tomcat-valves

Custom Tomcat valves to help debug a few special cases in Tomcat applications.

SessionSerializableCheckerValve

This valve will check all session attributes on each request and log a warning if one of the attribute is not serializable. We check that the object's class implements java.io.Serializable and that it can be written to an ObjectOutputStream.

To use it, add the following line in your server.xml, as part of an Engine, Host or Context:

<valve classname="ch.ledcom.tomcat.valves.SessionSerializableCheckerValve">

SessionSizeValve

This valve will print the size of each session.

To use it, add the following line in your server.xml, as part of an Engine, Host or Context :

<valve classname="ch.ledcom.tomcat.valves.SessionSizeValve">

RequestAllocationRecorderValve

This valve will print the amount of memory allocated by each HTTP request.

The following system properties can be used to further configure it :

ch.ledcom.tomcat.valves.allocation.RequestAllocationRecorderValve.disabled

Disable the valve

ch.ledcom.tomcat.valves.allocation.RequestAllocationRecorderValve.printSummary

Will also print a summary of the allocation for all requests

ch.ledcom.tomcat.valves.allocation.RequestAllocationRecorderValve.printSummary.period

Print the summary for one in period requests

AllocationAdvice

Can be used with Spring AOP to record allocation in part of your code. See code for details.