Reverted Java 6 plug-in stopped working

My Java 6 plug-in (reverted from Java 7) won't work anymore. I've used the reverted Java 6 plug-in for a couple of months but a couple of days ago it stopped working. I know that Apple blocked Java in Safari but it doesnt work in Firefox either.
I've reinstalled Java 6+Java 7u13 multiple times but still Java 6 won't work. I don't get any messages when trying to run applets, its just blanked, i.e. http://javatester.org/version.html doesn't show any information. Everything works fine with Java 7u13 but i have to use Java 6 because of some applications that runs on a platform that requires Java 6.
Anyone with the same problem?

I found my own solution to this one after many more hours of frustration. I found that there was a toolbar applet installed in Internet Explorer that started its own private JVM, and that JVM was being seen by the plugin code for 1.3.1_07. Apparently there was some conflict between what the plugin code expected and what that private JVM (not sure what version it was, the code had no mention of it) had to offer, which caused the crash dialog. Uninstalling the toolbar (and its parent application) solved the problem. I may do further testing to see if there are any plugin versions that do work with this particular applet.
It is also still a mystery why this problem only cropped up after installing and uninstalling 1.4.x version of the plugin, but I didn't keep close track of the whole sequence so it may have been coincidental.
Hope this helps someone.

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The recently released Java 7 Update 11 has been blocked by Apple through its XProtect anti-malware feature in OS X.
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Plug-in stopped working in Internet Explorer after upgrade to JDK 1.4.2

I've been struggling with this one for a week now with no success, hope someone can help. I have Windows 2000, SP4, IE5.5, everything was working fine with the initial installation of JRE 1.3.2, then upgrades to 1.3.4, 1.3.7, 1.4.1 and finally 1.4.2. An applet forced an install of 1.3.1_07, and it stopped working, I uninstalled both 1.3.1_07 and 1.4.2 and reinstalled 1.3.1_07, and since then I get a dialog with the message:
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The Bridge was installed at <C:\PROGRA~1\JavaSoft\JRE\1.37DB1~1.1_0> but the class is not there
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And the dialog title says "Java(TM) Plug-in 1.4 Fatal Error"
BUT 1.4 is uninstalled and totally GONE!
I have uninstalled and reinstalled numerous times, numerous versions of JDK/JRE, always with the same basic result. Any attempts to install 1.4.x (either JRE or JDK) give this dialog PLUS a series of little dialogs with the header "asdas", and the message "register failk". I've looked through the forums and buglists for this same problem and found a few mentions of it, but there never seems to be any solution given.
And by the way, Mozilla 1.4 works perfectly with all the plug-in versions I've installed.
I'm beginning to believe there's a conspiracy....

I found my own solution to this one after many more hours of frustration. I found that there was a toolbar applet installed in Internet Explorer that started its own private JVM, and that JVM was being seen by the plugin code for 1.3.1_07. Apparently there was some conflict between what the plugin code expected and what that private JVM (not sure what version it was, the code had no mention of it) had to offer, which caused the crash dialog. Uninstalling the toolbar (and its parent application) solved the problem. I may do further testing to see if there are any plugin versions that do work with this particular applet.
It is also still a mystery why this problem only cropped up after installing and uninstalling 1.4.x version of the plugin, but I didn't keep close track of the whole sequence so it may have been coincidental.
Hope this helps someone.

[SOLVED] java plugin suddenly stopped working

hello,
Java applets used to work without any hassle, but suddenly something happened i guess, that made it show blank windows where the applets are supposed to be shown.
I'm using Firefox Shiretoko 3.5.2 and packages installed are: jdk jre
about:plugins
Java(TM) Plug-in 1.6.0_16
File name: libnpjp2.so
The next generation Java plug-in for Mozilla browsers.
MIME Type Description Suffixes Enabled
application/x-java-vm Java™ Plug-in Yes
application/x-java-applet Java™ Plug-in Applet Yes
application/x-java-applet;version=1.1 Java™ Plug-in Yes
application/x-java-applet;version=1.1.1 Java™ Plug-in Yes
application/x-java-applet;version=1.1.2 Java™ Plug-in Yes
application/x-java-applet;version=1.1.3 Java™ Plug-in Yes
application/x-java-applet;version=1.2 Java™ Plug-in Yes
application/x-java-applet;version=1.2.1 Java™ Plug-in Yes
application/x-java-applet;version=1.2.2 Java™ Plug-in Yes
application/x-java-applet;version=1.3 Java™ Plug-in Yes
application/x-java-applet;version=1.3.1 Java™ Plug-in Yes
application/x-java-applet;version=1.4 Java™ Plug-in Yes
application/x-java-applet;version=1.4.1 Java™ Plug-in Yes
application/x-java-applet;version=1.4.2 Java™ Plug-in Yes
application/x-java-applet;version=1.5 Java™ Plug-in Yes
application/x-java-applet;version=1.6 Java™ Plug-in Yes
application/x-java-applet;jpi-version=1.6.0_16 Java™ Plug-in Yes
application/x-java-bean Java™ Plug-in JavaBeans Yes
application/x-java-bean;version=1.1 Java™ Plug-in Yes
application/x-java-bean;version=1.1.1 Java™ Plug-in Yes
application/x-java-bean;version=1.1.2 Java™ Plug-in Yes
application/x-java-bean;version=1.1.3 Java™ Plug-in Yes
application/x-java-bean;version=1.2 Java™ Plug-in Yes
application/x-java-bean;version=1.2.1 Java™ Plug-in Yes
application/x-java-bean;version=1.2.2 Java™ Plug-in Yes
application/x-java-bean;version=1.3 Java™ Plug-in Yes
application/x-java-bean;version=1.3.1 Java™ Plug-in Yes
application/x-java-bean;version=1.4 Java™ Plug-in Yes
application/x-java-bean;version=1.4.1 Java™ Plug-in Yes
application/x-java-bean;version=1.4.2 Java™ Plug-in Yes
application/x-java-bean;version=1.5 Java™ Plug-in Yes
application/x-java-bean;version=1.6 Java™ Plug-in Yes
application/x-java-bean;jpi-version=1.6.0_16 Java™ Plug-in Yes
I tried removing+reinstalling both of them, also removing .mozilla folder.
Also tried linking the .so plugin file to .mozilla folder. but no luck ;(
any other ideas?
thank you!
Last edited by 00l0 (2009-08-25 14:22:56)

thank you both!
@thisoldman:
I tried your advices but no luck ;( Preferences are correctly set
Ranguvar wrote:OP, do normal Java apps still work?
Now i have realized that's not so. I tested some JAR little applications and weird errors appear, this is the output:
# A fatal error has been detected by the Java Runtime Environment:
# SIGSEGV (0xb) at pc=0x00007f9596e22578, pid=3092, tid=140280444864784
# JRE version: 6.0_16-b01
# Java VM: Java HotSpot(TM) 64-Bit Server VM (14.2-b01 mixed mode linux-amd64 )
# Problematic frame:
# C [libc.so.6+0x30578] catgets+0x18
# An error report file with more information is saved as:
# /media/data/descarregues/programming/jogl/nehejoglports/hs_err_pid3092.log
# If you would like to submit a bug report, please visit:
# http://java.sun.com/webapps/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
Aborted
and the log file,
cat hs_err_pid3092.log :
http://pastebin.com/m204f2b77
looks serious :S
thanks!

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Hello!
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Hello agin...
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I have re-installed java several times and can not get the plug in to work. So frustrating.

Hi mommaduckof2,
Have you tried downloading this Java update? Hopefully it will help ....
Java for OS X 2013-003
The article below explains what this update does:
About Java for OS X 2013-003
This release updates the Apple-provided system Java SE 6 to version 1.6.0_45 and is for OS X versions 10.7 or later.
This update uninstalls the Apple-provided Java applet plug-in from all web browsers. To use applets on a web page, click on the region labeled "Missing plug-in" to go download the latest version of the Java applet plug-in from Oracle.
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Judy

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HT1338 java plug-in doesnt work

Hi,
my java plug-in doesnt seem to work. i have done several software updates. please help me

REF: macrumors.com
quote
inkswamp
4 weeks ago
Well, I don't think I will join the debate about Java, but a temporary fix to enable Java (I know, it is a security hazard, however I don't have another option as I have to use the Juniper SSL VPN network connect client).
So,
1. close Safari
2. Open a terminal
3. sudo vi /System/Library/CoreServices/CoreTypes.bundle/Contents/Resources/XProtect.meta. plist
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best of luck....
end of quote:
NOTe: I didn't write this but have the same problem, haven't tried it either, as I use a javascript to download videos from you tube that doesn't work. Apparently, Apple disabled the plug-in because some sheetbirds are using the vulnerability to break into Apple Users computers. My suggention it to wait and let Apple deal with, if you need capability, the above seems to work based on the responses from macrumors. Like I said earlier I haven't tried it so use at your own risk. It ooks like a simple change, just a flag, change it, do your business, then reset the flag back to 19 or better yet, save the plist file to .plist.old and rename it when you are done.
Hope this helps

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Thanks & Bye,
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try {
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at org.eclipse.swt.SWT.error(SWT.java:4109)
at org.eclipse.swt.SWT.error(SWT.java:3998)
at org.eclipse.swt.awt.SWT_AWT.new_Frame(SWT_AWT.java:145)
at com.lspeed.workbench.AstoriaNavigatorWindowAdvisor.prepareModalFrame(AstoriaNavigatorWindowAdvisor.java:416)
at com.lspeed.workbench.AstoriaNavigatorWindowAdvisor.createWindowContents(AstoriaNavigatorWindowAdvisor.java:325)
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at org.eclipse.jface.window.Window.create(Window.java:431)
at org.eclipse.ui.internal.Workbench$22.runWithException(Workbench.java:1208)
at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3593)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3286)
at org.eclipse.ui.application.WorkbenchAdvisor.openWindows(WorkbenchAdvisor.java:803)
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at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:150)
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at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
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at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
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at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at org.eclipse.swt.awt.SWT_AWT.new_Frame(SWT_AWT.java:140)
... 25 more
due to the following cause:
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I think I'm stuck there.

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The recently released Java 7 Update 11 has been blocked by Apple through its XProtect anti-malware feature in OS X.
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Apple took action on its own and quietly disabled the plugin through its OS X anti-malware system. And as noted by MacGeneration on Thursday, Apple has again updated its OS X XProtect list, this time to block Java 7 Update 11.
Because Oracle has yet to issue a newer version of Java that addresses any outstanding issues, Mac users are prevented from running Java on their system.
Over the last few years, Apple has moved to gradually remove Java from OS X. The Mac maker dropped the Java runtime from the default installation for OS X 10.7 Lion when the operating system update launched in 2010. Java vulnerabilities have been a common exploit used by malicious hackers looking to exploit the OS X platform.
Most notably, the "Flashback" trojan that spread last year was said to have infected as many as 600,000 Macs worldwide at its peak. Apple addressed the issue by releasing a removal tool specifically tailored for the malware, and also disabled the Java runtime in its Safari web browser starting with version 5.1.7.
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