我的编程环境为TOMCAT6.0.13,MYSQL5.0,JBUILDER2006,SERVLET API 2.5,JSDK1.6.0_02-b06,MYSQL的驱动为mysql-connector-java-5.0.7-bin.jar。
在自己的应用程序中的WEB.XML中设置了连接参数:com.mysql.jdbc.Driver,jdbc:mysql://localhost:3306/mysql,root,12345678
在IE中浏览运行出现如下错误:
HTTP Status 500 - --------------------------------------------------------------------------------type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception javax.servlet.ServletException: Servlet.init() for servlet CreateDBServlet threw exception
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:852)
org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:584)
org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1508)
java.lang.Thread.run(Unknown Source)
root cause java.lang.NullPointerException
java.lang.Class.forName0(Native Method)
java.lang.Class.forName(Unknown Source)
org.sunxin.lesson.jsp.bookstore.CreateDBServlet.init(CreateDBServlet.java:22)
javax.servlet.GenericServlet.init(GenericServlet.java:212)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:852)
org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:584)
org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1508)
java.lang.Thread.run(Unknown Source)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.13 logs.
--------------------------------------------------------------------------------Apache Tomcat/6.0.13
在自己的应用程序中的WEB.XML中设置了连接参数:com.mysql.jdbc.Driver,jdbc:mysql://localhost:3306/mysql,root,12345678
在IE中浏览运行出现如下错误:
HTTP Status 500 - --------------------------------------------------------------------------------type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception javax.servlet.ServletException: Servlet.init() for servlet CreateDBServlet threw exception
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:852)
org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:584)
org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1508)
java.lang.Thread.run(Unknown Source)
root cause java.lang.NullPointerException
java.lang.Class.forName0(Native Method)
java.lang.Class.forName(Unknown Source)
org.sunxin.lesson.jsp.bookstore.CreateDBServlet.init(CreateDBServlet.java:22)
javax.servlet.GenericServlet.init(GenericServlet.java:212)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:852)
org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:584)
org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1508)
java.lang.Thread.run(Unknown Source)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.13 logs.
--------------------------------------------------------------------------------Apache Tomcat/6.0.13
你的servlet中用了
class.forName()了吗
可能是这的错误
查看那个驱动存在吗
没有驱动吧....还是你驱动写错了?
String driverClass=getInitParameter("driverClass");
url=getInitParameter("url");
user=getInitParameter("user");
password=getInitParameter("password");
就会出现如上错误。我将连接参数直接写在程序中试试,没有问题。
String driverClass="com.mysql.jdbc.Driver";
url="jdbc:mysql://localhost:3306/mysql";
user="root";
password="12345678";
try
{
Class.forName(driverClass);
}
catch(ClassNotFoundException ce)
{
throw new UnavailableException("加载数据库驱动失败!");
}
原因是什么呢?
<context-param>
<param-name>driverClass</param-name>
<param-value>com.mysql.jdbc.Driver</param-value>
</context-param>
<context-param>
<param-name>url</param-name>
<param-value>jdbc:mysql://localhost:3306/mysql</param-value>
</context-param>
<context-param>
<param-name>user</param-name>
<param-value>root</param-value>
</context-param>
<context-param>
<param-name>password</param-name>
<param-value>12345678</param-value>
</context-param>
org.sunxin.lesson.jsp.bookstore.CreateDBServlet.init
函数的代码...^_^