Friday Oct 25, 2013

Juggling with JDKs on Apple OS X

I recently got a shiny new MacBook Pro to help me support our ADF Mobile customers. It is really a wonderful piece of hardware, although I am still adjusting to Apple's peculiar keyboard layout. Did you know, for example, that the « delete » key actually performs a « backspace »? But I disgress... As you may know, ADF Mobile development still requires JDeveloper 11gR2, which in turn runs on Java 6. On the other hand, JDeveloper 12c needs JDK 7. I wanted to install both versions, and wasn't sure how to do it.  

If you remember, I explained in a previous blog entry how to install JDeveloper 11gR2 on Apple's OS X. The trick was to use the /usr/libexec/java_home command in order to invoke the proper JDK. In this case, I could have done the same thing; the two JDKs can coexist without any problems, since they install in completely different locations. But I wanted more than just installing JDeveloper. I wanted to be able to select my JDK when using the command line as well. On Windows, this is easy, since I keep all my JDKs in a central location. I simply have to move to the appropriate folder or type the folder name in the command I want to execute. Problem is, on OS X, the paths to the JDKs are... let's say convoluted. 

Here is the one for Java 6.


The Java 7 path is not better, just different.


Intuitive, isn't it? Clearly, I needed something better...

On OS X, the default command shell is bash. It is possible to configure the shell environment by creating a file named « .profile » in a user's home folder. Thus, I created such a file and put the following inside:

export JAVA_7_HOME=$(/usr/libexec/java_home -v1.7)
export JAVA_6_HOME=$(/usr/libexec/java_home -v1.6)


alias java6='export JAVA_HOME=$JAVA_6_HOME'
alias java7='export JAVA_HOME=$JAVA_7_HOME'

 The first two lines retrieve the current paths for Java 7 and Java 6 and store them in two environment variables. The third line marks Java 7 as the default. The last two lines create command aliases. Thus, when I type java6, the value for JAVA_HOME is set to JAVA_6_HOME, for example. 

I now have an environment which works even better than the one I have on Windows, since I can change my active JDK on a whim. Here a sample, fresh from my terminal window.

fdesbien-mac:~ fdesbien$ java6
fdesbien-mac:~ fdesbien$ java -version
java version "1.6.0_65"
Java(TM) SE Runtime Environment (build 1.6.0_65-b14-462-11M4609)
Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-462, mixed mode)
fdesbien-mac:~ fdesbien$ 
fdesbien-mac:~ fdesbien$ java7
fdesbien-mac:~ fdesbien$ java -version
java version "1.7.0_45"
Java(TM) SE Runtime Environment (build 1.7.0_45-b18)
Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode)
fdesbien-mac:~ fdesbien$ 

Et voilà! Maximum flexibility without downsides, just I like it. 

Monday Oct 07, 2013

ADF at 12c: time to get the facts straight

The 12c release is a major milestone both for ADF and JDeveloper. Most of you already know how strategic ADF is to Oracle; day after day, thousands of our own developers use it to build Fusion Applications, Enterprise Manager, SOA Suite and WebCenter among others. What is not readily apparent is how much maturity there is in the framework. The roots of ADF can be traced back to 1999, when the first release of Java Business Objects (JBO) was made available. The ancestor of today's ADF Faces components, User Interface XML (UIX), has been introduced in 2002. More than ten years later, ADF is still going strong and the best is yet to come.

I have been developing with ADF since 2007. Since then, I often had the opportunity to introduce new developers to it. While I was often greeted with skepticism, the natural qualities of the framework and the productivity brought by JDeveloper usually won minds if not hearts. I saw this once again at OpenWorld 2013. Obviously, ADF is not perfect and there are several worthy alternatives in the market. But what surprises me is that many of the objections made against ADF stem from misconceptions - even after all those years. Here are five of the most common ones:

  • ADF is not open.
  • ADF is just for huge enterprise applications.
  • ADF is proprietary.
  • ADF is tied to JDeveloper,  Weblogic and Oracle Database.
  • ADF is expensive.

My aim in this post is to get the facts straight. Let's discuss each of them.

ADF is not open

This is something I heard frequently. But what does « open » mean? Is it about access to the source code? About technical interoperability? Maybe about stewardship? Customers covered by a valid support contract can request access to the ADF source code. Not only that, but some of its components have been released under open-source licenses, the most significant being Apache MyFaces Trinidad. And since ADF is built on the top of Java Enterprise Edition, it integrates with other solutions running on the platform. True, Oracle keeps full control over strategic orientations and new features. But our company is making significant efforts to better address the concerns of the community. The ADF Enterprise Methodology Group, for example, is a great forum to propose and discuss new features. We follow closely what is posted there and will never hesitate to open enhancements requests if needed.

ADF is just for huge enterprise applications

This is a funny one, and probably comes from the fact that ADF is based on Java. Yet, small and simple applications are a cinch to implement with the framework; it focuses on productivity first. Lots of people forget that ADF favors a code last approach. In other words: most ADF artifacts can be implemented declaratively rather than through code. In addition, most of the time, developers will build the user interface simply by drag and dropping attributes from the data controls palette. Moreover, ADF puts great emphasis on reuse. Entity Objects, View Objects, Task Flows and Page Fragments are inherently reusable. You can push this even further by using page fragments, JSF templates and declarative components. Thus, you can reduce the actual size of your applications by sharing code extensively between applications. It is also essential to remember that ADF implements several common software patterns, such as Model-View-Controller, for you. This results in a little more complexity, but ensures that even the smallest of your applications adhere to industry best practices. 

ADF is proprietary

ADF is certainly unique to Oracle. In fact, it represents one of our biggest competitive advantages in the marketplace. Yet, some people conveniently forget it is a superset of Java Enterprise Edition first and foremost. ADF Faces, for example, is probably the most comprehensive set of JSF components available right now; the Data Visualization components now render to HTML 5 instead of Flash. On the other hand, ADF offers extensive support for the SOAP protocol and the WS-* extensions, which are industry standards. Yes, ADF deviates from JEE in some cases - but typically this is because it was ahead of the curve. ADF BC is rooted in JBO, a technology introduced in 1999. EJBs didn't deliver the performance and features required by developers at the time. In 2008, ADF Controller and Task Flows brought more flexibility than the standard JSF controller - which finally caught up in 2013 in JEE 7. We even make it possible to use EJB or JPA to implement business logic if you prefer them to ADF BC. 

Moving forward, you can expect ADF to integrate many more standards, but not at the cost of innovation.

ADF is tied to JDeveloper,  Weblogic and Oracle Database

This one was true a few years ago. Nowadays, you can build ADF applications in Eclipse by installing the Oracle Enterprise Pack for Eclipse plugins. You can use almost any SQL92-compliant database with ADF, and we even offer optimizations specific to IBM DB2 and Microsoft SQL Server. Best of all, we offer integration to various Application Lifecycle Management platforms in JDeveloper and OEPE, but are not offering one ourselves. You get to choose the tools you prefer to support your development process. And with the free ADF Essentials, you can deploy your ADF applications to nearly all containers implementing the Java Enterprise Edition web profile. GlassFish server is an obvious choice here, but old favorites like Apache Tomcat and JBoss can be used too. 

ADF is expensive

No, it's not. For a long time, ADF has been merely inexpensive as it was bundled with WebLogic Server. With ADF Essentials, the core features are free; the features cut from from it are essentially hooks to other Fusion Middleware products. The developer tools, by the way, are completely free. You cannot really appreciate that fact unless you had to pay for multiple IDE licenses for your team, something I had to do earlier in my carrier when I was building software for IBM and Microsoft platforms. 


ADF 12c is there. And it's here to stay. Maybe you should consider it...


Frédéric Desbiens

The musings of a member of the Mobility and Development Tools Product Management team.

I focus here on my favorite development frameworks, namely Oracle ADF and the Oracle Mobile Application Framework (MAF), but also have a strong interest in SOA and web services.

The views expressed on this blog are my own and do not necessarily reflect the views of Oracle.


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