I can't run an applet

When I run the sample applets that come with jdk1.4, the HTML code displays OK, but the applet part only shows a solid grey box.
Have any ideas why?

hi,
can you tell my your HTML code?
if you use<applet> tag,then your applet will not run,
beacause the iE or NS don't not support the jdk1.0 up!
so if you want run the applet ,there are two way:
1)
compile your code: javac -target 1.1 yourcode.java
2)
you can use the jre plug-in
first, edit your HTML code use <applet> tag
second,use the HTMLconverter(java_home/bin) tool convert the HTML code

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"Running an applet" means loading a HTML file that has another Applet tag. I assume this is what you want.
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ammon wrote:
wonder wrote:paste ~/.xinitrc
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these are java 2 security permissions you'll need to address ..
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Just as a matter of interest and i know its a stupid question, but did you create a html file to access the class file/jar
Here is some example code of an applet html page
Hope it helps...
Also have you put it in a Jar file?
<html>
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<TR>
<APPLET CODE = "ClassName.class" ARCHIVE = "JarName.jar" WIDTH = "800" HEIGHT = "600"></XMP>
<PARAM NAME = CODE VALUE = "ClassName.class" >
<PARAM NAME = ARCHIVE VALUE = "JarName.jar" >
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<PARAM NAME="scriptable" VALUE="false">
<dont worry about this>(they just variables for my applet)
<PARAM NAME = SERVER_IP VALUE ="192.1.1.209">
<PARAM NAME = SERVER_PORT VALUE =8701>
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<PARAM NAME = MESSAGE_TIMEOUT VALUE =60>
</dont worry about this>
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</body>
</html>

Make IE ready to run the applet in ubuntu machine

Dear friends,
I want to check JMF installation using diagnostic code in IE6/IE7 on ubuntu.
I have downloded these browsers. When I was checking the JMF installation, using this below URL,
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Note:
When I was checking this to windows xp ( IE) , it says below nmessages,
For JRE => jre Version... 1.5.0_10
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All Java Build
Native Libraries found success.
Thank you,

As an Applet does not have a method main, then obviously you need to convert it to an application, which does.

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?
Quick response is greatly appreciated.

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.
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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
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The OBJECT tag specifies the dynamic versioning clsid clsid:8AD9C840-044E-11D1-B3E9-00805F499D93 (which is the
only possibility for 1.2.2?).
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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)
at java.security.AccessController.doPrivileged(Native Method)
... 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

I have compiled the applet with J2SE 1.4.0. When I tested on the browser IE 5.0 in my computer, it could run because there is JRE included by J2SE 1.4.0 in my computer. When I tested in other computers, it can not run.the display only gray rectangle and there was a statement x.class is not found in bottom bar.The browser IE 5.0 is java enable. But when I access the webpage that include java application in the same computer without JRE, that could run.
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).

I can't run an applet

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