maven Spring 4.2+SpringMVC+dubbo解决TypeProxyInvocationHandler.invoke(SerializableTypeWrapper.java:239)

java.lang.NullPointerException
org.springframework.core.SerializableTypeWrapper$TypeProxyInvocationHandler.invoke(SerializableTypeWrapper.java:239)
org.springframework.core.$Proxy5.hashCode(Unknown Source)
org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:273)
org.springframework.core.ResolvableType.hashCode(ResolvableType.java:811)
org.springframework.util.ConcurrentReferenceHashMap.getHash(ConcurrentReferenceHashMap.java:214)
org.springframework.util.ConcurrentReferenceHashMap.getReference(ConcurrentReferenceHashMap.java:246)
org.springframework.util.ConcurrentReferenceHashMap.get(ConcurrentReferenceHashMap.java:226)
org.springframework.core.ResolvableType.forType(ResolvableType.java:1186)
org.springframework.core.ResolvableType.forType(ResolvableType.java:1165)
org.springframework.core.ResolvableType.forTypes(ResolvableType.java:844)
org.springframework.core.ResolvableType.getInterfaces(ResolvableType.java:403)
org.springframework.core.ResolvableType.as(ResolvableType.java:365)
org.springframework.core.convert.support.GenericConversionService.getRequiredTypeInfo(GenericConversionService.java:266)
org.springframework.core.convert.support.GenericConversionService.addConverterFactory(GenericConversionService.java:103)
org.springframework.core.convert.support.DefaultConversionService.addScalarConverters(DefaultConversionService.java:79)
org.springframework.core.convert.support.DefaultConversionService.addDefaultConverters(DefaultConversionService.java:63)
org.springframework.core.convert.support.DefaultConversionService.<init>(DefaultConversionService.java:50)
org.springframework.core.env.AbstractPropertyResolver.<init>(AbstractPropertyResolver.java:41)
org.springframework.core.env.PropertySourcesPropertyResolver.<init>(PropertySourcesPropertyResolver.java:41)
org.springframework.core.env.AbstractEnvironment.<init>(AbstractEnvironment.java:112)
org.springframework.core.env.StandardEnvironment.<init>(StandardEnvironment.java:54)
org.springframework.web.context.support.StandardServletEnvironment.<init>(StandardServletEnvironment.java:44)
org.springframework.web.servlet.HttpServletBean.createEnvironment(HttpServletBean.java:215)
org.springframework.web.servlet.HttpServletBean.getEnvironment(HttpServletBean.java:205)
org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:126)
javax.servlet.GenericServlet.init(GenericServlet.java:160)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
java.lang.Thread.run(Thread.java:745)

解决：maven的传递依赖导致spring 4.2与spring 2.5包冲突

		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>dubbo</artifactId>
			<version>2.5.3</version>
			<exclusions>
				<exclusion>
					<artifactId>spring</artifactId>
					<groupId>org.springframework</groupId>
				</exclusion>
			</exclusions>
		</dependency>