MySql jar file constructor

Hello,
I am developing web application using JSP and MySql. I am using netBeans 4.1 as IDE.
To connect with database I have included jar file "mysql-connector-java-3.1.10-bin.jar" to Libraries folder of my project in netBeans. This jar file contains many classes, one which I want to use is com.mysql.jdbc.Blob.
In my jsp file I want to call Blob(byte[]) constructor. For that I am doing :
com.mysql.jdbc.Blob myBlob = new com.mysql.jdbc.Blob(dataBytes);
Where dataBytes is an initialized array of bytes.
When I compile my jsp file I get error "can not find symbol". It says it is not able to find constructor.
So where I am making mistake. To resolve this problem which actions should I take??
Jahnvi

Hello,
I am developing web application using JSP and MySql. I am using netBeans 4.1 as IDE.
To connect with database I have included jar file "mysql-connector-java-3.1.10-bin.jar" to Libraries folder of my project in netBeans. This jar file contains many classes, one which I want to use is com.mysql.jdbc.Blob.
In my jsp file I want to call Blob(byte[]) constructor. For that I am doing :
com.mysql.jdbc.Blob myBlob = new com.mysql.jdbc.Blob(dataBytes);
Where dataBytes is an initialized array of bytes.
When I compile my jsp file I get error "can not find symbol". It says it is not able to find constructor.
So where I am making mistake. To resolve this problem which actions should I take??
Jahnvi

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    ==========
    package AB;
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    package AB;
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    both file compile using: javac -classpath .\ *.java
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    package com.rrs.corona.solutionsacceleratorstudio.solutionadapter;
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import java.util.jar.JarEntry;
    import java.util.jar.JarOutputStream;
    import java.util.jar.Manifest;
    import com.rrs.corona.solutionsacceleratorstudio.SASConstants;
    * @author Piku Mishra
    public class JarCreation
         * File object
         File file;
         * JarOutputStream object to create a jar file
         JarOutputStream jarOutput ;
         * File of the generated jar file
         String jarFileName = "rrs.jar";
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         Manifest manifest = null;
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                   jarOutput = new JarOutputStream(new FileOutputStream(destnPath+"/"+jarFileName),manifest);
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                   e.printStackTrace();
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    Hi,
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  • Problem using a jar file : java.lang.ClassNotFoundException: ApiConn

    Hi everyone.
    i am running a form that use a bean_area to call a jar.
    but i am getting this error, thanks in advnce for any tip.
    Java Plug-in 1.6.0_33
    Using JRE version 1.6.0_33-b05 Java HotSpot(TM) Client VM
    User home directory = C:\Users\user1
    c: clear console window
    f: finalize objects on finalization queue
    g: garbage collect
    h: display this help message
    l: dump classloader list
    m: print memory usage
    o: trigger logging
    q: hide console
    r: reload policy configuration
    s: dump system and deployment properties
    t: dump thread list
    v: dump thread stack
    x: clear classloader cache
    0-5: set trace level to <n>
    java.lang.ClassNotFoundException: ApiConn
         at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
         at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
         at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
         at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
         at java.lang.ClassLoader.loadClass(Unknown Source)
         at java.lang.Class.forName0(Native Method)
         at java.lang.Class.forName(Unknown Source)
         at oracle.forms.handler.UICommon.instantiate(Unknown Source)
         at oracle.forms.handler.UICommon.onCreate(Unknown Source)
         at oracle.forms.handler.JavaContainer.onCreate(Unknown Source)
         at oracle.forms.engine.Runform.onCreateHandler(Unknown Source)
         at oracle.forms.engine.Runform.processMessage(Unknown Source)
         at oracle.forms.engine.Runform.processSet(Unknown Source)
         at oracle.forms.engine.Runform.onMessageReal(Unknown Source)
         at oracle.forms.engine.Runform.onMessage(Unknown Source)
         at oracle.forms.engine.Runform.processEventEnd(Unknown Source)
         at oracle.ewt.lwAWT.LWComponent.redispatchEvent(Unknown Source)
         at oracle.ewt.lwAWT.LWComponent.processEvent(Unknown Source)
         at java.awt.Component.dispatchEventImpl(Unknown Source)
         at java.awt.Container.dispatchEventImpl(Unknown Source)
         at java.awt.Component.dispatchEvent(Unknown Source)
         at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
         at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
         at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
         at java.awt.Container.dispatchEventImpl(Unknown Source)
         at java.awt.Component.dispatchEvent(Unknown Source)
         at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
         at java.awt.EventQueue.access$000(Unknown Source)
         at java.awt.EventQueue$1.run(Unknown Source)
         at java.awt.EventQueue$1.run(Unknown Source)
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         at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
         at java.awt.EventQueue$2.run(Unknown Source)
         at java.awt.EventQueue$2.run(Unknown Source)
         at java.security.AccessController.doPrivileged(Native Method)
         at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
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         at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
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    Dumping class loader cache...
    Live entry: key=http://192.168.10.100:7778/forms/java/,frmall.jar,siberia_jpg.jar,ApiConn.jar,Hasher.jar,ReadCommand.jar,WriteCommand.jar,libAPI.jar, refCount=1, threadGroup=sun.plugin2.applet.Applet2ThreadGroup[name=http://192.168.10.100:7778/forms/java/-threadGroup,maxpri=4]
    Done.
    in my form i have created a bean_area and used as implementation class :ApiConn
    in my formsweb.cfg i used this configuration: archive=frmall.jar,siberia_jpg.jar,ApiConn.jar,Hasher.jar,ReadCommand.jar,WriteCommand.jar,libAPI.jar
    in my forms/java i have placed my jar files listed in the frmall.jar
    i guess i am missing something but i dont know what it is.
    here is my ApiConn.java from wich i generate my jar file:
    package libAPI;
    * This contains connection. Everything should be here,
    * should operate with this class only
    import java.io.*;
    import java.net.*;
    import java.util.concurrent.LinkedBlockingQueue;
    import java.util.logging.Level;
    import java.util.logging.Logger;
    * @author janisk
    public class ApiConn extends Thread {
    private Socket sock = null;
    private DataOutputStream out = null;
    private DataInputStream in = null;
    private String ipAddress;
    private int ipPort;
    private boolean connected = false;
    private String message = "Not connected";
    private ReadCommand readCommand = null;
    private WriteCommand writeCommand = null;
    private Thread listener = null;
    LinkedBlockingQueue queue = new LinkedBlockingQueue(40);
    * Constructor of the connection class
    * @param ipAddress - IP address of the router you want to conenct to
    * @param ipPort - port used for connection, ROS default is 8728
    public ApiConn(String ipAddress, int ipPort) {
    this.ipAddress = ipAddress;
    this.ipPort = ipPort;
    this.setName("settings");
    * State of connection
    * @return - if connection is established to router it returns true.
    public boolean isConnected() {
    return connected;
    public void disconnect() throws IOException{
    listener.interrupt();
    sock.close();
    private void listen() {
    if (this.isConnected()) {
    if (readCommand == null) {
    readCommand = new ReadCommand(in, queue);
    listener = new Thread(readCommand);
    listener.setDaemon(true);
    listener.setName("listener");
    listener.start();
    * to get IP address of the connection. Reads data from socket created.
    * @return InetAddress
    public InetAddress getIpAddress() {
    return sock == null ? null : sock.getInetAddress();
    * returns ip address that socket is asociated with.
    * @return InetAddress
    public InetAddress getLocalIpAddress() {
    return sock == null ? null : sock.getLocalAddress();
    * Socket remote port number
    * @return
    public int getPort() {
    return sock == null ? null : sock.getPort();
    * return local prot used by socket
    * @return
    public int getLocalPort() {
    return sock == null ? null : sock.getLocalPort();
    * Returns status message set up bu class.
    * @return
    public String getMessage() {
    return message;
    * sets and exectues command (sends it to RouterOS host connected)
    * @param s - command will be sent to RouterOS for example "/ip/address/print\n=follow="
    * @return
    public String sendCommand(String s) {
    return writeCommand.setCommand(s).runCommand();
    * exeecutes already set command.
    * @return returns status of the command sent
    public String runCommand() {
    return writeCommand.runCommand();
    * Tries to fech data that is repllied to commands sent. It will wait till it can return something.
    * @return returns data sent by RouterOS
    * @throws java.lang.InterruptedException
    public String getData() throws InterruptedException {
    String s = (String) queue.take();
    return s;
    * returns command that is set at this moment. And will be exectued if runCommand is exectued.
    * @return
    public String getCommand() {
    return writeCommand.getCommand();
    * set up method that will log you in
    * @param name - username of the user on the router
    * @param password - password for the user
    * @return
    public String login(String name, char[] password) {
    this.sendCommand("/login");
    String s = "a";
    try {
    s = this.getData();
    } catch (InterruptedException ex) {
    Logger.getLogger(ApiConn.class.getName()).log(Level.SEVERE, null, ex);
    return "failed read #1";
    if (!s.contains("!trap") && s.length() > 4) {
    String[] tmp = s.trim().split("\n");
    if (tmp.length > 1) {
    tmp = tmp[1].split("=ret=");
    s = "";
    String transition = tmp[tmp.length - 1];
    String chal = "";
    chal = Hasher.hexStrToStr("00") + new String(password) + Hasher.hexStrToStr(transition);
    chal = Hasher.hashMD5(chal);
    String m = "/login\n=name=" + name + "\n=response=00" + chal;
    s = this.sendCommand(m);
    try {
    s = this.getData();
    } catch (InterruptedException ex) {
    Logger.getLogger(ApiConn.class.getName()).log(Level.SEVERE, null, ex);
    return "failed read #2";
    if (s.contains("!done")) {
    if (!s.contains("!trap")) {
    return "Login successful";
    return "Login failed";
    @Override
    public void run() {
    try {
    InetAddress ia = InetAddress.getByName(ipAddress);
    if (ia.isReachable(1000)) {
    sock = new Socket(ipAddress, ipPort);
    in = new DataInputStream(sock.getInputStream());
    out = new DataOutputStream(sock.getOutputStream());
    connected = true;
    readCommand = new ReadCommand(in, queue);
    writeCommand = new WriteCommand(out);
    this.listen();
    message = "Connected";
    } else {
    message = "Not reachable";
    } catch (UnknownHostException ex) {
    connected = false;
    message = ex.getMessage();
    ex.printStackTrace();
    } catch (IOException ex) {
    connected = false;
    message = ex.getMessage();
    ex.printStackTrace();
    }

    I need your help again, i think this is a minor thing.
    i have compiled the class file that i needed and i signed it too. but now it is giving me a new error and need your tip.
    here is the java console loyout and my java file ((i think here is the problem in java file, something must be missing)).
    thanks in advance for any help.
    Java Plug-in 10.17.2.02
    Using JRE version 1.7.0_17-b02 Java HotSpot(TM) Client VM
    User home directory = C:\Users\Administrator
    c: clear console window
    f: finalize objects on finalization queue
    g: garbage collect
    h: display this help message
    l: dump classloader list
    m: print memory usage
    o: trigger logging
    q: hide console
    r: reload policy configuration
    s: dump system and deployment properties
    t: dump thread list
    v: dump thread stack
    x: clear classloader cache
    0-5: set trace level to <n>
    network: Connecting http://192.168.10.100:7778/forms/lservlet;jsessionid=c0a80a6430d6e191eded93774f2f8d1bed73056e66ef.e3mObhiMbxeKe34PahiKbx4Nbh90n6jAmljGr5XDqQLvpAe with proxy=DIRECT
    security: Validate the certificate chain using CertPath API
    security: The certificate hasnt been expired, no need to check timestamping info
    security: Cannot find jurisdiction list file
    security: The CRL support is disabled
    security: The OCSP support is disabled
    security: This OCSP End Entity validation is disabled
    security: Checking if certificate is in Deployment denied certificate store
    security: Checking if certificate is in Deployment permanent certificate store
    basic: updateValidationResultsForApplet update
    cache: Mark prevalidated: http://192.168.10.100:7778/forms/java/ApiConn.jar true tm=1363335797289 cert=1371107987000
    basic: Plugin2ClassLoader.getPermissions CeilingPolicy allPerms
    java.lang.InstantiationException: oracle.forms.siberia.ApiConn
         at java.lang.Class.newInstance0(Unknown Source)
         at java.lang.Class.newInstance(Unknown Source)
         at oracle.forms.handler.UICommon.instantiate(Unknown Source)
         at oracle.forms.handler.UICommon.onCreate(Unknown Source)
         at oracle.forms.handler.JavaContainer.onCreate(Unknown Source)
         at oracle.forms.engine.Runform.onCreateHandler(Unknown Source)
         at oracle.forms.engine.Runform.processMessage(Unknown Source)
         at oracle.forms.engine.Runform.processSet(Unknown Source)
         at oracle.forms.engine.Runform.onMessageReal(Unknown Source)
         at oracle.forms.engine.Runform.onMessage(Unknown Source)
         at oracle.forms.engine.Runform.processEventEnd(Unknown Source)
         at oracle.ewt.lwAWT.LWComponent.redispatchEvent(Unknown Source)
         at oracle.ewt.lwAWT.LWComponent.processEvent(Unknown Source)
         at java.awt.Component.dispatchEventImpl(Unknown Source)
         at java.awt.Container.dispatchEventImpl(Unknown Source)
         at java.awt.Component.dispatchEvent(Unknown Source)
         at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
         at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
         at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
         at java.awt.Container.dispatchEventImpl(Unknown Source)
         at java.awt.Component.dispatchEvent(Unknown Source)
         at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
         at java.awt.EventQueue.access$200(Unknown Source)
         at java.awt.EventQueue$3.run(Unknown Source)
         at java.awt.EventQueue$3.run(Unknown Source)
         at java.security.AccessController.doPrivileged(Native Method)
         at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
         at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
         at java.awt.EventQueue$4.run(Unknown Source)
         at java.awt.EventQueue$4.run(Unknown Source)
         at java.security.AccessController.doPrivileged(Native Method)
         at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
         at java.awt.EventQueue.dispatchEvent(Unknown Source)
         at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
         at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
         at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
         at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
         at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
         at java.awt.EventDispatchThread.run(Unknown Source)
    network: Connecting http://192.168.10.100:7778/forms/lservlet;jsessionid=c0a80a6430d6e191eded93774f2f8d1bed73056e66ef.e3mObhiMbxeKe34PahiKbx4Nbh90n6jAmljGr5XDqQLvpAe with proxy=DIRECT
    Exception in thread "Forms-DialogThread2" java.lang.NullPointerException
         at oracle.forms.handler.JavaContainer.onDestroy(Unknown Source)
         at oracle.forms.engine.Runform.destroyHandlers(Unknown Source)
         at oracle.forms.handler.DialogThread.doAlert(Unknown Source)
         at oracle.forms.handler.DialogThread.run(Unknown Source)
         at java.lang.Thread.run(Unknown Source)
    Dumping class loader cache...
    Live entry: key=http://192.168.10.100:7778/forms/java/,frmall.jar,siberia_jpg.jar,ApiConn.jar,ConcealTextField.jar, refCount=1, threadGroup=sun.plugin2.applet.Applet2ThreadGroup[name=http://192.168.10.100:7778/forms/java/-threadGroup,maxpri=4]
    Done.
    here is my java file
    * To change this template, choose Tools | Templates
    * and open the template in the editor.
    package oracle.forms.siberia;
    * This contains connection. Everything should be here,
    * should operate with this class only
    import java.io.*;
    import java.net.*;
    import java.util.concurrent.LinkedBlockingQueue;
    import java.util.logging.Level;
    import java.util.logging.Logger;
    import oracle.forms.*;
    * @author janisk
    public class ApiConn extends Thread {
    private Socket sock = null;
    private DataOutputStream out = null;
    private DataInputStream in = null;
    private String ipAddress;
    private int ipPort;
    private boolean connected = false;
    private String message = "Not connected";
    private ReadCommand readCommand = null;
    private WriteCommand writeCommand = null;
    private Thread listener = null;
    LinkedBlockingQueue queue = new LinkedBlockingQueue(40);
    * Constructor of the connection class
    * @param ipAddress - IP address of the router you want to conenct to
    * @param ipPort - port used for connection, ROS default is 8728
    public ApiConn(String ipAddress, int ipPort) {
    this.ipAddress = ipAddress;
    this.ipPort = ipPort;
    this.setName("settings");
    * State of connection
    * @return - if connection is established to router it returns true.
    public boolean isConnected() {
    return connected;
    public void disconnect() throws IOException{
    listener.interrupt();
    sock.close();
    private void listen() {
    if (this.isConnected()) {
    if (readCommand == null) {
    readCommand = new ReadCommand(in, queue);
    listener = new Thread(readCommand);
    listener.setDaemon(true);
    listener.setName("listener");
    listener.start();
    * to get IP address of the connection. Reads data from socket created.
    * @return InetAddress
    public InetAddress getIpAddress() {
    return sock == null ? null : sock.getInetAddress();
    * returns ip address that socket is asociated with.
    * @return InetAddress
    public InetAddress getLocalIpAddress() {
    return sock == null ? null : sock.getLocalAddress();
    * Socket remote port number
    * @return
    public int getPort() {
    return sock == null ? null : sock.getPort();
    * return local prot used by socket
    * @return
    public int getLocalPort() {
    return sock == null ? null : sock.getLocalPort();
    * Returns status message set up bu class.
    * @return
    public String getMessage() {
    return message;
    * sets and exectues command (sends it to RouterOS host connected)
    * @param s - command will be sent to RouterOS for example "/ip/address/print\n=follow="
    * @return
    public String sendCommand(String s) {
    return writeCommand.setCommand(s).runCommand();
    * exeecutes already set command.
    * @return returns status of the command sent
    public String runCommand() {
    return writeCommand.runCommand();
    * Tries to fech data that is repllied to commands sent. It will wait till it can return something.
    * @return returns data sent by RouterOS
    * @throws java.lang.InterruptedException
    public String getData() throws InterruptedException {
    String s = (String) queue.take();
    return s;
    * returns command that is set at this moment. And will be exectued if runCommand is exectued.
    * @return
    public String getCommand() {
    return writeCommand.getCommand();
    * set up method that will log you in
    * @param name - username of the user on the router
    * @param password - password for the user
    * @return
    public String login(String name, char[] password) {
    this.sendCommand("/login");
    String s = "a";
    try {
    s = this.getData();
    } catch (InterruptedException ex) {
    Logger.getLogger(ApiConn.class.getName()).log(Level.SEVERE, null, ex);
    return "failed read #1";
    if (!s.contains("!trap") && s.length() > 4) {
    String[] tmp = s.trim().split("\n");
    if (tmp.length > 1) {
    tmp = tmp[1].split("=ret=");
    s = "";
    String transition = tmp[tmp.length - 1];
    String chal = "";
    chal = Hasher.hexStrToStr("00") + new String(password) + Hasher.hexStrToStr(transition);
    chal = Hasher.hashMD5(chal);
    String m = "/login\n=name=" + name + "\n=response=00" + chal;
    s = this.sendCommand(m);
    try {
    s = this.getData();
    } catch (InterruptedException ex) {
    Logger.getLogger(ApiConn.class.getName()).log(Level.SEVERE, null, ex);
    return "failed read #2";
    if (s.contains("!done")) {
    if (!s.contains("!trap")) {
    return "Login successful";
    return "Login failed";
    @Override
    public void run() {
    try {
    InetAddress ia = InetAddress.getByName(ipAddress);
    if (ia.isReachable(1000)) {
    sock = new Socket(ipAddress, ipPort);
    in = new DataInputStream(sock.getInputStream());
    out = new DataOutputStream(sock.getOutputStream());
    connected = true;
    readCommand = new ReadCommand(in, queue);
    writeCommand = new WriteCommand(out);
    this.listen();
    message = "Connected";
    } else {
    message = "Not reachable";
    } catch (UnknownHostException ex) {
    connected = false;
    message = ex.getMessage();
    ex.printStackTrace();
    } catch (IOException ex) {
    connected = false;
    message = ex.getMessage();
    ex.printStackTrace();
    }

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