What is eclipse java

The online help is version-dependent and contains the help for all Eclipse projects of the simultaneous release. The Eclipse webpage also contains a list of relevant resources about Eclipse and Eclipse programming. You find these resources under the following link: Eclipse resources and Eclipse corner wiki. Due to the complexity and extensibility of Eclipse, you will need additional resources to help you solve your specific problems.

Fortunately, the web contains several resources which can help you with your Eclipse problems. Currently, the best places to find, ask and answer questions are the Eclipse forums and Stack Overflow. Try to stay polite with your postings, as the Eclipse community values polite behavior. The Eclipse forums offer several topic-specific forums in which you can post and answer questions. To post or to answer questions in the Eclipse forums, you need a valid user account in the Eclipse bug tracker.

Stack Overflow also requires a user account and its community is very active. Stack Overflow allows to tag questions with the relevant keyword, e. Ensure that you search the forums and mailing lists for solutions for your problem. Somebody else might has asked the same question earlier and the answer is already available. If you encounter a problem with the Eclipse IDE or think about a potential improvement for it, you should report this to the Eclipse project.

The Eclipse bug and feature tracker is using the open source Bugzilla project from Mozilla. In this system, you enter Eclipse error reports.

You can also request new features or improvements of existing features. This bug tracker can be found under Eclipse Bugzilla. Here you can search for existing bugs and review them. To participate actively in the Eclipse bug tracker, you need to create a new account.

This can be done by clicking the Create a New Account link. Once you have a user account, you can login to the Eclipse bug tracker. This allows you to comment on existing bugs and report new ones. The user data for the all Eclipse sites are the same, i. Only for the Gerrit access, different user data is used. As example you can report bugs for the Eclipse platform via the following link: Bug report for the Eclipse platform.

The Eclipse Bugzilla system allows you and the Eclipse committer to enter the bug priority. But overall, it is up to each project do decide how they handle bugs so some variation from project to project will occur. The following rules can be used as guideline. The bug blocks development or testing of the build and no workaround is known. This is the default value for new bug reports. Implies some loss of functionality under specific circumstances, typically the correct setting unless one of the other levels fit.

Represents a request for enhancement also for "major" features that would be really nice to have. In this exercise you use the Bugzilla system to review some of the Eclipse platform bugs. No action is excepted from you, but if you find an updated bug, you should update the bug report and describe that the problem is solved. This exercise uses the Eclipse platform as example but you can use any Eclipse project of your choice.

Open to Eclipse Bugzilla and select the Search button. In most cases Eclipse project have tons of unsolved bugs. If you are looking for existing software bugs, it is recommended to look at the latest bugs, e. Eclipse Forum for asking questions and providing feedback. Eclipse Bug Tracker for reporting errors or feature requests. If you need more assistance we offer Online Training and Onsite training as well as consulting.

Learn more in the Learning Portal. What to do if the Eclipse IDE does not start. Appearance By default, Eclipse ships in a light configuration, if you prefer you can switch to a dark theme via Window Preferences General Appearance menu. Important Eclipse terminology 4. Workspace and projects The workspace is the physical location file path for storing meta-data and optional your development artifacts.

Overview of the user interface Eclipse provides views and editors to navigate and change content. A view is typically used to display structured data and allow to modify it directly. Eclipse projects An Eclipse project contains source, configuration and binary files related to a certain task. The Eclipse Java perspective The following description is a small introduction into important elements of the Java perspective. Package Explorer view The Package Explorer view allows you to browse the structure of your projects and to open files in an editor via a double-click on the file.

Outline view The Outline view shows the structure of the currently selected source file. Problems view The Problems view shows errors and warning messages. Javadoc view The Javadoc view shows the documentation of the selected element in the Java editor. Java editor The Java editor is used to modify the Java source code.

Create project Select File New Java project from the menu. Create package A good naming convention is to use the same name for the top level package and the project.

Run your application code from the IDE Now run your code. Eclipse will run your Java program. You should see the output in the Console view. Run Java program outside Eclipse 7. Select your project, right-click it and select the Export menu entry. Run your program outside Eclipse Open a command shell, e. Exercise: Java project, packages and import statements 8.

Create project Create a new Java project called com. Exporting and importing projects 9. Exporting projects You can export and import Eclipse projects. Exercise: Export and import projects Export your one of your projects into a zip file. Source navigation in the Eclipse IDE Package Explorer or Project Explorer The primary way of navigating through your project is the Package Explorer or alternatively the Project Explorer view.

Link Package Explorer with editor The Package Explorer view allows you to display the associated file from the currently selected editor. Opening a class You can navigate between the classes in your project via the Package Explorer view as described before. You only need to specify part of each segment of the package name. Assume, for example, that you search for the org. Button class. To find this class, you can use the search term org.

Button or o. To avoid suffix matching, you can add a space after the class name. For example, you can type Selection there is a space after selection to match the Selection class but not the SelectionListener class. Open Resource dialog to open arbitrary files You can open any file from your open projects via the Open Resource dialog.

Quick Outline Quick Outline shows you an structured overview of the file you are editing. Open Type Hierarchy The type hierarchy of a class shows you which classes it extends and which interfaces it implements. Full text search You frequently need to find files containing certain text or other meta data. Annotation navigations You can also navigate via the annotation buttons, e. Mouse and keyboard navigation In a lot of cases you can also use the mouse to navigate to or into an element if you press the Ctrl key.

Show in Breadcrumb You can also activate the breadcrumb mode for the Java editor which allows you to navigate the source code directly from the Java editor. To hide it again, right-click on a breadcrump entry and select Hide Breadcrumb. Shortcuts There are a lot of shortcuts available for navigation. Closing and opening projects Closing projects saves memory in Eclipse and can reduce the build time.

To open a closed project double-click on it, or right-click it and select Open Project. Content Assist and Quick Fix Content assist Content assist is a functionality in Eclipse which allows the developer to get context-sensitive code completion in an editor upon user request. Quick Fix Whenever Eclipse detects a problem, it will underline the problematic text in the editor. Exercise: Convert anonymous inner classes to lambda expressions and vice versa The Eclipse IDE has full support for modern Java versions.

You can use a quick fix for the conversion as demonstrated via the following screenshots. Generating code Eclipse has several possibilities to generate code for you. Exercise: code generation and content assists Introduction In this exercise you practice the usage of code generation and the usage of the Content Assists functionality.

Create project Create a project called com. Create class Create the com. Create instances Create a new class called TodoProvider. ArrayList ; import java. Date ; import java. Write a test class Write another TodoProviderTest class with a public static void main String[] args method.

Example implementation of TodoProviderTest While this exercise was about code generation and content assists, you might be interested in a potential solution for this exercise. Refactoring This section covers the refactoring facilities of Eclipse which allow you to improve the structure of your source code. Refactoring Refactoring is the process of restructuring the code without changing its behavior. Refactoring in Eclipse Eclipse supports several refactoring activities, for example, renaming or moving.

Exercise: Refactoring Preparation For the next examples change the MyFirstClass class to the following code. Extract method A useful refactoring is to mark code and create a method from the selected code. After this refactoring the class should look like the following code.

Extract Constant You can also extract strings and create constants based on the strings. Using JARs libraries in Eclipse Adding a Java library to the project classpath You can store JAR files directly in your project, and add them to the classpath which the Java compiler of Eclipse is using. Outside Eclipse you still need to configure your classpath for your project. Using project dependencies You can define in Eclipse that a project is dependent on another project.

Attach source code to a Java library You can open any class by positioning the cursor on the class in an editor and pressing F3. If the source code is not available, the editor shows the bytecode of that class. Attaching the source code to a library also allows you to debug this source code. In the Location path field, enter the path of an archive or a folder containing the source. Add Javadoc to a Java library It is also possible to add Javadoc to a library which you use.

Updates and installation of plug-ins Performing an update If you are behind a network proxy, you have to configure your proxy via the Window Preferences General Network Connection preference setting.

Release specific update site , e. If you select a valid update site, Eclipse allows you to select components and install them. Restarting Eclipse After an update or an installation of a new software component, you should restart Eclipse to make sure that the changes are applied. Eclipse Marketplace Using the Marketplace client Eclipse contains a client which allows installing software components from the Eclipse marketplace. Maintaining your Favorites The marketplace client allows to install your favorite plug-ins directy.

Advanced Eclipse Update manager options Manual installation of plug-ins dropins folder Eclipse plug-ins are distributed as jar files.

Exporting and importing the installed components Eclipse allows you to export a file which describes the installed Eclipse components. Installing features via the command line The Eclipse update manager has a component called director which allows you to install new features via the command line. Eclipse preference settings What are preferences? Opening the preference dialog Select Window Preferences to open the preference dialog. You link to this file via your eclipse.

XXMaxPermSize m --launcher. Identifying preference setting values To identify a key for a certain preference setting you can export existing preference settings via the following approach. You need to remove the scope e. Automatic placement of semicolon Eclipse can make typing more efficient by placing semicolons at the correct position in your source code.

Auto-escape text pasted into Strings Eclipse allows you to escape text automatically if it is pasted into a String literal. Bracket highlighting You can configure Eclipse to highlight the matching brackets of a code block in the source code editor.

You can improve this with type filters, as this reduces the list of possible imports. Completion overwrites and insert guessed method arguments Eclipse can override existing method calls, in case you trigger a code completion in an existing statement. Without this setting you would get the following result, which results in a syntax error.

Auto activation key for code completion Due to Bug this setting is not usable at the moment. Eclipse code checks and cleanup You can define how the Java compiler should react to certain common programming problems. Annotation-based Null analysis You can enable annotation-based null checks in Eclipse via the setting highlighted in the following screenshot.

Running a code cleanup and removal of trailing whitespace Eclipse has the option to perform cleanup actions on existing code. Ensure to unselect any cleanup action which you do not want to perform.

Exercise: Configure save actions and perform code cleanup In this exercise you first configure the Java save actions to cleanup your code during save. Running a batch code cleanup and removal of trailing whitespace Eclipse has the option to perform batch cleanup on existing code. More on preference settings This chapter lists other useful Eclipse settings which are not directly related to Java development. Configuring the editors for a file extension The Editors which are available to open a file can be configured via Window Preferences General Editors File Associations.

Export and import preference settings You can export your preference settings from one workspace via File Export General Preferences. Preference settings per project You can also configure certain preference settings on a per project basis. Using templates and code formatters Press the New button.

Create the following template. In this example the name npm is your keyword for code completion. Code Formatter Eclipse allows you also to specify the settings for formatting the source code.

Code Templates Eclipse can generate source code automatically. Exercise: Custom code template usage Place the cursor after the first bracket after the try statement. Use template Test your template in the Java editor and ensure that it works as expected. Eclipse command line configuration Eclipse memory and performance settings Your Eclipse installation contains a file called eclipse.

These options can also be specified per invocation of the Eclipse IDE, e. For example to start Eclipse with 2GB of memory, use the following command line:. Eclipse startup parameters Eclipse allows you to configure it via startup parameters.

Depending on your platform, you may have to put the path name into double quotes. You find all available runtime options in the Eclipse help if you search for the "Eclipse runtime options" term. Local history for files Local history Eclipse keeps a local history of files which have changed.

Replace files based on local history You can replace files based on the local history. Organizing your workspace with working sets You will create more and more projects in your development career.

Press the New button on the following dialog to create a working set. Tasks Task management You can place markers in the code which you can later access via the Task view. TIP:The Task view shows only the tasks from the currently open projects. Mylyn A more advanced tasks management system is available with the Mylyn plug-in.

Eclipse online resources Online documentations The Eclipse help system is available from within your Eclipse installation as well as online. Web resources The Eclipse webpage also contains a list of relevant resources about Eclipse and Eclipse programming.

Reporting Eclipse bugs and asking questions. Asking and answering questions Due to the complexity and extensibility of Eclipse, you will need additional resources to help you solve your specific problems. Eclipse bug reports and feature requests Reporting bugs and feature requests If you encounter a problem with the Eclipse IDE or think about a potential improvement for it, you should report this to the Eclipse project.

Most Eclipse projects receive lots of bug and feature requests. So if you want something fixed or enhanced you may have to provide a Gerrit review for it. If the Eclipse developer sees that you try to fix the problem yourself, you typically receive more support from them. Using the Eclipse bugzilla system This bug tracker can be found under Eclipse Bugzilla.

Eclipse bug priorities The Eclipse Bugzilla system allows you and the Eclipse committer to enter the bug priority. Using Eclipse Bugzilla In this exercise you use the Bugzilla system to review some of the Eclipse platform bugs. Eclipse Resources See License for license information. Creates a method based on the selected code in the editor. Predefine the Eclipse workspace. Implies "loss of data" or frequent crashes or a severe memory leak. Implies a "major loss of function".

Courses Pricing. What is Eclipse? Architecture As previously mentioned, Eclipse uses plug-ins to provide all the functionality within and on top of the runtime system.

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