本文分析了一个在Spring应用中使用C3P0数据源时遇到的Bean创建异常。问题根源可能是jar库冲突导致的，解决办法是检查并删除冲突的jar包。异常堆栈信息显示了在尝试实例化 ComboPooledDataSource 时抛出了 ExceptionInInitializerError，进一步深入到库内部，发现是由于找不到特定方法导致的NoSuchMethodError。
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
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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
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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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