Check Java Driver version in clients from Db2 server
This page https://www.ibm.com/support/knowledgecenter/en/SSEPGG_11.1.0/com.ibm.db2.luw.admin.mon.doc/doc/r0001170.html  describes the client_product_id monitor element thus


  Use this element to identify the product and code version of the data server client. It is in the form PPPVVRRM, where:
  
  PPP identifies the product. This is "SQL" for IBM® relational database products.
     VV identifies a 2-digit version number.
     RR identifies a 2-digit release number.
     M identifies a 1-character modification level (0-9 or A-Z).


comparing what CLIENT_PRDID shows 

SELECT distinct CLIENT_PRDID  FROM TABLE(MON_GET_CONNECTION(NULL, -2))


JCC04220


vs the jdbc type 4 driver version

java -cp $DB2_HOME/java/db2jcc4.jar com.ibm.db2.jcc.DB2Jcc -version


IBM Data Server Driver for JDBC and SQLJ 4.22.29


gets a close match for me.  I can't say I know why the mod level is not set.

on a different system, looking at the type 2 driver, I get JCC03690 from CLIENT_PRDID but IBM DB2 JDBC Universal Driver Architecture 3.72.44 from java com.ibm.db2.jcc.DB2Jcc -version.. so it's maybe nearly of right...