问题
I have deployed an axis2 web service on Tomcat 5.5. The web service functions as expected. But I noticed I was getting duplicated log entries. After researching it became clear that multiple instances of the class were being created - ie the first time it ran, one log entry; second time, two entries and so on.
I added the scope="application" parameter, but that has not solved the problem. I added it both in the service tag and as a separate parameter tag to no avail.
This class has many key global variables, logging being one of them. Frustrated as I am, I still haven't gotten to the point of deconstructing the globals (major overhaul, breaks code conventions in my department). Are global variables the culprit? Or is there some other Tomcat/Axis2 config I am missing?
Will post services.xml or other code upon request.
Thanks in advance - Bill
回答1:
I have solved the problem...don't necessarily understand why but I now have the correct behavior...
The services.xml file I created as part of the web service (WEB-INF/services/myService/META-INF) was being overridden by config in tomcat/conf/server.xml, where I had previously only referred to myService with a context block. In order for myService to have unique service-level parameters, it has to have it's own config in tomcat/conf/server.xml...not just a context reference.
It seems to me that this is not the best config...services and contexts in server.xml. It's not dynamic that way. Unfortunately I am following a standard set here many moons ago, so nothing I can do.
来源：https://stackoverflow.com/questions/3777783/tomcat-5-5-axis2-application-scope-problem-unable-to-create-single-instance