3.3.1 JSMOPEN
The JSMOPEN is always executed first. It is used to connect the JSM client to the Java Service Manager and to start a thread for the service. Each client will have its own thread.
The server argument is optional for the connection. If the server argument is not supplied, or if the argument value contains blanks, then the remote host and port number is obtained from the data area JSMCLTDTA on IBM i.
The server argument can have any of the following values:
|
host:port |
Use specified host and port |
|
host |
Use host and get port from JSMCLTDTA |
|
:port |
Use port and get host from JSMCLTDTA |
|
: |
Get host and port from JSMCLTDTA |
|
|
Get host and port from JSMCLTDTA |
The JSMOPEN must be executed before the JSMCMD can be used.
The JSMOPEN API performs a DNS lookup to resolve the host name address. Using a dotted decimal IP address does not get around this DNS lookup.
If the JSMOPEN API is slow to open a connection then you could have a DNS lookup issue. Add an entry to the local host table to improve performance.
TCP/IP connection performance can be improved if the registered DNS servers are available and performing well.
Change TCP/IP Domain
Host name search priority *LOCAL
Domain name server
Internet address 139.130.4.4
203.48.48.13
If the first Domain Name Server (DNS) in the list does not respond, the second DNS server in the list will be contacted. If the second DNS server does not respond, the third DNS server will be contacted.
See IBM i - Network Performance for further information.