Why class not found? - Mailing list pgsql-jdbc
| From | Michael Hanna |
|---|---|
| Subject | Why class not found? |
| Date | |
| Msg-id | 3575524A-B75B-11D6-A0A7-00039308EB2C@hwcn.org Whole thread Raw |
| Responses |
Re: Why class not found?
|
| List | pgsql-jdbc |
OK, thanks to all regarding my previous Exceptions question.
New problem: I'm getting a ClassNotFoundException from this line:
Class.forName("org.postgresql.Driver"); //load the driver
However I do import this package and I'm certain it's in my classpath:
[taoki:~] michael% $CLASSPATH
/System/Library/Frameworks/JavaVM.framework/Versions/1.3.1/Classes/classes.
jar:/usr/local/jakarta-
tomcat-4.0.3/common/lib/servlet.jar:/usr/local/pgsql/share/java/pgjdbc2.jar:
./: Command not found.
[taoki:~] michael%
Also that HelloPostgresql.class by Mr. Fankhauser works fine..
Any ideas...
here's the whole code:
--
Rigby.java
--
// Copyright Michael Hanna 2002
// do not use without permission of author
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*; // All we need for JDBC
public class Rigby extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse
response)throws IOException, ServletException
{
PrintWriter out;
DBThing dbt;
ResultSet results;
String database = "rigby";
String username = "postgres";
String password = "postgres";
response.setContentType("text/html");
out = response.getWriter();
out.println("<html>");
out.println("<body>");
out.println("<head>");
out.println("<title>Rigby</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Contents of friends:</h1>");
try {
Class.forName("org.postgresql.Driver"); //load the driver
out.println("<B>Inside try</B>");
dbt = new DBThing(database, username, password);
results = dbt.queryDB("select * from friends");
if (results != null)
{
out.println("<B>id" + "First Name" +"Surname" + "Email" +
"Phone"+"Bday</B>");
while (results.next())
{
out.println(results.getInt("id") +
results.getString("firstname") + results.getString("surname")+
results.getString("email")+results.getInt("tel")+results.getString("date") +
"\n");
}
}
else {
out.println("The friends database is empty.<br>");
}
results.close();
} catch (ClassNotFoundException cnf) {
out.println("***Exception:\n"+cnf);
cnf.printStackTrace();
} catch (SQLException se) {
out.println("***Exception:\n"+se);
se.printStackTrace();
}
out.println("hey2");
out.println("</body>");
out.println("</html>");
/*
try {
new DBThing(database, user, password);
} catch (ClassNotFoundException cnfe) {
throw new IOException("Could not instantiate driver: " +
cnfe.getMessage());
} catch (SQLException se) {
throw new IOException("Unable to connect to database or work
with it: " + se.getMessage());
}
*/
}
}
--
DBThing.java
--
// Copyright Michael Hanna 2002
// do not use without permission of author
import java.sql.*; // All we need for JDBC
import java.lang.*;
public class DBThing
{
Connection db; // A connection to the database
Statement sql; // Our statement to run queries with
DatabaseMetaData dbmd; // This is basically info the driver
delivers
// about the DB it just connected to. I use
// it to get the DB version to confirm the
// connection in this example.
public DBThing(String database, String username, String password)
throws ClassNotFoundException, SQLException
{
Class.forName("org.postgresql.Driver"); //load the driver
db = DriverManager.getConnection("jdbc:postgresql:"+database,
username,
password); //connect to the db
dbmd = db.getMetaData(); //get MetaData to confirm connection
System.out.println("Connection to "+dbmd.getDatabaseProductName()+" "+
dbmd.getDatabaseProductVersion()+"
successful.\n");
sql = db.createStatement(); //create a statement that we can use later
}
public ResultSet queryDB(String query) throws SQLException
{
ResultSet rs;
rs = sql.executeQuery(query); // try to query DB
return rs;
}
}
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