Question

Apache tomcat log

2014年7月19日下午9:31:31 org.apache.catalina.core.StandardWrapperValve 在for中为servlet [FrontController]调用SEVERE：Servlet.service（）路径[/ GroupFound]的上下文引发了异常 java.lang.ClassCastException： org.apache.tomcat.dbcp.dbcp.BasicDataSource无法强制转换为 org.apache.tomcat.jdbc.pool.DataSource at models.bean.Customer.act（Customer.java:32）at controller.FrontController.processRequest（FrontController.java:40）at controller.FrontController.doGet（FrontController.java:61）at javax.servlet.http.HttpServlet.service（HttpServlet.java:621）at at javax.servlet.http.HttpServlet.service（HttpServlet.java:722）at at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:305）在 org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:210）在 org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter（MonitorFilter.java:393）在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:243）在 org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:210）在 org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:225）在 org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:169）在 org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:472）在 org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:168）在 org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:98）在 org.apache.catalina.valves.AccessLogValve.invoke（AccessLogValve.java:927）在 org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:118）在 org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:407）在 org.apache.coyote.http11.AbstractHttp11Processor.process（AbstractHttp11Processor.java:999）在 org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process（AbstractProtocol.java:565）在 org.apache.tomcat.util.net.JIoEndpoint $ SocketProcessor.run（JIoEndpoint.java:307）在 java.util.concurrent.ThreadPoolExecutor中的$ Worker.runTask（ThreadPoolExecutor.java:886）在 java.util.concurrent.ThreadPoolExecutor中的$ Worker.run（ThreadPoolExecutor.java:908）在java.lang.Thread.run（Thread.java:662）

错误

org.apache.tomcat.dbcp.dbcp.SQLNestedException：无法创建JDBC 上课的司机＆＃39;＆＃39;用于连接网址＆＃39; null＆＃39;在 org.apache.tomcat.dbcp.dbcp.BasicDataSource.createConnectionFactory（BasicDataSource.java:1452）在 org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource（BasicDataSource.java:1371）在 org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection（BasicDataSource.java:1044）在models.bean.Customer.act（Customer.java:33）at controller.FrontController.processRequest（FrontController.java:40）at controller.FrontController.doGet（FrontController.java:61）at javax.servlet.http.HttpServlet.service（HttpServlet.java:621）at at javax.servlet.http.HttpServlet.service（HttpServlet.java:722）at at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:305）在 org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:210）在 org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter（MonitorFilter.java:393）在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:243）在 org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:210）在 org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:225）在 org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:169）在 org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:472）在 org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:168）在 org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:98）在 org.apache.catalina.valves.AccessLogValve.invoke（AccessLogValve.java:927）在 org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:118）在 org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:407）在 org.apache.coyote.http11.AbstractHttp11Processor.process（AbstractHttp11Processor.java:999）在 org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process（AbstractProtocol.java:565）在 org.apache.tomcat.util.net.JIoEndpoint $ SocketProcessor.run（JIoEndpoint.java:307）在 java.util.concurrent.ThreadPoolExecutor中的$ Worker.runTask（ThreadPoolExecutor.java:886）在 java.util.concurrent.ThreadPoolExecutor中的$ Worker.run（ThreadPoolExecutor.java:908）在java.lang.Thread.run（Thread.java:662）引起： java.lang.NullPointerException at sun.jdbc.odbc.JdbcOdbcDriver.getProtocol（JdbcOdbcDriver.java:507）at sun.jdbc.odbc.JdbcOdbcDriver.knownURL（JdbcOdbcDriver.java:476）at at sun.jdbc.odbc.JdbcOdbcDriver.acceptsURL（JdbcOdbcDriver.java:307）at at java.sql.DriverManager.getDriver（DriverManager.java:253）at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createConnectionFactory（BasicDataSource.java:1437） ......还有26个

context.xml中 从META-INF文件夹更改。更改META-INF副本时，catalina-home / conf / Catalina / localhost / [projectname] .xml也已更改。

<?xml version="1.0" encoding="UTF-8"?>
<Context antiJARLocking="true" path="/GroupFound">
    <Resource auth="Container" 
              defaultReadOnly="false" 
              driverClassName="com.mysql.jdbc.jdbc2.optional" 
              factory="org.apache.tomcat.jdbc.pool.DataSourceFactory" 
              initialSize="0" 
              jdbcInterceptors="org.apache.tomcat.jdbc.pool.interceptor.ConnectionState;org.apache.tomcat.jdbc.pool.interceptor.StatementFinalizer" 
              jmxEnabled="true" 
              logAbandoned="true" 
              maxActive="300" maxIdle="50"
              maxWait="10000" 
              minEvictableIdleTimeMillis="300000"
              minIdle="30" 
              name="jdbc/testcp"
              password="" 
              removeAbandoned="true"
              removeAbandonedTimeout="60" 
              testOnBorrow="true"
              testOnReturn="false" 
              testWhileIdle="true" 
              timeBetweenEvictionRunsMillis="30000"
              type="javax.sql.DataSource" 
              url="jdbc:mysql://localhost:3306/test" 
              username="root"
              validationInterval="30000" 
              validationQuery="SELECT 1"/>
</Context>

Web.xml中 从应用程序上下文（netbeans IDE）更改

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
    <servlet>
        <servlet-name>FrontController</servlet-name>
        <servlet-class>controller.FrontController</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>FrontController</servlet-name>
        <url-pattern>/index</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>

    <resource-ref>
        <description>DB Connection</description>
        <res-ref-name>/jdbc/testcp</res-ref-name>
        <res-type>javax.sql.DataSource</res-type>
        <res-auth>Container</res-auth>
    </resource-ref>
</web-app>

一直在尝试修复它。搜索谷歌和类似的问题没有成功。我累死。怎么解决？我只是想看看DataSource的工作原理。

详情 JDK 6.1 netbeans 7.2 tomcat 7.0.27

Answer 1

这似乎是我能找到的最佳指南：

http://tomcat.apache.org/tomcat-7.0-doc/jndi-datasource-examples-howto.html

快速测试就是把它放在这里：

$ CATALINA_BASE / CONF / context.xml中

JDBC tomcat连接池无法正常工作

1 个答案: