java - Spring: @Value vs. @Autowired -


i'm having issues injection in application i'm working on (using spring version 3.1.2). start with, i'm seeing lot of code this:

@value("#{searchrequestbean}") private searchrequest searchrequest;  @value("#{searchresponsebean}") private searchresponse searchresponse;  @autowired private savedsearchservice service;

each of these 3 appears have effect of autowiring specified bean/service class. don't understand is, what's difference between @value , @autowired in these cases? every example find online seems use @value inject values properties file. in case, searchresponse , searchrequest abstract classes.

i'm hoping better understanding of me solve issues i'm having session bean.

@value can used injecting default values. example inject default of string value of property file. in example, @value used set default value of class spring managed bean.

@autowired can't used first example: it's not property file aware. @autowired only di of bean. more specific @value, can use @value same thing.

here tutorial @value: http://www.mkyong.com/spring3/spring-value-default-value/


-

Popular posts from this blog

debugging - Reference - What does this error mean in PHP? -

what this? this number of answers warnings, errors , notices might encounter while programming php , have no clue how fix. community wiki, invited participate in adding , maintaining list. why this? questions "headers sent" or "calling member of non-object" pop on stack overflow. root cause of questions same. answers questions typically repeat them , show op line change in his/her particular case. these answers not add value site because apply op's particular code. other users having same error can not read solution out of because localized. sad, because once understood root cause, fixing error trivial. hence, list tries explain solution in general way apply. what should here? if question has been marked duplicate of this, please find error message below , apply fix code. answers contain further links investigate in case shouldn't clear general answer alone. if want contribute, please add "favorite" error message, warning or notic...
Read more

c++ - Why doesn't unordered_set provide an array access operator -

i'm curious why stl container unordered_set , has constant time complexity random access on average, not provide method accessing elements distance first element in container. example: t& unordered_set::operator[](size_t index) { return *(begin() + index); } accessing element "by distance" implies there meaningful way measure distance. trouble std::unordered_set is is, well, unordered . hence, there no meaningful way of explaining "some distance beginning" in non-arbitrary way. if want access distance, copy data vector: std::vector tmp(unordered.begin(), unordered.end());
Read more