ClassNotFound：ComboPooledDataSource，后跟 JasperException：/struts-tags is missing
ClassNotFound: ComboPooledDataSource, followed by JasperException: /struts-tags is missing
我被投入到一个 Spring/Struts/Hibernate 等已经通过 Maven 为我设置的项目中。我对这些技术没有任何先验知识，只是边学边学，我正在使用 Eclipse。
今天我开始研究 Solr（该库已经是一个 Maven 依赖项），运行 class 中的代码和一个 main 方法并确保它工作正常，然后再合并Solr 以正确的方式填充（命令模式）。
事情是，一旦我这样做了，我就开始得到这个：
ClassNotFoundException: Cannot find class [com.mchange.v2.c3p0.ComboPooledDataSource] for bean with name 'dataSource'
我没有完整的轨迹，因为我没有想过保存它，也无法再复制它。这是我的 datasource.xml，它抱怨缺少 class：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- connection pool implementation c3p0 http://www.mchange.com/projects/c3p0 -->
<bean id="dataSource"
class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
<property name="driverClass" value="com.microsoft.sqlserver.jdbc.SQLServerDriver" />
<property name="jdbcUrl" value="${datasource.url}"/>
<property name="user" value="${datasource.username}"/>
<property name="password" value="${datasource.password}"/>
<property name="acquireIncrement" value="3"/>
<property name="initialPoolSize" value="3"/>
<property name="minPoolSize" value="3"/>
<property name="maxPoolSize" value="150"/>
<property name="testConnectionOnCheckin" value="true"/>
<property name="idleConnectionTestPeriod" value="300"/>
<property name="preferredTestQuery" value="select 1"/>
</bean>
</beans>
class 肯定在 Maven 依赖项中。我无法找出错误，所以我恢复到 git 上的工作版本。现在我在启动服务器时得到以下输出：
Aug 30, 2016 4:03:46 PM org.apache.catalina.core.AprLifecycleListener init
INFO: 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\Java\jdk1.8.0_91\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:/Program Files/Java/jdk1.8.0_91/bin/../jre/bin/server;C:/Program Files/Java/jdk1.8.0_91/bin/../jre/bin;C:/Program Files/Java/jdk1.8.0_91/bin/../jre/lib/amd64;C:\ProgramData\Oracle\Java\javapath;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Interwoven\WorkSite\;C:\Program Files\Common Files\Philips Speech Shared\Components;C:\Program Files (x86)\Enterprise Vault\EVClient\;C:\Program Files (x86)\WebEx\Productivity Tools;C:\Program Files\TortoiseGit\bin;C:\Program Files\Git\cmd;C:\Program Files\Microsoft SQL Server\Client SDK\ODBC0\Tools\Binn\;C:\Program Files (x86)\Microsoft SQL Server0\Tools\Binn\;C:\Program Files\Microsoft SQL Server0\Tools\Binn\;C:\Program Files\Microsoft SQL Server0\DTS\Binn\;C:\Program Files (x86)\Microsoft SQL Server0\Tools\Binn\ManagementStudio\;C:\Program Files (x86)\Microsoft SQL Server0\DTS\Binn\;"C:\typesafe-activator-1.3.10\activator-dist-1.3.10\bin";"C:\Programs\sbt\bin";C:\Programs\eclipse;;.
Aug 30, 2016 4:03:46 PM org.apache.coyote.http11.Http11Protocol init
INFO: Initializing Coyote HTTP/1.1 on http-8080
Aug 30, 2016 4:03:46 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 500 ms
Aug 30, 2016 4:03:46 PM org.apache.catalina.core.StandardService start
INFO: Starting service Catalina
Aug 30, 2016 4:03:46 PM org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/6.0.45
Aug 30, 2016 4:03:47 PM org.apache.catalina.startup.HostConfig deployDescriptor
INFO: Deploying configuration descriptor com.pinsentmasons.clauseextract.web.xml
Aug 30, 2016 4:03:47 PM org.apache.coyote.http11.Http11Protocol start
INFO: Starting Coyote HTTP/1.1 on http-8080
Aug 30, 2016 4:03:47 PM org.apache.jk.common.ChannelSocket init
INFO: JK: ajp13 listening on /0.0.0.0:8009
Aug 30, 2016 4:03:47 PM org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=0/15 config=null
Aug 30, 2016 4:03:47 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 304 ms
现在，当我加载网页时，我得到以下信息：
SEVERE: Servlet.service() for servlet jsp threw exception
org.apache.jasper.JasperException: /index.jsp(2,41) File "/struts-tags" not found
at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)
at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:132)
at org.apache.jasper.compiler.TagLibraryInfoImpl.<init>(TagLibraryInfoImpl.java:163)
at org.apache.jasper.compiler.Parser.parseTaglibDirective(Parser.java:386)
at org.apache.jasper.compiler.Parser.parseDirective(Parser.java:450)
at org.apache.jasper.compiler.Parser.parseElements(Parser.java:1400)
at org.apache.jasper.compiler.Parser.parse(Parser.java:130)
at org.apache.jasper.compiler.ParserController.doParse(ParserController.java:255)
at org.apache.jasper.compiler.ParserController.parse(ParserController.java:103)
at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:185)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:354)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:334)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:321)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:592)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:328)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:612)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:503)
at java.lang.Thread.run(Thread.java:745)
这个版本的代码在提交时完全可以正常工作，所以我可以假设代码不再有问题。我曾尝试清理项目并进行 Maven 更新，但无济于事。我很迷路。
所以我发现问题与 类 甚至我自己的代码无关，而是 Tomcat 的问题。
我正在清理项目并通过 Maven 执行更新项目，但是我没有清理 Tomcat 服务器，清理并重新发布项目后一切都恢复到工作状态。
我被投入到一个 Spring/Struts/Hibernate 等已经通过 Maven 为我设置的项目中。我对这些技术没有任何先验知识，只是边学边学，我正在使用 Eclipse。
今天我开始研究 Solr（该库已经是一个 Maven 依赖项），运行 class 中的代码和一个 main 方法并确保它工作正常，然后再合并Solr 以正确的方式填充（命令模式）。
事情是，一旦我这样做了，我就开始得到这个：
ClassNotFoundException: Cannot find class [com.mchange.v2.c3p0.ComboPooledDataSource] for bean with name 'dataSource'
我没有完整的轨迹，因为我没有想过保存它，也无法再复制它。这是我的 datasource.xml，它抱怨缺少 class：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- connection pool implementation c3p0 http://www.mchange.com/projects/c3p0 -->
<bean id="dataSource"
class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
<property name="driverClass" value="com.microsoft.sqlserver.jdbc.SQLServerDriver" />
<property name="jdbcUrl" value="${datasource.url}"/>
<property name="user" value="${datasource.username}"/>
<property name="password" value="${datasource.password}"/>
<property name="acquireIncrement" value="3"/>
<property name="initialPoolSize" value="3"/>
<property name="minPoolSize" value="3"/>
<property name="maxPoolSize" value="150"/>
<property name="testConnectionOnCheckin" value="true"/>
<property name="idleConnectionTestPeriod" value="300"/>
<property name="preferredTestQuery" value="select 1"/>
</bean>
</beans>
class 肯定在 Maven 依赖项中。我无法找出错误，所以我恢复到 git 上的工作版本。现在我在启动服务器时得到以下输出：
Aug 30, 2016 4:03:46 PM org.apache.catalina.core.AprLifecycleListener init
INFO: 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\Java\jdk1.8.0_91\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:/Program Files/Java/jdk1.8.0_91/bin/../jre/bin/server;C:/Program Files/Java/jdk1.8.0_91/bin/../jre/bin;C:/Program Files/Java/jdk1.8.0_91/bin/../jre/lib/amd64;C:\ProgramData\Oracle\Java\javapath;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Interwoven\WorkSite\;C:\Program Files\Common Files\Philips Speech Shared\Components;C:\Program Files (x86)\Enterprise Vault\EVClient\;C:\Program Files (x86)\WebEx\Productivity Tools;C:\Program Files\TortoiseGit\bin;C:\Program Files\Git\cmd;C:\Program Files\Microsoft SQL Server\Client SDK\ODBC0\Tools\Binn\;C:\Program Files (x86)\Microsoft SQL Server0\Tools\Binn\;C:\Program Files\Microsoft SQL Server0\Tools\Binn\;C:\Program Files\Microsoft SQL Server0\DTS\Binn\;C:\Program Files (x86)\Microsoft SQL Server0\Tools\Binn\ManagementStudio\;C:\Program Files (x86)\Microsoft SQL Server0\DTS\Binn\;"C:\typesafe-activator-1.3.10\activator-dist-1.3.10\bin";"C:\Programs\sbt\bin";C:\Programs\eclipse;;.
Aug 30, 2016 4:03:46 PM org.apache.coyote.http11.Http11Protocol init
INFO: Initializing Coyote HTTP/1.1 on http-8080
Aug 30, 2016 4:03:46 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 500 ms
Aug 30, 2016 4:03:46 PM org.apache.catalina.core.StandardService start
INFO: Starting service Catalina
Aug 30, 2016 4:03:46 PM org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/6.0.45
Aug 30, 2016 4:03:47 PM org.apache.catalina.startup.HostConfig deployDescriptor
INFO: Deploying configuration descriptor com.pinsentmasons.clauseextract.web.xml
Aug 30, 2016 4:03:47 PM org.apache.coyote.http11.Http11Protocol start
INFO: Starting Coyote HTTP/1.1 on http-8080
Aug 30, 2016 4:03:47 PM org.apache.jk.common.ChannelSocket init
INFO: JK: ajp13 listening on /0.0.0.0:8009
Aug 30, 2016 4:03:47 PM org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=0/15 config=null
Aug 30, 2016 4:03:47 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 304 ms
现在，当我加载网页时，我得到以下信息：
SEVERE: Servlet.service() for servlet jsp threw exception
org.apache.jasper.JasperException: /index.jsp(2,41) File "/struts-tags" not found
at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)
at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:132)
at org.apache.jasper.compiler.TagLibraryInfoImpl.<init>(TagLibraryInfoImpl.java:163)
at org.apache.jasper.compiler.Parser.parseTaglibDirective(Parser.java:386)
at org.apache.jasper.compiler.Parser.parseDirective(Parser.java:450)
at org.apache.jasper.compiler.Parser.parseElements(Parser.java:1400)
at org.apache.jasper.compiler.Parser.parse(Parser.java:130)
at org.apache.jasper.compiler.ParserController.doParse(ParserController.java:255)
at org.apache.jasper.compiler.ParserController.parse(ParserController.java:103)
at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:185)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:354)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:334)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:321)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:592)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:328)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:612)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:503)
at java.lang.Thread.run(Thread.java:745)
这个版本的代码在提交时完全可以正常工作，所以我可以假设代码不再有问题。我曾尝试清理项目并进行 Maven 更新，但无济于事。我很迷路。
所以我发现问题与 类 甚至我自己的代码无关，而是 Tomcat 的问题。
我正在清理项目并通过 Maven 执行更新项目，但是我没有清理 Tomcat 服务器，清理并重新发布项目后一切都恢复到工作状态。