今天在搞工作流，tomcat7.0.57 总是报错，解析不了web.xml引用的joa.xml .
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app
[<!ENTITY joa SYSTEM "joa.xml">]>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0">
后经查找资料发现：
tomcat 7.0.52开始的版本才会出这个问题，
是因为安全的考虑tomcat 7.0.52开始的版本把xmlBlockExterna属性默认为false，要解决这个问题，
两种方法：
1、把tomcat版本换成7.0.52之前的版本。
2、把xmlBlockExterna设成false。
下面是原版解释：
As per discussion with Tomcat developers, xmlBlockExternal="false" attribute of Tomcat‘s Context (context.xml) was set true by default starting from 7.0.52. With xmlBlockExternal="false"generated/djn-settings.conf can be included。
<Context xmlBlockExternal="false" >
<!-- Default set of monitored resources -->
<WatchedResource>WEB-INF/web.xml</WatchedResource>
<!-- Uncomment this to disable session persistence across Tomcat restarts -->
<!--
<Manager pathname="" />
-->
<!-- Uncomment this to enable Comet connection tacking (provides events
on session expiration as well as webapp lifecycle) -->
<!--
<Valve className="org.apache.catalina.valves.CometConnectionManagerValve" />
-->
</Context>
解决完这个问题后，又出现了一个新问题：
Tomcat7启动报错:
Caused by: java.lang.NoClassDefFoundError:
Lorg/apache/AnnotationProcessor;
之后查找资料解决方法：
在项目下创建org.apache：
package org.apache;
import java.lang.reflect.InvocationTargetException;
import javax.naming.NamingException;
/**
* @author 董志博
* @date 2015-8-17
* @description
* @Version 1.0
*/
public interface AnnotationProcessor {
public void postConstruct(Object instance) throws IllegalAccessException,
InvocationTargetException;
public void preDestroy(Object instance) throws IllegalAccessException,
InvocationTargetException;
public void processAnnotations(Object instance)
throws IllegalAccessException, InvocationTargetException,
NamingException;
}
由于时间问题，还未了解原因。待续.......
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