JAVA in Lion won't run even after install

Same thing, bigger problem

I've got the same problem, I think. Whenever I try to launch a Java-based application I get an OS X crash report which implies that java.lang.Class could not be loaded. So I tried creating an absolutely trivial "Hello World" test class and javac reports:

tamas$ javac -cp . Test.java
java.lang.ClassNotFoundException
- klass: 'java/lang/ClassNotFoundException'
Trace/BPT trap: 5

Now one thing I did that might be a bit out of the ordinary is I manually installed a 1.5 JDK as well (similar to how I had it in 10.6), so I'm wondering if there's a shared JDK cache somewhere that's corrupted. I did try rebooting and also reinstalling the Java Update for Lion, but no joy.

This sucks because if I can't resolve it by Sunday evening I'll have to revert to 10.6 until a solution is identified...

Different thing

So upon further consideration I think my problem was different from the OP's. His/her stack trace clearly shows that the Java runtime and applet plugin classes were loaded and running, whereas in my case even the most basic runtime classes were missing.

So for twwilso I suggest that the problem might be with the test page you were using rather than with the Lion Java install. I'm not sure which test page you used, but this one worked fine for me in the end.

Back to my actual problem: after a bunch of different attempts to fix things I got desperate and tried a re-install of Lion (over top of my existing Lion installation). And that worked! So I am now able to run my Java-based apps as expected.

I do still need JDK 1.5 support eventually but I am not going to repeat my install experiment until (a) I am happy that there are no further surprises in Lion and (b) I have a good backup image of my working Lion setup.

Goto Java preferences and check Enable java applet....... fixed mine I think and I did reinstall the down load from Apple first. I wonder what a good example would be to really test it. Java website said it was working fine

Live Meeting stuck on Java Loading

I have the same issue. I've been researching since upgrading to Lion last week. My corporation uses Live Meeting on BPOS-D or now Microsoft hosted Office365-Dedicated.

I can't confirm if Java 1.5 only is required or if 1.6 just didn't install correctly. I can't confirm that Java is working as Java.com doesn't really provide legitimate tests for Mac OSX. Apple Update doesn't identify any issues with Java.

I have tried running in both Safari and Firefox 5.0.1. Should I uninstall everything Java?


STOP THE PRESSES.... I FIGURED IT OUT!

I did a number of things while writing this, but I think reading through this MS page/document clued me in.

All I did was go to Java Preferences (under Utilities) and on the Advanced Tab, ensure that the last option on the list "Verify mixed security code (sandbox vs. trusted)" is set to "Enable - run with protections, no warnings". This is probably what was causing Java to hang before opening the session.

I will comment that as I write this, I've been sitting in the Live Meeting Lobby and my MBAir's fans are kicking in. I have noticed that Java can heat things up a bit. Kind of annoying, but so glad to have this functionality again.

Live Meeting Java Issue may still exist

Glad it worked for you. Glad I'm not the only one out there. I admit I didn't test an actual meeting/presentation. I just joined an ongoing meeting's lobby. I will test with an actual meeting tomorrow and see if I can share my screen.

I never even tested full functionality of presenting in OSX SL, and wasn't ever sure that would work.

Fortunately I'm not too concerned about being able to share my screen. Although I'm sure it will come up, most associates would not want to see my OSX. I have a PC at my desk that I would use for most presentations.

Can't be presenter in Live Meeting on Lion

You're right. I couldn't accept or function as a presenter. I appeared as though there was a Java plugin trying to load.

If this functionality existed before, which I don't doubt that it did, I just didn't get a chance to try it, maybe this is a compatibility issue more than just a security problem like the previous.

Let me know if you come across anything.

You guys saved my bacon -- thanks SO MUCH for posting that setting in Java Preferences. Karma smiles on you....

+1 for good Karma - thanks for posting this!

Can't be presenter in Live Meeting on Lion

Still looking for a fix for the LiveMeeting issue on Lion. I cannot be presenter. Anyone have any luck with this? Tx.

Java applet won't open after OSX Lion upgrade

Hope someone can help a non techie here. I have recently upgraded to Lion and Java applets don't load. I only use them for visiting one website, a chat room and I don't even get the coffee cup now. Where the applet appeared for choosing username and logging into chatroom used to be is now just a blank space. Very depressed! Anyone have any ideas? I have checked a few online help forums and all the Java is up-to-date and enabled, Java SE6. Thanks if anyone out there can help/advise.

I am having the same problem as mattroberts
basically I think I know what the issue is. As stated on the Java website

64 bit Java is not supported for webapps, use the 32 bit Java

I have know about this issues for two years and it still persists. Simply put any website that launches a java applet from a web page only works with 32bit java

So the question is How can I disable 64bit Java and only run 32 bit

Here is the Java Console output I get when trying to access Cisco Any Connect VPN

Thu Nov 10 12:28:06 PST 2011 ExecuteDownloader: ic=sa
Exception in thread "Thread-13" java.lang.UnsatisfiedLinkError: /private/var/folders/jt/rgjwvzf53xn13c3hcqhf_fhh0000gn/T/20111110122806307jniverify.so: no suitable image found. Did find: /private/var/folders/jt/rgjwvzf53xn13c3hcqhf_fhh0000gn/T/20111110122806307jniverify.so: mach-o, but wrong architecture
at java.lang.ClassLoader$NativeLibrary.load(Native Method)

Wirelessly posted (Mozilla/5.0 (iPod; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3)

For web apps, you have to launch Safari in 32-bit mode. You can do this by clicking on Safari, going to File, then Get Info…, and clicking the box that says "Run in 32-bit mode."

There is no 'Get Info' option to run in 32 bit mode!

Madd the Sane said:

Wirelessly posted (Mozilla/5.0 (iPod; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3)

For web apps, you have to launch Safari in 32-bit mode. You can do this by clicking on Safari, going to File, then Get Info…, and clicking the box that says "Run in 32-bit mode."

Click to expand...

You don't see this checkbox?



Remember, this is from the Finder, select the Safari application, and choose File -> Get Info (or hit Cmd-I).

jW

Sirius OSX: Thank you so much for finding that solution!

For two weeks I couldn't figure this out.

Awesome...!

Why would this have to be this hard? Could there not be a pop up of some sort in the MacOS that would give you the solution on the selection of the "Advanced" options.

This was a huge headache for me and it was not easy to find - well I never looked in the right place I guess.

This was not the first time that I Googled it and had came up with nothing.

Thanks to all !!!!

Sirius OSX said:

I have the same issue. I've been researching since upgrading to Lion last week. My corporation uses Live Meeting on BPOS-D or now Microsoft hosted Office365-Dedicated.

I can't confirm if Java 1.5 only is required or if 1.6 just didn't install correctly. I can't confirm that Java is working as Java.com doesn't really provide legitimate tests for Mac OSX. Apple Update doesn't identify any issues with Java.

I have tried running in both Safari and Firefox 5.0.1. Should I uninstall everything Java?


STOP THE PRESSES.... I FIGURED IT OUT!

I did a number of things while writing this, but I think reading through this MS page/document clued me in.

All I did was go to Java Preferences (under Utilities) and on the Advanced Tab, ensure that the last option on the list "Verify mixed security code (sandbox vs. trusted)" is set to "Enable - run with protections, no warnings". This is probably what was causing Java to hang before opening the session.

I will comment that as I write this, I've been sitting in the Live Meeting Lobby and my MBAir's fans are kicking in. I have noticed that Java can heat things up a bit. Kind of annoying, but so glad to have this functionality again.

Click to expand...

doesn't work on two machines

I have two machines, an iMac running Lion and a MBA running Snow Leopard. Both machines are up to date via Software Update and therefore both are running Java 1.6.0_29

iMac: Java(TM) SE Runtime Environment (build 1.6.0_29-b11-402-11D50b)
MBA: Java(TM) SE Runtime Environment (build 1.6.0_29-b11-402-10M3527)

I have verified (on the iMac, it's not available on Snow Leopard) in Java Preferences that applets and JWS are enabled and I played around with different settings in "Verify mixed security code" (both "run with protections, no warnings" and "Disable", just to see if that was the problem) but still no joy.

Neither of these basic test sites work for me, on either machine, neither in Safari nor in Chrome.
http://www.java.com/en/download/testjava.jsp
http://javatester.org/version.html

I did also try starting Safari in 32-bit mode as suggested above, that didn't make a bit of difference and in fact it looked like it was still running the 64 bit version of Java, based on the console output (below). I tried reordering the 32 bit and 64 bit versions in Java Preferences, that made no difference. It wouldn't let me select ONLY the 32 bit version there.


I'm at a loss for what else to try but it is very frustrating not to be able to get Java to work in any browser on either of my machines. At this point I suspect it's an issue with Java since I'm dealing with two different OS versions, different browsers, etc. However it also looks like the Oracle Java 7 development version doesn't support plugins either so that's a non-starter.
http://jdk7.java.net/macportpreview/releasenote.html

I'd appreciate any help.