hibernate - Spring and null pointer exception -

-

i'm trying this:

@controller     public class homecontroller {          @autowired         private templatesservice templatesservice;              public final string test = templatesservice.geturi();

the geturi:

@suppresswarnings("unchecked")     public string geturi() {          return (string) sessionfactory.getcurrentsession()                 .createquery("select uri templates state=1")                 .uniqueresult();     }

it work correctly, if i'll declare test in method. i'm having this:

org.springframework.beans.factory.beancreationexception: error creating bean name 'homecontroller' defined in file [c:\users\anton\springsource\vfabric-tc-server-developer-2.8.2.release\base-instance\wtpwebapps\blog\web-inf\classes\net\babobka\blog\controller\homecontroller.class]: instantiation of bean failed; nested exception org.springframework.beans.beaninstantiationexception: not instantiate bean class [net.babobka.blog.controller.homecontroller]: constructor threw exception; nested exception java.lang.nullpointerexception     @ org.springframework.beans.factory.support.abstractautowirecapablebeanfactory.instantiatebean(abstractautowirecapablebeanfactory.java:997)     @ org.springframework.beans.factory.support.abstractautowirecapablebeanfactory.createbeaninstance(abstractautowirecapablebeanfactory.java:943)     @ org.springframework.beans.factory.support.abstractautowirecapablebeanfactory.docreatebean(abstractautowirecapablebeanfactory.java:485)     @ org.springframework.beans.factory.support.abstractautowirecapablebeanfactory.createbean(abstractautowirecapablebeanfactory.java:456)     @ org.springframework.beans.factory.support.abstractbeanfactory$1.getobject(abstractbeanfactory.java:294)     @ org.springframework.beans.factory.support.defaultsingletonbeanregistry.getsingleton(defaultsingletonbeanregistry.java:225)     @ org.springframework.beans.factory.support.abstractbeanfactory.dogetbean(abstractbeanfactory.java:291)     @ org.springframework.beans.factory.support.abstractbeanfactory.getbean(abstractbeanfactory.java:193)     @ org.springframework.beans.factory.support.defaultlistablebeanfactory.preinstantiatesingletons(defaultlistablebeanfactory.java:585)     @ org.springframework.context.support.abstractapplicationcontext.finishbeanfactoryinitialization(abstractapplicationcontext.java:913)     @ org.springframework.context.support.abstractapplicationcontext.refresh(abstractapplicationcontext.java:464)     @ org.springframework.web.context.contextloader.configureandrefreshwebapplicationcontext(contextloader.java:385)     @ org.springframework.web.context.contextloader.initwebapplicationcontext(contextloader.java:284)     @ org.springframework.web.context.contextloaderlistener.contextinitialized(contextloaderlistener.java:111)

my root-context(i don't think it's helpful):

    <context:annotation-config />       <context:component-scan base-package="net.babobka.blog" />     <mvc:resources mapping="/resources/**" location="/resources/" />     <cache:annotation-driven />      <bean id="cachemanager" class="org.springframework.cache.support.simplecachemanager">         <property name="caches">             <set>                 <bean                     class="org.springframework.cache.concurrent.concurrentmapcachefactorybean"                     p:name="template" />                 <bean                     class="org.springframework.cache.concurrent.concurrentmapcachefactorybean"                     p:name="headhunter" />              </set>         </property>     </bean>      <bean id="converter" class="net.babobka.blog.headhunter.converter" />       <bean id="propertyconfigurer"         class="org.springframework.beans.factory.config.propertyplaceholderconfigurer"         p:location="/web-inf/db/jdbc.properties" />      <bean id="datasource" class="org.apache.commons.dbcp.basicdatasource"         destroy-method="close" p:driverclassname="${jdbc.driverclassname}"         p:url="${jdbc.databaseurl}" p:username="${jdbc.username}" p:password="${jdbc.password}" />     <bean id="sessionfactory"         class="org.springframework.orm.hibernate3.localsessionfactorybean">         <property name="datasource" ref="datasource" />         <property name="configlocation">             <value>/web-inf/db/hibernate.cfg.xml</value>         </property>         <property name="configurationclass">             <value>org.hibernate.cfg.annotationconfiguration</value>         </property>         <property name="hibernateproperties">             <props>                 <prop key="hibernate.dialect">${jdbc.dialect}</prop>                 <prop key="hibernate.show_sql">${jdbc.show_sql}</prop>                 <prop key="hibernate.connection.useunicode">true</prop>                 <prop key="hibernate.connection.characterencoding">utf-8</prop>                 <prop key="hibernate.connection.charset">utf-8</prop>             </props>         </property>     </bean>         <bean id="transactionmanager"         class="org.springframework.orm.hibernate3.hibernatetransactionmanager">         <property name="sessionfactory" ref="sessionfactory" />     </bean>     <mvc:annotation-driven />     <tx:annotation-driven />     <task:annotation-driven />        <bean id="backupper" class="net.babobka.blog.backupper.backupper"></bean>      <bean id="olddataremoval" class="net.babobka.blog.termination.olddataremoval"></bean>      <bean id="headhunterimport" class="net.babobka.blog.headhunter.headhunterimport"></bean>      <bean id="urlforwardcontroller"         class="org.springframework.web.servlet.mvc.urlfilenameviewcontroller" />      <bean id="tilesconfigurer"         class="org.springframework.web.servlet.view.tiles2.tilesconfigurer">         <property name="definitions">             <list>                 <value>/web-inf/tiles.xml</value>             </list>         </property>     </bean>      <bean id="viewresolver"         class="org.springframework.web.servlet.view.urlbasedviewresolver">         <property name="viewclass"             value="org.springframework.web.servlet.view.tiles2.tilesview" />     </bean>      </beans>

what's wrong?

it's not working because templatesservice not yet injected when reference set test. fields injection work after instantiation of object. need solve use @postconstruct set test.

@controller     public class homecontroller {      @autowired     private templatesservice templatesservice;          public string test;      @postconstruct     public void init() {        this.test = templatesservice.geturi();     }

if still want use final, can use injection constructor , set test then.

  @controller       public class homecontroller {      private templatesservice templatesservice;          public final string test;      @autowired     public homecontroller(templatesservice templatesservice) {         this.templatesservice = templatesservice;         this.test = templatesservice.geturi();     }

Comments

Post a Comment

Popular posts from this blog

c# - How Configure Devart dotConnect for SQLite Code First? -

-
can configure following sample code ? when run following code, error : no entity framework provider found ado.net provider invariant name 'devart.data.sqlite' setting in machine.config <system.data> <dbproviderfactories> <add name="dotconnect sqlite" invariant="devart.data.sqlite" description="devart dotconnect sqlite" type="devart.data.sqlite.sqliteproviderfactory, devart.data.sqlite, version=4.6.287.0, culture=neutral, publickeytoken=09af7300eec23701" /> </dbproviderfactories> </system.data> after add below block code in app.config <?xml version="1.0"?> <configuration>   <configsections> <!-- more information on entity framework configuration, visit http://go.microsoft.com/fwlink/?linkid=237468 --> <section name="entityframework" type="system.data.entity.internal.configfile.entityframeworksection, entit...
Read more

c++ - Clear the memory after returning a vector in a function -

-
i have function processes , stores lot of data in , returns results vector of class. amount of data stored in function tremendous , want clear storage memory of function after finished job. necessary (does function automatically clear memory) or should clear memory function? update: vector<customers> process(char* const *filename, vector<int> id) { vector<customers> list_of_customers; (perform actions) return list_of_customers; } variables defined locally within function automatically released @ end of function scope. destructors objects called, should free memory allocated objects (if objects coded correctly). example of such object std::vector . anything you've allocated new must have corresponding delete release storage. try avoid doing own allocation , use raii instead, i.e. containers or smart pointers.
Read more

erlang - Saving a digraph to mnesia is hindered because of its side-effects -

-
updated the digraph library in erlang implements data type side-effectful. each operation on data type saves new state in ets table -- instead of returning altered version of itself, more common in functional languages. the problem usage perspective, impedes effort store or pass around state in convenient way requiring me first "collect" state before can start juggle around. the closest solution have seen far serializer/deserializer , these have drawback tied current structure of digraphs instead of operating on abstract type -- prevents future proof solution. update pascal pointed out serializer utilizes interface of digraph, , hence eliminates drawback mentioned above. better, albeit still inconvenient, see no better alternative. what recommendation on how store digraphs? should go different data type altogether? thanks. i not sure understand concern. fact digraph stored in ets transparent in user interface, might want chnge either exchange digr...
Read more