1 問題出現
當我試著去https://github.com/Red5/red5-server下載Red5的源碼，我是把自己編譯源碼的，
最終的Red5-server需要依賴其他幾個組件：
(1) red5-service
(2) red5-server-common
(3) red5-io
一次編譯完上面三個項目之后,開始輸入命令編譯red5-server，因為這個才是我們最終想要的流媒體服務器.

mvn -Dmaven.test.skip=true install

當讓有上面這一步還不夠:上面只是完成了編譯工作.我們還需要把red5運行的文件大成壓縮包。

mvn -Dmaven.test.skip=true clean package -P assemble

這樣完成之后，你將會再red5-server的target目錄看到如下內容：

2 我首先會把red5-server-1.0.6-SNAPSHOT-server.zip復制到我常用的工作目錄中去.然后解壓該壓縮包。解壓之后看起來應該是這樣:

3 然后一起準備妥當,雙擊red5.bat ，會彈出一個新的黑色窗口.然后程序開始啟動.但是當我啟動過程中,意外的事情發生了.red5沒有像我想象的那么順利.卻拋出如下異常信息:

2015-09-08 13:41:12,813 [Launcher:/oflaDemo] WARN o.s.w.c.s.XmlWebApplicationContext - Exception encountered during context initialization - cancelling refresh attempt org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'web.scope' defined in ServletContext resource [/WEB-INF/red5-web.xml]: Invocation of init method failed; nested exception is java.lang.NoSuchMethodError: org.red5.server.scope.Scope$ConcurrentScopeSet.keySet()Ljava/util/concurrent/ConcurrentHashMap$KeySetView;at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1574) ~[spring-beans-4.1.7.RELEASE.jar:4.1.7.RELEASE]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539) ~[spring-beans-4.1.7.RELEASE.jar:4.1.7.RELEASE]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476) ~[spring-beans-4.1.7.RELEASE.jar:4.1.7.RELEASE]at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303) ~[spring-beans-4.1.7.RELEASE.jar:4.1.7.RELEASE]at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.1.7.RELEASE.jar:4.1.7.RELEASE]at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299) ~[spring-beans-4.1.7.RELEASE.jar:4.1.7.RELEASE]at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) ~[spring-beans-4.1.7.RELEASE.jar:4.1.7.RELEASE]at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:755) ~[spring-beans-4.1.7.RELEASE.jar:4.1.7.RELEASE]at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757) ~[spring-context-4.1.7.RELEASE.jar:4.1.7.RELEASE]at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480) ~[spring-context-4.1.7.RELEASE.jar:4.1.7.RELEASE]at org.red5.server.tomcat.TomcatLoader$1.run(TomcatLoader.java:485) [tomcatplugin-1.9.jar:na] Caused by: java.lang.NoSuchMethodError: org.red5.server.scope.Scope$ConcurrentScopeSet.keySet()Ljava/util/concurrent/ConcurrentHashMap$KeySetView;at org.red5.server.scope.Scope$ConcurrentScopeSet.hasName(Scope.java:1411) ~[red5-server-common-1.0.6-SNAPSHOT.jar:na]at org.red5.server.scope.Scope.hasChildScope(Scope.java:819) ~[red5-server-common-1.0.6-SNAPSHOT.jar:na]at org.red5.server.scope.Scope.init(Scope.java:872) ~[red5-server-common-1.0.6-SNAPSHOT.jar:na]at org.red5.server.scope.WebScope.register(WebScope.java:225) ~[red5-server.jar:na]at org.red5.server.scope.WebScope.afterPropertiesSet(WebScope.java:111) ~[red5-server.jar:na]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1633) ~[spring-beans-4.1.7.RELEASE.jar:4.1.7.RELEASE]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1570) ~[spring-beans-4.1.7.RELEASE.jar:4.1.7.RELEASE]... 10 common frames omitted

4 問題解決方法
導致問題代碼:
Caused by: java.lang.NoSuchMethodError: org.red5.server.scope.ScopeConcurrentScopeSet.keySet()Ljava/util/concurrent/ConcurrentHashMapKeySetView;
經過查閱資料最后發現是java版本的事，我的環境一直用的jdk7 原來keySet不適合java8以下版本，解決方法：將java版本跳到java8版本，或者直接重新安裝一個java8的jdk .

總結

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