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How do I add new database Data Resource (database connection) to Tomcat?

ANSWER
The Install Tomcat 7 instructions gives an example on how to add a new Data Resouce to Tomcat,

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Tomcat 7 manager fails when deploying a WAR file when using the AJP connector

When the Tomcat 7 manager tries to deploy a war file, it fails with the following error:

Code Block
Feb 28, 2013 8:20:35 AM org.apache.coyote.ajp.AjpMessage processHeader SEVERE: Invalid message received with signature 8192

ANSWER:

By default, the maximum packet size that can be process by the AJP connector is 8192 bytes. Do the following to change the default:
1. Edit the Tomcat server.xml file located in the conf directory of your Tomcat installation.
2. Find the Connector entry (show below).
  Code Block
  <Connector port="8009" protocol="AJP/1.3" tomcatAuthentication="false" redirectPort="8443" address="127.0.0.1" maxPostSize="536870912" />
3. Add maxHttpHeaderSize="65536" and packetSize="65536" so that the Connector is as follows:
  Code Block
  <Connector port="8009" protocol="AJP/1.3" tomcatAuthentication="false" redirectPort="8443" address="127.0.0.1" maxPostSize="536870912" maxHttpHeaderSize="65536" packetSize="65536" />
4. When you are satisfied with your changes, save your changes and restart your Tomcat server.

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