Java异常大体分两类：RuntimeException，其他；注意：两类异常都是在程序运行期间出现！只不过后者必须在编译期间进行处理，一般是try catch或throw；程序期间出现了此类异常时会执行catch和finally语句。而RuntimeException不必明确指出处理方式，大概更底层的虚拟机里有处理过程吧（这个我瞎猜的）。
1，NoClassDefFoundError
首先可以肯定的一点是，这不是ClassNotFoundException；JDK文档对NoClassDefFoundError的描述是
Thrown if the Java Virtual Machine or a ClassLoader instance tries to load in the
definition of a class (as part of a normal method call or as part of creating a new
instance using the new expression) and no definition of the class could be found.
The searched-for class definition existed when the currently executing class was compiled,
but the definition can no longer be found.直接点就是编译通过了，但是运行时，JVM或者类加载器想要加载类却找不到这个类。
解决BeanCreationException的办法：百度了半天解决不了，Bing搜索一下就出来了。以前只是听说Bing好用，今天算是体会到了。
2java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
缺少commons-logging.jar包
NoClassDefFoundError: org/apache/commons/httpclient/HttpMethod
原因：缺少commons-httpclient-3.0.jar
3、Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.Log
原因：缺少commons-logging.jar包
四月 02, 2017 12:33:51 下午 org.apache.tomcat.util.digester.SetPropertiesRule begin
警告: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:YSDelivery' did not find a matching property.
四月 02, 2017 12:33:51 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: Server version: Apache Tomcat/9.0.0.M17
四月 02, 2017 12:33:51 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: Server built: Jan 10 2017 20:59:20 UTC
四月 02, 2017 12:33:51 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: Server number: 9.0.0.0
四月 02, 2017 12:33:51 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: OS Name: Windows 8
四月 02, 2017 12:33:51 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: OS Version: 6.2
四月 02, 2017 12:33:51 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: Architecture: amd64
四月 02, 2017 12:33:51 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: Java Home: C:Program FilesJavajre1.8.0_121
四月 02, 2017 12:33:51 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: JVM Version: 1.8.0_121-b13
四月 02, 2017 12:33:51 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: JVM Vendor: Oracle Corporation
四月 02, 2017 12:33:51 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: CATALINA_BASE: E:CodingIDEServerapache-tomcat-9.0.0.M17
四月 02, 2017 12:33:51 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: CATALINA_HOME: E:CodingIDEServerapache-tomcat-9.0.0.M17
四月 02, 2017 12:33:51 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: Command line argument: -Dcatalina.base=E:CodingIDEServerapache-tomcat-9.0.0.M17
四月 02, 2017 12:33:51 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: Command line argument: -Dcatalina.home=E:CodingIDEServerapache-tomcat-9.0.0.M17
四月 02, 2017 12:33:51 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: Command line argument: -Dwtp.deploy=E:CodingIDEServerapache-tomcat-9.0.0.M17wtpwebapps
四月 02, 2017 12:33:51 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: Command line argument: -Djava.endorsed.dirs=E:CodingIDEServerapache-tomcat-9.0.0.M17endorsed
四月 02, 2017 12:33:51 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: Command line argument: -Dfile.encoding=GBK
四月 02, 2017 12:33:51 下午 org.apache.catalina.core.AprLifecycleListener lifecycleEvent
信息: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:Program FilesJavajre1.8.0_121in;C:WindowsSunJavain;C:Windowssystem32;C:Windows;C:/Program Files/Java/jre1.8.0_121/bin/server;C:/Program Files/Java/jre1.8.0_121/bin;C:/Program Files/Java/jre1.8.0_121/lib/amd64;E:CodingIDEPython36Scripts;E:CodingIDEPython36;E:CodingIDEDataBaseoraclexeapporacleproduct11.2.0serverin;;C:ProgramDataOracleJavajavapath;C:Windowssystem32;C:Windows;C:WindowsSystem32Wbem;C:WindowsSystem32WindowsPowerShellv1.0;C:Program FilesJavajdk1.8.0_121in;C:Program FilesJavajdk1.8.0_121jrein;E:CodingIDEDataBasemysql-5.7.17-winx64in;E:CodingIDE
ode-v6.10.1-win-x64;E:CodingIDEeclipse-jee-neon-3-RC3-win32-x86_64eclipse;;.
四月 02, 2017 12:33:51 下午 org.apache.coyote.AbstractProtocol init
信息: Initializing ProtocolHandler ["http-nio-8080"]
四月 02, 2017 12:33:52 下午 org.apache.tomcat.util.net.NioSelectorPool getSharedSelector
信息: Using a shared selector for servlet write/read
四月 02, 2017 12:33:52 下午 org.apache.coyote.AbstractProtocol init
信息: Initializing ProtocolHandler ["ajp-nio-8009"]
四月 02, 2017 12:33:52 下午 org.apache.tomcat.util.net.NioSelectorPool getSharedSelector
信息: Using a shared selector for servlet write/read
四月 02, 2017 12:33:52 下午 org.apache.catalina.startup.Catalina load
信息: Initialization processed in 1084 ms
四月 02, 2017 12:33:52 下午 org.apache.catalina.core.StandardService startInternal
信息: Starting service Catalina
四月 02, 2017 12:33:52 下午 org.apache.catalina.core.StandardEngine startInternal
信息: Starting Servlet Engine: Apache Tomcat/9.0.0.M17
四月 02, 2017 12:33:54 下午 org.apache.catalina.core.ContainerBase startInternal
严重: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/YSDelivery]]
at java.util.concurrent.FutureTask.report(Unknown Source)
at java.util.concurrent.FutureTask.get(Unknown Source)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:939)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:872)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1419)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1409)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/YSDelivery]]
at org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:441)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:198)
... 6 more
Caused by: java.lang.NoClassDefFoundError: Lorg/apache/commons/logging/Log;
at java.lang.Class.getDeclaredFields0(Native Method)
at java.lang.Class.privateGetDeclaredFields(Unknown Source)
at java.lang.Class.getDeclaredFields(Unknown Source)
at org.apache.catalina.util.Introspection.getDeclaredFields(Introspection.java:110)
at org.apache.catalina.startup.WebAnnotationSet.loadFieldsAnnotation(WebAnnotationSet.java:262)
at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:136)
at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:66)
at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:328)
at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:778)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:299)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5077)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
... 6 more
Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.Log
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1275)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1109)
... 19 more
四月 02, 2017 12:33:54 下午 org.apache.catalina.core.ContainerBase startInternal
严重: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: A child container failed during start
at java.util.concurrent.FutureTask.report(Unknown Source)
at java.util.concurrent.FutureTask.get(Unknown Source)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:939)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:422)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:793)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.startup.Catalina.start(Catalina.java:655)
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 org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:355)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:495)
Caused by: org.apache.catalina.LifecycleException: A child container failed during start
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:948)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:872)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1419)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1409)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
四月 02, 2017 12:33:54 下午 org.apache.catalina.startup.Catalina start
严重: The required Server component failed to start so Tomcat is unable to start.
org.apache.catalina.LifecycleException: A child container failed during start
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:948)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:422)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:793)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.startup.Catalina.start(Catalina.java:655)
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 org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:355)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:495)
四月 02, 2017 12:33:54 下午 org.apache.coyote.AbstractProtocol pause
信息: Pausing ProtocolHandler ["http-nio-8080"]
四月 02, 2017 12:33:54 下午 org.apache.coyote.AbstractProtocol pause
信息: Pausing ProtocolHandler ["ajp-nio-8009"]
四月 02, 2017 12:33:54 下午 org.apache.catalina.core.StandardService stopInternal
信息: Stopping service Catalina
四月 02, 2017 12:33:54 下午 org.apache.coyote.AbstractProtocol destroy
信息: Destroying ProtocolHandler ["http-nio-8080"]
四月 02, 2017 12:33:54 下午 org.apache.coyote.AbstractProtocol destroy
信息: Destroying ProtocolHandler ["ajp-nio-8009"]
、