[midPoint] NULL prismContext

[Pavol Mederly]

Hello Jan,

this kind of exceptions (i.e. NPE related to prism context being null) 
has been beating me for years.

Generally, is issue occurs when Wicket serializes and then deserializes 
content of a page and then invokes a method to do something.

A quite universal way of preventing it is to call adopt() method on any 
objects that could have come from such deserialization.

An example: 
https://github.com/Evolveum/midpoint/blob/8eac39e2553501a59221ba7a13afc4b13a7dff88/gui/admin-gui/src/main/java/com/evolveum/midpoint/web/page/admin/users/PageUser.java#L418

Here the "user" comes from delegationsModel.getObject() that can be 
possibly serialized and deserialized, because it's part of a page.

At least this is how I understand it. I try to avoid messing with GUI as 
much as I can. :-)

Best regards,

Pavol Mederly
Software developer
evolveum.com

On 11.10.2019 15:01, Jan Vaňáček - AMI Praha a.s. wrote:
>
> Hi guys,
>
> I am using midPoint 3.7 support and l am looking into NPE connected 
> with prismContext and I am a little bit getting frustrated since I 
> have no idea how to find root cause.
>
> This NPE occurs when computing authorizations for Org tree.
>
> I have an authorization (for deleting subunits):
>
> <authorization>
>
> <name>_org_-delete-subunit</name>
>
> <action>http://midpoint.evolveum.com/xml/ns/public/security/authorization-model-3#delete</action>
>
> <object>
>
> <type>OrgType</type>
>
> <orgRelation>
>
> <subjectRelation>org:manager</subjectRelation>
>
> <scope>allDescendants</scope>
>
> <includeReferenceOrg>true</includeReferenceOrg>
>
> </orgRelation>
>
> <filter>
>
> <q:equal>
>
> <q:path>orgType</q:path>
>
> <q:value>ROLE_FOLDER</q:value>
>
> </q:equal>
>
> </filter>
>
> </object>
>
> </authorization>
>
> When I click into Org. structure and then I click on any item in a 
> tree (including root org) authorizations will be computed.
>
> But when it gets to computing root org object. It invokes 
> object.getPrismContext() which is null resulting in Error 500: 
> /org.apache.wicket.WicketRuntimeException: Error attaching this 
> container for rendering: [ListView [Component id = menuItem]]/
>
> When I try to click (compute) it for the second time it is OK. But 
> then it occures sometimes again (especially when I log out and log in, 
> but it depends – sometimes it is just on the 10th attempt, sometimes 
> on the 2nd attempt)
>
> I noticed that in com.evolveum.midpoint.prism.Item is mentioned: 
> „beware, this one can easily be null“, but in QueryJaxbConvertor it is 
> not checked for null…
>
> Is there any way how to make sure that there always be prismContext 
> for a root org? Or what else should I check?
>
> *Jan Vaňáček*
> JAVA programátor
>
> gsm: [+420] 734 510 214
> e-mail: jan.vanacek at ami.cz <mailto:jan.vanacek at ami.cz>
>
> *AMI Praha a.s.*
> Pláničkova 11, 162 00 Praha 6
>
> tel.: [+420] 274 783 239 | web: www.ami.cz <http://www.ami.cz/>
>
> AMI Praha a.s.
>
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