web.xml - Where is the right place for spring configuration files? -

-

why there must <init-param> in <servlet> node <param-name> "contextconfiglocation" ? because if comment <init-param> group project not load?

<?xml version="1.0" encoding="utf-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemalocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="webapp_id" version="3.0">    <display-name>archetype created web application</display-name>    <!-- spring mvc dispatcher servlet -->     <servlet>         <servlet-name>mvc-dispatcher</servlet-name>         <servlet-class>org.springframework.web.servlet.dispatcherservlet</servlet-class>         <init-param>             <param-name>contextconfiglocation</param-name>             <param-value></param-value>         </init-param>         <load-on-startup>1</load-on-startup>     </servlet>     <servlet-mapping>         <servlet-name>mvc-dispatcher</servlet-name>         <url-pattern>/</url-pattern>     </servlet-mapping>      <listener>         <listener-class>org.springframework.web.context.contextloaderlistener</listener-class>     </listener>     <!-- loads spring configurations files -->     <context-param>         <param-name>contextconfiglocation</param-name>         <param-value>             /web-inf/spring-mvc.xml,             /web-inf/spring-security.xml,             /web-inf/hibernate-context.xml         </param-value>     </context-param>          <!-- spring security filter -->     <filter>         <filter-name>springsecurityfilterchain</filter-name>         <filter-class>org.springframework.web.filter.delegatingfilterproxy</filter-class>     </filter>      <filter-mapping>         <filter-name>springsecurityfilterchain</filter-name>         <url-pattern>/*</url-pattern>     </filter-mapping>  </web-app>

what right place spring configuration files ?

you can load spring configuration files either through <context-param> or <init-param> of servlet class. but, there difference explained below:

if loading using <context-param>, dependencies (spring beans) available whole application (for servlets). used load common dependencies across whole application (like services, daos, etc..).

but, if loading using <init-param> of dispatcherservlet, dependencies (spring beans) available dispatcherservlet child context. so, if have multiple entry end points application (like restlet or apache cxfservlet etc..), can maintain child contexts 1 per each servlet (entry point). each child context owns/loads specific dependencies respective web tier.

you can @ below notes taken spring's webapplicationcontext api:

like generic application contexts, web application contexts hierarchical. there single root context per application, while each servlet in application (including dispatcher servlet in mvc framework) has own child context.

you can here , here


Comments

Post a Comment

Popular posts from this blog

asp.net - How to correctly use QUERY_STRING in ISAPI rewrite? -

-
i'm having difficult time , hope guys can help. using helicon isapi rewrite version 3.1.0.104 on our iis server. edit http.conf file , have tried , still fail. this trying do: redirect url: https://www.domain.com/switch-by-version?version=2.8.5.2594 to: https://test.domain.com/load/load.aspx?tver=2.8.5.2594 the version number @ end source url change, , need target url have same version number @ end of url example above shows. i tried following not work: rewritecond %{query_string} ^version=(\d\d?)\.(\d\d?)\.(\d\d?)\.(.*)$ [nc] rewriterule ^/switch-by-version(.*)$ https://test.domain.com/load/load.aspx?tver=%1 [r=307,nc,l] any appreciated! thanks. if it's running in equivalent context of .htaccess , rule shouldn't start / . here's simpler version: rewritecond %{query_string} ^version=(\d+\.\d+\.\d+(?:\..+)?)$ [nc] rewriterule ^switch-by-version/?$ https://test.domain.com/load/load.aspx?tver=%1 [r=307,nc,l]
Read more

jsf - "PropertyNotWritableException: Illegal Syntax for Set Operation" error when setting value in bean -

-
this question has answer here: how send form input values , invoke method in jsf bean 1 answer i error when trying send values jsf page bean. i want set values fields in bean, create airplane instance , add database. error telling me use illegal syntax setter part of bean. why error? didnt find on site helped me problem. here jsf part: <h4>add plane</h4> <c:if test="#{not empty listairplanebb.error}"> <div class="alert alert-danger"> <span class="glyphicon glyphicon-remove"></span> <h:outputtext value="#{listairplanebb.error}" /> </div> </c:if> <h:form> <table class="table"> <thead> ...
Read more

arrays - Algorithm to find ideal starting spot in a circle -

-
so problem have been debating such: your given array of integers representing circle. then, have pick spot in circle start. place start, compare value @ array number of steps took there , if steps less or equal number, include in final set. find place start have elements in set. ex, a=[0, 1, 2] if start @ index=0, then: a[0]=0 < =0 0 included a[1]=1 < =1 1 included a[2]=2 < =2 2 included final set: {0,1,2} if start @ index=1, then: a[1]=1 > 0 1 not included a[2]=2 > 1 2 not included here loop around a[0]=0 > 2 0 included final set: {0} if start @ index=2, then: a[2]=2 > 0 2 not included, here loop around a[0]=0 < = 1 0 included a[1]=1 < = 2 1 included final set: {0,1} so in trivial case, starting position index=0 best position results in final set elements. brute force method of finding obvious, trying find more efficient method. attempts far have been examine trying find max intersect of viable starting ranges calculated each element in arr...
Read more