java - How does Spring start this app? -

-

i'm parsing through inherited code of java app deployed war file in jboss, , uses spring, jms, , hornetq. i'm trying figure out, lack of better phrase, makes app "go". of spring examples i've seen include application main() method, imperatively acts on beans provided spring context in way. application has no main(). far can tell, what's happening:

the war file's web.xml uses listener launch spring when application starts in jboss, , passes config file

<listener>     <listener-class>org.springframework.web.context.contextloaderlistener</listener-class> </listener>  <context-param>     <param-name>contextconfiglocation</param-name>     <param-value>classpath:application-context.xml</param-value> </context-param>

spring processes application-context.xml file, includes snippet:

<bean id="jmscontainer"     class="org.springframework.jms.listener.defaultmessagelistenercontainer">     <property name="connectionfactory" ref="connectionfactory" />     <property name="destination" ref="destination" />     <property name="messagelistener" ref="applistenerproxy" />

through couple more references in application-context.xml, "applistenerproxy" refers class in application implements sessionawaremessagelistener, responds messages on queue.

the part that's tripping me don't see kind of code jmscontainer bean , it. well-defined id, such spring framework looking it? , if so, documented somewhere (along other ids framework might looking for)? http://docs.spring.io/spring/docs/current/spring-framework-reference/html/jms.html seemed closest found, doesn't specify whether id in examples convention, or if it's meaningful string.

thanks

containers in spring part of framework core. framework scan containers implement container interface, , initialize them.

this relies on inversion of control (ioc) principle.

for more information on ioc container, check page: ioc container


Comments

Post a Comment

Popular posts from this blog

node.js - Mongoose: Cast to ObjectId failed for value on newly created object after setting the value -

-
this question has answer here: what's mongoose error cast objectid failed value xxx @ path “_id”? 7 answers even though has been asked many times because entity has no valid objectid field. i came across situation objectid set value can casted objectid still error. the schema: var serviceschema = parammongoose.schema({ servicename:{ type: parammongoose.schema.types.objectid , ref: 'servicenames',required:true } }); pseudo code: servicefromdb=new service({servicename:'some name'}); servicefromdb.servicename='000000000000000000000001'; servicefromdb.save(function(paramerror,paramdata){ if(paramerror){ console.log('but but...',servicefromdb,paramerror) } }); the output of code is: but but... { servicename: 000000000000000000000001, _id: 55079a90286f49280364f78b } { [casterror: cast objectid faile...
Read more

gradle error "Cannot convert the provided notation to a File or URI" -

-
i have defined 2 system properties in gradle.properties: systemprop.builddir=build systemprop.cfgdir=build\\cfg and have following task defined in build.gradle: task clean(group:'clean',description:'clean project') << { ant.sequential { delete(dir: system.properties.builddir) mkdir(dir: system.properties.builddir) delete(dir: system.properties.cfgdir) mkdir(dir: system.properties.cfgdir) } } this generates following error: execution failed task ':clean'. > cannot convert provided notation file or uri: {dir=build}. following types/formats supported: - string or charsequence path, e.g 'src/main/java' or '/usr/include' - string or charsequence uri, e.g 'file:/usr/include' - file instance. - uri or url instance. but equivalent block of code not generate error , works expected: task clean(group:'clean',description:'clean project') << { ...
Read more

python - NameError: name 'subprocess' is not defined -

-
i'm trying make rng website: http://jamesdotcom.com/?p=417 . when run following code: captureimage = subprocess.popen( [ "fswebcam", "-r", "356x292", "-d", "/dev/video0", "static.jpg", "--skip", "10" ], stdout=devnull, stderr=devnull) captureimage.communicate() i following error message: nameerror: name 'subprocess' not defined what should do? thanks have imported first? import subprocess captureimage = subprocess.popen(["fswebcam", ...) subprocess included in python standard library since python 2.4. should not necessary install it.
Read more