NoClass definitopn found error

[Maan Suraj]

I am new to HSQLDB and jdbc....i have installed tomcat 6.0 as my web server. I have installed hsqldb_1_8_0_10 database. Database installation is succesfull as i can open the editor the database and tried inserting the tables....which were succesfull.....
But now i want to connect to my db from the java file. For that i used "FindFile.java" which is present in the guide provided in the download.

path is
C:\hsqldb\src\org\hsqldb\sample\FindFile.java.




I have created an application in webapps folder of tomcat


folder structure
webapps/ch1/WEB-INF--->web.xml
--->org/hsqldb/sample/FindFile.class


Now when i try to run the application and test my database connectivity, then i get the error as mentioned below

javax.servlet.ServletException: Error instantiating servlet class org.hsqldb.sample.FindFile
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
java.lang.Thread.run(Unknown Source)
 

root cause 
 
java.lang.NoClassDefFoundError: org/hsqldb/jdbc/jdbcDataSource
java.lang.Class.getDeclaredConstructors0(Native Method)
java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
java.lang.Class.getConstructor0(Unknown Source)
java.lang.Class.newInstance0(Unknown Source)
java.lang.Class.newInstance(Unknown Source)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
java.lang.Thread.run(Unknown Source)
 

note The full stack trace of the root cause is available in the Apache Tomcat
 

my web.xml code

 
<?xml version="1.0" encoding="UTF-8"?>
<web-app>
  <servlet>
         <servlet-name>Find</servlet-name>
       <servlet-class>org.hsqldb.sample.FindFile</servlet-class>
  </servlet>
<servlet-mapping>
       <servlet-name>Find</servlet-name>
   <url-pattern>/FF</url-pattern>
</servlet-mapping>
 </web-app>      

FindFile.java ( Took this file from the guide provided in HSQLDB1.8 download

path in the download is hsqldb\src\org\hsqldb\sample)

/* Copyright (c) 1995-2000, The Hypersonic SQL Group.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the Hypersonic SQL Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE HYPERSONIC SQL GROUP,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * on behalf of the Hypersonic SQL Group.
 *
 *
 * For work added by the HSQL Development Group:
 *
 * Copyright (c) 2001-2008, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 

package org.hsqldb.sample;
 
import java.io.File;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
 
import org.hsqldb.jdbc.jdbcDataSource;
 
/**
 * Extract a directory tree and store in an HSQLDB database.
 *
 * @author Thomas Mueller (Hypersonic SQL Group)
 * @version 1.7.0
 * @since Hypersonic SQL
 */
class FindFile {
 
    /**
     * Extracts a directory tree and stores it ina HSQLDB database.<br>
     * Usage:<p>
     * <pre>
     * java org.hsqldb.sample.FindFile -init .
     * Re-create database from directory '.'
     * java org.hsqldb.sample.FindFile name
     * Find files like 'name'
     * </pre>
     *
     * @param arg
     */
    public static void main(String[] arg) {
 
        // Exceptions may occur
        try {
 
            // get a DataSource object and set the URL
            // 'testfiles' in the URL is the name of the database
            jdbcDataSource dataSource = new jdbcDataSource();
 
            dataSource.setDatabase("jdbc:hsqldb:file:testfiles");
 
            // Connect to the database
            // It will be create automatically if it does not yet exist
            // "sa" is the user name and "" is the (empty) password
            Connection conn = dataSource.getConnection("SA", "");
 
            // Check the command line parameters
            if (arg.length == 1) {
 
                // One parameter:
                // Find and print the list of files that are like this
                listFiles(conn, arg[0]);
            } else if ((arg.length == 2) && arg[0].equals("-init")) {
 
                // Command line parameters: -init pathname
                // Init the database and fill all file names in
                fillFileNames(conn, arg[1]);
            } else {
 
                // Display the usage info
                System.out.println("Usage:");
                System.out.println("java FindFile -init .");
                System.out.println("  Re-create database from directory '.'");
                System.out.println("java FindFile name");
                System.out.println("  Find files like 'name'");
            }
 
            // Finally, close the connection
            conn.close();
        } catch (Exception e) {
 
            // Print out the error message
            System.out.println(e);
            e.printStackTrace();
        }
    }
 
    // Search in the database and list out files like this
 
    /**
     * Method declaration
     *
     *
     * @param conn
     * @param name
     *
     * @throws SQLException
     */
    static void listFiles(Connection conn, String name) throws SQLException {
 
        System.out.println("Files like '" + name + "'");
 
        // Convert to upper case, so the search is case-insensitive
        name = name.toUpperCase();
 
        // Create a statement object
        Statement stat = conn.createStatement();
 
        // Now execute the search query
        // UCASE: This is a case insensitive search
        // ESCAPE ':' is used so it can be easily searched for '\'
        ResultSet result = stat.executeQuery("SELECT Path FROM Files WHERE "
                                             + "UCASE(Path) LIKE '%" + name
                                             + "%' ESCAPE ':'");
 
        // Moves to the next record until no more records
        while (result.next()) {
 
            // Print the first column of the result
            // could use also getString("Path")
            System.out.println(result.getString(1));
        }
 
        // Close the ResultSet - not really necessary, but recommended
        result.close();
    }
 
    // Re-create the database and fill the file names in
 
    /**
     * Method declaration
     *
     *
     * @param conn
     * @param root
     *
     * @throws SQLException
     */
    static void fillFileNames(Connection conn,
                              String root) throws SQLException {
 
        System.out.println("Re-creating the database...");
 
        // Create a statement object
        Statement stat = conn.createStatement();
 
        // Try to drop the table
        try {
            stat.executeUpdate("DROP TABLE Files");
        } catch (SQLException e) {    // Ignore Exception, because the table may not yet exist
        }
 
        // For compatibility to other database, use varchar(255)
        // In HSQL Database Engine, length is unlimited, like Java Strings
        stat.execute("CREATE TABLE Files"
                     + "(Path varchar(255),Name varchar(255))");
 
        // Close the Statement object, it is no longer used
        stat.close();
 
        // Use a PreparedStatement because Path and Name could contain '
        PreparedStatement prep =
            conn.prepareCall("INSERT INTO Files (Path,Name) VALUES (?,?)");
 
        // Start with the 'root' directory and recurse all subdirectories
        fillPath(root, "", prep);
 
        // Close the PreparedStatement
        prep.close();
        System.out.println("Finished");
    }
 
    // Fill the file names, using the PreparedStatement
 
    /**
     * Method declaration
     *
     *
     * @param path
     * @param name
     * @param prep
     *
     * @throws SQLException
     */
    static void fillPath(String path, String name,
                         PreparedStatement prep) throws SQLException {
 
        File f = new File(path);
 
        if (f.isFile()) {
 
            // Clear all Parameters of the PreparedStatement
            prep.clearParameters();
 
            // Fill the first parameter: Path
            prep.setString(1, path);
 
            // Fill the second parameter: Name
            prep.setString(2, name);
 
            // Its a file: add it to the table
            prep.execute();
        } else if (f.isDirectory()) {
            if (!path.endsWith(File.separator)) {
                path += File.separator;
            }
 
            String[] list = f.list();
 
            // Process all files recursivly
            for (int i = 0; (list != null) && (i < list.length); i++) {
                fillPath(path + list[i], list[i], prep);
            }
        }
    }
}
 

What can the above error be?

[Shailesh Chandra]

Check the runtime path, It seems class jdbcDataSource is not there in runtime path.

Shailesh

[Maan Suraj]

1) I have already given the path of jdbcDataSource in my "Path" and "ClassPath " environmental variable

Path = .;C:\hsqldb\src\org\hsqldb\jdbc;
Classpath = .;C:\hsqldb\src\org\hsqldb\jdbc;
jdbcDataSource is in C:\hsqldb\src\org\hsqldb\jdbc folder.

2) I also tried giving "C:\hsqldb\src" in my path and classpath as the jdbcDataSource.java file is in package org\hsqldb\jdbc

[Kalyan Ram]

http://hsqldb.org/doc/hsqlFindFile.html

The FindFile.java, in your post, isn't extending a Servlet. OTOH its got a main()

Am I missing something?


hth
/k

[ September 20, 2008: Message edited by: Kalyan Ram ]
[ September 20, 2008: Message edited by: Kalyan Ram ]