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Serialization issues [message #1687964]

Fri, 20 March 2015 01:26

Julien Delange is currently offline

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Messages: 82
Registered: October 2011

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Hello,

I am trying to serialize an eobject from my dsl to a string.

I am using the technique described here: http://jevopisdeveloperblog.blogspot.ch/2011/03/implement-tostring-with-xtexts.html

This is my code snippet:
org.eclipse.xtext.parsetree.reconstr.Serializer serializer = Guice.createInjector(
new org.osate.reqspec.ReqSpecRuntimeModule()).getInstance(
org.eclipse.xtext.parsetree.reconstr.Serializer.class);
String s = serializer.serialize(reqSpecModel);

When trying to run this code, I got the following exeception:
java.lang.ArrayStoreException: org.osate.reqspec.ReqSpecRuntimeModule
at org.osate.alisa.workbench.importer.handlers.Word$2.run(Word.java:90)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)

Any idea about the cause? Is there any other way to serialize an eobject? The serializer class seems to be deprecated.

Thanks for any help/suggestion/comment.

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Re: Serialization issues [message #1688052 is a reply to message #1687964]

Fri, 20 March 2015 04:53

Christian Dietrich is currently offline

Christian Dietrich

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Messages: 14665
Registered: July 2009

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Hi,

IDon't know why you get the arraystore exception. maybe there is something wrong with your classpath setup regarding guice versions.

well first of all you should create the injector the "right" way. For the Standalone usecase:

		Injector i = new MyDslStandaloneSetup().createInjectorAndDoEMFRegistration();

For the UI Usecae: http://koehnlein.blogspot.de/2012/11/xtext-tip-how-do-i-get-guice-injector.html

Regarding the Deprecation: In Your Mwe2 you Decide weather you use the current or the (stoneage) Old Serializer.
If you dont care: simply ask for an org.eclipse.xtext.serializer.ISerializer

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

[Updated on: Fri, 20 March 2015 04:56]

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Re: Serialization issues [message #1688312 is a reply to message #1688052]

Fri, 20 March 2015 13:13

Julien Delange is currently offline

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If I understand correctly, such an approach should be used only if I used a standalone (like a CLI) application, right?

I am in fact serializing within Eclipse and everything is already initialized. Then, I should rather use something like Activator.getInstance().getInjector("") right?

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Re: Serialization issues [message #1688315 is a reply to message #1688312]

Fri, 20 March 2015 13:17

Julien Delange is currently offline

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Update: all the activator are declared in the internal packages. How do I get/use them?

Thanks for any help!

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Re: Serialization issues [message #1688316 is a reply to message #1688315]

Fri, 20 March 2015 13:19

Christian Dietrich is currently offline

Christian Dietrich

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Messages: 14665
Registered: July 2009

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Hi,

where do you call your code from?

Edit:

And no: you should follow the way described in http://koehnlein.blogspot.de/2012/11/xtext-tip-how-do-i-get-guice-injector.html

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

[Updated on: Fri, 20 March 2015 13:22]

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Re: Serialization issues [message #1688381 is a reply to message #1688316]

Fri, 20 March 2015 15:39

Julien Delange is currently offline

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I call my code within Eclipse. This is called within an Eclipse plugin that is using my dsl. I just want to serialize one eobject.

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Re: Serialization issues [message #1688409 is a reply to message #1688381]

Fri, 20 March 2015 16:49

Christian Dietrich is currently offline

Christian Dietrich

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i mean is it a command? is the command defined in the yourdsl.ui plugin etc?

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

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Re: Serialization issues [message #1688414 is a reply to message #1688409]

Fri, 20 March 2015 17:00

Julien Delange is currently offline

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the command is defined in yourdsl.ui.analysis
So, the plugin is loaded with the yourdsl.ui plugin, meaning, in the same eclipse instance.

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Re: Serialization issues [message #1688418 is a reply to message #1688414]

Fri, 20 March 2015 17:13

Julien Delange is currently offline

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Messages: 82
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I then change my code and get the injector fromt he activator. The injector is not null. But when trying to get the serializer, I got the following error related to the class loader. (see below)

Injector injector = org.osate.reqspec.ui.internal.ReqSpecActivator.getInstance().getInjector(
"org.osate.reqspec.ReqSpec");
Serializer serializer = injector.getInstance(Serializer.class);
String s = serializer.serialize(reqSpecModel);
OsateDebug.osateDebug("[WordImport] s=" + s);

An internal error occurred during: "Importing Word Requirements".
loader constraint violation: loader (instance of org/eclipse/osgi/internal/loader/EquinoxClassLoader) previously initiated loading for a different type with name "com/google/inject/Injector"

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Re: Serialization issues [message #1688432 is a reply to message #1688418]

Fri, 20 March 2015 17:36

Christian Dietrich is currently offline

Christian Dietrich

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Messages: 14665
Registered: July 2009

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Hi,

it would be 10000000 times easier if you move the command (handler) to the yourdsl.ui plugin.

or

- you guicify your yourdsl.ui.something by create a own module + exceutableextensionfactory + injector in activator in plugin and use the
IResourceServiceProvider.Registry or IGlobalServiceProvider to obtain the serializer

maybe as a short circuit you can try to

IResourceServiceProvider.Registry.INSTANCE.getResourceServiceProvider(URI.createURI("fake.mydsl")).get(ISerializer,class);
but i dont know if this works

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

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Re: Serialization issues [message #1688439 is a reply to message #1688432]

Fri, 20 March 2015 18:00

Julien Delange is currently offline

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Messages: 82
Registered: October 2011

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Unfortunately, I cannot move the command handler to the plugin. Just a matter of development and dependencies.
1. What is meant by "guicifying"? Do you have some code example in mind? I do not really understand what is meant.
2. I will try this solution, at least, I understand this one Smile

Smile

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Re: Serialization issues [message #1688443 is a reply to message #1688439]

Fri, 20 March 2015 18:14

Julien Delange is currently offline

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Messages: 82
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Making progress. Using the code snippet from solution 2 seems to work. But I get a null pointer exception when serializing.

java.lang.NullPointerException
at org.eclipse.xtext.ui.editor.formatting.PreferenceStoreWhitespaceInformationProvider.getLineSeparatorPreference(PreferenceStoreWhitespaceInformationProvider.java:63)
at org.eclipse.xtext.ui.editor.formatting.PreferenceStoreWhitespaceInformationProvider.getLineSeparatorInformation(PreferenceStoreWhitespaceInformationProvider.java:54)
at org.eclipse.xtext.formatting.impl.AbstractDeclarativeFormatter.getLineSeparatorInfo(AbstractDeclarativeFormatter.java:114)
at org.eclipse.xtext.formatting.impl.AbstractDeclarativeFormatter.createFormattingConfig(AbstractDeclarativeFormatter.java:81)
at org.eclipse.xtext.formatting.impl.AbstractDeclarativeFormatter.getConfig(AbstractDeclarativeFormatter.java:92)
at org.eclipse.xtext.formatting.impl.AbstractDeclarativeFormatter.createFormatterStream(AbstractDeclarativeFormatter.java:75)
at org.eclipse.xtext.serializer.impl.Serializer.serialize(Serializer.java:103)
at org.eclipse.xtext.serializer.impl.Serializer.serialize(Serializer.java:122)
at org.eclipse.xtext.serializer.impl.Serializer.serialize(Serializer.java:51)
at org.osate.alisa.workbench.importer.handlers.Word$2.run(Word.java:93)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)

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Re: Serialization issues [message #1688447 is a reply to message #1688443]

Fri, 20 March 2015 18:26

Christian Dietrich is currently offline

Christian Dietrich

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Messages: 14665
Registered: July 2009

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Which Xtext Version do you use?

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

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Re: Serialization issues [message #1688451 is a reply to message #1688447]

Fri, 20 March 2015 18:33

Julien Delange is currently offline

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2.7.3
Also, I found a workaround: creating a fake resource and putting the eobject in the resource works then! The serializer works now! Thanks a lot!

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Re: Serialization issues [message #1688452 is a reply to message #1688447]

Fri, 20 March 2015 18:35

Christian Dietrich is currently offline

Christian Dietrich

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Messages: 14665
Registered: July 2009

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Looks like you actually found a bug in xtext. can you please file a ticket?

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

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