java - Bean instantiation via constructor failed; nested exception is org.springframework.beans.BeanInstantiationException -


i new spring , please can resolve exception.

exception :

exception in thread "main" org.springframework.beans.factory.beancreationexception: error creating bean name 'entitydao' defined in class path resource [springapp-servlet.xml]: cannot resolve reference bean 'configdetails' while setting bean property 'configdetails'; nested exception org.springframework.beans.factory.beancreationexception: error creating bean name 'configdetails' defined in class path resource [springapp-servlet.xml]: bean instantiation via constructor failed; nested exception org.springframework.beans.beaninstantiationexception: failed instantiate [com.taphius.databridge.deserializer.datasourcerconfigdetails]: constructor threw exception; nested exception java.lang.noclassdeffounderror: com/google/gson/gsonbuilder

this main class

public class mainapp {      final static logger logger = logger.getlogger(mainapp.class);     public static string flume_conf_dir = "";      public static void main(string[] args) {          new classpathxmlapplicationcontext("springapp-servlet.xml");         logger.info("application context loaded successfully.");     }  }

springapp-servlet.xml

<?xml version="1.0" encoding="utf-8"?>  <beans xmlns="http://www.springframework.org/schema/beans"     xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xmlns:task="http://www.springframework.org/schema/task"     xsi:schemalocation="http://www.springframework.org/schema/beans        http://www.springframework.org/schema/beans/spring-beans-4.3.xsd         http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.3.xsd">      <!-- application context definition springapp dispatcherservlet -->      <task:annotation-driven />      <bean id="entitydao" class="com.taphius.databridge.dao.entitydefinationdao">         <property name="configdetails" ref="configdetails" />     </bean>       <bean id="configdetails"         class="com.taphius.databridge.deserializer.datasourcerconfigdetails">         <constructor-arg>             <value type="java.lang.class">com.taphius.databridge.model.datasourcerattributes             </value>         </constructor-arg>     </bean>      <bean id="datachecker" class="com.taphius.datachecker.filechecker"         init-method="init">         <property name="entitydao" ref="entitydao" />     </bean>      <bean id="notifychecker" class="com.taphius.pipeline.notification.pipelinenotifywatcher"         init-method="init">         <property name="datachecker" ref="datachecker" />     </bean>      <bean id="scheduledjob" class="com.taphius.databridge.scheduler.scheduleddbpoller">         <property name="task" ref="task" />     </bean>       <bean id="task" class="com.taphius.databridge.scheduler.customtask">         <property name="entity" ref="entitydao" />         <property name="datachecker" ref="datachecker" />     </bean>      <bean name="runmejob"         class="org.springframework.scheduling.quartz.jobdetailfactorybean">          <property name="jobclass"             value="com.taphius.databridge.scheduler.scheduleddbpoller" />          <property name="jobdataasmap">             <map>                 <entry key="task" value-ref="task" />             </map>         </property>                 <property name="durability" value="true"></property>      </bean>     <!-- cron trigger, run every 5 minutes -->      <bean id="crontrigger"         class="org.springframework.scheduling.quartz.crontriggerfactorybean">          <property name="jobdetail" ref="runmejob" />         <property name="cronexpression" value="0 0/2 * * * ?" />      </bean>      <bean class="org.springframework.scheduling.quartz.schedulerfactorybean">         <property name="jobdetails">             <list>                 <ref bean="runmejob" />             </list>         </property>          <property name="triggers">             <list>                 <ref bean="crontrigger" />             </list>         </property>      </bean>   </beans>

you misss jar containing class com/google/gson/gsonbuilder in classpath. add following dependency pom.xml:

<dependency>     <groupid>com.google.code.gson</groupid>     <artifactid>gson</artifactid>     <version>2.8.1</version> </dependency>

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