Error creating bean with name ‘dataSource‘ defined in class path resource [applicationContext.xml]
本文共 20471 字，大约阅读时间需要 68 分钟。
分析：异常信息提示错误出在C3P0连接池，检查applicationContext.xml后发现并没有什么错误，于是我们可以锁定问题出在 jar 库依赖，问题的出现可能就是 jar 库冲突，选择性地删掉一个就OK了。
严重: 在路径为[/SSH02-SpringWebPojo]的上下文中，servlet[servlets.RegisterServlet]的Servlet.service()引发异常
org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘dataSource’ defined in class path resource [applicationContext.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.mchange.v2.c3p0.ComboPooledDataSource]: Constructor threw exception; nested exception is java.lang.ExceptionInInitializerError at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1105) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1050) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) at org.springframework.beans.factory.support.AbstractBeanFactory 1. g e t O b j e c t ( A b s t r a c t B e a n F a c t o r y . j a v a : 306 ) a t o r g . s p r i n g f r a m e w o r k . b e a n s . f a c t o r y . s u p p o r t . D e f a u l t S i n g l e t o n B e a n R e g i s t r y . g e t S i n g l e t o n ( D e f a u l t S i n g l e t o n B e a n R e g i s t r y . j a v a : 230 ) a t o r g . s p r i n g f r a m e w o r k . b e a n s . f a c t o r y . s u p p o r t . A b s t r a c t B e a n F a c t o r y . d o G e t B e a n ( A b s t r a c t B e a n F a c t o r y . j a v a : 302 ) a t o r g . s p r i n g f r a m e w o r k . b e a n s . f a c t o r y . s u p p o r t . A b s t r a c t B e a n F a c t o r y . g e t B e a n ( A b s t r a c t B e a n F a c t o r y . j a v a : 197 ) a t o r g . s p r i n g f r a m e w o r k . b e a n s . f a c t o r y . s u p p o r t . D e f a u l t L i s t a b l e B e a n F a c t o r y . p r e I n s t a n t i a t e S i n g l e t o n s ( D e f a u l t L i s t a b l e B e a n F a c t o r y . j a v a : 776 ) a t o r g . s p r i n g f r a m e w o r k . c o n t e x t . s u p p o r t . A b s t r a c t A p p l i c a t i o n C o n t e x t . f i n i s h B e a n F a c t o r y I n i t i a l i z a t i o n ( A b s t r a c t A p p l i c a t i o n C o n t e x t . j a v a : 861 ) a t o r g . s p r i n g f r a m e w o r k . c o n t e x t . s u p p o r t . A b s t r a c t A p p l i c a t i o n C o n t e x t . r e f r e s h ( A b s t r a c t A p p l i c a t i o n C o n t e x t . j a v a : 541 ) a t o r g . s p r i n g f r a m e w o r k . c o n t e x t . s u p p o r t . C l a s s P a t h X m l A p p l i c a t i o n C o n t e x t . < i n i t > ( C l a s s P a t h X m l A p p l i c a t i o n C o n t e x t . j a v a : 139 ) a t o r g . s p r i n g f r a m e w o r k . c o n t e x t . s u p p o r t . C l a s s P a t h X m l A p p l i c a t i o n C o n t e x t . < i n i t > ( C l a s s P a t h X m l A p p l i c a t i o n C o n t e x t . j a v a : 83 ) a t s e r v l e t s . R e g i s t e r S e r v l e t . d o G e t ( R e g i s t e r S e r v l e t . j a v a : 35 ) a t s e r v l e t s . R e g i s t e r S e r v l e t . d o P o s t ( R e g i s t e r S e r v l e t . j a v a : 46 ) a t j a v a x . s e r v l e t . h t t p . H t t p S e r v l e t . s e r v i c e ( H t t p S e r v l e t . j a v a : 652 ) a t j a v a x . s e r v l e t . h t t p . H t t p S e r v l e t . s e r v i c e ( H t t p S e r v l e t . j a v a : 733 ) a t o r g . a p a c h e . c a t a l i n a . c o r e . A p p l i c a t i o n F i l t e r C h a i n . i n t e r n a l D o F i l t e r ( A p p l i c a t i o n F i l t e r C h a i n . j a v a : 231 ) a t o r g . a p a c h e . c a t a l i n a . c o r e . A p p l i c a t i o n F i l t e r C h a i n . d o F i l t e r ( A p p l i c a t i o n F i l t e r C h a i n . j a v a : 166 ) a t o r g . a p a c h e . t o m c a t . w e b s o c k e t . s e r v e r . W s F i l t e r . d o F i l t e r ( W s F i l t e r . j a v a : 53 ) a t o r g . a p a c h e . c a t a l i n a . c o r e . A p p l i c a t i o n F i l t e r C h a i n . i n t e r n a l D o F i l t e r ( A p p l i c a t i o n F i l t e r C h a i n . j a v a : 193 ) a t o r g . a p a c h e . c a t a l i n a . c o r e . A p p l i c a t i o n F i l t e r C h a i n . d o F i l t e r ( A p p l i c a t i o n F i l t e r C h a i n . j a v a : 166 ) a t o r g . a p a c h e . c a t a l i n a . c o r e . S t a n d a r d W r a p p e r V a l v e . i n v o k e ( S t a n d a r d W r a p p e r V a l v e . j a v a : 202 ) a t o r g . a p a c h e . c a t a l i n a . c o r e . S t a n d a r d C o n t e x t V a l v e . i n v o k e ( S t a n d a r d C o n t e x t V a l v e . j a v a : 96 ) a t o r g . a p a c h e . c a t a l i n a . a u t h e n t i c a t o r . A u t h e n t i c a t o r B a s e . i n v o k e ( A u t h e n t i c a t o r B a s e . j a v a : 541 ) a t o r g . a p a c h e . c a t a l i n a . c o r e . S t a n d a r d H o s t V a l v e . i n v o k e ( S t a n d a r d H o s t V a l v e . j a v a : 139 ) a t o r g . a p a c h e . c a t a l i n a . v a l v e s . E r r o r R e p o r t V a l v e . i n v o k e ( E r r o r R e p o r t V a l v e . j a v a : 92 ) a t o r g . a p a c h e . c a t a l i n a . v a l v e s . A b s t r a c t A c c e s s L o g V a l v e . i n v o k e ( A b s t r a c t A c c e s s L o g V a l v e . j a v a : 690 ) a t o r g . a p a c h e . c a t a l i n a . c o r e . S t a n d a r d E n g i n e V a l v e . i n v o k e ( S t a n d a r d E n g i n e V a l v e . j a v a : 74 ) a t o r g . a p a c h e . c a t a l i n a . c o n n e c t o r . C o y o t e A d a p t e r . s e r v i c e ( C o y o t e A d a p t e r . j a v a : 343 ) a t o r g . a p a c h e . c o y o t e . h t t p 11. H t t p 11 P r o c e s s o r . s e r v i c e ( H t t p 11 P r o c e s s o r . j a v a : 373 ) a t o r g . a p a c h e . c o y o t e . A b s t r a c t P r o c e s s o r L i g h t . p r o c e s s ( A b s t r a c t P r o c e s s o r L i g h t . j a v a : 65 ) a t o r g . a p a c h e . c o y o t e . A b s t r a c t P r o t o c o l 1.getObject(AbstractBeanFactory.java:306) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:776) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:861) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541) at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139) at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83) at servlets.RegisterServlet.doGet(RegisterServlet.java:35) at servlets.RegisterServlet.doPost(RegisterServlet.java:46) at javax.servlet.http.HttpServlet.service(HttpServlet.java:652) at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) at org.apache.coyote.AbstractProtocol 1.getObject(AbstractBeanFactory.java:306)atorg.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)atorg.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)atorg.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)atorg.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:776)atorg.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:861)atorg.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541)atorg.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)atorg.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)atservlets.RegisterServlet.doGet(RegisterServlet.java:35)atservlets.RegisterServlet.doPost(RegisterServlet.java:46)atjavax.servlet.http.HttpServlet.service(HttpServlet.java:652)atjavax.servlet.http.HttpServlet.service(HttpServlet.java:733)atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)atorg.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)atorg.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)atorg.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)atorg.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)atorg.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)atorg.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)atorg.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690)atorg.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)atorg.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)atorg.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373)atorg.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)atorg.apache.coyote.AbstractProtocolConnectionHandler.process(AbstractProtocol.java:868) at org.apache.tomcat.util.net.NioEndpoint S o c k e t P r o c e s s o r . d o R u n ( N i o E n d p o i n t . j a v a : 1589 ) a t o r g . a p a c h e . t o m c a t . u t i l . n e t . S o c k e t P r o c e s s o r B a s e . r u n ( S o c k e t P r o c e s s o r B a s e . j a v a : 49 ) a t j a v a . u t i l . c o n c u r r e n t . T h r e a d P o o l E x e c u t o r . r u n W o r k e r ( U n k n o w n S o u r c e ) a t j a v a . u t i l . c o n c u r r e n t . T h r e a d P o o l E x e c u t o r SocketProcessor.doRun(NioEndpoint.java:1589) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor SocketProcessor.doRun(NioEndpoint.java:1589)atorg.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)atjava.util.concurrent.ThreadPoolExecutor.runWorker(UnknownSource)atjava.util.concurrent.ThreadPoolExecutorWorker.run(Unknown Source) at org.apache.tomcat.util.threads.TaskThread W r a p p i n g R u n n a b l e . r u n ( T a s k T h r e a d . j a v a : 61 ) a t j a v a . l a n g . T h r e a d . r u n ( U n k n o w n S o u r c e ) C a u s e d b y : o r g . s p r i n g f r a m e w o r k . b e a n s . B e a n I n s t a n t i a t i o n E x c e p t i o n : F a i l e d t o i n s t a n t i a t e [ c o m . m c h a n g e . v 2. c 3 p 0. C o m b o P o o l e d D a t a S o u r c e ] : C o n s t r u c t o r t h r e w e x c e p t i o n ; n e s t e d e x c e p t i o n i s j a v a . l a n g . E x c e p t i o n I n I n i t i a l i z e r E r r o r a t o r g . s p r i n g f r a m e w o r k . b e a n s . B e a n U t i l s . i n s t a n t i a t e C l a s s ( B e a n U t i l s . j a v a : 154 ) a t o r g . s p r i n g f r a m e w o r k . b e a n s . f a c t o r y . s u p p o r t . S i m p l e I n s t a n t i a t i o n S t r a t e g y . i n s t a n t i a t e ( S i m p l e I n s t a n t i a t i o n S t r a t e g y . j a v a : 89 ) a t o r g . s p r i n g f r a m e w o r k . b e a n s . f a c t o r y . s u p p o r t . A b s t r a c t A u t o w i r e C a p a b l e B e a n F a c t o r y . i n s t a n t i a t e B e a n ( A b s t r a c t A u t o w i r e C a p a b l e B e a n F a c t o r y . j a v a : 1098 ) . . . 38 m o r e C a u s e d b y : j a v a . l a n g . E x c e p t i o n I n I n i t i a l i z e r E r r o r a t c o m . m c h a n g e . v 2. c 3 p 0. i m p l . P o o l B a c k e d D a t a S o u r c e B a s e . < i n i t > ( P o o l B a c k e d D a t a S o u r c e B a s e . j a v a : 54 ) a t c o m . m c h a n g e . v 2. c 3 p 0. i m p l . A b s t r a c t P o o l B a c k e d D a t a S o u r c e . < i n i t > ( A b s t r a c t P o o l B a c k e d D a t a S o u r c e . j a v a : 74 ) a t c o m . m c h a n g e . v 2. c 3 p 0. A b s t r a c t C o m b o P o o l e d D a t a S o u r c e . < i n i t > ( A b s t r a c t C o m b o P o o l e d D a t a S o u r c e . j a v a : 142 ) a t c o m . m c h a n g e . v 2. c 3 p 0. A b s t r a c t C o m b o P o o l e d D a t a S o u r c e . < i n i t > ( A b s t r a c t C o m b o P o o l e d D a t a S o u r c e . j a v a : 138 ) a t c o m . m c h a n g e . v 2. c 3 p 0. C o m b o P o o l e d D a t a S o u r c e . < i n i t > ( C o m b o P o o l e d D a t a S o u r c e . j a v a : 47 ) a t s u n . r e f l e c t . N a t i v e C o n s t r u c t o r A c c e s s o r I m p l . n e w I n s t a n c e 0 ( N a t i v e M e t h o d ) a t s u n . r e f l e c t . N a t i v e C o n s t r u c t o r A c c e s s o r I m p l . n e w I n s t a n c e ( U n k n o w n S o u r c e ) a t s u n . r e f l e c t . D e l e g a t i n g C o n s t r u c t o r A c c e s s o r I m p l . n e w I n s t a n c e ( U n k n o w n S o u r c e ) a t j a v a . l a n g . r e f l e c t . C o n s t r u c t o r . n e w I n s t a n c e ( U n k n o w n S o u r c e ) a t o r g . s p r i n g f r a m e w o r k . b e a n s . B e a n U t i l s . i n s t a n t i a t e C l a s s ( B e a n U t i l s . j a v a : 142 ) . . . 40 m o r e C a u s e d b y : j a v a . l a n g . r e f l e c t . U n d e c l a r e d T h r o w a b l e E x c e p t i o n a t c o m . s u n . p r o x y . WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Unknown Source) Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.mchange.v2.c3p0.ComboPooledDataSource]: Constructor threw exception; nested exception is java.lang.ExceptionInInitializerError at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:154) at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:89) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1098) ... 38 more Caused by: java.lang.ExceptionInInitializerError at com.mchange.v2.c3p0.impl.PoolBackedDataSourceBase.<init>(PoolBackedDataSourceBase.java:54) at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.<init>(AbstractPoolBackedDataSource.java:74) at com.mchange.v2.c3p0.AbstractComboPooledDataSource.<init>(AbstractComboPooledDataSource.java:142) at com.mchange.v2.c3p0.AbstractComboPooledDataSource.<init>(AbstractComboPooledDataSource.java:138) at com.mchange.v2.c3p0.ComboPooledDataSource.<init>(ComboPooledDataSource.java:47) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) at java.lang.reflect.Constructor.newInstance(Unknown Source) at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:142) ... 40 more Caused by: java.lang.reflect.UndeclaredThrowableException at com.sun.proxy. WrappingRunnable.run(TaskThread.java:61)atjava.lang.Thread.run(UnknownSource)Causedby:org.springframework.beans.BeanInstantiationException:Failedtoinstantiate[com.mchange.v2.c3p0.ComboPooledDataSource]:Constructorthrewexception;nestedexceptionisjava.lang.ExceptionInInitializerErroratorg.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:154)atorg.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:89)atorg.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1098)...38moreCausedby:java.lang.ExceptionInInitializerErroratcom.mchange.v2.c3p0.impl.PoolBackedDataSourceBase.<init>(PoolBackedDataSourceBase.java:54)atcom.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.<init>(AbstractPoolBackedDataSource.java:74)atcom.mchange.v2.c3p0.AbstractComboPooledDataSource.<init>(AbstractComboPooledDataSource.java:142)atcom.mchange.v2.c3p0.AbstractComboPooledDataSource.<init>(AbstractComboPooledDataSource.java:138)atcom.mchange.v2.c3p0.ComboPooledDataSource.<init>(ComboPooledDataSource.java:47)atsun.reflect.NativeConstructorAccessorImpl.newInstance0(NativeMethod)atsun.reflect.NativeConstructorAccessorImpl.newInstance(UnknownSource)atsun.reflect.DelegatingConstructorAccessorImpl.newInstance(UnknownSource)atjava.lang.reflect.Constructor.newInstance(UnknownSource)atorg.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:142)...40moreCausedby:java.lang.reflect.UndeclaredThrowableExceptionatcom.sun.proxy.Proxy12.find(Unknown Source) at com.mchange.v2.cfg.MConfig.readVmConfig(MConfig.java:75) at com.mchange.v2.c3p0.cfg.C3P0Config.findLibraryMultiPropertiesConfig(C3P0Config.java:157) at com.mchange.v2.c3p0.cfg.C3P0Config.(C3P0Config.java:143) … 50 more Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at com.mchange.v1.lang.Synchronizer 1. i n v o k e ( S y n c h r o n i z e r . j a v a : 58 ) . . . 54 m o r e C a u s e d b y : j a v a . l a n g . N o S u c h M e t h o d E r r o r : c o m . m c h a n g e . v 2. c f g . B a s i c M u l t i P r o p e r t i e s C o n f i g . < i n i t > ( [ L j a v a / l a n g / S t r i n g ; L j a v a / u t i l / L i s t ; ) V a t c o m . m c h a n g e . v 2. c f g . C o n f i g U t i l s . r e a d ( C o n f i g U t i l s . j a v a : 63 ) a t c o m . m c h a n g e . v 2. c f g . M C o n f i g 1.invoke(Synchronizer.java:58) ... 54 more Caused by: java.lang.NoSuchMethodError: com.mchange.v2.cfg.BasicMultiPropertiesConfig.<init>([Ljava/lang/String;Ljava/util/List;)V at com.mchange.v2.cfg.ConfigUtils.read(ConfigUtils.java:63) at com.mchange.v2.cfg.MConfig 1.invoke(Synchronizer.java:58)...54moreCausedby:java.lang.NoSuchMethodError:com.mchange.v2.cfg.BasicMultiPropertiesConfig.<init>([Ljava/lang/String;Ljava/util/List;)Vatcom.mchange.v2.cfg.ConfigUtils.read(ConfigUtils.java:63)atcom.mchange.v2.cfg.MConfigCSManager.recreateFromKey(MConfig.java:153) at com.mchange.v1.cachedstore.NoCleanupCachedStore.find(NoCleanupCachedStore.java:63) … 59 more
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东北赛选拔教训
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hash
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涨姿势了：求两个分子的最大公倍数
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快速幂
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vector.reserve and resize &&vector与map结合
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最长公共子序列
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计算几何
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求解方程
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太弱了。。水题
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位运算（含应用）
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野指针与空指针
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图文混排效果
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