<%@ page contentType="text/html;charset=gb2312"%>
<%@ page import="java.lang.*"%>
<%@ page import="java.sql.*"%>
<%
Connection conn;
try
{
Class.forName("com.mysql.jdbc.Driver").newInstance();
out.print("success1");
}
catch (ClassNotFoundException e)
{}
try
{
String url="jdbc:mysql://localhost:3306/abc";
conn=DriverManager.getConnection(url,"root","123456");
out.print("success2");
}
catch (SQLException e)
{}
conn.close();
%>
出现以下错误
type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception org.apache.jasper.JasperException: Unable to compile class for JSPAn error occurred at line: 4 in the jsp file: /abc.jsp
Generated servlet error:
The local variable conn may not have been initialized
org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:84)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:328)
org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:409)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:288)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:267)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:255)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:563)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:293)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.12 logs.
这是什么错???配置还是代码??
<%@ page import="java.lang.*"%>
<%@ page import="java.sql.*"%>
<%
Connection conn;
try
{
Class.forName("com.mysql.jdbc.Driver").newInstance();
out.print("success1");
}
catch (ClassNotFoundException e)
{}
try
{
String url="jdbc:mysql://localhost:3306/abc";
conn=DriverManager.getConnection(url,"root","123456");
out.print("success2");
}
catch (SQLException e)
{}
conn.close();
%>
出现以下错误
type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception org.apache.jasper.JasperException: Unable to compile class for JSPAn error occurred at line: 4 in the jsp file: /abc.jsp
Generated servlet error:
The local variable conn may not have been initialized
org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:84)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:328)
org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:409)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:288)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:267)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:255)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:563)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:293)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.12 logs.
这是什么错???配置还是代码??
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声明一下
Connection conn=null;