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Hovers on Keywords [message #1725241]

Wed, 02 March 2016 04:55

Arshad Adavani

Messages: 163
Registered: July 2013
Location: Bangalore

Senior Member

Hi,

I am using Xtext version:2.4.3. I wanted to implement a hover based help. I referred to this link https://borisdevnotes.wordpress.com/2014/02/28/xtext-usability-hovers-on-keywords/ and have followed the same steps mentioned. The compilation fails and throws a google inject exception (infinite number of times). It occurs in the class which extends org.eclipse.xtext.xbase.ui.hover.XbaseHoverProvider

public class MyXbaseHoverProvider extends XbaseHoverProvider

Am I doing something wrong here?

Exception details:

Caused by: com.google.inject.internal.util.$ComputationException: com.google.inject.internal.util.$ComputationException: com.google.inject.internal.util.$ComputationException: 
.
.
.
com.google.inject.internal.util.$ComputationException: com.google.inject.internal.util.$ComputationException: java.lang.StackOverflowError
	at com.google.inject.internal.util.$MapMaker$StrategyImpl.compute(MapMaker.java:553)
	at com.google.inject.internal.util.$MapMaker$StrategyImpl.compute(MapMaker.java:419)
	at com.google.inject.internal.util.$CustomConcurrentHashMap$ComputingImpl.get(CustomConcurrentHashMap.java:2041)
	at com.google.inject.internal.FailableCache.get(FailableCache.java:50)
	at com.google.inject.internal.MembersInjectorStore.get(MembersInjectorStore.java:65)
	at com.google.inject.internal.ConstructorInjectorStore.createConstructor(ConstructorInjectorStore.java:73)
	at com.google.inject.internal.ConstructorInjectorStore.access$000(ConstructorInjectorStore.java:28)
	at com.google.inject.internal.ConstructorInjectorStore$1.create(ConstructorInjectorStore.java:36)
	at com.google.inject.internal.ConstructorInjectorStore$1.create(ConstructorInjectorStore.java:32)
	at com.google.inject.internal.FailableCache$1.apply(FailableCache.java:39)
	at com.google.inject.internal.util.$MapMaker$StrategyImpl.compute(MapMaker.java:549)
	... 508 more

Arshad

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Re: Hovers on Keywords [message #1725246 is a reply to message #1725241]

Wed, 02 March 2016 06:24

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

hi how did you implement the hover provider? what happens when you leave the class empty? can you share the part of the stack trace that does the actual overflow as well?

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Hovers on Keywords [message #1725317 is a reply to message #1725246]

Wed, 02 March 2016 13:43

Arshad Adavani

Messages: 163
Registered: July 2013
Location: Bangalore

Senior Member

Hi Christian,

I have done exactly as mentioned in the link shared in the previous post. Added the same classes and have done the binding in the UiModule. As soon as i start the plugin, the exception starts printing on console from Activator. I also made MyXbaseHoverProvider empty and still the exception occurs.

Found a working solution:
Instead of extending XbaseHoverProvider as before, I extended DefaultEObjectHoverProvider and this seems to work and also provide the keyword hover functionality I required.

Thanks.

Arshad

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Re: Hovers on Keywords [message #1725320 is a reply to message #1725317]

Wed, 02 March 2016 13:51

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

do you use xbase or dont you?

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Hovers on Keywords [message #1725323 is a reply to message #1725320]

Wed, 02 March 2016 14:09

Arshad Adavani

Messages: 163
Registered: July 2013
Location: Bangalore

Senior Member

Hi,
I use xbase for identifying the Keywords(XbaseDispatchingEObjectTextHover).
Since extending XbaseHoverProvider was throwing exceptions, I extended DefaultEObjectHoverProvider which is the parent class of XbaseHoverProvider.

Arshad

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