[Slightly OT] GZIP compression filter and java.lang.IllegalStateException: Cannot create a session...

[Kaspar Fischer]

Hi,

I've tried to install a compression filter and followed
  http://www.nabble.com/-slight-OT--GZip-compression-filter- 
td6901991.html

for this.

When I load my page, I get an exception (see below) about a OGNL  
expression
that could not be parsed and "Cannot create a session after the  
response has
been committed". (It works without the GZIP compression.)

My configuration is:

<web-app>
  <!-- lots of other stuff -->
  <filter>
  <filter-name>CompressingFilter</filter-name>
  <filter- 
class>com.planetj.servlet.filter.compression.CompressingFilter</ 
filter-class>
  <!-- Adobe's plugin for IE chokes on gzip'ed PDFs -->
  <init-param>
   <param-name>excludeContentTypes</param-name>
   <param-value>application/pdf</param-value>
  </init-param>
  <init-param>
   <param-name>excludePathPatterns</param-name>
   <param-value>.*\.pdf</param-value>
  </init-param>
 </filter>

 <filter-mapping>
  <filter-name>CompressingFilter</filter-name>
  <url-pattern>/*</url-pattern>
  <dispatcher>REQUEST</dispatcher>
 </filter-mapping>
</web-app>

Does anybody know how I can fix this?

Thanks in advance!
Kaspar

P.S. I post (see link above) also mentions code; I have not changed/ 
added
any code. Should I have done?

--

javax.servlet.ServletException: Unable to parse OGNL expression  
'loginSession.isLoggedIn()': loginSession

org.apache.hivemind.ApplicationRuntimeException: Unable to parse OGNL  
expression 'loginSession.isLoggedIn()': loginSession
   location: context:/WEB-INF/Border.html, line 121

org.apache.tapestry.BindingException: Unable to parse OGNL expression  
'loginSession.isLoggedIn()': loginSession
   binding: ExpressionBinding[null loginSession.isLoggedIn()]
   location: context:/WEB-INF/Border.html, line 121

org.apache.hivemind.ApplicationRuntimeException: Unable to parse OGNL  
expression 'loginSession.isLoggedIn()': loginSession

ognl.OgnlException: loginSession

java.lang.IllegalStateException: Cannot create a session after the  
response has been committed
org.apache.catalina.connector.Request.doGetSession(Request.java:2221)
org.apache.catalina.connector.Request.getSession(Request.java:2031)
org.apache.catalina.connector.RequestFacade.getSession 
(RequestFacade.java:832)
org.apache.tapestry.web.ServletWebRequest.getSession 
(ServletWebRequest.java:81)
...

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