Communication error, CPIC return code 020, SAP return code 223

Hello.

I have system NetWeatver 2004s

Client 101 is a client process integration, UME in ABAP

Sometimes java is restarted...

At that moment in SM21 I can see next log:

16:03:36 RD S2 3 Connection to CPI-C client 016 was closed

16:03:36 RD S7 4 > Partner LU name:

16:03:36 RD S0 R > Host: 10.0.0.53

16:03:36 RD S0 I > Partner TP Name: jlaunch

16:03:36 DIA 007 101 SAPJSF R4 9 Communication error, CPIC return code 020, SAP return code 223

16:03:36 DIA 007 101 SAPJSF R5 A > Conversation ID: 64435936

16:03:36 DIA 007 101 SAPJSF R6 4 > CPI-C function: CMSEND(SAP)

What is this? Why JAVA is restarted ?