Research Entities

[Aboubakr Aly Badr]

Hello,

I am getting this error when trying to apply the Research Entities model to my test instance. Using this command:

dspace dsrun org.dspace.app.util.InitializeEntities -f relationship-types.xml

Exception: null
java.lang.NullPointerException
    at org.dspace.app.util.InitializeEntities.parseXMLToRelations(InitializeEntities.java:131)
    at org.dspace.app.util.InitializeEntities.run(InitializeEntities.java:106)
    at org.dspace.app.util.InitializeEntities.main(InitializeEntities.java:77)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.dspace.app.launcher.ScriptLauncher.runOneCommand(ScriptLauncher.java:277)
    at org.dspace.app.launcher.ScriptLauncher.handleScript(ScriptLauncher.java:133)
    at org.dspace.app.launcher.ScriptLauncher.main(ScriptLauncher.java:98)

The relationship-types.xml is attached.

Any help?

Thanks a lot

Aboubakr Aly Badr

[Mark H. Wood]

On Mon, Jul 05, 2021 at 02:24:41AM -0700, Aboubakr Aly Badr wrote:
> I am getting this error when trying to apply the Research Entities model to
> my test instance. Using this command:
> dspace dsrun org.dspace.app.util.InitializeEntities -f
> relationship-types.xml
>
> Exception: null
> java.lang.NullPointerException
> at
> org.dspace.app.util.InitializeEntities.parseXMLToRelations(InitializeEntities.java:131)

That line assumes the existence of at least one 'leftwardType' element
as a child of each 'type' element and tries to extract the text
content of the first one found.

https://github.com/DSpace/DSpace/blob/87bb9e44f07d11126eaa5dc194cdd885fa2f0058/dspace-api/src/main/java/org/dspace/app/util/InitializeEntities.java#L131

Your 'relationship-types.xml' contains 'type' elements having no
'leftwardType' elements. The code does not guard against missing
elements, so it throws a NullPointerException.

I'm not yet familiar enough with the entities configuration to say
whether your file or the code is incorrect. The code *is* fragile and
*does* throw an uninformative exception.

> The relationship-types.xml is attached.
> Any help?
> Thanks a lot
> Aboubakr Aly Badr
>

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> <?xml version="1.0" encoding="UTF-8"?>
> <relationships>
> <type>
> <leftType>Publication</leftType>
> <rightType>Person</rightType>
> <leftLabel>isAuthorOfPublication</leftLabel>
> <rightLabel>isPublicationOfAuthor</rightLabel>
> <leftCardinality>
> <min>0</min>
> <!--<max></max> not specified, unlimited-->
> </leftCardinality>
> <rightCardinality>
> <min>0</min>
> <!--<max></max> not specified, unlimited-->
> </rightCardinality>
> </type>
> <type>
> <leftType>Publication</leftType>
> <rightType>Project</rightType>
> <leftLabel>isProjectOfPublication</leftLabel>
> <rightLabel>isPublicationOfProject</rightLabel>
> <leftCardinality>
> <min>0</min>
> </leftCardinality>
> <rightCardinality>
> <min>0</min>
> </rightCardinality>
> </type>
> <type>
> <leftType>Publication</leftType>
> <rightType>OrgUnit</rightType>
> <leftLabel>isOrgUnitOfPublication</leftLabel>
> <rightLabel>isPublicationOfOrgUnit</rightLabel>
> <leftCardinality>
> <min>0</min>
> </leftCardinality>
> <rightCardinality>
> <min>0</min>
> </rightCardinality>
> </type>
> <type>
> <leftType>Person</leftType>
> <rightType>Project</rightType>
> <leftLabel>isProjectOfPerson</leftLabel>
> <rightLabel>isPersonOfProject</rightLabel>
> <leftCardinality>
> <min>0</min>
> </leftCardinality>
> <rightCardinality>
> <min>0</min>
> </rightCardinality>
> </type>
> <type>
> <leftType>Person</leftType>
> <rightType>OrgUnit</rightType>
> <leftLabel>isOrgUnitOfPerson</leftLabel>
> <rightLabel>isPersonOfOrgUnit</rightLabel>
> <leftCardinality>
> <min>0</min>
> </leftCardinality>
> <rightCardinality>
> <min>0</min>
> </rightCardinality>
> </type>
> <type>
> <leftType>Project</leftType>
> <rightType>OrgUnit</rightType>
> <leftLabel>isOrgUnitOfProject</leftLabel>
> <rightLabel>isProjectOfOrgUnit</rightLabel>
> <leftCardinality>
> <min>0</min>
> </leftCardinality>
> <rightCardinality>
> <min>0</min>
> </rightCardinality>
> </type>
> </relationships>

--
Mark H. Wood
Lead Technology Analyst

University Library
Indiana University - Purdue University Indianapolis
755 W. Michigan Street
Indianapolis, IN 46202
317-274-0749
www.ulib.iupui.edu

[Aboubakr Aly Badr]

Thanks Mark for your answer.

Indeed my xml file contained an old label "rightLabel", once change it to "rightwardType" the command executed with no errors.

Will need to figure out the rest of steps to enable the model on the frontend.

Best regards

Aly