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The "HowTo" page has been changed by KonstantinKolinko:
http://wiki.apache.org/tomcat/HowTo?action=diff&rev1=129&rev2=130

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- A few caveats arise, as for instance while the `System.out` and `System.err` 
are redirected as per above, no logging of these is done to files. You will 
need more legwork to do to make the additional logging. It is important to 
backup and restore the original streams as the above example does. Also, notice 
the use of `getOutputStream()`: when this method is called, the `getWriter()` 
method can no longer be used in the same response object.
+ A few caveats arise, as for instance while the `System.out` and `System.err` 
are redirected as per above, no logging of these is done to files. You will 
need more legwork to do to make the additional logging. It is important to 
backup and restore the original streams as the above example does. The servlet 
should not be used to process several requests in parallel (some 
synchronization should be added to the above code to prevent that). Also, 
notice the use of `getOutputStream()`: when this method is called, the 
`getWriter()` method can no longer be used in the same response object.
  
  Corrections and comments are most welcome!
  
  == How do I connect to a Websphere MQ (MQ Series) server using JMS and JNDI? 
==
- Basically, this works just as described in  
http://tomcat.apache.org/tomcat-5.5-doc/jndi-resources-howto.html: Within your 
application, you are using the standard JNDI and JMS API calls. In web.xml (the 
container independent application descriptor), you specify resource references 
(stub resources). And in context.xml (the container specific application 
descriptor), you are actually configuring the JMS connection.
+ Basically, this works just as described in  
http://tomcat.apache.org/tomcat-7.0-doc/jndi-resources-howto.html: Within your 
application, you are using the standard JNDI and JMS API calls. In web.xml (the 
container independent application descriptor), you specify resource references 
(stub resources). And in context.xml (the container specific application 
descriptor), you are actually configuring the JMS connection.
  
  More to the point. Here's some example code, which might be added to a 
Servlet. The example is sending a message to an MQ server:
  

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