code: public Object beginContext(ComponentMetaData cmd) { // modified to return object d131914
          if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled()) {
              if (cmd != null)
                  Tr.debug(tc, "begin context " + cmd.getJ2EEName());
              else
                  Tr.debug(tc, "NULL was passed.");
          }
  
          if (cmd == null) {
              Tr.error(tc, "WSVR0603E"); // d143991
              throw new IllegalArgumentException(Tr.formatMessage(tc, "WSVR0603E"));
          }
  
          return threadContext.beginContext(cmd); //131914
      }
docs: Begin the context for the ComponentMetaData provided.
  
  @param ComponentMetaData It Must not be null. Tr.error will be logged if it is null.
  @return Previous Object, which was on the stack. It can be null.