Frequently Asked Questions Frequenty Asked Questions


Here you will find commonly asked questions of the ResCarta support team...


 We have suggested using Oracle (previously Sun Microsystems) JAVA for many years, but recent events has changed our thinking.

Oracle will no longer provide free continuing support (updates) for OpenJDK LTS versions at

AdoptOpenJDK does provide support at

AdoptOpenJDK is now distributing OpenJDK msi installers. The installers will optionally updated the PATH and JAVA_HOME. We recommend removing Oralcle JAVA with the operating system supported method and installing OpenJDK 11 LTS.  Version 7.0.2 of the ResCarta Toolkit supports OpenJDK 11.

AdoptOpenJDK is also providing updates to OpenJDK 8.

The most asked question concerns the use of 32bit JAVA on a 64bit machine.  It you are using a 64bit operating system, download the 64bit JAVA from Oracle.  The current url for JAVA 8 from Oracle is.   

Take care not to update to unsupported versions of 9, or 10

For those running "ix" operating systems ...

$ sudo apt-get install openjdk-11-jdk


$ su -c "yum install java-1.8.0-openjdk"


During the installation of the ResCarta Toolkit you will see that the installer selects 32bit or 64bit options based on your installed JAVA. If you run 32bit JAVA on a 64bit machine you will get poor performance and have access to only one gigabyte of memory.

Most ResCarta problems over the years involve early untested releases of JAVA by Oracle. See the history of releases at wikipedia.  If you see a release date within a day or two of another release date, chances are you will be experiencing some malfunction.  We advise updating JAVA only if you need to do so for some known reason.





What is the purpose of the "aggregator" ?


The METADATA Creation tool will assign a sequential number as an aggregator. The aggregator name (number) is used as a secondary directory name to limit the number of objects that are stored in the directory structure.
This directory sits under the top level Institutional  directory and above the root identifier named directory which holds or contains the digital objects.  It is useful to limit the overburdening of most modern operating system from having too many items in a single directory.

Root Identifiers

Should I pick my own root identifier or let the program create one?

The METADATA Creation tool will assign a sequential number as a root identifier by default. This is to assist you in creating unique root ids. If you want to tag your digital objects with your own UNIQUE eight character identifier you can just overwrite the number presented in the dialog box. Remember however that these ids must be kept unique.