Hi,

What is the providerString that you passing in the API call?

We may need to look into JTAPI logs to see what is going wrong. I will let DevSupport team help you in obtaining the debug level JTAPI logs from proper channel.

Thanks,
Abhishek M.
Cisco JTAPI Development Team

I confirmed the Java version is 1.4.2

This is running on i5/OS, I don't think jtprefs works there.

I have another question (this time from a Windows test environment). I can connect my provider, but the getTerminals() method only works rarely. I will get 1 terminal and then try again with the same user and not get any.

Solve the intermittent problem, I needed a delay before using the provider.

Here is the log data:
Cisco Jtapi version 6.1(1.1000)-1 Release
0: Dec 03 15:23:39.550 CST %JTAPI-MISC-7-UNKP1-) started preloading classes
1: Dec 03 15:23:39.583 CST %JTAPI-MISC-7-UNKP1-) finished preloading classes
2: Dec 03 15:23:39.602 CST %JTAPI-CTI-7-UNKP1-) JVM Field Order is onethreetwo
3: Dec 03 15:23:39.602 CST %JTAPI-CTI-7-UNKP1-) EventThread wakeups are disabled
4: Dec 03 15:23:39.602 CST %JTAPI-CTI-7-UNKP1-) EventThread queue statistics are disabled
5: Dec 03 15:23:39.602 CST %JTAPI-CTI-7-UNKP1-) EventThread queue size threshold is 25
6: Dec 03 15:23:39.602 CST %JTAPI-CTI-7-UNKP1-) Provider retry interval is set to 30 seconds
7: Dec 03 15:23:39.602 CST %JTAPI-CTI-7-UNKP1-) Client desired server heartbeat time is set to 30 seconds
8: Dec 03 15:23:39.603 CST %JTAPI-CTI-7-UNKP1-) CTI request timeout is is set to 30 seconds
9: Dec 03 15:23:39.603 CST %JTAPI-CTI-7-UNKP1-) Provider open request timeout is set to 200 seconds
10: Dec 03 15:23:39.603 CST %JTAPI-CTI-7-UNKP1-) Provider priority is set to 2
11: Dec 03 15:23:39.623 CST %JTAPI-CTIIMPL-7-UNKP1-) Provider.info(CCMEncryption: Constructor)
12: Dec 03 15:23:39.623 CST %JTAPI-CTIIMPL-7-UNKP1-) Provider.info(Exiting CCMEncryption())
13: Dec 03 15:23:39.630 CST %JTAPI-CTIIMPL-7-UNKP1-) Provider.info(Entering CCMEncryption::encryptPassword.)
14: Dec 03 15:23:40.023 CST %JTAPI-CTIIMPL-7-UNKP1-) Provider.info(Exiting CCMEncryption::encryptPassword.success)
15: Dec 03 15:23:40.023 CST %JTAPI-CTIIMPL-7-UNKP1-) application did not set appinfo, creating default
16: Dec 03 15:23:40.023 CST %JTAPI-JTAPIIMPL-7-UNKroviderImpl(): calling jtapiProperties.getSecurityPropertyForInstance()
17: Dec 03 15:23:40.030 CST %JTAPI-JTAPIIMPL-7-UNKP1-joannak) TraceModule: JTAPI version Cisco Jtapi version 6.1(1.1000)-1 Release
18: Dec 03 15:23:40.030 CST %JTAPI-JTAPIIMPL-7-UNKP1-joannak) Route Select Timeout is 5000 msecs
19: Dec 03 15:23:40.030 CST %JTAPI-JTAPIIMPL-7-UNKP1-joannak) Jtapi post condition timeout is set to 15 seconds
20: Dec 03 15:23:40.030 CST %JTAPI-JTAPIIMPL-7-UNKP1-joannak) IgnoreFwdDestination set to false
21: Dec 03 15:23:40.031 CST %JTAPI-CTIIMPL-7-UNKP1-joannak) Opening server "10.10.1.1" login "joannak"
22: Dec 03 15:23:40.031 CST %JTAPI-CTIIMPL-7-UNKP1-joannak) ProviderID = P1-joannak
23: Dec 03 15:23:40.063 CST %JTAPI-CTIIMPL-7-UNKP1-joannak) Trying to create normal socket connection to 10.10.1.1
24: Dec 03 15:23:40.103 CST %JTAPI-CTIIMPL-7-UNKP1-joannak) connected
25: Dec 03 15:23:40.130 CST %JTAPI-MISC-7-UNKP1-10.10.1.1) EventThread: created
26: Dec 03 15:23:40.132 CST %JTAPI-MISC-7-UNKP1-10.10.1.1) EventThread starting up...
27: Dec 03 15:23:40.681 CST %JTAPI-MISC-7-UNKP1-10.10.1.1) ReceiveThread starting up...

The exception that I receive when I have this level of logging active is:
Exception in thread "Thread-0" java.lang.NullPointerException
at java.lang.Throwable.<init>(Throwable.java:181)
at java.lang.Exception.<init>(Exception.java:29)
at java.lang.RuntimeException.<init>(RuntimeException.java:32)
at java.lang.NullPointerException.<init>(NullPointerException.java:36
)
at com.cisco.cti.protocol.ProtocolElement.class$com$cisco$cti$protoco
l$ClientCallHandle(CTQF:0)
at com.cisco.cti.protocol.ProtocolElement.toString(CTQF:0)
at java.lang.StringBuffer.append(StringBuffer.java:220)
at com.cisco.cti.client.implementation.Provider.handleMessage(CTQF:0)
at com.cisco.cti.client.implementation.ResponseTable.I(CTQF:0)
at com.cisco.cti.client.implementation.Provider.sessionEnded(CTQF:0)
at com.cisco.cti.client.implementation.Provider.tryOpen(CTQF:0)
at com.cisco.cti.client.implementation.Provider.Open(CTQF:0)
at com.cisco.jtapi.ProviderImpl.<init>(CTQF:0)
at com.cisco.jtapi.CiscoJtapiPeerImpl.getProvider(CTQF:0)
at com.ibm.i.teleserver.ProviderTest.main(ProviderTest.java:19)

The code works when I run the same jar file under windows.

This looks like possibly a JVM-related issue.  Can you confirm the JVM/version and full OS/version?
 
Check the JTAPI developer guide for a list of tested/supported OS/JVM combinations.