I have a simple servlet which looks like like below. Ite uses the Google's User Service. When I don't use it I don't get any errors. Also I get an entire list of error as below. I turn out that this was an Eclipse Known Issue but I can't find the solution.
import java.io.IOException;
import javax.servlet.http.*;
import com.google.appengine.api.users.User;
import com.google.appengine.api.users.UserService;
import com.google.appengine.api.users.UserServiceFactory;
#SuppressWarnings("serial")
public class GuestbookServlet extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws IOException {
UserService userService = UserServiceFactory.getUserService();
User user = userService.getCurrentUser();
if (user != null) {
resp.setContentType("text/plain");
resp.getWriter().println("Hello, " + user.getNickname());
} else {
resp.sendRedirect(userService.createLoginURL(req.getRequestURI()));
}
}
}
These are the first errors:
HTTP ERROR 500
Problem accessing /guestbook. Reason:
Expecting a stackmap frame at branch target 117 in method guestbook.GuestbookServlet.doGet(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;)V at offset 34
Caused by:
java.lang.VerifyError: Expecting a stackmap frame at branch target 117 in method guestbook.GuestbookServlet.doGet(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;)V at offset 34
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
at java.lang.Class.getConstructor0(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:153)
at org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:428)
at org.mortbay.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:339)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
Is the problem from the Java version? I am running Eclipse Indigo and Java 7. What should I do
This seems to be a known eclipse issue with JDK7. Please check this link for workaround/solution.
Related
Im trying to run code use protege-owl. So I added the protege.jar and protege-owl.jar to library to import edu.stanford.smi.protegex.owl.* and edu.stanford.smi.protege.*.
I also added jena jar files to use in next steps.
First i wrote simple code to see how it works :
import java.lang.Object;
import edu.stanford.smi.protege.*;
import edu.stanford.smi.protegex.owl.*;
import edu.stanford.smi.protegex.owl.jena.JenaOWLModel;
import edu.stanford.smi.protegex.owl.model.OWLNamedClass;
public class Main {
public static void main(String[] args) {
// TODO code application logic here
JenaOWLModel model=ProtegeOWL.createJenaOWLModel();
OWLNamedClass c= model.createOWLNamedClass("A");
System.out.print(c.getName());
}
}
But it gives me this error :
CONFIG: Protege 3.0 Build 141, JVM 1.6.0_20-b02, memory=259M, Windows 7, encoding=UTF-8, language=fa, country=IR
WARNING: Look and feel not found: com.jgoodies.plaf.plastic.PlasticLookAndFeel -- SystemUtilities.loadLookAndFeel()
WARNING: Plugins directory not found: C:\Users\mona\Documents\NetBeansProjects\JavaApplication3\plugins -- PluginUtilities.getPluginsDir()
WARNING: Exception Caught -- java.lang.NoClassDefFoundError: com/toedter/calendar/JDateChooser
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at edu.stanford.smi.protege.plugin.PluginUtilities.isLoadableClass(Unknown Source)
at edu.stanford.smi.protege.plugin.PluginUtilities.checkPlugin(Unknown Source)
at edu.stanford.smi.protege.plugin.PluginUtilities.checkPlugins(Unknown Source)
at edu.stanford.smi.protege.plugin.PluginUtilities.processManifest(Unknown Source)
at edu.stanford.smi.protege.plugin.PluginUtilities.loadPluginsWithClassLoader(Unknown Source)
at edu.stanford.smi.protege.plugin.PluginUtilities.createClassLoaderAndLoadPlugins(Unknown Source)
at edu.stanford.smi.protege.plugin.PluginUtilities.loadPlugins(Unknown Source)
at edu.stanford.smi.protege.plugin.PluginUtilities.loadSystemPlugins(Unknown Source)
at edu.stanford.smi.protege.plugin.PluginUtilities.loadPlugins(Unknown Source)
at edu.stanford.smi.protege.plugin.PluginUtilities.init(Unknown Source)
at edu.stanford.smi.protege.plugin.PluginUtilities.<clinit>(Unknown Source)
at edu.stanford.smi.protege.util.SystemUtilities.init(Unknown Source)
at edu.stanford.smi.protege.util.SystemUtilities.<clinit>(Unknown Source)
at edu.stanford.smi.protege.model.Project.<clinit>(Unknown Source)
at edu.stanford.smi.protegex.owl.ProtegeOWL.createJenaOWLModel(ProtegeOWL.java:32)
at javaapplication3.Main.main(Main.java:25)
Caused by: java.lang.ClassNotFoundException: com.toedter.calendar.JDateChooser
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method) . . . .
What can I do ?
Update:
I replace protege.jar with protege-3.5.jar and now it gives :
Exception in thread "main" java.lang.NoSuchMethodError: edu.stanford.smi.protege.model.SystemFrames.replaceFrame(Ledu/stanford/smi/protege/model/Frame;)V
at edu.stanford.smi.protegex.owl.model.impl.AbstractOWLModel.createSystemFrames(AbstractOWLModel.java:544)
at edu.stanford.smi.protege.model.DefaultKnowledgeBase.<init>(DefaultKnowledgeBase.java:79)
at edu.stanford.smi.protegex.owl.model.impl.AbstractOWLModel.<init>(AbstractOWLModel.java:318)
at edu.stanford.smi.protegex.owl.jena.JenaOWLModel.<init>(JenaOWLModel.java:62)
at edu.stanford.smi.protegex.owl.jena.JenaKnowledgeBaseFactory.createKnowledgeBase(JenaKnowledgeBaseFactory.java:55)
at edu.stanford.smi.protege.model.Project.createDomainKB(Project.java:429)
at edu.stanford.smi.protege.model.Project.createDomainKnowledgeBase(Project.java:447)
at edu.stanford.smi.protege.model.Project.<init>(Project.java:359)
at edu.stanford.smi.protege.model.Project.<init>(Project.java:341)
at edu.stanford.smi.protege.model.Project.createNewProject(Project.java:545)
at edu.stanford.smi.protegex.owl.ProtegeOWL.createJenaOWLModel(ProtegeOWL.java:32)
at javaapplication3.Main.main(Main.java:24)
Java Result: 1
Where is the problem?
I downloaded protege-owl.jar which is 3.24MB from different link and now it works.
I am following Head First EJB. I know it has EJB 2.0 which is old as now EJB 3.1 is in. But I consider Head first book a good book for learning for amateurs like us.
I am using J2ee 1.3.1 RI and jdk 1.4. I ran the "deploy" tool to deploy by EJB and now I have a ejb client JAVA program given below:
import javax.naming.*;
import java.rmi.*;
import javax.rmi.*;
import headfirst.*;
import javax.ejb.*;
import java.util.*;
public class AdviceClient {
public static void main(String[] args){
new AdviceClient().go();
}
public void go(){
try{
Properties props=new Properties();
props.setProperty(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.rmi.registry.RegistryContextFactory");
//props.setProperty(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.fscontext.RefFSContextFactory");
//env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.rmi.registry.RegistryContextFactory");
//props.setProperty(Context.INITIAL_CONTEXT_FACTORY,"com.sun.enterprise.naming.SerialInitContextFactory");
props.setProperty(Context.PROVIDER_URL,"rmi://localhost:1050");
//props.setProperty("java.naming.provider.url","rmi://localhost:1099");
Context ic = new InitialContext(props);
Object o = ic.lookup("Advisor");
AdviceHome home = (AdviceHome)PortableRemoteObject.narrow(o,AdviceHome.class);
Advice advisor = home.create();
System.out.println(advisor.getAdvice());
}
catch(Exception ex){
ex.printStackTrace();
}
}
}
Following the book, I compiled the program. The "Properties" part is something not mentioned in the example. I got it from some other examples on the web. Now, that when I am executing the client, am getting the following error:
F:\EJBProject\advice>java -classpath AdviceAppClient.jar;. AdviceClient
javax.naming.CommunicationException [Root exception is java.rmi.ConnectIOException: error during JRMP connection establishment; nested exception is:
java.net.SocketTimeoutException: Read timed out]
at com.sun.jndi.rmi.registry.RegistryContext.lookup(Unknown Source)
at com.sun.jndi.rmi.registry.RegistryContext.lookup(Unknown Source)
at javax.naming.InitialContext.lookup(Unknown Source)
at AdviceClient.go(AdviceClient.java:26)
at AdviceClient.main(AdviceClient.java:11)
Caused by: java.rmi.ConnectIOException: error during JRMP connection establishment; nested exception is:
java.net.SocketTimeoutException: Read timed out
at sun.rmi.transport.tcp.TCPChannel.createConnection(Unknown Source)
at sun.rmi.transport.tcp.TCPChannel.newConnection(Unknown Source)
at sun.rmi.server.UnicastRef.newCall(Unknown Source)
at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
... 5 more
Caused by: java.net.SocketTimeoutException: Read timed out
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at java.io.BufferedInputStream.fill(Unknown Source)
at java.io.BufferedInputStream.read(Unknown Source)
at java.io.DataInputStream.readByte(Unknown Source)
Please help. I am stuck up badly here. I wanted to sit for the OCBCD exam!
Regards,
Shouvanik
Finally Solved.
If you hit a roadblock while running the first EJB example simply follow these steps
to run the first example of HeadFirst EJB.
Softwares
1. j2sdk1.4.1 - jdk
2. j2sdkee1.3.1 - j2ee RI
3. CMD (command prompt)
Compile all the classes using c:\j2sdkee1.3.1\lib\j2ee.jar library.
Now, create a App and deploy EJB inside RI. download the application client as shown in the book.
Now, comes the tricky part.
Compile client class using the following jars
javac -classpath AdviceAppClient.jar;c:\j2sdkee1.3.1\lib\j2ee.jar AdviceClient.java
Next, run the client as follows
java -cp AdviceAppClient.jar;c:\j2sdkee1.3.1\lib\j2ee.jar;c:\j2sdk1.4.1\jre\lib\rt.jar;. AdviceClient
I am having trouble getting the Google Web Toolkit's History class to work in Internet Explorer, even though it works in Chrome, FF.
I created an app using GWT 2.0 about 12 months ago, and noticed it stopped working sometime. I stripped it back to just the very first class and it seems any time I call History.addValueChangeHandler, Internet Explorer crashes.
Here is the code:
package com.js.client;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.user.client.History;
/**
* Entry point classes define <code>onModuleLoad()</code>.
*/
public class Test implements EntryPoint, ValueChangeHandler<String>
{
/**
* This is the entry point method.
*/
public void onModuleLoad() {
History.addValueChangeHandler(this);
History.fireCurrentHistoryState();
}
public void onValueChange(ValueChangeEvent<String> event) {
Label loading = new Label( "Loading..." );
RootPanel.get().add( loading );
}
}
It's hard to believe this could crash, but here is the error:
18:50:52.407 [ERROR] [test] Unable to load module entry point class com.js.client.Test (see associated exception for details)
com.google.gwt.core.client.JavaScriptException: (Error): Access is denied.
description: Access is denied.
number: -2147024891
at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:195)
at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:120)
at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:507)
at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:264)
at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
at com.google.gwt.user.client.impl.HistoryImplIE6.getTokenElement(HistoryImplIE6.java)
at com.google.gwt.user.client.impl.HistoryImplIE6.init(HistoryImplIE6.java:80)
at com.google.gwt.user.client.History.<clinit>(History.java:63)
at com.js.client.Test.onModuleLoad(Test.java:24)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.dev.shell.ModuleSpace.onLoad(ModuleSpace.java:369)
at com.google.gwt.dev.shell.OophmSessionHandler.loadModule(OophmSessionHandler.java:185)
at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:380)
at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:222)
at java.lang.Thread.run(Unknown Source)
Any help would be appreciated. Thanks!
Is this IE7? Are you using a JSP/Servlet to render your home page? If yes ensure your servlet generates the history iframe/script code with double quotes and not single quotes.
I am trying to call an sighned applet on by GWT button click. I tried going through the gwtai method of creating an interface on client side then writing an Applet which implements the interface.Howevere I get a TargetInvokationException when I call the method on my onClick() event.
Here is the code I wrote :
screenCap.addListener(new ButtonListenerAdapter() {
public void onClick(Button button, EventObject e) {
String filePath = counterApplet.captureScreenShot(); (Throws exception here)
TextField filePathT = new TextField();
My Applet Interface :
import com.google.gwt.gwtai.applet.client.*;
#ImplementingClass(com.jpmorgan.rd.querymanager.applet.imageCaptureAppletImpl.class)
#Height("10")
#Width("10")
#Archive("GwtAI-Client.jar,GwtAI-Demo.jar")
public interface imageCaptureApplet extends Applet {
String captureScreenShot();
}
My applet implementation class :
import java.awt.*;
import javax.swing.JApplet;
public class imageCaptureAppletImpl extends JApplet implements imageCaptureApplet{
private static final long serialVersionUID = -511774647966368672L;
public String captureScreenShot() {
String file;
// do something
return file;
}
And the full stack trace:
load: class com.amol.test.imageCaptureAppletImpl.class not found.
java.lang.ClassNotFoundException: com.jpmorgan.rd.querymanager.server.imageCaptureAppletImpl.class
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 sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed:http://127.0.0.1:8888/com/amol/test/imageCaptureAppletImpl/class.class
at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 9 more
Exception: java.lang.ClassNotFoundException: com.amol.test.imageCaptureAppletImpl.class
Any help around this is Appreciated.
I have also created a signed jar of my applet can you please suggest if there is a better way of calling this captureScreenShot() method from my GWT page on button click and getting a result back.
Also is JSNI a better way of doing this. If so can you show a example where a applet which passes a value back is called.
Many thanks in advanced.
PS: I used this page for the basis of my code on gwtai :
http://code.google.com/p/gwtai/wiki/GettingStarted
Thanks,
Amol
GwtAI is using JSNI to communicate with the applet. So whether you are writing the JSNI code yourself or using this library will be the same. Can you post the full stacktrace of your error?
I want to convert an java application to applet, but I an having problems to load it in the browser I presume this is because of the package.
package com.applet;
import java.applet.Applet;
import javax.swing.JApplet;
import javax.swing.SwingUtilities;
//import javax.swing.JOptionPane;
#SuppressWarnings("serial")
public class AppletDriver extends Applet {
//Called when this applet is loaded into the browser.
public void init() {
//Execute a job on the event-dispatching thread; creating this applet's GUI.
try {
SwingUtilities.invokeAndWait(new Runnable() {
public void run() {
CleanerPanel cFrame = new CleanerPanel();
add(cFrame);
}
});
} catch (Exception e) {
System.err.println("createGUI didn't complete successfully");
}
}
}
this is the code I am using to call the applet when I run it in Eclipse it is working.
this is the html code:
<applet archive="app.jar" code="bin/com/applet/AppletDriver.class" width=350 height=200>
</applet>
the app.jar is in the main dir of the eclipse project any suggestions ?
error from browser java console:
java.lang.NoClassDefFoundError: bin/com/applet/AppletDriver (wrong name: com/applet/AppletDriver)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Exception: java.lang.NoClassDefFoundError: bin/com/applet/AppletDriver (wrong name: com/applet/AppletDriver)
Remove the bin\ from the start of the code attribute value, and use / instead of \ (we're not in Washington anymore). If the jar is in a directory named bin then you'll need to use archive="bin/app.jar".
Actually looking at the stack trace, the jar has been constructed incorrectly. The class file should be in a directory com/applet, not bin/com/applet.