[DUBBO] No such extension com.alibaba.dubbo.container.Container by name spring , possible causes:

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本文详细解析了Dubbo启动失败的错误现象，指出配置错误是导致问题的主要原因。通过分析日志，发现“dubbo.container=spring”配置项存在空格，导致Spring容器无法正确加载。文章还提供了排查思路和解决方法，对于遇到类似问题的开发者具有较高的参考价值。

问题现象：dubbo启动失败

[2019-12-23 14:48:53 ERROR] [main] (com.alibaba.dubbo.container.Main:86) - [DUBBO] No such extension com.alibaba.dubbo.container.Container by name spring , possible causes:
(1) com.alibaba.dubbo.container.logback.LogbackContainer:
java.lang.IllegalStateException: Failed to load extension class(interface: interface com.alibaba.dubbo.container.Container, class line: com.alibaba.dubbo.container.logback.LogbackContainer) in jar:file:/opt/services/ifc-captcha-dubbo-service/lib/dubbo-2.5.3.jar!/META-INF/dubbo/internal/com.alibaba.dubbo.container.Container, cause: ch/qos/logback/core/Context
java.lang.IllegalStateException: Failed to load extension class(interface: interface com.alibaba.dubbo.container.Container, class line: com.alibaba.dubbo.container.logback.LogbackContainer) in jar:file:/opt/services/ifc-captcha-dubbo-service/lib/dubbo-2.5.3.jar!/META-INF/dubbo/internal/com.alibaba.dubbo.container.Container, cause: ch/qos/logback/core/Context
at com.alibaba.dubbo.common.extension.ExtensionLoader.loadFile(ExtensionLoader.java:685)
at com.alibaba.dubbo.common.extension.ExtensionLoader.loadExtensionClasses(ExtensionLoader.java:591)
at com.alibaba.dubbo.common.extension.ExtensionLoader.getExtensionClasses(ExtensionLoader.java:567)
at com.alibaba.dubbo.common.extension.ExtensionLoader.getDefaultExtensionName(ExtensionLoader.java:358)
at com.alibaba.dubbo.container.Main.main(Main.java:50)
Caused by: java.lang.NoClassDefFoundError: ch/qos/logback/core/Context
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:278)
at com.alibaba.dubbo.common.extension.ExtensionLoader.loadFile(ExtensionLoader.java:627)
... 4 more
Caused by: java.lang.ClassNotFoundException: ch.qos.logback.core.Context
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
... 7 more

(2) com.alibaba.dubbo.container.jetty.JettyContainer:
java.lang.IllegalStateException: Failed to load extension class(interface: interface com.alibaba.dubbo.container.Container, class line: com.alibaba.dubbo.container.jetty.JettyContainer) in jar:file:/opt/services/ifc-captcha-dubbo-service/lib/dubbo-2.5.3.jar!/META-INF/dubbo/internal/com.alibaba.dubbo.container.Container, cause: org/mortbay/jetty/Connector
java.lang.IllegalStateException: Failed to load extension class(interface: interface com.alibaba.dubbo.container.Container, class line: com.alibaba.dubbo.container.jetty.JettyContainer) in jar:file:/opt/services/ifc-captcha-dubbo-service/lib/dubbo-2.5.3.jar!/META-INF/dubbo/internal/com.alibaba.dubbo.container.Container, cause: org/mortbay/jetty/Connector
at com.alibaba.dubbo.common.extension.ExtensionLoader.loadFile(ExtensionLoader.java:685)
at com.alibaba.dubbo.common.extension.ExtensionLoader.loadExtensionClasses(ExtensionLoader.java:591)
at com.alibaba.dubbo.common.extension.ExtensionLoader.getExtensionClasses(ExtensionLoader.java:567)
at com.alibaba.dubbo.common.extension.ExtensionLoader.getDefaultExtensionName(ExtensionLoader.java:358)
at com.alibaba.dubbo.container.Main.main(Main.java:50)
Caused by: java.lang.NoClassDefFoundError: org/mortbay/jetty/Connector
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:278)
at com.alibaba.dubbo.common.extension.ExtensionLoader.loadFile(ExtensionLoader.java:627)
... 4 more
Caused by: java.lang.ClassNotFoundException: org.mortbay.jetty.Connector
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
... 7 more
, dubbo version: 2.5.3, current host: 127.0.0.1