Hi:
Below is the answer to your question regarding user-defined lb. I think the other questions are being handled at -
http://forums.java.net/jive/thread.jspa?messageID=261545
When using the Sun Web Server the printf statements in the user-defined lb sample roundrobin.c are routed to the web-server's error.log file. In the case of IIS, you will need to modify the roundrobin.c file to open a file pointer to a log file of your choice and use fprintf statements.
Example -
FILE *pLogFile1;
pLogFile1=fopen("c:\\InetPub\\wwwroot\\sun-passthrough\\lb.log","a");
// Now, you can use statements like below
fprintf(pLogFile1, "There are %d listeners\n", noOfListeners);
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http://forums.java.net/jive/thread.jspa?messageID=261568