如何在Java servlet Web应用程序中抓取未捕获的异常 [英] How to grab uncaught exceptions in a Java servlet web application

问题描述

有没有一种标准的方法可以捕获像tomcat或Jetty这样的java servlet容器中发生的未捕获的异常？我们运行了很多来自图书馆的servlet，所以我们不能轻易地把我们的try / catch代码。在我们的Web应用程序（运行在Jetty）中的所有未捕获的异常都可以通过提供的API捕获并记录到我们的错误跟踪器中。通常的方式可以通过API提供的方式捕获并记录所有未捕获的异常。

请不需要仅记录例外情况，重定向是否发生到自定义错误页面不会帮助我。我们通过GWT-RPC做所有事情，所以用户永远不会看到错误页面。

解决方案

我认为自定义过滤器实际上最有效

  @Override 
 public void doFilter（ServletRequest请求，ServletResponse响应，FilterChain链）throws IOException，ServletException {
 try {
 chain.doFilter（request，response）; 
} catch（Throwable e）{
 doCustomErrorLogging（e）; 
 if（e instanceof IOException）{
 throw（IOException）e; 
} else if（e instanceof ServletException）{
 throw（ServletException）e; 
} else if（e instanceof RuntimeException）{
 throw（RuntimeException）e; 
} else {
 //这不应该被击中
抛出新的RuntimeException（意外异常，e）; 
} 
} 
} 
  

Is there a standard way to catch uncaught exceptions that happen inside of a java servlet container like tomcat or Jetty? We run a lot of servlets that come from libraries so we cannot easily put our on try/catch code. It would also be nice to in as generic of a way as possible catch and log all uncaught exceptions in our web application (which runs in Jetty) to our bug tracker via the API provided.

Please not I need to log the exceptions only, whether a a redirect is issues to a custom error page will not help me. We do everything via GWT-RPC so the user would never see an error page.

解决方案

I think a custom filter actually works best.

@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
    try {
        chain.doFilter(request, response);
    } catch (Throwable e) {
        doCustomErrorLogging(e);
        if (e instanceof IOException) {
            throw (IOException) e;
        } else if (e instanceof ServletException) {
            throw (ServletException) e;
        } else if (e instanceof RuntimeException) {
            throw (RuntimeException) e;
        } else {
            //This should never be hit
            throw new RuntimeException("Unexpected Exception", e);
        }
    }
}

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