jdbc ant run build.xml classpath - jdbc

Question

I'm having trouble running from ant. When I run straight from the class
file as follows it compiles and runs
Jasons-MacBook-Pro:src js$ java Hw5
Student ID: 1
First Name: Jason
Last Name: S
Phone: [phone]
Email: js#ucsd.edu
Personal Tagline: Never say never
The following line of code is used when it runs correctly as above
Connection connection = DriverManager.getConnection("jdbc:derby:/Users/js/Desktop/JavaDevelopmentAnt/HW5_JDBC/lib/Hw5Db");
my code
import java.sql.*;
import java.util.Enumeration;
public class Hw5{
public static void main (String [] args){
try{
Connection connection = DriverManager.getConnection("jdbc:derby:/Users/js/Desktop/JavaDevelopmentAnt/HW5_JDBC/lib/Hw5Db");
//Connection connection = DriverManager.getConnection("jdbc:derby:Hw5Db");//ant file code
Statement statement = connection.createStatement();
ResultSet resultSet = statement.executeQuery("SELECT * FROM STUDENT");
while(resultSet.next()){
int studentID = resultSet.getInt("STUDENT_ID");
String firstName = resultSet.getString("FIRSTNAME");
String lastName = resultSet.getString("LASTNAME");
String phone = resultSet.getString("PHONE");
String email = resultSet.getString("EMAIL");
String mantra = resultSet.getString("PERSONAL_TAGLINE");
System.out.println("Student ID: " + studentID + "\n" +
"First Name: " + firstName + "\n" +
"Last Name: " + lastName + "\n" +
"Phone: " + phone + "\n" +
"Email: " + email + "\n" +
"Personal Tagline: " + mantra + "\n");
}
resultSet.close();
statement.close();
connection.close();
}
catch(SQLException sqle){
System.err.println("SQL Exception: " + sqle);
}
}
}
but when I try from my build.xml i change the following line of code to
Connection connection = DriverManager.getConnection("jdbc:derby:Hw5Db");
because i think database jar file (Hw5Db) is in the classpath of my build.xml
my build.xml
<?xml version="1.0"?>
<project name="Hw5" default="compile" basedir=".">
<property environment="env"/>
<property name="src" value="${basedir}/src"/>
<property name="bin" value="${basedir}/bin"/>
<property name="lib" value="${basedir}/lib"/>
<property name="doc" value="${basedir}/doc"/>
<property name="build" value="${basedir}/build"/>
<target name="prepare" description="Setting up temporary directory to support build">
<mkdir dir="${build}"/>
<mkdir dir="${bin}"/>
</target>
<target name="compile" depends="prepare" description="compile java sources">
<javac srcdir="${src}" destdir="${build}" includes="**/*.java" listfiles="yes" includeantruntime="false">
</javac>
</target>
<target name="deploy" depends="compile">
<jar destfile="${bin}/Hw5.jar" basedir="${build}"/>
<jar destfile="${bin}/Hw5Db.jar" basedir="${lib}"/>
</target>
<target name="run" depends="deploy" description="run the project">
<java fork="true" classname="Hw5">
<classpath path="${bin}/Hw5.jar"/>
<classpath path="${bin}/Hw5Db.jar"/>
</java>
</target>
<target name="clean">
<delete dir="${build}"/>
<delete dir="${bin}"/>
</target>
</project>
Jasons-MacBook-Pro:HW5_JDBC jsteindorf$ ant run
Buildfile: /Users/js/Desktop/JavaDevelopmentAnt/HW5_JDBC/build.xml
prepare:
[mkdir] Created dir: /Users/js/Desktop/JavaDevelopmentAnt/HW5_JDBC/build
[mkdir] Created dir: /Users/js/Desktop/JavaDevelopmentAnt/HW5_JDBC/bin
compile:
[javac] Compiling 1 source file to /Users/js/Desktop/JavaDevelopmentAnt/HW5_JDBC/build
[javac] /Users/js/Desktop/JavaDevelopmentAnt/HW5_JDBC/src/Hw5.java
deploy:
[jar] Building jar: /Users/jsteindorf/Desktop/JavaDevelopmentAnt/HW5_JDBC/bin/Hw5.jar
[jar] Building jar: /Users/jsteindorf/Desktop/JavaDevelopmentAnt/HW5_JDBC/bin/Hw5Db.jar
run:
[java] SQL Exception: java.sql.SQLException: No suitable driver found for jdbc:derby:Hw5Db
BUILD SUCCESSFUL
Total time: 2 seconds
I'm trying, I just can't get it to work

Answer 1

Not sure but maybe you need register the driver before use it.
Class.forName("class_of_driver").getInstance();
And after:
Connection connection = DriverManager.getConnection("jdbc:derby:./Hw5Db");

Answer 2

The duplicate classpath on the java task looks a bit strange to me. Try the following instead:
<java fork="true" classname="Hw5">
<classpath path="${bin}/Hw5.jar:${bin}/Hw5Db.jar"/>
</java>

Answer 3

i fixed the issue, the build.xml wasn't finding to the database drivers
classpath path="${env.DERBY_HOME}/lib/derby.jar
classpath path="${env.DERBY_HOME}/lib/derbytools.jar
and the connection path to the database should have been
jdbc:derby:./lib/Hw5Db