Re: Apache Tomcat hangs

[Raquel Hernández Martinez <rh...@evendor.es>]

Hi Christopher,

my jsp invoke to the servlet and it writes a
pdf into a file ant send it by email. I need this functionality 
because it´s the user who decides to generate or not this report. My
version of jasper report it´s 2.0, I don´t know if it´s
can be a bug for this version, because my tomcat hangs when it´s
generate a pdf and after one hour appears this
error. Do you think that this can be hang the tomcat?

I´ll try set session="true" and test it.

Many
thanks for your help Chris.

Raquel

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>
Raquel, 
> 
> On 5/29/2009 6:35 AM, Raquel
Hernández Martinez wrote: 
>> I am using apache
Tomcat 5.5 which is set up on a hp-ux machine. 
>> my
application uses jaspert-reports 
>> At times during we use
jaspert-rerpot for generate to a pdf, get an 
>> error 
>> as shown below, and this causes the servers hangs and can not
log on the 
>> tomcat console and application. 
> 
> Ugh... are you really using JSP to generate a PDF through jasper

> reports? Does the JSP actually generate a PDF to the output
stream, or 
> do you write the PDF to a file and then redirect to
it or something like 
> that? 
> 
> JSP wasn't
designed to generate binary content, although it /can/ be 
>
beaten into submission in order to do so. 
> 
>>
SEVERE: Exception initializing page context 
>>
java.lang.IllegalStateException: Cannot create a session after the 
>> response has been committed 
>> at
org.apache.catalina.connector.Request.doGetSession(Unknown 
>>
Source) 
> 
> [snip] 
> 
>> at 
>> org.apache.catalina.core.ApplicationDispatcher.include(Unknown

>> Source) 
>> at
org.apache.jasper.runtime.JspRuntimeLibrary.include(Unknown 
>>
Source) 
>> at 
>>
org.apache.jsp.jsp.Alarma_Detalle_Service_jsp._jspService(Alarma_Detalle_Service_jsp.java:122)

> 
> The problem is that you are "including"
one page from another, and the 
> page you are calling requires a
session. The including page apparently 
> does /not/ need a
session, and so the included page tries to create one. 
> 
> In spite of the fact that the servlet spec specifically forbids
this, 
> Tomcat is trying it, anyway, and when the session is
created, a 
> Set-Cookie header needs to be sent to the browser.
If the headers have 
> already been sent, you get this error. 
> 
> Solutions? 
> 
> I'd set
session="true" in "Alarma 
Detalle Service.jsp"
and see if that 
> helps. 
> 
> I'd also try not
to generate PDF output from a JSP ;) 
> 
> - -chris 
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