PNG file attachment, throws exception

[Migrated From Jforum.net]

(originally posted to wrong forum, sorry!)

Hi,

I attempted to upload a 181K .PNG, that does open without problem in Gimp, to the JForum.net test forum and received the following error:

exception

java.lang.NullPointerException
net.jforum.JForumExecutionContext.enableRollback(JForumExecutionContext.java:272)
net.jforum.JForum.service(JForum.java:209)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
net.jforum.util.legacy.clickstream.ClickstreamFilter.doFilter(ClickstreamFilter.java:59)

...my own install of JForum gives the same error. I don't know even httpdservlet so any help in translating the above would be a great help.

Also, from having done a little reading on these forums I am wondering whether there will be some unsupported PNG formats that JForum will not be able to handle.

Is JForum attempting to convert this .PNG to PNG?

Thank you for any info,
-ken
[originally posted on jforum.net by ken0]

[Migrated From Jforum.net]

...I've been searching for howto turn on log4j / logging outside of the general tomcat logs and I know there are posts on how to do this but as it is I don't have better error reports than what I posted above.

I have converted this particular PNG, that fails, to jpg, gif, and tiff and scaled it down to below my jforum configured minimum thumbnail settings, but I still get the same exception thrown.

However, converting a different image (.gif) to .png works fine, so this problem seems to be with this particular image...I still need to figure out why tho so I can tell my forum users why.

I realiize only the folk who wrote the classes might be able to comment, but maybe someone java or graphics lib savvy might know what's going on. I'm java ignorant at this point, but attempting to learn servlets.
-ken
[originally posted on jforum.net by ken0]

[Migrated From Jforum.net]

anuther update: it seems that regardless of image format, an uncompressed image size less than 900 KB will upload but an uncompressed image size of > 1 MB will not upload on my forum.

I've configured the attachments to allow 16MB uploads (using groups) -- and restarted tomcat -- but still no success.


[originally posted on jforum.net by ken0]

[Migrated From Jforum.net]

oh I see that I have the same problem as:

https://coderanch.com/t/575926

...and I too am using 2.1.6 so I'll check there for the answer.
[originally posted on jforum.net by ken0]