Several JDK: Can I install to jdk 1.6 and is jdk 1.7 on the same pc?
I'm quite new in the world of software do a career change after 15 long years of sales. So please forgive me if my question is trivial.I downloaded the jdk is 1.7
The two ad JDeveloper 11.1.2 SQL Developer 3.1 requires that the version of jdk used must be1.6.xx. the jdk 1.7 is already installed on my pc. Now, if I download jdk 1.6.xx and install it. I can do it on the same pc? or I have to first uninstall the jdk 1.7 and then install the jdk 1.6.
I intend to work on developing Java EE applications. Can I also have Java EE jdk 1.6 installed on the same pc. With so many JDK, I'm really confused.
Help, please.
Any type of problem. In fact, you can install the 32-bit and 64-bit Java on the same machine without problem.
Java EE jdk 1.6 I have
You're wrong there. JavaEE is only a specifications implemented by an application server. for example, Glassfish or JBoss. You do not install a separate JDK for this, just use the one you already have. Allows you to flatten a bit for you:
-There is only one regular Java for PC: JavaSE or "standard edition". It has many versions, Java 7 is the latest version.
-To be able to run Java applications, you need the Java Runtime, or JRE.
-To be able to build Java applications, you need the SDK Java, or JDK.
-on top of JavaSE there now also JavaFX2, who has his own execution. But even there JavaSE is always the base. You don't need JavaFX passing.
-JavaEE is a specifications related to an important collection of API (JMS, EJB, JPA, etc..)
-Application servers implementing this specification, and provide implementations for the API
You might be confused as how to compile enterprise applications. You build applications using the JDK regular JavaSE (because it contains the Java compiler), but your application will fail compile because you're missing all the APIs that mandate the JavaEE specification. Usually, you deal with this in the framework or a specialized IDE project which adds API appropriate for your project, jars adds jars from the application server to your project or you use something like Maven to manage the dependencies of the company yourself.
What does all this tell you? I'll summarize for you:
-you need a Java JDK 6. Choose the one that matches your CPU architecture
-you need an application server to complete part of the equation JavaEE
-you need a method (IDE, Maven) to correctly incorporate JavaEE dependencies in the classpath of time compiling your project and be able to easily create the "binary" company (war, ejb jar, ear)
That's all. And it's not easy.
Tags: Java
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