0004990: ProxyCacheFilterChain calls getHeader but wrapped HttpServletResponse missing getHeader method - Mantis

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ID

Category

Severity

Reproducibility

Date Submitted

Last Update

0004990

[Resin]

minor

always

03-15-12 16:23

05-22-12 16:14

Reporter

rickHigh

View Status

public

Assigned To

ferg

Priority

normal

Resolution

fixed

Status

closed

Product Version

Summary

0004990: ProxyCacheFilterChain calls getHeader but wrapped HttpServletResponse missing getHeader method

Description

ProxyCacheFilterChain calls getHeader but wrapped HttpServletResponse missing getHeader method.

CauchoResponseWrapper.getHeader is called by ProxyCacheFilterChain.

Here is the code.

CauchoResponseWrapper

  public String getHeader(String name)

  {

    return _response.getHeader(name);

  }

In Resin 3, it checked its own internal getHeader because the Servlet specification did not have a getHeader.
Without the cache control headers, the ProxyCache will not cache the results.

To make this backwards compatible with Resin 3, the proposed changes are as follows:

  public String getHeader(String name)

  {

    return _response.getHeader(name);

  }

In a way, the problem is in their code because they were suppose to subclass javax..HttpServletResponseWrapper not implement javax..HttpServletResponse. HttpServletResponseWrapper was created to avoid this type of problem. But if their code predates Servlet specification 2.3, then it is certainly not their problem. Going to make a note to make sure we do the same type of support for all new methods in our wrapper class.

  public String getHeader(String name)

  {

      try {

          return _response.getHeader(name);

      } catch (AbstractMethodError ame) {

          return null;

      }

  }

The above should do the trick, and make Resin 4 backwards compatible with Resin 3 wrt to ProxyCache.

  public String getHeader(String name) {
      try {
          return _response.getHeader(name);
      } catch (AbstractMethodError ame) {
          return null;
      }
  }

Stack trace...

[12-03-14 11:39:59.208] {http://*:8080-2} [^] java.lang.AbstractMethodError
                        at com.caucho.server.http.CauchoResponseWrapper.getHeader(CauchoResponseWrapper.java:314)
                        at com.caucho.server.httpcache.ProxyCacheFilterChain.fillEntry(ProxyCacheFilterChain.java:1018)
                        at com.caucho.server.httpcache.ProxyCacheFilterChain.startCaching(ProxyCacheFilterChain.java:859)
                        at com.caucho.server.webapp.IncludeResponseStream2.startCaching(IncludeResponseStream2.java:336)
                        at com.caucho.server.webapp.IncludeResponseStream2.flushCharBuffer(IncludeResponseStream2.java:184)
                        at com.caucho.server.http.ToByteResponseStream.flushBuffer(ToByteResponseStream.java:608)
                        at com.caucho.jsp.JspWriterAdapter.close(JspWriterAdapter.java:297)
                        at com.caucho.jsp.JspWriterAdapter.popWriter(JspWriterAdapter.java:280)
                        at com.caucho.jsp.PageContextImpl.release(PageContextImpl.java:1412)
                        at com.caucho.jsp.PageManager.freePageContext(PageManager.java:215)

Additional Information

Relationships

Notes
(0005712) rickHigh 03-15-12 16:30	Fixed in 4.0.27 http://bugs.caucho.com/view.php?id=4990 [^] CauchoResponseWrapper.getHeader is called by ProxyCacheFilterChain. Here is the code. CauchoResponseWrapper public String getHeader(String name) { return _response.getHeader(name); } In Resin 3, it checked its own internal getHeader because the Servlet specification did not have a getHeader. Without the cache control headers, the ProxyCache will not cache the results. To make this backwards compatible with Resin 3, the proposed changes are as follows: public String getHeader(String name) { return _response.getHeader(name); } In a way, the problem is in their code becaue they were suppose to subclass javax..HttpServletResponseWrapper not implement javax..HttpServletResponse. HttpServletResponseWrapper was created to avoid this type of problem. But if their code predates Servlet specification 2.3, then it is certainly not their problem. I am going to make a note to make sure we do the same type of support for all new methods in our wrapper class. public String getHeader(String name) { try { return _response.getHeader(name); } catch (AbstractMethodError ame) { return null; } } The above should do the trick, and make Resin 4 backwards compatible with Resin 3 wrt to ProxyCache.

Issue History
Date Modified	Username	Field	Change
03-15-12 16:23	rickHigh	New Issue
03-15-12 16:30	rickHigh	Note Added: 0005712
03-15-12 16:32	rickHigh	Description Updated
05-22-12 16:14	ferg	Assigned To	=> ferg
05-22-12 16:14	ferg	Status	new => closed
05-22-12 16:14	ferg	Resolution	open => fixed
05-22-12 16:14	ferg	Fixed in Version	=> 4.0.28

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