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Joseph Sweet
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Joined: Jan 29, 2005
Posts: 327
Why do tutorial writers feel such a desperate need to write convoluted, obscure descriptions, when using a simple language would do much better work, and would leave their readers with much more knowledge, and with much less headaches and frustration???

Example 1:

From Sun's EJB security tutorial:



Java EE security is easy to implement and configure, and can offer fine-grained access control to application functions and data. However, as is inherent to security applied at the application layer, security properties are not transferable to applications running in other environments and only protect data while it is residing in the application environment. In the context of a traditional application, this is not necessarily a problem, but when applied to a web services application, where data often travels across several intermediaries, you would need to use the Java EE security mechanisms along with transport-layer security and message-layer security for a complete security solution.



After reading it over and over for 5 times, I actually figured out that they are trying to say something like:

EJB security can only protect the objects and data that reside in the EJB container. When objects and data are sent to other environments, such as web services, they cannot be protected by the EJB container while they are traveling outside of the EJB container.

Example 2:

From "Mastering EJB" 3rd edition:



TRANSACTIONS AND J2EE CONNECTORS

The J2EE Connector Architecture defines a standard contract between Resource
Adapters (RA) and application servers such that RA can leverage the container
services for supporting transactions. This standard contract enables an
application server to provide the infrastructure and runtime environment for
transaction management of RA components. RA can support either a local
transaction, which is managed internally by the resource manager, or it can
support a distributed transaction, whose coordination does involve external
transaction managers. If RA that supports local transactions, the client
component, such as an EJB, will have to acquire the common client interface
API object, such as javax.resource.cci.LocalTransaction or an equivalent from
the resource adapter to demarcate the transactions. If RA supports distributed
transactions, the container will automatically enlist the client in the transaction
context, if the client wants to work within a distributed transaction.
J2EE Connector Architecture 1.5 supports the inflow of transactions from
Enterprise Information System (EIS) to the J2EE environment. This is a powerful
addition because it enables the J2EE applications to participate in transactions
initiated by backend EIS. For example, you can make your stateless session
bean participate in a transaction that was initiated in the Tuxedo environment,
given that the underlying RA supports this contract. Chapter 17 explains J2EE
Connector Architecture in more details.



We are in chapter 12. Why do you use terms that you are not going to explain till chapter 17???
This book includes some of the most obscure texts I have read in a long time. Why do they think that by calling Resource adapters "RA" I am supposed to understand what they are talking about???
[ April 14, 2007: Message edited by: Joseph Sweet ]

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Joseph Sweet
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Posts: 327
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