problem with applet and twitter4j stream

Integration and Hardware

v.k.

problem with applet and twitter4j stream

in Integration and Hardware • 9 months ago

I got this java error with a PApplet using twitter4j stream. I've signed all jars. Any clue? thanks

the applet is here:

http://kubrusly.com/vicente/twt/

the error (the bold is mine) :

java.lang.reflect.InvocationTargetException

at com.sun.deploy.util.DeployAWTUtil.invokeAndWait(DeployAWTUtil.java:116)

at sun.plugin2.applet.Plugin2Manager.runOnEDT(Plugin2Manager.java:3541)

at sun.plugin2.applet.Plugin2Manager.createApplet(Plugin2Manager.java:3072)

at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Plugin2Manager.java:1497)

at java.lang.Thread.run(Thread.java:680)

Caused by: java.lang.SecurityException: class "twitter4j.StatusListener" does not match trust level of other classes in the same package

at com.sun.deploy.security.CPCallbackHandler$ChildElement.checkResource(CPCallbackHandler.java:489)

at com.sun.deploy.security.DeployURLClassPath$JarLoader.checkResource(DeployURLClassPath.java:853)

at com.sun.deploy.security.DeployURLClassPath$JarLoader.getResource(DeployURLClassPath.java:926)

at com.sun.deploy.security.DeployURLClassPath.getResource(DeployURLClassPath.java:238)

at sun.plugin2.applet.Plugin2ClassLoader$2.run(Plugin2ClassLoader.java:969)

at java.security.AccessController.doPrivileged(Native Method)

at sun.plugin2.applet.Plugin2ClassLoader.findClassHelper(Plugin2ClassLoader.java:958)

at sun.plugin2.applet.Applet2ClassLoader.findClass(Applet2ClassLoader.java:134)

at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Plugin2ClassLoader.java:249)

at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Plugin2ClassLoader.java:179)

at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Plugin2ClassLoader.java:160)

at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

at java.lang.Class.getDeclaredConstructors0(Native Method)

at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)

at java.lang.Class.getConstructor0(Class.java:2699)

at java.lang.Class.newInstance0(Class.java:326)

at java.lang.Class.newInstance(Class.java:308)

at sun.plugin2.applet.Plugin2Manager$13.run(Plugin2Manager.java:3060)

at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:199)

at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:702)

at java.awt.EventQueue.access$400(EventQueue.java:82)

at java.awt.EventQueue$2.run(EventQueue.java:663)

at java.awt.EventQueue$2.run(EventQueue.java:661)

at java.security.AccessController.doPrivileged(Native Method)

at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:672)

at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)

at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)

at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

Replies(7)

PhiLho

Re: problem with applet and twitter4j stream

9 months ago

http://docs.oracle.com/javase/6/docs/technotes/guides/jweb/mixed_code.html
http://stackoverflow.com/questions/10905790/java-7u4-webstart-security-exception-class-does-not-match-trust-level is also interesting, although I don't know if it applies to your configuration.

I found these by searching "does not match trust level of other classes in the same package", you can probably find other relevant pages.

BTW, applet-specific issues belong to this section, not to Programming questions, even less without showing code (and anyway, it would have belonged to Contributed libraries section).

v.k.

Re: problem with applet and twitter4j stream

9 months ago

Thanks for your help. By reading the links you posted I found that the problem with that error was me signing the library jars, so i started over without signing any jar and got rid of it. But now i'm getting the applet loaded, but with this error:

java.security.AccessControlException: access denied (java.util.PropertyPermission twitter4j.loggerFactory read)

any idea?

Sorry for the wrong section.

PhiLho

Re: problem with applet and twitter4j stream

8 months ago

No problem for the section, my remarks aim to educate, not to lecture...

And you might have some issue with the library trying to log some information (warning, error...) and not finding properties (expected to be on a disk the applet cannot access, or at a location not accessible on the computer it is running on) describing the logging activity.
This is guessed from the line you give, so I can be wrong.
Try and see if you can deactivate any logging with this library.

v.k.

Re: problem with applet and twitter4j stream

8 months ago

Well i think i was able to deactivate logging as the error i get has changed... Now i get this:

java.security.AccessControlException: access denied (java.util.PropertyPermission java.io.tmpdir read)

I had in code a hack that needed to write to a temp directory to deal with images urls, but i got rid of it... And the error persists The code is a twitter sketch with twitter4j. Also i tried to change from OpenGL but the problem stills. I'm not using java.util as far as i know. I know that applets are getting harder to use, but as this is deppending on libraries i need to put it online by applet. Any idea?

this is the full log;

network: ResponseCode for http://download.java.net/media/applet-launcher/applet-launcher.jar : 304
network: Encoding for http://download.java.net/media/applet-launcher/applet-launcher.jar : null
network: Disconnect connection to http://download.java.net/media/applet-launcher/applet-launcher.jar
cache: Reading Signers from 0 http://download.java.net/media/applet-launcher/applet-launcher.jar | /Users/vk/Library/Caches/Java/cache/6.0/41/4e6fb429-39d14e0f.idx
network: No certificate info for unsigned JAR file: http://download.java.net/media/applet-launcher/applet-launcher.jar
network: No certificate info for unsigned JAR file: http://download.java.net/media/applet-launcher/applet-launcher.jar
cache: Read manifest for http://download.java.net/media/applet-launcher/applet-launcher.jar: read=22 full=22
JNLPAppletLauncher: static initializer
os.name = mac os x
nativePrefix = lib nativeSuffix = .jnilib
java.security.AccessControlException: access denied (java.util.PropertyPermission java.io.tmpdir read)
at java.security.AccessControlContext.checkPermission(AccessControlContext.java:374)
at java.security.AccessController.checkPermission(AccessController.java:546)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
at java.lang.SecurityManager.checkPropertyAccess(SecurityManager.java:1285)
at java.lang.System.getProperty(System.java:667)
at org.jdesktop.applet.util.JNLPAppletLauncher.initTmpRoot(JNLPAppletLauncher.java:1000)
at org.jdesktop.applet.util.JNLPAppletLauncher.<clinit>(JNLPAppletLauncher.java:2110)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at java.lang.Class.newInstance0(Class.java:355)
at java.lang.Class.newInstance(Class.java:308)
at sun.plugin2.applet.Plugin2Manager$13.run(Plugin2Manager.java:3060)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:199)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:702)
at java.awt.EventQueue.access$400(EventQueue.java:82)
at java.awt.EventQueue$2.run(EventQueue.java:663)
at java.awt.EventQueue$2.run(EventQueue.java:661)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:672)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
basic: Applet loaded.
basic: Applet resized and added to parent container
basic: PERF: AppletExecutionRunnable - applet.init() BEGIN ; jvmLaunch dt 267197 us, pluginInit dt 5507729 us, TotalTime: 5774926 us
Applet.init
basic: Applet initialized
basic: Applet made visible
basic: Starting applet
basic: completed perf rollup
Applet.start
basic: Applet started
basic: Told clients applet is started

v.k.

Re: problem with applet and twitter4j stream

8 months ago

I bumped into this at stackoverflow , its a similar error with an applet. It is beyond my fully understanding but is about making a custom SecurityManager ??? Well does any one can tell if this is a possible solution for Proccesing applets? The comments are about a risky exposure, apparently manageable, but even though, for testing at least could be interesting. Also someone (other site) pointed to a .htaccess tweak does it make any sense?

the code there goes like:

private class MySecurityManager extends SecurityManager {
    @Override
    public void checkPermission(Permission perm) {
        return;
    }
}

It is a neglected security manager that accepts all permissions. It should be improved allowing only getting system ClassLoader in runtime.

To use my ugly SecurityManager I added these lines at the beginning of Java Applet start() method:

SecurityManager sm = new MySecurityManager();
System.setSecurityManager(sm);

PhiLho

Re: problem with applet and twitter4j stream

8 months ago

Don't forget applets go into the Java cache. When you change your code, you have to clear the cache, as these changes aren't always detected. So the code you removed might be still executed...
That might also be the reason I see a mention of unsigned jars...

v.k.

Re: problem with applet and twitter4j stream

8 months ago

No, this is cause i have not signed them, as mentioned above. Signing leads me to Caused by: java.lang.SecurityException: class "twitter4j.StatusListener" does not match trust level of other classes in the same package, so i uploaded an unsigned version and got those new ones :-). U think i must sign only my code? and not the twitter4j jars?

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