JAR File Signing : NoClassDefFoundError

Question

Hi,
I have followed the new white paper, JAR file signing for JInit 1.3, and have used workround 2 to Register My Custom Sigingn Certificate Seperately.
All appears to ge well, i.e. the dialog is shown, and when granted, the cerificate is listed within the JINIT 1.3 console.
Howver, when I attempt to access Java code attempting to break out of the sandbox (executing a Host command), I receive a Java Exception :
Exception occurred during event dispatching:
java.lang.NoClassDefFoundError: oracle/forms/ui/VBean
     at java.lang.ClassLoader.defineClass0(Native Method)
     at java.lang.ClassLoader.defineClass(Unknown Source)
     at java.security.SecureClassLoader.defineClass(Unknown Source)
     at java.net.URLClassLoader.defineClass(Unknown Source)
     at java.net.URLClassLoader.access$100(Unknown Source)
     at java.net.URLClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClassInternal(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.Window.dispatchEventImpl(Unknown Source)
     at java.awt.Component.dispatchEvent(Unknown Source)
     at java.awt.EventQueue.dispatchEvent(Unknown Source)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
     at java.awt.EventDispatchThread.run(Unknown Source)
The oracle/forms/VBean.class is included within the JAR cache, as downloaded within f60all_jinit.jar (also used f60jinit.jar). These are as delivered within Patchset 11.
We are using Forms 6i and JInit 1.3.1.9.
Please note that the Java code works when using JInit 1.1.8.19 (after manually updating identity.obj with the signing identity).
Any assistance, would be much appreciated.
Regards
Marc Ludwig

Answer 1

Hi Duncan,
I have cleared out the cache, tried re-installing etc. but continue to get the exception.
Apologies for the length, but I attach the "hostcommand" Java code.
// Copyright (c) 2002 Aquila Group Holdings Ltd
package uk.co.aquilauk;
import java.util.*;
import java.text.*;
import java.io.*;
import oracle.forms.ui.*;
import oracle.forms.properties.*;
import oracle.forms.handler.*;
* <code>HostCommand</code> is an Oracle Forms Pluggable Java Component that provides access to the client
* machine allowing administrator web forms to run executables<P>
* <P>The class will need to be signed before being used since access to the client machine
* is an activity that is defined outside of the default Java sandbox.</P>
* <!-- RevisionInformation -->
* <DL><DT><B>Revision Information:</B></DL>
* <pre>
* Nick Holcombe 30/11/2001 Initial revision.
* Nick Holcombe 04/12/2001 Added JavaDocs comments.
* Marc Ludwig 03/01/2002 Added call to StreamGobbler to handle standard error and input streams.
* </pre>
* <!-- End RevisionInformation -->
public class HostCommand extends VBean {
* Stores the handler for this view class
IHandler mHandler = null;
// Return codes from host command
static final int RC_CMDNOTRUN = -1;
static final int RC_CMDERROR = -2;
static final int RC_CMDNOTFINISHED = -3;
* Register custom properties, used to invoke the setProperty/getProperty JavaBean methods
static final ID P_MODAL = ID.registerProperty("MODAL");
static final ID P_RETURNCODE = ID.registerProperty("RETURNCODE");
static final ID P_NEWCOMMAND = ID.registerProperty("newCommand");
static final ID P_ADDCOMMAND = ID.registerProperty("addCommand");
static final ID P_RUNCOMMAND = ID.registerProperty("runCommand");
private boolean modal = false;
private int returnCode = RC_CMDNOTRUN;
private Vector cmdArray = new Vector();
private Process commandProcess = null;
private boolean commandHasRun = false;
private boolean isCommandStillRunning () {
if (commandHasRun)
return false;
try {
int ev = commandProcess.exitValue();
commandHasRun = true;
returnCode = ev;
catch (java.lang.IllegalThreadStateException e) {
return true;
return false;
private String getReturnCode () {
if (isCommandStillRunning()) {
return ""+RC_CMDNOTFINISHED;
else if (commandHasRun) {
return ""+returnCode;
else {
return ""+RC_CMDNOTRUN;
private String getModal () {
if (modal)
return "TRUE";
else
return "FALSE";
private boolean setModal (Object value) {
String newModal = (String) value;
if (newModal.equals ("TRUE"))
modal = true;
else
modal = false;
return true;
private String newCommandArray () {
cmdArray = new Vector();
return "";
private boolean addCommandArray (Object value) {
String cmdEntry = (String) value;
if (cmdArray == null) {
cmdArray = new Vector();
System.err.println ("HostCommand.addCommandArray: Adding command "+cmdEntry);
cmdArray.addElement (cmdEntry);
return true;
private String runCommandArray () {
execCommandArray();
return (getReturnCode());
private boolean execCommandArray () {
returnCode = RC_CMDNOTRUN;
commandHasRun = false;
commandProcess = null;
String cmd[] = new String[cmdArray.size()];
int count = 0;
try {
if (cmdArray != null && cmdArray.size() > 0) {
for (Enumeration e = cmdArray.elements() ; e.hasMoreElements() ;) {
String cmdElement = (String) e.nextElement();
cmd[count++] = cmdElement;
commandProcess = Runtime.getRuntime().exec(cmd);
StreamGobbler errorGobbler = new StreamGobbler(commandProcess.getErrorStream(), "ErrStream");
StreamGobbler outputGobbler = new StreamGobbler(commandProcess.getInputStream(), "OutStream");
errorGobbler.start();
outputGobbler.start();
if (modal) {
returnCode = commandProcess.waitFor();
commandHasRun = true;
catch (Exception x) {
x.printStackTrace();
returnCode = RC_CMDERROR;
commandHasRun = true;
return false;
return true;
* Method in the IView interface that is called when the component is first
* initialised from by the Forms Server.
* @param a reference to the Handler object for this class
public void init(IHandler handler)
mHandler = handler;
commandProcess = null;
returnCode = RC_CMDNOTRUN;
commandHasRun = false;
cmdArray = new Vector();
* Method in the IView interface that is called when the Forms Server wishes to
* obtain the value of a specific property from the class.
* For the 6i release, the get_custom_property method will be available which will
* allow for a far simple usage model. The Form developer will simply be able to call
* get_custom_property('HOSTCOMMAND') and we will return the host command as a string.
* @param pid the property to be returned
* @return the value of the property that was requested
public Object getProperty(ID pid)
if (pid == P_MODAL) {
return (getModal ());
else if (pid == P_RETURNCODE) {
return (getReturnCode ());
else if (pid == P_NEWCOMMAND) {
return (newCommandArray());
else if (pid == P_RUNCOMMAND) {
return (runCommandArray());
else // let the VBean superclass handle the other properties
return(super.getProperty(pid));
public boolean setProperty (ID pid, Object value) {
boolean result = true;
if (pid == P_MODAL) {
result = setModal (value);
else if (pid == P_ADDCOMMAND) {
result = addCommandArray (value);
else
result = super.setProperty (pid, value);
return result;
* A convenience function to use the new ID.getName() method exposed in the 6i
* release but which will still allow the PJC to be used in the 6.0 release
* @param pid the property to display the name of
* @return the property name
public String getPropertyName(ID pid)
try
return pid.getName();
// if there is an exception, it's 6.0 running!
catch(Exception e)
return null;
* The test method which allows class to be run from the command line to determine
* if it is functioning correctly.
* @param args[] the command line arguments
public static void main(String args[])
String commandToRun = "";
if (args.length == 0) {
System.err.println("usage: hostcommand Command to run");
System.exit(1);
HostCommand hc = new HostCommand();
hc.getProperty (P_NEWCOMMAND);
if (args.length > 0) {
for (int i = 0; i<args.length; i++) {
commandToRun += args[i]+" ";
hc.setProperty (P_ADDCOMMAND, args);
System.out.println("CommandtoRun: >"+commandToRun+"<");
hc.setProperty (P_MODAL, "TRUE"); // Make the test example modal
String rc = (String) hc.getProperty (P_RUNCOMMAND); // Run the command, getting the return code
System.err.println("rc="+rc); // Display the return code
// Regardless of the modal property, wait until the command has finished before the return code
// is retrieved, otherwise a -3 will be returned if the process is still running.
if (hc.getReturnCode().equals(""+RC_CMDNOTFINISHED)) {
System.err.println ("CommandNotFinished. Waiting for command to finish to get the return code");
while (hc.getReturnCode().equals(""+RC_CMDNOTFINISHED)) {
System.err.println("ReturnCode: "+hc.getProperty (P_RETURNCODE)); // Display the return code
System.exit(0);
// Copyright (c) 2002 Aquila Group Holdings Ltd
package uk.co.aquilauk;
import java.util.*;
import java.io.*;
* <code>StreamGobbler</code> is a public class that is currently called from the HostCommand class, to control output
* and error streams produced when calling Host commands from the JVM.
* <!-- RevisionInformation -->
* <DL><DT><B>Revison Information:</B></DL>
* <pre>
* Marc Ludwig 03/01/2002 Initial revision.
* </pre>
* <!-- End RevisionInformation -->
public class StreamGobbler extends Thread {
InputStream is;
String type;
StreamGobbler(InputStream is, String type) {
this.is = is;
this.type = type;
public void run() {
try {
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String line=null;
while ( (line = br.readLine()) != null)
System.err.println(type + ": " + line);
catch (IOException ioe) {
ioe.printStackTrace();
Hope you are able to help. As mentioned previously, this same code works successfully when using JINIT 1.1.8.19 after manually updating the JInit identity.obj with our sigining identity.
Regards
Marc Ludwig