zheng-master是一个分布式的开源框架，接触后在编译过程中，有一个错误找了好久，今晚终于找到答案了，原来是文件编码导致。

错误信息如下：

2018-07-23 23:51:29,684 [main] ERROR [org.springframework.web.context.ContextLoader] - Context initialization failed
org.springframework.beans.factory.BeanDefinitionStoreException: Invalid bean definition with name 'shiroFilter' defined in URL [jar:file:/D:/appserver/maven/maven3.5/repo/com/quanxi/mns-upms-client/1.0.0/mns-upms-client-1.0.0.jar!/applicationContext-shiro.xml]: Could not resolve placeholder 'zheng.upms.sso.server.url' in value "${zheng.upms.sso.server.url}"; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'zheng.upms.sso.server.url' in value "${zheng.upms.sso.server.url}"
	at org.springframework.beans.factory.config.PlaceholderConfigurerSupport.doProcessProperties(PlaceholderConfigurerSupport.java:223)
	at org.springframework.context.support.PropertySourcesPlaceholderConfigurer.processProperties(PropertySourcesPlaceholderConfigurer.java:180)
	at org.springframework.context.support.PropertySourcesPlaceholderConfigurer.postProcessBeanFactory(PropertySourcesPlaceholderConfigurer.java:152)
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:281)
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:161)
	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:686)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:524)
	at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:443)
	at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:325)
	at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)
	at org.eclipse.jetty.server.handler.ContextHandler.callContextInitialized(ContextHandler.java:800)
	at org.eclipse.jetty.servlet.ServletContextHandler.callContextInitialized(ServletContextHandler.java:444)
	at org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextHandler.java:791)
	at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:294)
	at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1349)
	at org.eclipse.jetty.maven.plugin.JettyWebAppContext.startWebapp(JettyWebAppContext.java:296)
	at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1342)
	at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:741)
	at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:505)
	at org.eclipse.jetty.maven.plugin.JettyWebAppContext.doStart(JettyWebAppContext.java:365)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
	at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:132)
	at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:114)
	at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:61)
	at org.eclipse.jetty.server.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:163)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
	at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:132)
	at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:114)
	at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:61)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
	at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:132)
	at org.eclipse.jetty.server.Server.start(Server.java:387)
	at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:114)
	at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:61)
	at org.eclipse.jetty.server.Server.doStart(Server.java:354)
	at org.eclipse.jetty.maven.plugin.JettyServer.doStart(JettyServer.java:73)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
	at org.eclipse.jetty.maven.plugin.AbstractJettyMojo.startJetty(AbstractJettyMojo.java:534)
	at org.eclipse.jetty.maven.plugin.AbstractJettyMojo.execute(AbstractJettyMojo.java:357)
	at org.eclipse.jetty.maven.plugin.JettyRunMojo.execute(JettyRunMojo.java:167)
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
	at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)
	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
	at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
	at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
	at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
	at org.codehaus.classworlds.Launcher.main(Launcher.java:47)

从代码逻辑来看，一切都是正常的，但就是一直报这个错误，在IDEA中如果修改了一下这个文件，有时又是正常的。

今晚定位到了可能是配置文件编码的问题后，又尝试了将配置文件全部转UTF-8编码后，测试了几次，发现问题解决了。

因此总结如下：

文件编码如果是GBK或ANSI的，在IDEA编辑器中，有可能识别错误。因此编译之前，要确保各个配置文件编码是正常的，要不然Java容器运行的时候，就可能是一个null值，读取失败后，最终报出来的是与这个配置文件相关的错误，而不是配置文件找不到。