code: public synchronized boolean variablesChanged() {
          for (Map.Entry<String, Object> entry : variableCache.entrySet()) {
              String variableName = entry.getKey();
              Object oldVariableValue = entry.getValue();
              Object newVariableValue = lookupVariable(variableName);
              if (newVariableValue == null) {
                  newVariableValue = defaultVariableCache.get(variableName);
              }
              if (!isEqual(oldVariableValue, newVariableValue)) {
                  if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled()) {
                      Tr.debug(tc, "Variable " + variableName + " has changed. Old value: " + oldVariableValue + " New value: " + newVariableValue);
                  }
                  return true;
              }
          }
          return false;
      }
docs: /*
  Checks cached variable values against the current variable values.
  Returns true if at least one variable has changed. False, otherwise.