Why Can't I Connect to MySQL with JSP?

Here is the code I'm trying to use:

Code:

---

<&#37;
String mysql_DRIVER = "com.mysql.jdbc.Driver";
String mysql_USERNAME = "hre3oadmin";
String mysql_PASSWORD = "@Room15";
String mysql_STRING = "jdbc:mysql://10.10.100.200:3306/hreo_main_db";

Connection connection = null;

Class.forName("com.mysql.jdbc.Driver").newInstance();
connection = DriverManager.getConnection(mysql_STRING,mysql_USERNAME,mysql_PASSWORD);

if(!connection.isClosed())
        out.println("Successfully connected to " + "MySQL server using TCP/IP...");
        connection.close();
}
catch(Exception ex){
        out.println("Unable to connect to database.");
}

%>

---

The error I get is as follows:

Quote:

---

HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: org.apache.jasper.JasperException: Unable to load class for JSP
org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:156)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:329)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

root cause

org.apache.jasper.JasperException: Unable to load class for JSP
org.apache.jasper.JspCompilationContext.load(JspCompilationContext.java:620)
org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:144)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:329)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

root cause

java.lang.ClassNotFoundException: org.apache.jsp.questionnaire.classes.mysql_jsp
java.net.URLClassLoader$1.run(Unknown Source)
java.security.AccessController.doPrivileged(Native Method)
java.net.URLClassLoader.findClass(Unknown Source)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:134)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:66)
org.apache.jasper.JspCompilationContext.load(JspCompilationContext.java:618)
org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:144)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:329)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.18 logs.

---

I'm thinking I'm not pointing to the mysql driver correctly.

I have mysql-connector-java-5.1.7-bin.jar in the following directories:

• /exit/WEB-INF/classes/lib
• /exit/WEB-INF/lib
• /exit/WEB-INF

Any help I can get would be incredibly appreciated. I've never touched JSP a day in my life... it's a lot more difficult than PHP it seems ;).

Thanks :)

Here's another error I'm getting if I refresh enough:

Quote:

---

HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: Unable to compile class for JSP:

An error occurred at line: 7 in the jsp file: /questionnaire/classes/mysql.jsp
Connection cannot be resolved to a type
4: String mysql_PASSWORD = "@Room1";
5: String mysql_STRING = "jdbc:mysql://10.10.100.200:3306/hreo_main_db";
6:
7: Connection connection = null;
8:
9: Class.forName("com.mysql.jdbc.Driver").newInstance();
10: connection = DriverManager.getConnection(mysql_STRING,mysql_USERNAME,mysql_PASSWORD);


An error occurred at line: 10 in the jsp file: /questionnaire/classes/mysql.jsp
DriverManager cannot be resolved
7: Connection connection = null;
8:
9: Class.forName("com.mysql.jdbc.Driver").newInstance();
10: connection = DriverManager.getConnection(mysql_STRING,mysql_USERNAME,mysql_PASSWORD);
11:
12: if(!connection.isClosed())
13: out.println("Successfully connected to " + "MySQL server using TCP/IP...");


An error occurred at line: 73 in the generated java file
Syntax error on token "catch", Identifier expected

An error occurred at line: 75 in the generated java file
out cannot be resolved

An error occurred at line: 75 in the generated java file
_jspx_out cannot be resolved

An error occurred at line: 76 in the generated java file
out cannot be resolved

An error occurred at line: 76 in the generated java file
out cannot be resolved

An error occurred at line: 77 in the generated java file
out cannot be resolved

An error occurred at line: 78 in the generated java file
_jspx_page_context cannot be resolved

An error occurred at line: 78 in the generated java file
_jspx_page_context cannot be resolved

An error occurred at line: 80 in the generated java file
Syntax error on token "finally", { expected

An error occurred at line: 81 in the generated java file
_jspx_page_context cannot be resolved

Stacktrace:
org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:92)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330)
org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:423)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:317)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:295)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:282)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:586)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.18 logs.
Apache Tomcat/6.0.18

---

Thanks for any help I can receive.

you need to have import statements in your jsp.

Quote:

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Originally Posted by chazzy

you need to have import statements in your jsp.

---

How do I go about doing this?

I'm new to JSP (I use PHP heavily).

Thanks for your help :)

http://www.jsptut.com/Directives.jsp

Quote:

---

Originally Posted by chazzy

http://www.jsptut.com/Directives.jsp

---

Ok, I was able to get a little further, but now I'm at a roadblock again.

Here is my current code:

Code:

---

<&#37;@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*" errorPage="" %>
<%



String mysql_DRIVER = "com.mysql.jdbc.Driver";
String mysql_USERNAME = "hreoadmin";
String mysql_PASSWORD = "@Room1";
String mysql_STRING = "jdbc:mysql://10.10.100.200:3306/hreo_main_db";

Connection connection=null;
ResultSet rs;

response.setContentType("text/html");

try{
        // Load the database driver
        Class.forName(mysql_DRIVER);
} 
finally{
}

%>

---

Here is the error page I get:

Quote:

---

org.apache.jasper.JasperException: An exception occurred processing JSP page /questionnaire/classes/mysql.jsp at line 18

15:
16: try{
17: // Load the database driver
18: Class.forName(mysql_DRIVER);
19: }
20: finally{
21: }


Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:505)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:398)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

root cause

javax.servlet.ServletException: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:852)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:781)
org.apache.jsp.questionnaire.classes.mysql_jsp._jspService(mysql_jsp.java:83)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

root cause

java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1387)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1233)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:128)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:66)
java.lang.ClassLoader.loadClassInternal(Unknown Source)
java.lang.Class.forName0(Native Method)
java.lang.Class.forName(Unknown Source)
org.apache.jsp.questionnaire.classes.mysql_jsp._jspService(mysql_jsp.java:72)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

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Thanks again for all your help :).

is the mysql driver in your WEB-INF/lib directory?