Server Configuration Reference
The JK 2 Connector
The JK 2 Connector element represents a
Connector component that communicates with a web
connector via the
AJP protocol. This is used for cases
where you wish to invisibly integrate Tomcat 4 into an existing (or new)
Apache installation, and you want Apache to handle the static content
contained in the web application, and/or utilize Apache's SSL
processing. In many application environments, this will result in
better overall performance than running your applications under
Tomcat stand-alone using the HTTP/1.1 Connector.
However, the only way to know for sure whether it will provide better
performance for your application is to try it both
This connector supports load balancing when used in conjunction with
jvmRoute attribute of the
All implementations of Connector
support the following attributes:
Java class name of the implementation to use. This class must
You must specify the standard value defined below.
true if you want calls to
request.getRemoteHost() to perform DNS lookups in
order to return the actual host name of the remote client. Set
false to skip the DNS lookup and return the IP
address in String form instead (thereby improving performance).
By default, DNS lookups are disabled.
If this Connector is supporting non-SSL
requests, and a request is received for which a matching
<security-constraint> requires SSL transport,
Catalina will automatically redirect the request to the port
number specified here.
Set this attribute to the name of the protocol you wish to have
returned by calls to
example, you would set this attribute to "
for an SSL Connector. The default value is "
Set this attribute to
true if you wish to have
request.isSecure() to return
for requests received by this Connector (you would want this on an
SSL Connector). The default value is
This specifies the character encoding used to decode the URI bytes,
after %xx decoding the URL. If not specified, ISO-8859-1 will be used.
This specifies if the encoding specified in contentType should be used
for URI query parameters, instead of using the URIEncoding. This
setting is present for compatibility with Tomcat 4.1.27 and earlier.
The default value is
The standard implementation of JK 2 Connector is
org.apache.coyote.tomcat4.CoyoteConnector, but you
must specify the protocolHandlerClassName attribute (see below).
This implementation supports the AJP/1.3 protocol.
It supports the following additional attributes (in addition to the
common attributes listed above):
The maximum queue length for incoming connection requests when
all possible request processing threads are in use. Any requests
received when the queue is full will be refused. The default
value is 10.
The debugging detail level of log messages generated by this
component, with higher numbers creating more detailed output.
If not specified, this attribute is set to zero (0).
The maximum number of request processing threads to be created
by this Connector, which therefore determines the
maximum number of simultaneous requests that can be handled. If
not specified, this attribute is set to 20.
The number of request processing threads that will be created
when this Connector is first started. This
attribute should be set to a value smaller than that set for
maxProcessors. The default value is 5.
The TCP port number on which this Connector
will create a server socket and await incoming connections. Your
operating system will allow only one server application to listen
to a particular port number on a particular IP address.
This attribute value must be
org.apache.jk.server.JkCoyoteHandler to use the JK 2