Exception: org/postgresql/Driver : Unsupported major.minor version 52.0

change jdk version use openjdk-8

using

#update-alternatives –config java

Dspace6 -“CREATE EXTENSION pgcrypto” Error

to install POSGRESQL pgcrypto EXTENSION

you must install  postgresql-contrib

# apt-get install postgresql-contrib

Add new Discovery search filter & facet fields in dspace

1- add the field to indeing

edit the files dspace.cfg

The search commands are written as “search.index.# = [name]:[schema].[element].[qualifier]”

add the field in this section

changing these will change your search results

search.index.6 = abstract:dc.description.abstract

 

2- add the field text in

  i18n/messages.xml

like

    <message key=”xmlui.ArtifactBrowser.AdvancedSearch.type_abstract”>abstract</message>

    <message key=”xmlui.ArtifactBrowser.SimpleSearch.filter.abstract”>abstract</message>

3- Creating a new discovery bean

open the file

[Dspace]/config/spring/api/discovery.xml

add the new fitler field to this section

<list>

    <refbean="searchFilterTitle"/>

    <refbean="searchFilterAuthor"/>

    <refbean="searchFilterSubject"/>

    <refbean="searchFilterAbstract"/>

</list>

for facet add it in this section

<property name=”sidebarFacets”>
<list>
<ref bean=”searchFilterAuthor” />
<ref bean=”searchFilterSubject” />
<ref bean=”searchFilterPublisher” />
<ref bean=”searchFilterIssued” />
<ref bean=”searchFilterAbstract” />

</list>

4- then create the field configuration beans

<!–Search filter configuration beans–>
<bean id=”searchFilterAbstract” class=”org.dspace.discovery.configuration.DiscoverySearchFilterFacet”>
<property name=”indexFieldName” value=”abstract”/>
<property name=”metadataFields”>
<list>
<value>dc.description.abstract</value>
</list>
</property>
</bean>

5- reindex discovery and restart tomcat

./dspace index-discovery -f

service tomcat7 restart

Tomcat memory heap error

change CATALINA_OPTS=”-Xms(min heap)m -Xmx(max heap)m”
in /usr/share/tomcat7/bin/catalina.sh

and create swap driver

///===== clear tomcat cash
rm -rf /var/lib/tomcat7/work/Catalina/localhost/*

constraint error when importing records

need to alter the CONSTRAINT then run the import command

ALTER TABLE collection2item DROP CONSTRAINT collection2item_item_id_fkey;

ALTER TABLE community2community DROP CONSTRAINT community2community_child_comm_id_fkey;

ALTER TABLE community2collection DROP CONSTRAINT community2collection_collection_id_fkey;

how total item on a community/collection

Apache Solr Essentials Book, Reviewed by me

Leverage the power of Apache Solr to create efficient search applications

https://www.packtpub.com/big-data-and-business-intelligence/apache-solr-essentials

About the reviewer

https://www.safaribooksonline.com/library/view/apache-solr-essentials/9781784399641/pr05.html