can't manage eeglab extensions

[dmedine]

Description

Windows 10 fully updated as of June 2019, Matlab 8.6 (R2015b)
Error message:

EEGLAB error in function pop_menu() at line 39:

Struct contents reference from a non-struct array

[Description of the bug or feature
Attach a link to Dropbox or Google Drive with screenshots and your data if possible.]
https://drive.google.com/open?id=1JJNMErJe02evRCxdsUgBIyEdNU56ygyT

Steps to Reproduce

1. [First Step]
   Download latest version of EEGLAB (2019_0)
2. [Second Step]
   Open Matlab

CD to folder with extracted EEGLAB
4.
type eeglab
5.
click on File>Manage EEGLAB extensions

#### Expected behavior: [*What you expected to happen*]
#### Actual behavior: [*What actually happened*]
#### Versions

OS version	[fill in]
Matlab version	[fill in]
EEGLAB version	[fill in]

[nucleuscub]

Hi @dmedine!
Yep, we are aware of this issue. It is not an EEGLAB issue though. It must be fixed with the update of the JAVA version used by MATLAB. See this bug report here for more details.
Hope this helps,
R

[CitizenOneX]

Just a few more details here about the issue, since I just worked it out and the comments are closed on issue #20. Some folks might need more specific details about which JAVA versions can be used, since perhaps lots of EEGLAB users could be using versions of Matlab older than R2017b, which would all seem to have this issue - @nucleuscub ?

1. https://sccn.ucsd.edu/wiki/Plugin_list_all is an https URL, and the root certificate used by SCCN is provided by Let's Encrypt, whose root certificates are only a few years old so they aren't present in root certificate stores of old programs (e.g. older versions of JAVA.)

2. According to https://letsencrypt.org/docs/certificate-compatibility/ JAVA versions after 7u111 and 8u101 should have the certificate, and hence will allow connections to Let's Encrypt-certified https websites without complaining.

3. Old MATLAB versions ship with old versions of JAVA. You can tell which version in Matlab by typing "version -java" in the Matlab command window.

4. As you might expect from the explanation above, you can fix the issue either by:
   (a) adding the Let's Encrypt certificates to your existing JAVA keystore (e.g. https://stackoverflow.com/questions/34110426/does-java-support-lets-encrypt-certificates)
   (b) pointing your Matlab to use a newer version of JAVA than the one that comes bundled with it (set MATLAB_HOME environment variable and restart, e.g. https://www.mathworks.com/matlabcentral/answers/130359-how-do-i-change-the-java-virtual-machine-jvm-that-matlab-is-using-on-windows )
   (c) use a newer version of Matlab that uses a new enough version of JAVA to have the Let's Encrypt certificates (R2017b+)
   (d) changing the SCCN certificates to an older provider whose certificates are present in the trusted stores even in older versions of JAVA (not an option for end-users!)

I had a few JAVA JREs installed already on my machine and pointing my R2017a at a JRE 1.8_211 did the trick for me.

Cheers