I recently downloaded VS Code for Java development. When I initially opened an existing Java Project in VS Code, it was unable to identify objects from the Selenium library. I downloaded the Java Extensions plugin and a few others, and now VS code will not recognize any of my imports as valid. Javax and Java.swing are among the now undetectable libraries. Is there a setting I missed? What do you recommend?
VSCode just an Editor, after you install some extensions, it only makes the editor more convenient, get more abilities even can help you develop the project of some kind of language through combine with the language support in your computer. Such as, you need to install JDK, then to install the 'Java' extension, then the extension to combine with the JDK and the VSCode, then you will get the ability to develop java project in VSCode.
That's means, The 'Language Support for Java(TM) by Red Hat' has nothing to do with java development. For example, after you install the JDK on your computer, you can develop java projects in the other IDEAs such as Intellij IDEA or some others. The 'Language Support for Java(TM) by Red Hat' extension just to combine the JDK with VSCode better, to make VSCode better to develop java project.
As you said, you failed to import libraries. Of course, the 'Java' extension without any libraries of java. You need to configure it by yourself. In the Explorer panel, you can find 'JAVA PROJECTS'. In it, you can find which libraries you have referenced and you can adds libraries in it. And of course, you'd better take maven to manage your project.
By the way, recommend you to install 'Java Extension Pack' extension.
You're going to need to add support through extensions because by default VS Code does not support Java. The great thing about this extension is that you get a slue of other extensions as well, such as; maven, debugging tools, support for junit, auto completion, etcetera.
On a side note, you could always use an IDE/IDEA like IntelliJ, Eclipse, or likewise. I'm definitely partial to IntelliJ but they all have their pro's and con's.
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Does the version of Eclipse affect the version of code? Suppose, developers are using different version of Eclipse for same version of code with same version of JDK. Will it cause any issue?
No, the version of Eclipse does not matter.
Eclipse has extensive configuration for exactly which version of Java you are targeting. For example see the 'Java > Compiler' settings in the Preferences, and the 'Compiler Settings' in the Properties for a Java project.
You can also tell Eclipse which JRE/JDKs you have installed (see the 'Java > Installed JREs' page in the Preferences). You can run your code using any of these JREs, this is completely separate from the version of Java you are using the run Eclipse itself.
You do need to run a version of Eclipse which understands the version of Java you want to use. So for Java 13 you need to use at lease Eclipse 2019-12.
Of course newer versions of Eclipse contain more tools for helping with Java development and more bug fixes so using an up to date version is recommeneded.
Eclipse is simply an IDE (Integrated development environment). It combines debugging, compiling and other convenient tools for development. on the other hand, the Java code itself is separate, and you don't necessarily need eclipse to write the code. In fact, a simple text editor is enough. All you need is a file with a java extension (Example: hello.java).
It depends on what users share. I'm assuming you're using some sort of SCM, in which case the same project (fully shared) on different versions of the IDE can possibly lead to annoying situations.
There would be no issues in general, as far as producing the code is concerned, except in situations where some versions of IDEs don't support the required Java version (or other features). But I see this more as the user being affected rather than the project/code.
Here's what you should keep in mind:
Keep IDE project configuration files (such as .project, .settings, .classpath) ignored by your SCM system
All Java configuration should be based on a build tool. Use Maven/Gradle, etc, and any modern IDE will be able to create a project from its config file. The IDE would derive local configuration files which should not be sent back to shared repositories
This way, all developers are free to use whatever IDE (and whatever version) without causing interference, and CI tools will work off build tools' configuration as well.
I want to download/install an Eclipse IDE for Java/Python, but the Eclipse website doesn't indicate which package is suitable for PyDev. Which one should I download/install?
Also, if I need to do Javascript, CSS, HTML or PHP programming, will I need to download/install separate Eclipse IDEs?
Here are the different packages:
Eclipse Packages Website
On the packages page there's a link (easily overlooked, unfortunately) labeled Compare & Combine Packages. That page basically answers your question:
These packages are provided as a convenience to users; they represent common configurations of Eclipse projects that are often used together. However, since Eclipse is, at its core, an expandable platform, you can easily add other features and plugins to any of these packages. Just choose and install the package that most closely meets your needs, then follow these instructions to add features that you need.
This answer is not meant to point a specific offsite resource, but the principle that comes to play here: using eclipse plugins to add a support for a specific language/feature!
First of all, there is no predefined eclipse build for python.
You can simply install the "Java developer" one and then manually add python support via the eclipse marketplace, for example by installing the pydev plugin.
You can go ahead with Eclipse IDE for Java EE Developers.
Once it is installed you can go to Help->Install New Software and can install all other plugins as per your requirements.
For example to install Python use the following Link.
There are different version of eclipse for different development environment.
My question is IF IDE remains same then why different versions, and if someone want to use all supported environments in single IDE how he/she can achieve that.
I want to use eclipse as single IDE for PHP, Java & Reports and Android development, instead of using different installation of eclipse.
Somebody helps me or refer me some link, it's quite confusing!
All the versions of Eclipse on the main site download page are the same version of Eclipse, but packaged with different sets of plugins. You can always install more features in Eclipse by installing more plugins.
You can have a single installation of Eclipse and use it for all your development needs - depending on your tastes however, it may sometimes be more manageable to have separate installations of Eclipse for different tasks (when there are a lot of plugins, Eclipse can take noticeably more time to start.)
There ARE different versions of Eclipse out there. But if we stick to one version and look at why there are different variants to download it's basically just that they come prepackaged with a specific component. So if you would like to use your Eclipse for C++ development you can get going with on single download. Instead of downloading the main IDE and then adding the module to support C++.
But after you install Eclipse, with any prepackaged modules, it's easy to add new ones. Say you have Zend Studio which is a PHP IDE based on Eclipse. You can still add all other modules supported by the version of Eclipse that Zend Studio is based on. For instance the Android SDK kit for Android development. You can add most modules by doing a search for them and finding the url to it's update site. Then click Help->Install New Software. Then you click Add and add the URL of the Update site of the module you wish to install.
Then you can select it from the Work with drop-down and it should appear in the list. Select it and click Next.
That way you can install almost all available modules for Eclipse. Note that sometimes you can run in to compatibility issues between installed modules and dependency problems. But most of the time it works fine.
They are not different versions, just the same backend with plugins for the particular language. Just that the specific versions are configured for best use with the language specified. If you want to use more languages than the default one in the eclipse you downloaded, just download the plugins you require and install in your installation of eclipse
Eclipse is plugin based IDE and these plugins may not like each other sometimes. It will be better to use more installations. In fact if you are developing Java and PHP you will need only 2 of them.
STS is a good Java toolkit especially if you work with spring.
If you new to Eclipse you should know that it can go crazy couple of times per month if you install too much and it is very annoying to see that one day your webapp is deploying and second day no...
Keeping installation separated you will have better control.
I am trying to recompile an existing Java project exported from Eclipse. It is necessary to recompile this because I am running simulations remotely on other machines where a different (older) version of Java is installed. I have tried recompiling my .java file which specifies the simulation in question. However, it appears that it is necessary to recompile all other classes etc as well. Has anyone got an idea how to do this WITHOUT using Eclipse (I am not the Admin on the other machines and thus Eclipse is unavailable to me) and not manually because the project is quite huge?
Thanks a lot for any suggestions!
I recommend you to always have an command line way to build an application. The usual way to do this in Java is using ANT (or Maven).
As #Santiago Lezica says, Eclipse can generate an Ant file.
I believe that Eclipse allows you to build for an older target platform than the one you are currently running. That way you can do all of your builds locally.
The second approach has the advantage that you can fix any problems arising from compiling for the older platforms (e.g. use of new language features, use of new classes / methods) from the comfort of your own ... workstation.
There is another option that you should consider: Tell Eclipse to generate code for the old Java version (see the compiler options). That way, you can create code that runs on Java 1.3, even if Eclipse uses Java 5.
Not sure what your requirements are, but you could set the compiler level for your projects at the (older) level of your Linux installs. This would cause Eclipse to recompile it at that version, instead of a newer version.
At my company we use IBM's Rational Application Developer (instead of pure Eclipse), but I am assuming the option is in the same spot. If you right-click on your project, you can go to the Java Compiler options and then set the compatibility to the level of that on Linux (1.3, 1.4, etc.).
Since compile Java byte-code is supposed to be portable (for the most part), this should get you past most of your problems.
Otherwise, the other option is to use something like Ant or Maven scripts (which can be kicked off by Eclipse) and then just use a property to set the compiler right before you run it. This way you don't have to switch properties on your projects all the time, if you truly do need "newer" compiled code and can't live with "older" code on both systems.
I want to develop a Java application mixing java with jython. I am using the IDE Netbeans with the python plugin. How do i work on this? (There is a built in support for Groovy with javaSE from IDE call Groovy classes from Java code, and Java classes from Groovy code but not for jython)
ref: http://www.netbeans.org/features/groovy/index.html
Netbeans 6.5 supports both Python and Jython.
http://www.netbeans.org/features/python/
Assuming you are using that version with the Python plug-in, it's just a matter of setting the runtime you wish to use via the platform manager (here's where you would choose Jython).
alt text http://img15.imageshack.us/img15/1586/platformmanager.png
I would also want to add that since 6.5 release, the Python bits have been vastly improved upon. So, if you want to try the new but unstable builds, please grab one from http://deadlock.netbeans.org/hudson/job/python/
Also, please refer to various documents linked from http://wiki.netbeans.org/Python and my blog posts at http://amitksaha.blogspot.com/search/label/nbpython
In case of problems, please let us know on the mailing list.
If you want to develop a Java application that blends with Jython and works outside NetBeans, then NB's ability to use Jython runtime doesn't help much. Instead, you have basically two choices:
You can compile your Python to Java classes using jythonc.
Or: you can embed the Jython interpreter inside your Java app.
To embed, you need to create a Jython library to be included in your Java app. Do this by going to Tools -> Libraries, select New Library, and add the stuff at NetBeans' Jython directory there (C:\Program Files\NetBeans 6.5\python1\jython-2.5 in my machine). You need jython.jar and at least most of the stuff at the javalib directory.