Eclipse Interview Questions And Answers

Eclipse Interview Questions list for experienced

  1. When does a plugin get started?
  2. What are extensions and extension points?
  3. How to access UI objects from a non-ui thread?
  4. How to fire a key event in my test code to make the program act as if a user pressed a key?
  5. Why do I get the error \"org.eclipse.swt.SWTException: Invalid thread access\"?
  6. How to config a plugin to start automatically during platform starts up?
  7. What is the classpath of a plug-in?
  8. Do we need to explicitly invoke org.eclipse.swt.graphics.Image.dispose()?
  9. What is Display, what is Shell?
  10. How to resize my shell to get my changed widgets to lay out again?
  11. Is there a built-in facility to check whether a given value is valid compared to the effective facets of its type?
  12. How can I change the window icon in my application?
  13. What is optional dependency?
  14. What is EMF?
  15. What is included in the Rich Client Platform?
  16. What are the differences between Require-Bundle and Import-Package?
  17. How to import the javax.servlet API in Eclipse project?
  18. ho to solve \"Debug certificate expired" error in Eclipse Android plugins?
  19. How to enable LogCat/Console in Eclipse for Android?
  20. How can you speed up Eclipse?
  21. how to solve error exit code=13when Can\'t start Eclipse and Java was started??
  22. Eclipse giving error, missing R.java file after recent update?
  23. How to set the java.library.path from Eclipse
  24. How to run eclipse in clean mode? and what happens if we do so?
  25. What is the difference between javac and the Eclipse compiler?
  26. How to turn off the Eclipse code formatter for certain sections of Java code?

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Top Eclipse interview questions and answers for freshers and experienced

What is Eclipse ?

Answer : Eclipse is an open source IDE and platform for building applications. There is a wide variety of plugins for various programming languages and other development-oriented tools (such as modeling, database browsing, etc). This tag should only be used for questions specifically about the Eclipse IDE or platform, not for generalized (Java, Android, etc) programming topic

Questions : 1 :: When does a plugin get started?

Each plug-in can be viewed as having a declarative section and a code section. The declarative part is contained in the plugin.xml file. This file is loaded into a registry when the platform...View answers

Questions : 2 :: What are extensions and extension points?

Loose coupling in Eclipse is achieved partially through the mechanism of extensions and extension points. When a plug-in wants to allow other plug-ins to extend or customize portions of its...View answers

Questions : 3 :: How to access UI objects from a non-ui thread?


Use Display.getDefault().asyncExec(new Runnable()...) Display.asyncExec causes the run() method of the runnable to be invoked by the user-interface thread at the next reasonable opportunity....View answers

Questions : 4 :: How to fire a key event in my test code to make the program act as if a user pressed a key?

Two ways to implement it in code: generating OS level key event use Display.post(Event) or use Widge.notifyListeners(...) to just notify a widget's...View answers

Questions : 5 :: Why do I get the error "org.eclipse.swt.SWTException: Invalid thread access"?

SWT implements a single-threaded UI model often called apartment threading. In this model, only the UI-thread can invoke UI operations. SWT strictly enforces this rule. If you try and access...View answers

Questions : 6 :: How to config a plugin to start automatically during platform starts up?


Define the 'Eclipse-AutoStart=true' header in Manifest...View answers

Questions : 7 :: What is the classpath of a plug-in?

The OSGi parent class loader. (Java boot class loader by default); The exported libraries of all imported plug-ins; The declared libraries of the plug-in and all its...View answers

Questions : 8 :: Do we need to explicitly invoke org.eclipse.swt.graphics.Image.dispose()?

Application code must explicitly invoke the Image.dispose() method to release the operating system resources managed by each instance when those instances are no longer required. This is...View answers

Questions : 9 :: What is Display, what is Shell?


The Display class respresents the GUI process(thread), the Shell class represents...View answers

Questions : 10 :: How to resize my shell to get my changed widgets to lay out again?

A layout is only performed automatically on a Composite's children when the Composite is resized, including when it is initially shown. To make a Composite lay out its children under any...View answers

Questions : 11 :: Is there a built-in facility to check whether a given value is valid compared to the effective facets of its type?

To determine if a literal is valid with respect to a simple type, you can use either XSDSimpleTypeDefinition.isValidLiteral or...View answers

Questions : 12 :: How can I change the window icon in my application?

Define a product via the products extension point and specify the windowImages property to refer to two image files, a 16x16 one and a 32x32...View answers

Questions : 13 :: What is optional dependency?

plug-in prerequisite elements can be made optional by adding the optional="true" attribute in Manifest file(see below for an example). Marking an import as optional simply states that if...View answers

Questions : 14 :: What is EMF?

The Eclipse Modeling Framework is a Java/XML framework for generating tools and other applications based on simple class models. EMF helps you rapidly turn models into efficient, correct, and...View answers

Questions : 15 :: What is included in the Rich Client Platform?

Eclipse Runtime, SWt, JFace,...View answers

Questions : 16 :: What are the differences between Require-Bundle and Import-Package?

There are two complementary ways of depending on something from outside a given plug-in; Require-Bundle and...View answers

Questions : 17 :: How to import the javax.servlet API in Eclipse project?

 simply copy the servlet-api.jar and copy that jar files into lib folder, which is in WEB-INF. then just clean and built your project, your errors will be solved. **OR**directly add jar files...View answers

Questions : 18 :: ho to solve "Debug certificate expired" error in Eclipse Android plugins?

Delete your debug certificate under ~/.android/debug.keystore on Linux and Mac OS X; the directory is something like %USERPROFILE%/.androidon Windows. The Eclipse plugin should then generate a new...View answers

Questions : 19 :: How to enable LogCat/Console in Eclipse for Android?

In Eclipse, Goto Window-> Show View -> Other -> Android-> Logcat. Logcat is nothing but a console of your Emulator or Device. System.out.println does not work in Android. So you have to...View answers

Questions : 20 :: How can you speed up Eclipse?

The three most influential factors for Eclipse speed are: using the latest version of Eclipse (3.4 Ganimede at the time of writing in 2008)Note that David Balaic's comment (July 2014) contradicts...View answers

Questions : 21 :: how to solve error exit code=13when Can't start Eclipse and Java was started??

To check your version of Java, run java -version in a console (command prompt). On Windows 7 with 64-bit Java 6 I get: java version "1.6.0_27" Java(TM) SE Runtime Environment (build 1.6.0_27-b07)...View answers

Questions : 22 :: Eclipse giving error, missing R.java file after recent update?

Follow These steps... Right Click Your Project.Select Properties->Android Check Project Build Target and API Level.Again come back and open Android Sdk Manager Chekc the Tools and make sure you...View answers

Questions : 23 :: How to set the java.library.path from Eclipse

Don't mess with the library path! Eclipse builds it itself! Instead, go into the library settings for your projects and, for each jar/etc that requires a native library, expand it in the...View answers

Questions : 24 :: How to run eclipse in clean mode? and what happens if we do so?

For clean mode: start the platform like eclipse -cleanThat's all. The platform will clear some cached OSGi bundle information, it helps or is recommended if you install new plugins manually or...View answers

Questions : 25 :: What is the difference between javac and the Eclipse compiler?

Eclipse has implemented its own compiler called as Eclipse Compiler for Java (ECJ). It is different from the javac, the compiler that is shipped with Sun JDK. One notable difference is that the...View answers

Questions : 26 :: How to turn off the Eclipse code formatter for certain sections of Java code?

You have to turn on the ability to add the formatter tags. In the menubar go to: Windows → Preferences → Java → Code Style → Formatter Press the "Edit" button. Choose the last...View answers
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