FAQ

No multiple derivation in myWMS.

A: To be open for everything seams not to be leakproof. myWMS comes with a standard presentation of several BusinessObjects. This is what the system needs to rely on. Additional aspects can be added by derivation of the BusinessObjects. Without any negative effect, the role concept can bee applied without the need for multiple derivation.

Nevertheless, since kernel3 access to a special derivation of a BusinessObject base type is granted, by some additional methods of the kernel interfaces. Using special derived BusinessObjects implies to follow the basic principles the basic myWMS BusinessObject types stand for.

Also some generic BusinessObject types have been added, which utilize the use of the new feature.

In the application server version of myWMS (myWMS AS) the BusinessObjects are more than ever application specific. Each fassade - generated to support a special process of the application - will use its special properties of the BusinessObjects.
This implies, that multiple derivation in myWMS AS is possible, but must be managed by the application specific code. It seems, that universal algorithms are a bit harder to implement for such an individual implementation. (Nothing is said about the time and the complexity to do such tasks - probably it will be much easier to work out myWMS AS than the kernel based myWMS.)

The kernel terminates/exits right after it has been instantiated. Why?

We even did watch differences in several java implementations on different plattforms. So for example the class BusinessObject compiled under Windows seemed to be serialized in another way than the Linux compiled class did.

A: Possibly the configuration file is trashed. Please supply a valid configuration file to the kernel.

The kernel log shows a StringIndexOutOfBoundsException right after startup. Why?

This is a log resulting from the error described above:

<jordan@max>:2003/10/29 16:01:06.573 [OPERATION|de.mywms.wms.kernel.equipment.EquipmentKernel@main] [startupProcedure()]:
Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: -2
        at java.lang.String.substring(String.java:1480)
        at de.mywms.config.ConfigurationProvider.setConfiguration(ConfigurationProvider.java:190)
        at de.mywms.config.ConfigurationFile.readConfiguration(ConfigurationFile.java:118)
        at de.mywms.config.Persistor.<init>(Persistor.java:144)
        at de.mywms.wms.kernel.equipment.EquipmentKernel.startupProcedure(EquipmentKernel.java:2523)
        at de.mywms.wms.kernel.equipment.EquipmentKernel.main(EquipmentKernel.java:2629)
Taste drücken, um fortzusetzen . . .

How do I toggle a file, checked in as a text file, to a binary file inside the CVS repository?

Please use the following command:
cvs admin -kb <filename>

This makes CVS handle the file as a binary file in future. But please keep in mind, that merging of binary files is not supported by cvs. Changes to this files will mostly result in 100% changes. If more than one person edits such a file at a time, this will always lead into a conflict.

How to prevent an "adress allready in use" error?

A good chance to prevent such conlflicts is to register the required ports in the services file of the operating system. For unixes this file is usually located at /etc/services. In Windows 2000 the file C:\WINNT\system32\drivers\etc (where c:\winnt is representing your Windows home directory). I would suggest to add the following ports to the services files:

rmi-admin        1098/tcp
rmi              1099/tcp

If you have other dedicated ports you want to save from beeing wildly used, add them also to the services file.

BTW: This hack also helps for example JBoss, wich also utilizes RMI.

How to handle Runtime Exceptions?

• Please always think about runtime exceptions!
• If an OptimsticLockException occurs: Is there a design fault? How can it be, that to people (or robots) change the same data at the same time?
• Have a look onto long running transactions in a highly responsive system. In most cases this is as impossible as dehydrated water.

Howto prevent the SQL type varchar and use type text instead?

@Type(type="text")
String getProperty() { ... }

What are your general policy when using MyWMS for commercial purpose: one time fee, per install fee, yearly fees?

I don't see any mailing list or forum or other ways to get in touch with evolutions, discussion, bugs, support. Does such informations/exchanges exists?

• wiki.mywms.org
• bugzilla.mywms.org
• www.mywms.org
• pollux.okit.de/mailman/listinfo/mywms

Is there a CVS or SVN server I can use to synch with your latest sources and analyze how I can modifiy/extent to particular customer specificities?