar!/spring/applicationContext-redis.xml]: Could not resolve placeholder 'redis.maxIdle' in string value "${redis.maxIdle}"; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'redis.maxIdle' in string value "${redis.maxIdle}"at org.springframework.beans.factory.config.PlaceholderConfigurerSupport.doProcessProperties(PlaceholderConfigurerSupport.java:211)at org.springframework.context.support.PropertySourcesPlaceholderConfigurer.processProperties(PropertySourcesPlaceholderConfigurer.java:177)at org.springframework.context.support.PropertySourcesPlaceholderConfigurer.postProcessBeanFactory(PropertySourcesPlaceholderConfigurer.java:152)at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:284)at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:166)at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:678)at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:520)at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:446)at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:328)at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4939)at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5434)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)at java.util.concurrent.FutureTask.run(FutureTask.java:266)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'redis.maxIdle' in string value "${redis.maxIdle}"at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:174)at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:126)at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:204)at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:178)at org.springframework.context.support.PropertySourcesPlaceholderConfigurer$2.resolveStringValue(PropertySourcesPlaceholderConfigurer.java:172)at org.springframework.beans.factory.config.BeanDefinitionVisitor.resolveStringValue(BeanDefinitionVisitor.java:282)at org.springframework.beans.factory.config.BeanDefinitionVisitor.resolveValue(BeanDefinitionVisitor.java:204)at org.springframework.beans.factory.config.BeanDefinitionVisitor.visitPropertyValues(BeanDefinitionVisitor.java:141)at org.springframework.beans.factory.config.BeanDefinitionVisitor.visitBeanDefinition(BeanDefinitionVisitor.java:82)at org.springframework.beans.factory.config.PlaceholderConfigurerSupport.doProcessProperties(PlaceholderConfigurerSupport.java:208)... 18 more九月 07, 2019 9:51:33 上午 org.apache.catalina.core.StandardContext startInternal
严重: Error listenerStart
九月 07, 2019 9:51:33 上午 org.apache.catalina.core.StandardContext startInternal
严重: Context [] startup failed due to previous errors
九月 07, 2019 9:51:33 上午 org.apache.catalina.core.ApplicationContext log
信息: Closing Spring root WebApplicationContext
九月 07, 2019 9:51:34 上午 org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
严重: The web application [] registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
九月 07, 2019 9:51:34 上午 org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
严重: The web application [] registered the JDBC driver [com.mysql.fabric.jdbc.FabricMySQLDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
九月 07, 2019 9:51:34 上午 org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
严重: The web application [] registered the JDBC driver [com.alibaba.druid.proxy.DruidDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
九月 07, 2019 9:51:34 上午 org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
严重: The web application [] registered the JDBC driver [com.alibaba.druid.mock.MockDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
九月 07, 2019 9:51:34 上午 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
严重: The web application [] appears to have started a thread named [Abandoned connection cleanup thread] but has failed to stop it. This is very likely to create a memory leak.
九月 07, 2019 9:51:34 上午 org.apache.coyote.AbstractProtocol start
信息: Starting ProtocolHandler ["http-bio-9002"]

解决方式

原因是在多个子项目中都加载了配置文件，例如DAO加载了数据库相关的配置文件。最开始的加载配置文件代码如下图：

将所有的加载配置文件的代码修改成下面的形式就好了（必须所有的加载方式一样）：

<!-- 加载配置文件 --><context:property-placeholder location="classpath*:properties/*.properties" />

DAO的加载配置文件：

Redis加载配置文件：

错误原因

context:property-placeholder标签提供了一种优雅的外在化参数配置的方式，不过该标签在Spring配置文件中只能存在一份。
Spring容器是采用反射扫描的发现机制，通过标签的命名空间实例化实例，当Spring探测到容器中有一个，org.springframework.beans.factory.config.PropertyPlaceholderCVonfigurer的Bean就会停止对剩余PropertyPlaceholderConfigurer的扫描，即只能存在一个实例。
大概意思是，例如dao加载了db.properties配置文件

<!-- 加载配置文件 --><context:property-placeholder location="classpath:properties/db.properties" />

那么就不会再去加载其他的配置文件，想要加载其他的就需要这样写：

<!-- 加载配置文件 多个文件用，隔开 --><context:property-placeholder location="classpath*:properties/*.properties,xxx.properties" />

但是我们需要的是Redis的配置文件，它并不在当前的DAO的classpath下面，所以需要这样来加载配置文件：

<!-- 加载配置文件 --><context:property-placeholder location="classpath*:properties/*.properties" />

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Redis配置错误（已解决） Could not resolve placeholder 'redis.maxIdle' in string value ${redis.maxIdle}

错误信息

解决方式

错误原因

Redis配置错误（已解决） Could not resolve placeholder 'redis.maxIdle' in string value ${redis.maxIdle}相关推荐

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