org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.beans.factory.config.PropertyPlaceholderConfigurer#0': Initialization of bean failed; nested exception is java.lang.IllegalArgumentException: Method must not be null

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Error creating bean with name 'org.springframework.beans.factory.config.PropertyPlaceholderConfigurer#0': Initialization of bean failed; nested exception is java.lang.IllegalArgumentException: Method must not be null
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Error creating bean with name 'org.springframework.beans.factory.config.PropertyPlaceholderConfigurer#0': Initialization of bean failed; nested exception is java.lang.IllegalArgumentException: Class must not be null
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Error creating bean with name 'org.springframework.beans.factory.config.PropertyPlaceholderConfigurer#0': Initialization of bean failed; nested exception is java.lang.NullPointerException
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.beans.factory.config.PropertyPlaceholderConfigurer#0': Initialization of bean failed; nested exception is java.lang.IllegalArgumentException: Method must not be null	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:480)	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)	at java.security.AccessController.doPrivileged(Native Method)	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:264)	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:261)	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:515)	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:362)	at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:255)	at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:199)	at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:45)	at org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java:530)	at org.mortbay.jetty.servlet.Context.startContext(Context.java:135)	at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1218)	at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:500)	at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:448)	at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40)	at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:147)	at org.mortbay.jetty.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:161)	at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40)	at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:147)	at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40)	at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:117)	at org.mortbay.jetty.Server.doStart(Server.java:210)	at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40)	at org.mortbay.xml.XmlConfiguration.main(XmlConfiguration.java:929)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.mortbay.start.Main.invokeMain(Main.java:183)	at org.mortbay.start.Main.start(Main.java:497)	at org.mortbay.start.Main.main(Main.java:115)Caused by: java.lang.IllegalArgumentException: Method must not be null	at org.springframework.util.Assert.notNull(Assert.java:112)	at org.springframework.core.BridgeMethodResolver.findBridgedMethod(BridgeMethodResolver.java:63)	at org.springframework.beans.GenericTypeAwarePropertyDescriptor.<init>(GenericTypeAwarePropertyDescriptor.java:58)	at org.springframework.beans.CachedIntrospectionResults.<init>(CachedIntrospectionResults.java:250)	at org.springframework.beans.CachedIntrospectionResults.forClass(CachedIntrospectionResults.java:144)	at org.springframework.beans.BeanWrapperImpl.getCachedIntrospectionResults(BeanWrapperImpl.java:252)	at org.springframework.beans.BeanWrapperImpl.getPropertyDescriptorInternal(BeanWrapperImpl.java:282)	at org.springframework.beans.BeanWrapperImpl.isWritableProperty(BeanWrapperImpl.java:333)	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1247)	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1010)	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:472)	... 35 more