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Maven parallel build with Xtext [message #1778034]

Fri, 08 December 2017 12:14

Dietmar Stoll

Messages: 1
Registered: September 2016

Junior Member

Is it possible to use the Maven parallel build option for projects with the xtext-maven-plugin?
When using it for a parent project that has multiple modules, I get stack traces as listed below.

mvn -T 4 install # four threads

[ERROR] Error executing EValidator
java.lang.NullPointerException
at org.eclipse.xtext.validation.CompositeEValidator.validate(CompositeEValidator.java:151)
at org.eclipse.emf.ecore.util.Diagnostician.doValidate(Diagnostician.java:171)
at org.eclipse.emf.ecore.util.Diagnostician.validate(Diagnostician.java:158)
at org.eclipse.emf.ecore.util.Diagnostician.validate(Diagnostician.java:137)
at org.eclipse.xtext.validation.CancelableDiagnostician.validate(CancelableDiagnostician.java:39)
at org.eclipse.emf.ecore.util.Diagnostician.doValidateContents(Diagnostician.java:185)
at org.eclipse.xtext.validation.CancelableDiagnostician.doValidateContents(CancelableDiagnostician.java:70)
at org.eclipse.xtext.xbase.validation.XbaseDiagnostician.doValidateContents(XbaseDiagnostician.java:46)
at org.eclipse.emf.ecore.util.Diagnostician.validate(Diagnostician.java:161)
at org.eclipse.emf.ecore.util.Diagnostician.validate(Diagnostician.java:137)
at org.eclipse.xtext.validation.CancelableDiagnostician.validate(CancelableDiagnostician.java:39)
at org.eclipse.emf.ecore.util.Diagnostician.validate(Diagnostician.java:120)
at org.eclipse.xtext.validation.ResourceValidatorImpl.validate(ResourceValidatorImpl.java:146)
at org.eclipse.xtext.xbase.annotations.validation.DerivedStateAwareResourceValidator.validate(DerivedStateAwareResourceValidator.java:32)
at org.eclipse.xtext.validation.ResourceValidatorImpl.validate(ResourceValidatorImpl.java:90)
at org.eclipse.xtext.builder.standalone.StandaloneBuilder.validate(StandaloneBuilder.java:378)
at org.eclipse.xtext.builder.standalone.StandaloneBuilder.launch(StandaloneBuilder.java:267)
at org.eclipse.xtext.maven.XtextGenerator.internalExecute(XtextGenerator.java:165)
at org.eclipse.xtext.maven.XtextGenerator.execute(XtextGenerator.java:142)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call(MultiThreadedBuilder.java:185)
at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call(MultiThreadedBuilder.java:181)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
[ERROR] Error executing EValidator
java.lang.NullPointerException
at org.eclipse.xtext.validation.CompositeEValidator.validate(CompositeEValidator.java:151)
at org.eclipse.emf.ecore.util.Diagnostician.doValidate(Diagnostician.java:171)
at org.eclipse.emf.ecore.util.Diagnostician.validate(Diagnostician.java:158)
at org.eclipse.emf.ecore.util.Diagnostician.validate(Diagnostician.java:137)
at org.eclipse.xtext.validation.CancelableDiagnostician.validate(CancelableDiagnostician.java:39)
... and so on

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Re: Maven parallel build with Xtext [message #1778175 is a reply to message #1778034]

Mon, 11 December 2017 13:41

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

i have doubts this was ever tested
you you open a ticket with a reproducible example at
https://github.com/eclipse/xtext-maven/issues

but i have doubts that this can be fixed at all. emf and xtext is very bad when it comes to parallel processing

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

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