我正在我的 Tomcat 7 服务器上运行一个应用程序。服务器加载并运行，但是当我进入时http://localhost:8080/ApplicationTest出现以下错误：
HTTP Status 404 - /ApplicationTest
type Status report
message /ApplicationTest
description The requested resource is not available.
Apache Tomcat/7.0.42
我已在我的属性和服务器位置下的 Tomcat Server 7 设置中切换位置，我已将其更改为“使用 Tomcat 安装”。但它仍然无法正常工作，我什至尝试重新安装服务器。我正在使用 Eclipse Kepler 和 Tomcat 7，并运行 vaadin Web 应用程序。我的 tomcat 日志中没有任何错误，如下所示：
Sep 06, 2013 3:32:27 PM org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jre7\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Program Files\Common Files\Microsoft Shared\Windows Live;C:\Program Files (x86)\Common Files\Microsoft Shared\Windows Live;C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files\Intel\iCLS Client\;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\Program Files\ThinkPad\Bluetooth Software\;C:\Program Files\ThinkPad\Bluetooth Software\syswow64;;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\OpenCL SDK\2.0\bin\x86;C:\Program Files (x86)\Intel\OpenCL SDK\2.0\bin\x64;C:\Program Files\Common Files\Lenovo;C:\Program Files (x86)\Windows Live\Shared;C:\SWTOOLS\ReadyApps;C:\Program Files (x86)\Symantec\VIP Access Client\;C:\Program Files (x86)\Common Files\Lenovo;C:\Program Files (x86)\Java\jre7\bin;C:\Program Files\Java\jre7\bin;C:\MinGW\bin;C:\Program Files (x86)\Gow\bin;C:\Program Files (x86)\WinSCP\;C:\Program Files (x86)\Notepad++\;.
Sep 06, 2013 3:32:27 PM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:TweetApp' did not find a matching property.
Sep 06, 2013 3:32:27 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8080"]
Sep 06, 2013 3:32:27 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
Sep 06, 2013 3:32:27 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 722 ms
Sep 06, 2013 3:32:27 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Sep 06, 2013 3:32:27 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.42
Sep 06, 2013 3:32:29 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory C:\Users\wa7sh\Programs\apache-tomcat-7.0.42\webapps\docs
Sep 06, 2013 3:32:29 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory C:\Users\wa7sh\Programs\apache-tomcat-7.0.42\webapps\examples
Sep 06, 2013 3:32:29 PM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: contextInitialized()
Sep 06, 2013 3:32:29 PM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: contextInitialized()
Sep 06, 2013 3:32:29 PM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: attributeAdded('org.apache.jasper.compiler.TldLocationsCache', 'org.apache.jasper.compiler.TldLocationsCache@2e901f36')
Sep 06, 2013 3:32:29 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory C:\Users\wa7sh\Programs\apache-tomcat-7.0.42\webapps\host-manager
Sep 06, 2013 3:32:29 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory C:\Users\wa7sh\Programs\apache-tomcat-7.0.42\webapps\manager
Sep 06, 2013 3:32:29 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory C:\Users\wa7sh\Programs\apache-tomcat-7.0.42\webapps\ROOT
Sep 06, 2013 3:32:29 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8080"]
Sep 06, 2013 3:32:29 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
Sep 06, 2013 3:32:29 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 1788 ms
所以我的问题是如何解决这个问题，如何在我的 tomcat 7 服务器上运行我的应用程序？如果有帮助，下面是我的 server.xml：
<?xml version="1.0" encoding="UTF-8"?>
<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
--><!-- Note: A "Server" is not itself a "Container", so you may not
define subcomponents such as "Valves" at this level.
Documentation at /docs/config/server.html
--><Server port="8005" shutdown="SHUTDOWN">
<!-- Security listener. Documentation at /docs/config/listeners.html
<Listener className="org.apache.catalina.security.SecurityListener" />
-->
<!--APR library loader. Documentation at /docs/apr.html -->
<Listener SSLEngine="on" className="org.apache.catalina.core.AprLifecycleListener"/>
<!--Initialize Jasper prior to webapps are loaded. Documentation at /docs/jasper-howto.html -->
<Listener className="org.apache.catalina.core.JasperListener"/>
<!-- Prevent memory leaks due to use of particular java/javax APIs-->
<Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener"/>
<Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener"/>
<Listener className="org.apache.catalina.core.ThreadLocalLeakPreventionListener"/>
<!-- Global JNDI resources
Documentation at /docs/jndi-resources-howto.html
-->
<GlobalNamingResources>
<!-- Editable user database that can also be used by
UserDatabaseRealm to authenticate users
-->
<Resource auth="Container" description="User database that can be updated and saved" factory="org.apache.catalina.users.MemoryUserDatabaseFactory" name="UserDatabase" pathname="conf/tomcat-users.xml" type="org.apache.catalina.UserDatabase"/>
</GlobalNamingResources>
<!-- A "Service" is a collection of one or more "Connectors" that share
a single "Container" Note: A "Service" is not itself a "Container",
so you may not define subcomponents such as "Valves" at this level.
Documentation at /docs/config/service.html
-->
<Service name="Catalina">
<!--The connectors can use a shared executor, you can define one or more named thread pools-->
<!--
<Executor name="tomcatThreadPool" namePrefix="catalina-exec-"
maxThreads="150" minSpareThreads="4"/>
-->
<!-- A "Connector" represents an endpoint by which requests are received
and responses are returned. Documentation at :
Java HTTP Connector: /docs/config/http.html (blocking & non-blocking)
Java AJP Connector: /docs/config/ajp.html
APR (HTTP/AJP) Connector: /docs/apr.html
Define a non-SSL HTTP/1.1 Connector on port 8080
-->
<Connector connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443"/>
<!-- A "Connector" using the shared thread pool-->
<!--
<Connector executor="tomcatThreadPool"
port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" />
-->
<!-- Define a SSL HTTP/1.1 Connector on port 8443
This connector uses the JSSE configuration, when using APR, the
connector should be using the OpenSSL style configuration
described in the APR documentation -->
<!--
<Connector port="8443" protocol="HTTP/1.1" SSLEnabled="true"
maxThreads="150" scheme="https" secure="true"
clientAuth="false" sslProtocol="TLS" />
-->
<!-- Define an AJP 1.3 Connector on port 8009 -->
<Connector port="8009" protocol="AJP/1.3" redirectPort="8443"/>
<!-- An Engine represents the entry point (within Catalina) that processes
every request. The Engine implementation for Tomcat stand alone
analyzes the HTTP headers included with the request, and passes them
on to the appropriate Host (virtual host).
Documentation at /docs/config/engine.html -->
<!-- You should set jvmRoute to support load-balancing via AJP ie :
<Engine name="Catalina" defaultHost="localhost" jvmRoute="jvm1">
-->
<Engine defaultHost="localhost" name="Catalina">
<!--For clustering, please take a look at documentation at:
/docs/cluster-howto.html (simple how to)
/docs/config/cluster.html (reference documentation) -->
<!--
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>
-->
<!-- Use the LockOutRealm to prevent attempts to guess user passwords
via a brute-force attack -->
<Realm className="org.apache.catalina.realm.LockOutRealm">
<!-- This Realm uses the UserDatabase configured in the global JNDI
resources under the key "UserDatabase". Any edits
that are performed against this UserDatabase are immediately
available for use by the Realm. -->
<Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="UserDatabase"/>
</Realm>
<Host appBase="webapps" autoDeploy="true" name="localhost" unpackWARs="true">
<!-- SingleSignOn valve, share authentication between web applications
Documentation at: /docs/config/valve.html -->
<!--
<Valve className="org.apache.catalina.authenticator.SingleSignOn" />
-->
<!-- Access log processes all example.
Documentation at: /docs/config/valve.html
Note: The pattern used is equivalent to using pattern="common" -->
<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs" pattern="%h %l %u %t "%r" %s %b" prefix="localhost_access_log." suffix=".txt"/>
<Context docBase="TweetApp" path="/TweetApp" reloadable="true" source="org.eclipse.jst.jee.server:TweetApp"/></Host>
</Engine>
</Service>
</Server>
下面是我的 web.xml 中的 servlet 映射
<!-- ================ Built In Servlet Mappings
========================= -->
<!-- The servlet mappings for the built in servlets defined above. Note --> <!-- that, by default, the CGI and SSI servlets are *not* mapped. You --> <!-- must uncomment these mappings (or add them to your application's own --> <!-- web.xml deployment descriptor) to enable these services -->
<!-- The mapping for the default servlet -->
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- The mappings for the JSP servlet -->
<servlet-mapping>
<servlet-name>jsp</servlet-name>
<url-pattern>*.jsp</url-pattern>
<url-pattern>*.jspx</url-pattern>
</servlet-mapping>
<!-- The mapping for the SSI servlet --> <!--
<servlet-mapping>
<servlet-name>ssi</servlet-name>
<url-pattern>*.shtml</url-pattern>
</servlet-mapping>
-->
<!-- The mapping for the CGI Gateway servlet -->
<!--
<servlet-mapping>
<servlet-name>cgi</servlet-name>
<url-pattern>/cgi-bin/*</url-pattern>
</servlet-mapping>
-->