2015-06-25 23:11 GMT+03:00 Leo Donahue <donahu...@gmail.com>:
> public void doFilter(ServletRequest request, ServletResponse response,
> FilterChain chain) throws IOException, ServletException
>
> Assuming you have only a single Filter configured in web.xml
>
> Assuming you have logic in a doFilter that checks the value of a boolean.
> If the boolean is true, then assume you send a http status code back and
> use a "return" in the if condition.
>
> example:
>
> if (someConditionIsTrue)
> {
> HttpServletResponse httpResponse = (HttpServletResponse)
> response;
> httpResponse.sendError(HttpServletResponse.WHATEVER_YOU_CHOOSE);
> return;
> }
>
> chain.doFilter(request, response);
>
>
> My question is:
>
> If the chain is placed inside an else, which would not run if the condition
> is true, does that violate the Filter in any way? In other words, if one
> does not call chain.doFilter within a doFilter method, should one expect
> something bad?
>
> What I'm really saying without saying it is, whether I call chain.doFilter
> in or out of an "else", on Tomcat I get the sendError status that I expect,
> but not from other containers. I realize that statement is moot on this
> list, but I thought I would share it.
>
> Are there any conditions in which Tomcat will decide what to do on its own,
> related to sendError, when it can't figure it out from code?
>
> Leo
>
>
> Using CATALINA_BASE: "C:\apache-tomcat\apache-tomcat-7.0.62"
> Using CATALINA_HOME: "C:\apache-tomcat\apache-tomcat-7.0.62"
> Using CATALINA_TMPDIR: "C:\apache-tomcat\apache-tomcat-7.0.62\temp"
> Using JRE_HOME: "C:\Program Files (x86)\Java\jdk1.7.0_67"
> Using CLASSPATH:
> "C:\apache-tomcat\apache-tomcat-7.0.62\bin\bootstrap.jar;C:\apache-tomcat\apache-tomcat-7.0.62\bin\tomcat-juli.jar"
> Server version: Apache Tomcat/7.0.62
> Server built: May 7 2015 17:14:55 UTC
> Server number: 7.0.62.0
> OS Name: Windows 7
> OS Version: 6.1
> Architecture: x86
> JVM Version: 1.7.0_67-b01
> JVM Vendor: Oracle Corporation
1. A Filter can generate the response by itself. There is no need to
call the chain.
An example in Tomcat:
org.apache.catalina.filters.RemoteAddrFilter
org.apache.catalina.filters.RequestFilter#process(...)
2. There are several types of dispatch defined in Servlet specification.
See e.g. javax.servlet.DispatcherType enumeration.
Usually a Filter is configured to serve 'REQUEST' dispatches. Thus an
'ERROR' dispatch (triggered by sendError()) bypasses the filter.
Read about filters in the Servlet specification.
Best regards,
Konstantin Kolinko
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