java Tomcat 严重：异常启动过滤器 CorsFilter、ClassNotFoundException
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Tomcat SEVERE: Exception starting filter CorsFilter, ClassNotFoundException
提问by JC Carrillo
I'm trying to enable CORS for my java servlet with the following class:
我正在尝试使用以下类为我的 java servlet 启用 CORS：
package com.prosperity.mobile.core;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class CORSFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
public void doFilter(ServletRequest servletRequest,
ServletResponse servletResponse, FilterChain chain)
throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) servletRequest;
// System.out.println("Request: " + request.getMethod());
HttpServletResponse resp = (HttpServletResponse) servletResponse;
resp.addHeader("Access-Control-Allow-Origin", "*");
resp.addHeader("Access-Control-Allow-Methods", "GET,POST");
resp.addHeader("Access-Control-Allow-Headers",
"Origin, X-Requested-With, Content-Type, Accept");
// Just ACCEPT and REPLY OK if OPTIONS
if (request.getMethod().equals("OPTIONS")) {
resp.setStatus(HttpServletResponse.SC_OK);
return;
}
chain.doFilter(request, servletResponse);
}
@Override
public void destroy() {
}
}
My XML:
我的 XML：
<filter>
<filter-name>CorsFilter</filter-name>
<filter-class>com.prosperity.mobile.core.CORSFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>CorsFilter</filter-name>
<url-pattern>*</url-pattern>
</filter-mapping>
And when I try and deploy the war to the tomcat instance:
当我尝试将War部署到 tomcat 实例时：
SEVERE: Exception starting filter CorsFilter
java.lang.ClassNotFoundException: com.prosperity.mobile.core.CORSFilter
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1718)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1569)
at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:529)
at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:511)
at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:139)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:258)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:105)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4809)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5485)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:632)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1073)
at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1857)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Sep 21, 2015 11:49:35 AM org.apache.catalina.core.StandardContext startInternal
SEVERE: Error filterStart
Sep 21, 2015 11:49:35 AM org.apache.catalina.core.StandardContext startInternal
SEVERE: Context [/ProsperityMobile] startup failed due to previous errors
Which seems like a pretty obvious error, it's complaining that it's not finding the CORSFilter class.. but it's there, in the correct package and everything?!
这似乎是一个非常明显的错误，它抱怨它没有找到 CORSFilter 类......但它在那里，在正确的包和所有东西中？！
As a note: My tomcat instance is located at: C:\apache-tomcat-7.0.52
注意：我的 tomcat 实例位于：C:\apache-tomcat-7.0.52
回答by JC Carrillo
unzip the war file and triple check the class file is there.
解压缩 war 文件并三重检查类文件是否在那里。
