Thread: preoblem in jdbc postgresql and tomcat
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@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
________________________________________________________________________
Yahoo! India Matrimony: Find your life partner online
Go to: http://yahoo.shaadi.com/india-matrimony
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@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
>
>________________________________________________________________________
>Yahoo! India Matrimony: Find your life partner online
>Go to: http://yahoo.shaadi.com/india-matrimony
>
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