Hello. I've made AjaxHadler:

Code:
package springapp.ajaxService;

import java.util.HashMap;
import java.util.Map;
import org.springmodules.xt.ajax.AbstractAjaxHandler;
import org.springmodules.xt.ajax.AjaxActionEvent;
import org.springmodules.xt.ajax.AjaxResponse;
import org.springmodules.xt.ajax.AjaxResponseImpl;
import org.springmodules.xt.ajax.action.ExecuteJavascriptFunctionAction;

public class CalculationHandler extends AbstractAjaxHandler {

    public AjaxResponse executeCalculation(AjaxActionEvent event) {
        Map<String, Object> options = new HashMap<String, Object>();
        options.put("message", "Greetings!");
        
        // Create an ajax action for executing a Javascript function: 
        ExecuteJavascriptFunctionAction action = new ExecuteJavascriptFunctionAction("showAlert", options);
        
        // Create a concrete ajax response:
        AjaxResponse response = new AjaxResponseImpl();
        // Add the action:
        response.addAction(action);
        
        return response;
    }
    
}
I add this bean to my servlet dispatcher:

Code:
    <bean id="CalculationHandler" class="springapp.ajaxService.CalculationHandler"/>
And this causes an exception:

Code:
exception

javax.servlet.ServletException: Servlet.init() for servlet springapp threw exception
	org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
	org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
	org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)
	org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
	org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
	org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
	org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
	java.lang.Thread.run(Unknown Source)

root cause

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'CalculationHandler' defined in ServletContext resource [/WEB-INF/springapp-servlet.xml]: Instantiation of bean failed; nested exception is java.lang.NoClassDefFoundError: Could not initialize class springapp.ajaxService.CalculationHandler
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:883)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:839)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:440)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)
	java.security.AccessController.doPrivileged(Native Method)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
	org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:264)
	org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
	org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:261)
	org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)
	org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
	org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:429)
	org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:728)
	org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:380)
	org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:402)
	org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:316)
	org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:282)
	org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:126)
	javax.servlet.GenericServlet.init(GenericServlet.java:212)
	org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
	org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
	org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)
	org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
	org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
	org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
	org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
	java.lang.Thread.run(Unknown Source)

root cause

java.lang.NoClassDefFoundError: Could not initialize class springapp.ajaxService.CalculationHandler
	sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
	sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
	java.lang.reflect.Constructor.newInstance(Unknown Source)
	org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:100)
	org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:61)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:877)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:839)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:440)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)
	java.security.AccessController.doPrivileged(Native Method)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
	org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:264)
	org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
	org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:261)
	org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)
	org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
	org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:429)
	org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:728)
	org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:380)
	org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:402)
	org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:316)
	org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:282)
	org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:126)
	javax.servlet.GenericServlet.init(GenericServlet.java:212)
	org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
	org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
	org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)
	org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
	org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
	org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
	org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
	java.lang.Thread.run(Unknown Source)
Looks like tomcat unable to initalize my class. So what am doing wrong?