The configured protocol [org.apache.coyote.http11.Http11AprProtocol] requires the APR/native library which is not available-Collection of common programming errors

![enter image description here][1] Everybody! Today,I encounter a problem when I start my tomcat7.0 for developing web project(user.war).

1. cd apache-tomcat-7.0.47/webapps
2. cp my project(user.war) .
3. cd ../conf
4. vi server.xml(modify sth for configuring my project)
5. cd ../bin

6. ./startup.sh

   Then comes the wrong information. Any help is appreciated.

The wrong information:

??: Failed to initialize connector [Connector[HTTP/1.1-8083]] org.apache.catalina.LifecycleException: Failed to initialize component [Connector[HTTP/1.1-8083]] at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:106) at org.apache.catalina.core.StandardService.initInternal(StandardService.java:559) at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:102) at org.apache.catalina.core.StandardServer.initInternal(StandardServer.java:814) at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:102) at org.apache.catalina.startup.Catalina.load(Catalina.java:640) at org.apache.catalina.startup.Catalina.load(Catalina.java:665) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:616) at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:281) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:455) Caused by: org.apache.catalina.LifecycleException: The configured protocol [org.apache.coyote.http11.Http11AprProtocol] requires the APR/native library which is not available at org.apache.catalina.connector.Connector.initInternal(Connector.java:975) at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:102) … 12 more 2014-2-20 16:56:56 org.apache.catalina.startup.Catalina load