I can't run Applets - Beginner Question

I have installed J2sdk1.4.1 and have changed my path to include c:\J2sdk1.4.1\bin\ and have messed with CLASSPATH a bunch. My files will work though javac but when I try run an applet nothing will display. I get a big "x". I have M$ IE5.5 and windows NT 4.0. I have every java option in the options turned -ON-.
Can anyone help?
Hutch

Is it complile clearly?
Then check HTML code is ok?
If u r use applet viewer,I think that is the best way to check the applet.

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Can't run applet with appletviewer(java.io.FilePermission)

Guys, I am writing an applet and it has compiled fine but when I try running it with appletviewer, it spews out these error. I have changed permissions on my .class file and .html file.
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ava.security.AccessControlException: access denied (java.io.FilePermission /.automount/blah/usr/blah/blah/Node.class read)
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Can't run applet after mac os x upgrade

hello,
I have trouble running a simple java applet on my mac os X laptop .ie:double click on jar file, opens up but nothing happens
The problem started when I upgraded my laptop to 10.2.5
[c18339:~] fred% java -version
java version "1.4.1_01"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1_01-39)
Java HotSpot(TM) Client VM (build 1.4.1_01-14, mixed mode)
The error message when i try to run the applet:
fred% java -jar mindterm.jar
2003-05-18 08:57:57.295 java[898] Font 04b-20: descent is 0.
Exception in thread "main" java.lang.ExceptionInInitializerError
at com.mindbright.application.MindTerm.initGUI(Unknown Source)
at com.mindbright.application.MindTerm.run(Unknown Source)
at com.mindbright.application.MindTerm.main(Unknown Source)
Caused by: java.lang.NullPointerException
at sun.java2d.SunGraphicsEnvironment.getAvailableFontFamilyNames(SunGraphicsEnvironment.java:327)
at sun.java2d.SunGraphicsEnvironment.getAvailableFontFamilyNames(SunGraphicsEnvironment.java:359)
at apple.awt.CToolkit.getFontList(CToolkit.java:901)
at com.mindbright.terminal.o.a(Unknown Source)
at com.mindbright.terminal.o.do(Unknown Source)
at com.mindbright.terminal.o.<clinit>(Unknown Source)
... 3 more
Is there something wrong with Java shipped with 10.2.5, it was working
great on 10.1
regards
frederic
http://www.dab.uts.edu.au

Just a guess, but did the applet come with any fonts?

Firefox ( =1.0.5) + Java Plugin (1.4.2_08) can't run applets

Hi
I'm using gentoo linux and i've been using firefox with the sun java plugin for some time without any problems. however, in the last few weeks there suddenly appeared the following problem with the java plugin:
Whenever I try to open a page with an applet, there is the java logo, and after some time, there's a red "X" in the place of the applet. When I subsequently open the java console, I always get the same error message (Encyclo.class contains the applet):
java.lang.ClassNotFoundException: Encyclo.class
     at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:162)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
     at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:123)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
     at sun.applet.AppletClassLoader.loadCode(AppletClassLoader.java:566)
     at sun.applet.AppletPanel.createApplet(AppletPanel.java:619)
     at sun.plugin.AppletViewer.createApplet(AppletViewer.java:1879)
     at sun.applet.AppletPanel.runLoader(AppletPanel.java:548)
     at sun.applet.AppletPanel.run(AppletPanel.java:299)
     at java.lang.Thread.run(Thread.java:534)
Caused by: java.net.ConnectException: Invalid argument
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     at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:305)
     at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:171)
     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:158)
     at java.net.Socket.connect(Socket.java:452)
     at sun.net.NetworkClient.doConnect(NetworkClient.java:137)
     at sun.plugin.net.protocol.http.HttpClient.doConnect(HttpClient.java:106)
     at sun.net.www.http.HttpClient.openServer(HttpClient.java:402)
     at sun.net.www.http.HttpClient.openServer(HttpClient.java:618)
     at sun.net.www.http.HttpClient.<init>(HttpClient.java:306)
     at sun.net.www.http.HttpClient.<init>(HttpClient.java:267)
     at sun.plugin.net.protocol.http.HttpClient.<init>(HttpClient.java:41)
     at sun.plugin.net.protocol.http.HttpClient.New(HttpClient.java:62)
     at sun.plugin.net.protocol.http.HttpURLConnection.createConnection(HttpURLConnection.java:101)
     at sun.plugin.net.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:158)
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     at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:272)
     at sun.applet.AppletClassLoader.getBytes(AppletClassLoader.java:263)
     at sun.applet.AppletClassLoader.access$100(AppletClassLoader.java:43)
     at sun.applet.AppletClassLoader$1.run(AppletClassLoader.java:152)
     at java.security.AccessController.doPrivileged(Native Method)
     at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:149)
     ... 9 more
I have no Idea what could be wrong. Please help.

One of my colleagues found a workaround.
This problem is maybe related to selinux.
If you disable selinux, applets will work well.
[ To disable selinux find the line beginning with "SELINUX="
in your /etc/sysconfig/selinux file and change it to "SELINUX=disabled".
And then you perhaps have to reboot. ]
HTH:
B�lint

I can't get applets to run - I messed up machine

This is not a programming question, just an "I want to see an applet" question.
2 months ago, I downloaded the JDK 1.3.1_02 because I was/am taking a programming class. I set the path variable to the BIN. I then had 2 runtime environments 1.3.1 and 1.3.1_02 and everything was fine. Last week, however, applets wouldn't load or would load only after a very long delay (not necessarily my applets, just applets when we surfed the net). I twice received errors that my "client was corrupted."
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Should I reinstall Java and the runtime environment?
Thanks in advance Janie

Hi,
I've also encountered a problem in running applets and what I did are the following:
- Try reinstalling your Java and then restart your machine.
- After that, Go to Start -> Settings -> Control Panel -> Java Plug-in 1.3.1_02 to open the Java
Console Window.
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Cleo

Applet can not run in browser, but it wroks in appetviewer. Why?

I wrote a very simple applet, and it works well when I use appletviewer. But when I use browser to open the html file which contains the applet, it always gives no class found error. My browsers are IE5.0 and Netscape4.77. Hwo can I make the applet run in browser?
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see you have to put the proper code base in your html file.check if your browser is java enabled or not.Java plugin comes with IE 5 and it automatically get installed if you won't disagree with that.Check in optin menu of ur browser that java is enabled or not.
Applet works fine with all browser.
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Can't run JRE 1.2.2 applets once 1.4.1 installed

I have an applet developed with JDK 1.2.2 (uses 3rd-party jars) which was working perfectly with the 1.2.2 plug-in
that comes with the JDK.
The OBJECT tag specifies the dynamic versioning clsid clsid:8AD9C840-044E-11D1-B3E9-00805F499D93 (which is the
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However, when users who have downloaded the 1.4.1 plug-in run the applet (quite apart from the fact that I have had
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(this has been reproduced outside of the browser using JRE 1.4.1 because the 1.4.1 plug-in console won't display,
even after manually running the Console and setting the Show Console checkbox,
and the icon doesn't appear on the System menu, presumably all because I have JDK 1.2.2 + plug-in installed)
java.lang.ExceptionInInitializerError
at javax.crypto.Mac.getInstance(DashoA6275)
at com.baltimore.jpkiplus.pkcs12.PFX.fromASN1Object([DashoPro-V1.3-01300
0])
at com.baltimore.jpkiplus.pkcs12.PFX.fromBER([DashoPro-V1.3-013000])
at com.baltimore.jpkiplus.pkcs12.PFX.<init>([DashoPro-V1.3-013000])
at com.baltimore.jpkiplus.pkidevice.PKCS12Provider.openFile([DashoPro-V1
.3-013000])
at com.baltimore.jpkiplus.pkidevice.PKCS12Provider.openFile([DashoPro-V1
.3-013000])
at com.baltimore.jpkiplus.pkidevice.PKCS12Device.initInstance([DashoPro-
V1.3-013000])
at com.baltimore.jpkiplus.pkidevice.PKIDeviceManager.getPKIDevice([Dasho
Pro-V1.3-013000])
at com.baltimore.jpkiplus.vaults.Vault.a([DashoPro-V1.3-013000])
at com.baltimore.jpkiplus.vaults.Vault.openVault([DashoPro-V1.3-013000])
at mailsign.signer.signAndSend(signer.java:262)
at mailsign.AppletSigner.signAndSend(AppletSigner.java:329)
at mailsign.AppletSigner.action(AppletSigner.java:521)
at java.awt.Component.handleEvent(Unknown Source)
at java.awt.Component.postEvent(Unknown Source)
at java.awt.Component.postEvent(Unknown Source)
at java.awt.Component.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.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: java.lang.SecurityException: Cannot set up certs for trusted CAs
at javax.crypto.SunJCE_b.<clinit>(DashoA6275)
... 24 more
Caused by: java.lang.UnsupportedOperationException
at java.security.cert.CertificateFactorySpi.engineGenerateCertPath(Unkno
wn Source)
at java.security.cert.CertificateFactory.generateCertPath(Unknown Source
at javax.crypto.SunJCE_d.a(DashoA6275)
at javax.crypto.SunJCE_d.a(DashoA6275)
at javax.crypto.SunJCE_b.i(DashoA6275)
at javax.crypto.SunJCE_b.h(DashoA6275)
at javax.crypto.SunJCE_v.run(DashoA6275)
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... 25 more
In my opinion, this has something to do with the way service providers are handled. The 3rd party jar requires
a Security.insertProviderAt () call. My suspicion is that there is some kind of conflict with the JCE stuff
that comes bundled with JRE 1.4.1 to handle RSA signed applets. I found a similar conflict with the 1.2.2 JRE
when I tried to jarsign the 3rd-party libraries - I was getting, at runtime, either some kind of infinite loop hanging or
a stack overflow due to recursive function calls.
The fact that I can run the applet as a main and that I get the exact same error running the app from the DOS
prompt would indicate that this is a JRE 1.4.1 problem (surely the JREs are supposed to be downwardly-
compatible??!!! - i.e. the JRE 1.4 should run apps compiled with JDK 1.2.2 without any problem). Yes, I have
run the app as a main with JRE 1.2.2 and all works fine.
However, I could get around this if I could force the 1.2.2 plug-in to run instead of the 1.4.1 plug-in (quite
how the users are going to be able to get the 1.2.2 plug-in if they have plug-in 1.4.1 installed
without being Java experts is a problem I will leave
till later when I try to figure out how to make my applet an RSA signed applet (which if the documentation is
correct are only available from 1.3 onwards, hence solving this 1.4.1 problem would be VERY nice)).
But the problem is that once the 1.4.1 plug-in is installed, it always takes precedence over lower versions.
It's not obvious from the documentation whether older plug-in versions get executed when static versioning
is used for the clsid in the OBJECT tag. I can't be bothered to download a 1.3 plug-in and try.
However, unless I am mistaken, there is not a static versioning clsid for plug-in 1.2.2 ?????
In summary, once users download a plug-in version greater than 1.2.2 (presumably by running another applet from some
other site that requires eg 1.4.1 - I guess Sun's aim is to make the Plug-In as prevalent as possible, hence
this is not a far-fetched scenario), it is no longer possible for my applet to be run by a 1.2.2 JRE !!!!!!!
Because the 1.4.1 JRE is not downwardly-compatible, it can't run my 1.2.2-developed applet and my deployed
application is broke.
Unless I am missing something somewhere (which is possible because I am getting fed up of solving problem after
problem with the Plug-In - eg the mess of setting the right codebase to get different plug-ins to be downloaded
automatically - the HTML converter doesn't always set up the codebase correctly), this seems like a nightmare
for applet developers - from one day to the next your applications will break because of Sun's plug-in upgrading.
Please tell me there is a way to force the 1.2.2 JRE/plug-in to execute instead of 1.4.1 and that there is a
way for the 1.2.2 plug-in to be downloaded automatically by users even when they have 1.4.1 already installed.

Are you using signtool? I had a problem where applets stopped working when I went from JRE 1.3.1_01a to 1.3.1_07. I updated the signtool from 1.1 to 1.3 and now my applets run.
Mark

Applet can not run without JRE

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what wrong?
thanks

It is likely that the applet you compiled is using bytecode or features that the other machines don't recognize/have. If the other machines have the MS Java virtual machine but don't have the Sun virtual machine, try compiling the applet with the compiler option "-target 1.1" and see if that helps. It may, unless you used Java features that don't exist in Java 1.1 (for instance Swing classes). If so, then the other machines won't be able to run the applet unless they have the Sun jvm installed (like your machine).

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http://jfx.wikia.com/wiki/FAQ#What_is_needed_on_a_machine_to_run_JavaFX_applications.3F

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If your library was working on your computer and then popped up empty all of a sudden then this might be what you need...
Empty/corrupt library after upgrade/crash
Hopefully it's not been too long since you last upgraded iTunes, in fact if you get an empty/incomplete library immediately after upgrading then with the following steps you shouldn't lose a thing or need to do any further housekeeping. In the Previous iTunes Libraries folder should be a number of dated iTunes Library files. Take the most recent of these and copy it into the iTunes folder. Rename iTunes Library.itl as iTunes Library (Corrupt).itl and then rename the restored file as iTunes Library.itl. Start iTunes. Should all be good, bar any recent additions to or deletions from your library.
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tt2

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Numbers 09 'help' hasn't helped to this point.
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I can't run Applets - Beginner Question

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