185854 - Not able to call functions in applets from JavaScript

Status: RESOLVED DUPLICATE of bug 115998

(Core Graveyard :: Java: OJI, defect)

Description

[Everett Stauffer]

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2) Gecko/20021202
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2) Gecko/20021202

Pages/applet/javascript works on Windows NT with Moz 1.2.1, does not
work on RedHat Linux 8.0 using Moz 1.2.1/Xft

Same problem seems to be in Moz 1.1.

Code did work on Moz 1.0.1/Java 1.4.0

Tested with jre/sdk 1.3.1, 1.4.0 and 1.4.1
(libjavaplugin_oji.so is properly symlinked and $JAVA_HOME set)

Applets not using LiveConnect work just fine.

Reproducible: Always

Steps to Reproduce:
1. Load page with javascript and applet (from same site)
2. Have javascript call function in applet (using onLoad)
3. Typical js error: mngr.getOutput is not a function
   (where mngr is the js var for the applet)

Actual Results:  
Java Console shows that applet loaded/started properly.
No effect in browser, error message shows in javascript console.
Javascript does find Applet object.

Expected Results:  
Should have executed function call in/on applet code

Comment 1

[Phil Schwartau]

---> OJI

Everett: is there a URL we can use to see the problem? Thanks -

Comment 2

[Everett Stauffer]

Test URL:
http://chem-admin.ucsd.edu/~everett/bugzilla/

Comment 3

[Phil Schwartau]

Everett: nice testcase! Confirming bug.

I cannot reproduce the bug on WinNT using Mozilla trunk 20021204xx
and Java Plug-in 1.4.1. However, I can reproduce it on Linux with 
a trunk build from the same date and Java Plug-in 1.4.0-b92.
When I first load the test on Linux, I get these messages:

In the JavaScript Console:

Error: tapplet.testApplet is not a function
Source File: http://chem-admin.ucsd.edu/~everett/bugzilla/bugtest.js
Line: 6

In the Java Console:

started
(and no further message)


If I now click on the test link, I get a second error in the JS Console:

Error: tapplet.testit is not a function
Source File: http://chem-admin.ucsd.edu/~everett/bugzilla/bugtest.js
Line: 10



This seems to be a timing issue. Because if I hit "Reload", everything
works without error. I get TWO messages in the Java Console this time:

started
testApplet called

And now when I click the link, I get no errors and the test works!
To be precise: I see a third message in the Java Console:

testit called

And in the browser, the applet prints:

"The applet returned this string"

Comment 4

[Everett Stauffer]

Note: Bug report is for linux version.  WinNT works (as I stated).

I do not have any success with reloading the page.  I did at first
suspect a timing issue with onLoad (thought maybe the applet wasn't
found.)  But a quick test with an alert() showed that the onLoad
handler _always_ finds the applet object, just can't call any functions.

Phil- Your behavior report is identical to my experience (excepting getting
      it to work using a reload.)  My 'real' applications are much larger,
      perhaps this would exacerbate the "timing" problem?

Comment 5

[Phil Schwartau]

I know that at one time, Mozilla Linux OJI plug-ins communicated with
an out-of-process JVM; Windows and Mac OJI plug-ins entirely in-process. 

I don't know if that is still true, or if it bears on this problem.
I will have to let the OJI experts comment -

Comment 6

[Joshua Xia]

using onLoad to call method in Applet from javascript leads to so problem
because Applet is onload, fix when redesign?

Comment 7

[Pete Zha]

dup of bug 115998

*** This bug has been marked as a duplicate of 115998 ***