最近在學習黃勇的《架構探險-從零開始寫Java Web框架》，按照書上寫了個smart-framework框架。在yoga專案測驗該框架的時候，啟動tomcat報例外。
java.lang.ClassNotFoundException: org.smart4j.smart_framework.DispatcherServlet
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1269)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1104)
at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:508)
at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:489)
at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:119)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1041)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:980)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4819)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5129)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1425)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1415)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:941)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:839)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1425)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1415)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:941)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:258)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:422)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:770)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.startup.Catalina.start(Catalina.java:657)
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:483)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:355)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:495)
九月 24, 2017 10:54:50 上午 org.apache.coyote.AbstractProtocol start
資訊: Starting ProtocolHandler ["http-nio-8080"]
九月 24, 2017 10:54:50 上午 org.apache.coyote.AbstractProtocol start
資訊: Starting ProtocolHandler ["ajp-nio-8009"]
九月 24, 2017 10:54:50 上午 org.apache.catalina.startup.Catalina start
資訊: Server startup in 880 ms
我在web.xml中配置了該servlet org.smart4j.smart_framework.DispatcherServlet，點擊該鏈接也能找到DispatcherServlet類。下邊是web.xml配置
<web-app>
<display-name>Archetype Created Web Application</display-name>
<servlet>
<servlet-name>dispatcherServlet</servlet-name>
<servlet-class>org.smart4j.smart_framework.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
</web-app>
下面是專案chapter3結構，里邊有 org.smart4j.smart_framework.DispatcherServlet類
uj5u.com熱心網友回復：
可能tomcat編譯專案中沒有jar包，你可以打開tomcat檔案夾中專案檔案，看看有沒jar包uj5u.com熱心網友回復：
可能是沒有相應的jar包uj5u.com熱心網友回復：
我遇到過超級坑，<value>******</value>因為這個換行了決議找不到，最終<value>******</value> 把換行去掉就運行成功了
uj5u.com熱心網友回復：
看看是jar的版本問題不uj5u.com熱心網友回復：
tomcat的依賴包必須放在 web-inf /lib 的檔案夾下，然而編譯環境并不會把依賴包放在該檔案夾下，所以需要手動拷貝。不然tomcat無法找到該類包。
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標籤：Web 開發