Caused by: java.lang.NoClassDefFoundError: net/sf/ehcache/CacheException

I am getting the following exception. Please let me know what am I missing? Thanks in advance.

Caused by: java.lang.NoClassDefFoundError: net/sf/ehcache/CacheException
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)
at java.lang.Class.getConstructor0(Class.java:2699)
at java.lang.Class.getDeclaredConstructor(Class.java:1985)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:54)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:757)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:722)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:386)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:249)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:155)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:246)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:160)
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:267)
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:110)

nested exception is java.lang.IllegalStateException: Cannot create command without commandClass

I am getting following exception while using AbstractCommandController in spring framework.

The server encountered an internal error () that prevented it from fulfilling this request.
exception org.springframework.web.util.NestedServletException: Request processing
failed; nested exception is java.lang.IllegalStateException: Cannot create command without commandClass
being set - either set commandClass or (in a form controller) override formBackingObject
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:488)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:441)
javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:265)
org.acegisecurity.intercept.web.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:107)
org.acegisecurity.intercept.web.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:72)
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:110)
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)

Please help me in resolving this exception. Thanks in advance.

nested exception is java.lang.NoClassDefFoundError: net/sf/ezmorph/Morpher

I am getting following exception while deploying a web spring based application in tomcat 6.0.

nested exception is java.lang.NoClassDefFoundError: net/sf/ezmorph/Morpher
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:899)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:793)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:476)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:441)
javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:265)

java.lang.ClassNotFoundException: org.springframework.web.context.ContextLoaderListener

I am getting following exception while deploying spring framework based application in tomcat. Please let me know what is missing.
SEVERE: Error configuring application listener of class

<br>
org.springframework.web.context.ContextLoaderListener<br>
java.lang.ClassNotFoundException: org.springframework.web.context.ContextLoaderListener<br>
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1358)<br>
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1204)<br>
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3773)<br>
	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4337)<br>
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)<br>
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)<br>
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:525)<br>
	at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:626)<br>
	at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:553)<br>
	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:488)<br>

Implement a stack?

A stack is an ordered list in which all insertions and deletions are made at one end, called the top. We can picture a stack as in the following figure.
Stack
The last element inserted is the first element deleted. Thus E is deleted before D because E was inserted after D. For this reason a stack is sometime called last-in, first-out (LIFO). Implementation of stack in Java

public class MyStack extends Vector {
/**
* Constructor creates an empty stack
*/
public MyStack() {
}

/**
* Pushes an Object onto the top of the stack
*/
public Object push(Object item) {
addElement(item);
return item;
}

/**
* Pops an item from the stack and returns it.  The item popped is
* removed from the Stack.
*/
public Object pop() {
if (isEmpty()) {
throw new EmptyStackException();
}
Object item = elementData[--elementCount];
// Release memory used by this element
elementData[elementCount] = null;
return item;
}

/**
* Returns the top Object on the stack without removing it.
*/
public Object peek() {
if (isEmpty()) {
throw new EmptyStackException();
}
return elementData[elementCount - 1];
}

/**
* Check if the stack is empty.
*/
public boolean isEmpty() {
return elementCount == 0;
}
}

org.springframework.web.context.ContextLoader – Context initialization failed

I am getting following exception while starting tomcat. Application context is not loaded after the error. I am using spring framework.

2008-07-02 17:55:19,484 [main] ERROR org.springframework.web.context.ContextLoader - Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'testController' defined in ServletContext resource [/WEB-INF/servlet.xml]: Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'callCenterService': Bean with name 'callCenterService' has been injected into other beans [centerAccessService] in its raw version as part of a circular reference, but has eventually been wrapped (for example as part of auto-proxy creation). This means that said other beans do not use the final version of the bean. This is often the result of over-eager type matching - consider using 'getBeanNamesOfType' with the 'allowEagerInit' flag turned off, for example.
Caused by:
org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'testService': Bean with name 'testService' has been injected into other beans [testAccessService] in its raw version as part of a circular reference, but has eventually been wrapped (for example as part of auto-proxy creation). This means that said other beans do not use the final version of the bean. This is often the result of over-eager type matching - consider using 'getBeanNamesOfType' with the 'allowEagerInit' flag turned off, for example.
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:431)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:249)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:155)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:246)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:160)

What could be possible reason for this exception?

java.lang.ClassNotFoundException: com.mysql.jdbc.Driver

I am getting following exception while connecting to mysql. Please let me know where am I wrong? Thank in advance.

java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at MySqlTest.main(MySqlTest.java:18)

javax.servlet.ServletException: javax.naming.NameNotFoundException: Name comp is not bound in this Context

I am getting following exception while connecting to a database in spring framework.
Stacktrace:

org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:524)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:417)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)root cause
javax.servlet.ServletException: javax.naming.NameNotFoundException: Name comp is not bound in this Context
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:850)

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