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I recently treid to compile the DBPedia Extraction Framework. What was not immediately clear to me is whether I have to have Scala installed. It turns out that having Scala installed natively is not necessary, seeing as the
scala-maven-plugin is sufficient.
The steps to compile DBPedia Extraction Framework from the command line are:
- Ensure you have the JDK 1.8.x installed.
- Ensure Maven 3.x is installed.
- mvn package
Steps to compile DBPedia Extraction Framework from the Scala IDE (which can be downloaded from Scala-ide.org) are:
- Ensure you have the JDK 1.8.x installed.
- Ensure you have the Scala IDE installed.
- Import existing Maven project into Scala IDE.
mvn clean installfrom within the IDE.
A recent Gartner report has mentioned that Oracle ADF has been plagued by frequent crashes, but that these have been addressed in Oracle Fusion Middleware 12c . I find it alarming that these stability issues have only been addressed recently. This is alarming taking into consideration that Oracle ADF has been in development close to 10 years (The core of Oracle ADF is based on JSR 227 which the Java Community Process voted on already in 2003) . In this post I will share my reasoning as to why I am still not overly optimistic about Oracle ADF.
Oracle ADF is an implementation of JSR 227. JSR 227 is an attempt at providing standard binding between any frontend and any type of service. Data controls can be created for instance for JDBC, EJB and Web Services . JSR 227 ignores the difference between transactional vs. non-transactional resources and data sources vs. services. In comments on JSR 227 these differences has been highlighted with SAP warning that JSR 227 could violate the integrity of JEE .
The Java Community is betting against Oracle ADF
According to Shay Shmeltzer (group manager for Oracle JDeveloper ) Oracle has withdrawn JSR 227 “since the other members of the Java community process didn’t show interested in pursuing this approach further.”  With the initial vote for the JSR, IBM and BEA have raised concerns around the complexity of JSR 227 and stated that they consider the scope to be too broad . In recent writing Paul Dorsey (from BEA), describes Oracle ADF as highly complex and as a high risk endeavor  .
Lack of Skills
Edwin Biemond, an Oracle ACE and Java Developer of the year 2009 by Oracle Magazine , states that there is a general lack of skills in Oracle ADF. His sentiment is supported by other developers on the forum .
The learning curve for Oracle ADF is very steep. Becoming productive (not expert!) in Oracle ADF takes 3-6 months assuming the person is a skilled Java Web developer  . The implications for this are:
- Any Oracle ADF project shorter than 6 months will be disproportionately expensive due to the ramp-up time required by the team.
- Any Oracle ADF project shorter than 6 months carries an even higher risk due to the team not being allowed the time to gain the needed knowledge on Oracle ADF.
- An Oracle ADF project has to be staffed with senior web developers.
Lack of in-depth documentation
The declarative nature of Oracle ADF causes Oracle ADF developer guides to describe “the how” and not “the why”. According to Frank Nimphius (Principle Product Manager for Application Development Tools at Oracle Corporation ) Oracle does not plan on providing in-depth documentation but rather they plan on compiling a list of topics which will then be sourced out to the community . Since knowledge regarding the intricacies of Oracle ADF resides within Oracle, this is an approach that is doomed to failure. Indeed, the success of Open Source tools like Spring, Hibernate and JBoss is intimately linked to the availability of in-depth documentation supplied by their designers. In absence of in-depth documentation, Oracle ADF developers are forced to trawl through the source code of Oracle ADF . Source code is a rather poor substitute for proper documentation since in the absence of a design context; the intent of the source code is obfuscated.
Substantial increase in availability of Oracle ADF skills and resources is highly unlikely
Progress on JSR 227 has been rather slow. The initial JCP vote on JSR 227 has taken place 7 July 2003 with a first draft only being available by 11 December 2008. No further progress has been made on this JSR and it has been withdrawn . If one compares progress of JSR 227 to for instance the JSF JSR, the initial vote took place on 29 May 2001 with a Final Release available by 11 March 2004 .
This means that Oracle ADF has been in the making for at least 9 years. If it has been impossible in the last 9 years to provide in-depth Oracle ADF documentation and to grow the skills base around Oracle ADF, it is rather unlikely that it will miraculously change in the near future (2 years).
The risk of an Oracle ADF project is disproportionately high due to its complexity, the lack of in-depth documentation and the absence of skills. This is unlikely to change in the near future.
 M. Driver, “Oracle Application Development Framework: Past, Present and Future,” Gartner, 2012.
 “JSR 227 Status,” 8 May 2011. [Online]. Available: http://groups.google.com/group/adf-methodology/browse_thread/thread/ca3e8c6776e3e2ef. [Accessed 4 August 2011].
 Java Community Process, “JSR-000227 A Standard Data Binding & Data Access Facility for J2EETM Platform,” Java Community Process, 2008. [Online]. Available: http://jcp.org/aboutJava/communityprocess/edr/jsr227/index.html. [Accessed 2 Sept 2012].
 S. Shmeltzer, “Shay Shmeltzer,” [Online]. Available: http://shayshmeltzer.sys-con.com/. [Accessed 1Sept 2012].
 J. 2. Status, Google Groups: ADF Enterprise Methodology Group, [Online]. Available: https://groups.google.com/forum/?fromgroups=#!topic/adf-methodology/yj6MZ3bj4u8. [Accessed 1 Sept 2012].
 P. Dorsey, “How Will You Build Your Next System?,” DULCIAN, Inc, 2012. [Online]. Available: http://www.dulcian.com/papers/IOUG/2012/2012_IOUG_Dorsey_BuildNextSystem.pdf. [Accessed 2 Sept 2012].
 E. Biemond, “About Me,” [Online]. Available: http://biemond.blogspot.com/p/about-me.html. [Accessed 2 Sept 2012].
 E. Biemond, “Less xml in ADF and move forward to Java EE 6 in 12c,” Google Groups: ADF Enterprise Methodology Group, 2 Jan 2012. [Online]. Available: https://groups.google.com/forum/?fromgroups=#!topic/adf-methodology/_fDyNUsXUmo. [Accessed 2 Sept 2012].
 S. Davelaar, “How to become an Oracle ADF expert in one week (or in 1 day if you don’t have so much time),” JHeadstart Blog, 13 Sept 2011. [Online]. Available: https://blogs.oracle.com/jheadstart/entry/how_to_become_an_oracle. [Accessed 2 Sept 2012].
 F. Nimphius, “Frank Nimphius,” Sys-Con Media, [Online]. Available: http://franknimphius.sys-con.com/. [Accessed 2 Sept 2012].
 “ADF’s Learning Curve,” Google Groups: ADF Enterprise Methodology Group, 30 Jan 2009. [Online].Available: https://groups.google.com/forum/#!msg/adf-methodology/KPt0Hf2yudo/TrEW70qkAT4J. [Accessed 2 Sept 2012].
 D. Mills, “The GroundBlog by Duncan Mills: Facelets and PanelDashboard Gotchya,” Oracle, 20 Jul 2012. [Online]. Available: https://blogs.oracle.com/groundside/entry/facelets_and_paneldashboard_gotchya. [Accessed 2
 Java Community Process, “JSR 127: JavaServer Faces,” Java Community Process, 2004. [Online]. Available: http://www.jcp.org/en/jsr/detail?id=127. [Accessed 2 Sept 2012].
 J. Kotamraju, Web Services for Java EE, version 1.3, Sun Microsystems, 2009.
 Oracle Corporation, “Oracle ACE Program – FAQ,” Oracle Corporation, 16 Jun 2011. [Online]. Available: http://www.oracle.com/technetwork/community/oracle-ace-faq-100746.html. [Accessed 2 Sept 2012].