a project I did before was given to a college student as the graduation device. When running on her computer, I reported the following error message. The following is the complete error message:

tomcat starts the following error:

十月 04, 2018 10:14:45 下午 org.apache.catalina.core.AprLifecycleListener init
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 Files\Java123\jdk1.8.0_31\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:/Program Files/Java123/bin/server;C:/Program Files/Java123/bin;C:/Program Files/Java123/lib/amd64;C:\ProgramData\Oracle\Java\javapath;C:\乱七八糟的东西\好好学习天天向上\GIS开发与编程\2\supermap-iobjectsdotnet-9.0.0-15321-63946-win-zip-chs\Bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Program Files\Microsoft SQL Server\110\DTS\Binn\;C:\Program Files (x86)\Microsoft SQL Server\110\Tools\Binn\;C:\Program Files\Microsoft SQL Server\110\Tools\Binn\;C:\Program Files (x86)\Microsoft SQL Server\110\Tools\Binn\ManagementStudio\;C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\PrivateAssemblies\;C:\Program Files (x86)\Microsoft SQL Server\110\DTS\Binn\;C:\WINDOWS\system32\config\systemprofile\.dnx\bin;C:\Program Files\Microsoft DNX\Dnvm\;C:\Program Files\Java\jdk1.7.0_79\bin;C:\Program Files\Java\jdk1.7.0_79\jre\bin;C:\Program Files (x86)\Common Files\Autodesk Shared\;C:\Program Files\MySQL\MySQL Utilities 1.6\;C:\WINDOWS\System32\OpenSSH\;C:\Program Files\Java123\jdk1.8.0_31\bin;C:\Program Files\Java\jdk1.7.0_79\jre\bin;C:\Program Files (x86)\Microsoft Visual Studio\Common\Tools\WinNT;C:\Program Files (x86)\Microsoft Visual Studio\Common\MSDev98\Bin;C:\Program Files (x86)\Microsoft Visual Studio\Common\Tools;C:\Program Files (x86)\Microsoft Visual Studio\VC98\bin;%USERPROFILE%\AppData\Local\Microsoft\WindowsApps;;C:\Users\30801\Desktop\eclipse;;.
十月 04, 2018 10:14:45 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:cunity' did not find a matching property.
十月 04, 2018 10:14:46 下午 org.apache.coyote.AbstractProtocol init
信息: Initializing ProtocolHandler ["http-bio-8080"]
十月 04, 2018 10:14:46 下午 org.apache.coyote.AbstractProtocol init
信息: Initializing ProtocolHandler ["ajp-bio-8009"]
十月 04, 2018 10:14:46 下午 org.apache.catalina.startup.Catalina load
信息: Initialization processed in 1126 ms
十月 04, 2018 10:14:46 下午 org.apache.catalina.core.StandardService startInternal
信息: Starting service Catalina
十月 04, 2018 10:14:46 下午 org.apache.catalina.core.StandardEngine startInternal
信息: Starting Servlet Engine: Apache Tomcat/7.0.27
十月 04, 2018 10:14:46 下午 org.apache.catalina.util.SessionIdGenerator createSecureRandom
信息: Creation of SecureRandom instance for session ID generation using [SHA1PRNG] took [229] milliseconds.
十月 04, 2018 10:14:49 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[/cunity]]
	at java.util.concurrent.FutureTask.report(FutureTask.java:122)
	at java.util.concurrent.FutureTask.get(FutureTask.java:192)
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1128)
	at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:782)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1566)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1556)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/cunity]]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
	... 6 more
Caused by: org.apache.tomcat.util.bcel.classfile.ClassFormatException: Invalid byte tag in constant pool: 15
	at org.apache.tomcat.util.bcel.classfile.Constant.readConstant(Constant.java:131)
	at org.apache.tomcat.util.bcel.classfile.ConstantPool.<init>(ConstantPool.java:60)
	at org.apache.tomcat.util.bcel.classfile.ClassParser.readConstantPool(ClassParser.java:209)
	at org.apache.tomcat.util.bcel.classfile.ClassParser.parse(ClassParser.java:119)
	at org.apache.catalina.startup.ContextConfig.processAnnotationsStream(ContextConfig.java:2032)
	at org.apache.catalina.startup.ContextConfig.processAnnotationsJar(ContextConfig.java:1923)
	at org.apache.catalina.startup.ContextConfig.processAnnotationsUrl(ContextConfig.java:1891)
	at org.apache.catalina.startup.ContextConfig.processAnnotations(ContextConfig.java:1877)
	at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1270)
	at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:855)
	at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:345)
	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
	at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5161)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	... 6 more

十月 04, 2018 10:14:49 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]]
	at java.util.concurrent.FutureTask.report(FutureTask.java:122)
	at java.util.concurrent.FutureTask.get(FutureTask.java:192)
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1128)
	at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:302)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.StandardService.startInternal(StandardService.java:443)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:732)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:675)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:483)
	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:322)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:450)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1566)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1556)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.catalina.LifecycleException: A child container failed during start
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1136)
	at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:782)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	... 6 more

十月 04, 2018 10:14:49 下午 org.apache.catalina.startup.Catalina start
严重: Catalina.start: 
org.apache.catalina.LifecycleException: Failed to start component [StandardServer[8005]]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:675)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:483)
	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:322)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:450)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardService[Catalina]]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
	at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:732)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	... 7 more
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina]]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
	at org.apache.catalina.core.StandardService.startInternal(StandardService.java:443)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	... 9 more
Caused by: org.apache.catalina.LifecycleException: A child container failed during start
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1136)
	at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:302)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	... 11 more

十月 04, 2018 10:14:49 下午 org.apache.catalina.startup.Catalina start
信息: Server startup in 3828 ms

for this reason, I searched for this mistake for a whole day, also went to the Internet to look for, saw a lot of solutions on the Internet, I also summed up the following points:

1. Cache is not cleaned up by tomcat.

2. Log4j.jar package not imported.

3. Configuration in web.xml < servlet-mapping> “, not “/”.

4. No servlet-api.jar imported.

5. The version of the package is inconsistent.

none of that.

solution is: tomcat under the lib all jar is wrong, why, you follow my train of thought: click these to go to see the source code.

look at the head, is there something that says catalina.jar, right at the top of the source code. Then click in these, keep looking for, find the lib under Tomcat, you will find that you just saw the source code on the head of the jar package, is the lib under Tomcat these jar packages.

yes, that’s all make of ghost, I’ll have (tomcat7) : https://download.csdn.net/download/qq_41879385/10701965, only need to future generations in the paste, again running tomcat, to regroup, of course, you can run a success, I am looking for a day of error, so settled.