Error saving the form.

Error on UI:

Error in $Tomcat/logs/catalina.out

java.lang.NullPointerException
at edu.wustl.dynamicextensions.formdesigner.resource.Form.editForm(Form.java:175)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at

The above error might come when updating/saving the form controls.

This happens when the app context name (openspecimen) is not used in the URL.
Therefore the user needs to ensure 2 things:

ProxyPassReverseCookiePath is configured.
The App URL is correctly configured reflecting how the app is accessed.

Make sure ProxyPassReverseCookiePath is configured in Apache’s configuration file:

<VirtualHost *:80>
   ServerName <domain name>
   ProxyPreserveHost On

   ProxyPass / ajp://localhost:8009/openspecimen/
   ProxyPassReverse / ajp://localhost:8009/openspecimen/

   ProxyPassReverseCookiePath /openspecimen /

</VirtualHost>

Configure the application URL in OpenSpecimen settings.

Click on navigation button → Settings → Common → Application URL.

Application URL = URL using which OpenSpecimen is accessed.

Screenshots for reference

Screen 1:

Screen 2: