code: public ManagedObject injectAndPostConstruct(final Object target) throws InjectionException
    {
        final String METHOD_NAME="injectAndPostConstruct";
        
         if (TraceComponent.isAnyTracingEnabled() && logger.isLoggable(Level.FINE)) {
             logger.entering(CLASS_NAME, METHOD_NAME, target);
         }
         
         // PI30335: split inject logic from injectAndPostConstruct
         ManagedObject r = inject(target);
      
          // after injection then PostConstruct annotated methods on the host object needs to be invoked.
          Throwable t = this.invokeAnnotTypeOnObjectAndHierarchy(target, ANNOT_TYPE.POST_CONSTRUCT);
          if (null != t){
              // log exception - and process InjectionExceptions so the error will be returned to the client as an error. 
              if (TraceComponent.isAnyTracingEnabled() && logger.isLoggable(Level.FINE)) {
                  logger.logp(Level.FINE, CLASS_NAME, METHOD_NAME, "Exception caught during post construct processing: " + t);
              }
              if ( t instanceof InjectionException) {
                  InjectionException ie = (InjectionException) t;
                  throw ie;
              } else {
                  // According to spec, can't proceed if invoking PostContruct(s) threw exceptions
                  RuntimeException re = new RuntimeException(t);
                  throw re;
              }
          }
          
          if (TraceComponent.isAnyTracingEnabled() && logger.isLoggable(Level.FINE)) {
              logger.exiting(CLASS_NAME, METHOD_NAME, r);
          }
          return r;
    }
docs: This method injects the target object, then immediately performs PostConstruct operations
  
  @param target the filter, servlet or listener that is being injected into
  @return  This method will either return the managed object if the injection was successful or throw the exception that resulted during the inject or the PostConstruct
  the injection
  @throws InjectionException if there was an error during the injection