Re: preoblem in jdbc postgresql and tomcat

Hi,

I see 2 jdbc version in your classpath pg73jdbc3.jar and
pg74.215.jdbc3.jar.

For Tomcat you just have to drop the jdbc Jar file in

/usr/local/jakarta-tomcat-4.1.31/common/lib

No classpath to change.. Nothing.

After create an entry in Server.xml or create a Context.xml to define your datasource. See Tomcat Doc.

Works oki for me

/David

java unix wrote:

>hi,
>i have installed postgresql-7.4.1,and tomcat4.1.31and
>j2sdk1.4.2_07
>for tomcat i have included path
>/usr/local/jakarta-tomcat-4.1.31
>for j2sdk path set is /usr/local/j2sdk1.4.2_07
>and CLASSPATH SET IS:
>/usr/local/pgsql/pg73jdbc3.jar:/usr/local/pgsql/pg74.215.jdbc3.jar:/usr/local/pg
>sql/postgresql-8.0-310.jdbc3.jar:/usr/local/j2sdk1.4.2_07/lib/tools.jar:/usr/loc
>al/j2sdk1.4.2_07/jre/lib/rt.jar:/usr/local/jakarta-tomcat-4.1.31/common/lib/serv
>let.jar:/usr/local/jakarta-tomcat-4.1.31/common/lib:/usr/local/pgsql:/usr/local/
>j2sdk1.4.2_07/jre/lib:/usr/local/j2sdk1.4.2_07/lib
>i have included all the paths
>
>all the above path are set in /etc/profile/
>and i set path for all three jar
>files:/usr/local/pgsql/pg73jdbc3.jar:/usr/local/pgsql/pg74.215.jdbc3.jar:/usr/local/pg
>sql/postgresql-8.0-310.jdbc3.jar
>
>when i run this simple java program i get
>error as follows:
>[root(at)roopesh bin]# javac PostgreSQLTest.java//compile
>PostgreSQLTest.java: In class `PostgreSQLTest':
>PostgreSQLTest.java: In method
>`PostgreSQLTest.main(java.lang.String[])':
>PostgreSQLTest.java:7: Exception
>`java.lang.ClassNotFoundException' must be caught, or
>it must be declared in the `throws' clause of `main'.
>
>Class.forName("postgresql.Driver").newInstance();
> ^
>PostgreSQLTest.java:7: Exception
>`java.lang.InstantiationException' must be caught, or
>it must be declared in the `throws' clause of `main'.
>
>Class.forName("postgresql.Driver").newInstance();
> ^
>PostgreSQLTest.java:7: Exception
>`java.lang.IllegalAccessException' must be caught, or
>it must be declared in the `throws' clause of `main'.
>
>Class.forName("postgresql.Driver").newInstance();
>
>my PostgreSQLTest.java is as below
>import java.sql.*;
>
>
>
>class PostgreSQLTest {
> public static void main (String[] args) {
> try {
> Driver driver = (Driver)
>
>Class.forName("postgresql.Driver").newInstance();
> DriverManager.registerDriver(driver);
>
>
>
> String url = "jdbc:postgresql:javatest";
> Connection con =
>DriverManager.getConnection(url, "postgres", "");
> Statement stm = con.createStatement();
>
>
>
> stm.setQueryTimeout(10);
> ResultSet rs = stm.executeQuery("select col1
>from test");
>
>
>
> rs.next();
>
>
>
> System.out.println(rs.getString(1));
>
>
>
> } catch (SQLException e) {
>
>
>
> System.out.println("Exception!");
> System.out.println(e.toString());
> }
>}
>}
>This is one simple example
>
>Now when i tried to perform operations with tomcat
>simple sevlet works but with database operations i get
>the following errors
>file is:ShowBedrock.java
>import javax.servlet.*;
>import javax.servlet.http.*;
>
>
>
>public class ShowBedrock extends HttpServlet
>{
> public String getServletInfo()
> {
> return "Servlet connects to PostgreSQL database
>and displays result of a SELECT";
> }
>
>
>
> private Connection dbcon; // Connection for scope
>of ShowBedrock
>
>
>
> // "init" sets up a database connection
> public void init(ServletConfig config) throws
>ServletException
> {
> String loginUser = "postgres";
> String loginPasswd = "roopesh";
> String loginUrl =
>"jdbc:postgresql://localhost/bedrock";
>
>
>
> // Load the PostgreSQL driver
> try
> {
> Class.forName("org.postgresql.Driver");
> dbcon =
>DriverManager.getConnection(loginUrl, loginUser,
>loginPasswd);
> }
> catch (ClassNotFoundException ex)
> {
>
>System.err.println("ClassNotFoundException: " +
>ex.getMessage());
> throw new ServletException("Class not
>found Error");
> }
> catch (SQLException ex)
> {
> System.err.println("SQLException: " +
>ex.getMessage());
> }
>}
>
> //
>Use http GET
>
>
>
> public void doGet(HttpServletRequest request,
>HttpServletResponse response)
> throws IOException, ServletException
> {
> response.setContentType("text/html"); //
>Response mime type
>
>
>
> // Output stream to STDOUT
> PrintWriter out = response.getWriter();
>
>
>
>
>out.println("<HTML><Head><Title>Bedrock</Title></Head>");
> out.println("<Body><H1>Bedrock</H1>");
>
>
>
> try
> {
> // Declare our statement
> Statement statement =
>dbcon.createStatement();
>
>
>
> String query = "SELECT name, dept, ";
> query += " jobtitle ";
> query += "FROM employeee ";
>
>
>
> // Perform the query
> ResultSet rs =
>statement.executeQuery(query);
>
>
>
> out.println("<table border>");
>
>
>
> // Iterate through each row of rs
> while (rs.next())
> {
> String m_name =
>rs.getString("name");
> String m_dept =
>rs.getString("dept");
> String m_jobtitle =
>rs.getString("jobtitle");
> out.println("<tr>" +
> "<td>" + m_name +
>"</td>" +
> "<td>" + m_dept +
>"</td>" +
> "<td>" + m_jobtitle +
>"</td>" +
> "</tr>");
> }
>
>
>
> out.println("</table></body></html>");
> statement.close();
> }
> catch(Exception ex)
> {
> out.println("<HTML>" +
> "<Head><Title>" +
> "Bedrock: Error" +
> "</Title></Head>\n<Body>"
>+
> "<P>SQL error in doGet: "
>+
> ex.getMessage() +
>"</P></Body></HTML>");
> return;
> }
> out.close();
> }
>}
>when i compile i donot get any errors and class file
>is created
>when i display it in webbrowser as
>http://localhost:8080/examples/servlet/ShowBedrock
>the result is as follows
>
>Bedrock
>SQL error in doGet: null
>
>and i am working in linux
>please can any one help me with this problem i would
>like to know the solution very soon.please i have to
>do my project regarding this .i have not yet started
>the coding of my project.i am stuck up with this
>configuration.
>if the above steps what i have done is wrong please
>tell me step by step how i have to do
>please reply soon
>
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