Servlet过滤器不适用于AppEngine手动缩放 [英] Servlet filters not working with AppEngine manual scaling

问题描述

我正在使用Google AppEngine和java。
我通过在appengine-web.xml中添加以下内容来配置手动缩放：

 < manual-scaling> 
<实例> 1< / instances> 
< / manual-scaling> 
  

但是在我添加这个之后，我无法在web中使用带有以下映射的servlet过滤器。 xml。

 < filter> 
< filter-name> testFilter< / filter-name> 
< filter-class> com.fms.test.TestFilter< / filter-class> 
< / filter> 
< filter-mapping> 
< filter-name> testFilter< / filter-name> 
< url-pattern> / _ ah / api / *< / url-pattern> 
< url-pattern> / _ ah / spi / *< / url-pattern> 
< / filter-mapping> 
  

如果我将*作为url-pattern，过滤器将工作，但这不是我的要求。如果没有手动缩放，它就会按预期工作。

有人可以告诉我为什么我不能使用它吗？

PS：我在开发环境中使用AppEngine SDK 1.9.42版本

以下是我的过滤器代码：

  public class TestFilter implements Filter {
 private static final AdvocacyUtils utils = AdvocacyUtils.getInstance（）; 
 $ b $ public void doFilter（ServletRequest request，ServletResponse response，FilterChain chain）throws IOException，ServletException {
 System.out.println（Request filtered。）; 
 
 $ b @Override 
 public void destroy（）{
} 
 $ b $ @Override 
 public void init（FilterConfig filterConfig ）throws ServletException {
} 
} 
  

解决方案

我找到了一些解决方法（ here ）
解决方法是

 < filter-mapping>添加到过滤器映射aditional部分 - 调度程序 
< filter-name> ObjectifyFilter< / filter-name> 
< url-pattern> / *< / url-pattern> 
< dispatcher> REQUEST< / dispatcher> 
< dispatcher> INCLUDE< / dispatcher> 
< dispatcher> FORWARD< / dispatcher> 
< / filter-mapping> 
  

I am using Google AppEngine with java. I have configured for manual scaling by adding the following in appengine-web.xml

<manual-scaling>
    <instances>1</instances>
</manual-scaling>

But after I add this, I am not able to use servlet filters with the following mapping in web.xml.

<filter>
    <filter-name>testFilter</filter-name>
    <filter-class>com.fms.test.TestFilter</filter-class> 
</filter>
<filter-mapping>
    <filter-name>testFilter</filter-name>
    <url-pattern>/_ah/api/*</url-pattern>  
    <url-pattern>/_ah/spi/*</url-pattern>  
</filter-mapping>

The filters will work if I give * as url-pattern, but that is not my requirement. Without the manual scaling, it is working as expected.

Can anybody tell me why I cant use it?

PS: I am in development environment and using AppEngine SDK version 1.9.42

Here is my filter code:

public class TestFilter implements Filter { 
    private static final AdvocacyUtils utils = AdvocacyUtils.getInstance();

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        System.out.println("Request filtered.");
    }

    @Override
    public void destroy() {
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException { 
    }
}

解决方案

I've found some workaround (here) Solution is to add into the "filter-mapping" aditional section - "dispatcher" like in this snippet:

<filter-mapping>
    <filter-name>ObjectifyFilter</filter-name>
    <url-pattern>/*</url-pattern>
    <dispatcher>REQUEST</dispatcher>
    <dispatcher>INCLUDE</dispatcher>
    <dispatcher>FORWARD</dispatcher>
</filter-mapping>

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