Java 升级到 Tomcat 8 时出现 ClassNotFoundException
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ClassNotFoundException when upgraded to Tomcat 8
提问by Nital
I recently upgraded my NetBeans IDE from v7.3 to v8 and all of a sudden my application throws an exception at server startup while connecting to DB. The only difference between these two versions of IDE are that the later one is using Tomcat 8.
我最近将我的 NetBeans IDE 从 v7.3 升级到 v8，突然我的应用程序在连接到数据库时在服务器启动时抛出异常。这两个版本的 IDE 唯一的区别是后者使用的是 Tomcat 8。
Exception Log:
异常日志：
javax.naming.NamingException: Could not load resource factory class [Root exception is java.lang.ClassNotFoundException: org.apache.tomcat.dbcp.dbcp.BasicDataSourceFactory]
at org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:82)
at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:321)
at org.apache.naming.NamingContext.lookup(NamingContext.java:841)
at org.apache.naming.NamingContext.lookup(NamingContext.java:152)
at org.apache.naming.NamingContext.lookup(NamingContext.java:829)
at org.apache.naming.NamingContext.lookup(NamingContext.java:152)
at org.apache.naming.NamingContext.lookup(NamingContext.java:829)
at org.apache.naming.NamingContext.lookup(NamingContext.java:152)
at org.apache.naming.NamingContext.lookup(NamingContext.java:829)
at org.apache.naming.NamingContext.lookup(NamingContext.java:166)
at org.apache.naming.SelectorContext.lookup(SelectorContext.java:157)
at javax.naming.InitialContext.lookup(InitialContext.java:411)
at com.istore.core.listeners.AppContextListener.initdb(AppContextListener.java:44)
at com.istore.core.listeners.AppContextListener.contextInitialized(AppContextListener.java:27)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4738)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5158)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:726)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:702)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:697)
at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:579)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:455)
at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1554)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
at org.apache.catalina.manager.ManagerServlet.check(ManagerServlet.java:1428)
at org.apache.catalina.manager.ManagerServlet.deploy(ManagerServlet.java:885)
at org.apache.catalina.manager.ManagerServlet.doGet(ManagerServlet.java:343)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:618)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:301)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:615)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:136)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:74)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:516)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1015)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:652)
at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1575)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1533)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)
Caused by: java.lang.ClassNotFoundException: org.apache.tomcat.dbcp.dbcp.BasicDataSourceFactory
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1284)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1132)
at org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:80)
... 58 more
META-INF/context.xml
META-INF/context.xml
<!-- PostgreSQL Datasource -->
<Resource auth="Container" driverClassName="org.postgresql.Driver" factory="org.apache.tomcat.dbcp.dbcp.BasicDataSourceFactory" maxActive="50" maxIdle="10" maxWait="-1" name="jdbc/mydb" type="javax.sql.DataSource" url="jdbc:postgresql://myorg.corp.net:5432/mydb" username="abc" password="def" />
Please guide.
请指导。
采纳答案by Mark Thomas
The name of the default factory changed between Tomcat 7 and Tomcat 8. A couple of attribute names also changed. This is all as a result of switching from DBCP 1.x to DBCP 2.x in Tomcat 8. You want the following in your META-INF/context.xml file:
默认工厂的名称在 Tomcat 7 和 Tomcat 8 之间发生了变化。一些属性名称也发生了变化。这都是在 Tomcat 8 中从 DBCP 1.x 切换到 DBCP 2.x 的结果。您需要在 META-INF/context.xml 文件中包含以下内容：
<!-- PostgreSQL Datasource -->
<Resource auth="Container"
driverClassName="org.postgresql.Driver"
factory="org.apache.tomcat.dbcp.dbcp2.BasicDataSourceFactory"
maxTotal="50"
maxIdle="10"
maxWaitMillis="-1"
name="jdbc/mydb"
type="javax.sql.DataSource"
url="jdbc:postgresql://myorg.corp.net:5432/mydb"
username="abc"
password="def" />
Since this factory is used by default for resources of type javax.sql.DataSourceyou can just drop that attribute all together. The other changes were:
由于默认情况下将此工厂用于类型资源，因此javax.sql.DataSource您可以一起删除该属性。其他变化是：
maxActive -> maxTotal
maxWait -> maxWaitMillis
回答by Imran Bhat
You need tomcat-dbcp-8.0.0-RC1.jarin your tomcat8lib folder. The package structure for org.apache.tomcat.dbcp.dbcp2.BasicDataSourceFactoryin commons-dbcp.jaris different from other tomcatversions.
你需要tomcat-dbcp-8.0.0-RC1.jar在你的tomcat8lib 文件夹中。org.apache.tomcat.dbcp.dbcp2.BasicDataSourceFactoryin的包结构commons-dbcp.jar与其他tomcat版本不同。
