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Vaadin 8 + compatibility = widgetset implementation missing for v7 componen

Krzysztof Cichomski
6 years ago Jan 24, 2017 10:24am
Alejandro Duarte
6 years ago Jan 24, 2017 2:29pm

Hi, good to know that you are enjoying the new version :) Check the following:

  • You have to replace the vaadin-server dependency with vaadin-compatibility-server.
  • If you are using the default widgetset (you are not compiling it by yourself):
    • Replace the vaadin-client-compiled dependency with vaadin-compatibility-client-compiled.
    • Add @Widgetset("com.vaadin.v7.Vaadin7WidgetSet") to your UI implementations.

  • If you are using a custom widgetset:
    • Replace the vaadin-client dependency with vaadin-compatibility-client.
    • Recompile it.
Krzysztof Cichomski
6 years ago Jan 24, 2017 3:44pm
Alejandro Duarte
6 years ago Jan 24, 2017 4:13pm

If you are using Vaadin Charts, that means you have a custom widgetset, so you cannot use the "default" Vaadin7Widgetset. I assume you have a module descriptor, say com/example/Widgetset.gwt.xml file. there, you should have at least:

<inherits name="com.vaadin.DefaultWidgetSet" />
<inherits name="com.vaadin.v7.Vaadin7WidgetSet" />
<inherits name="com.vaadin.addon.charts.Widgetset" />

When compiling with Maven this should be done automatically. You should also have the following in you UI implementation:

public class YourUI extends UI { ... }

I tested it, and it works :) For completeness, here's the full dependencies section of the pom.xml file I used:


Krzysztof Cichomski
6 years ago Jan 24, 2017 9:55pm

I thought the dark days of XYZWidgetset.gwt.xml have ended since vaadin 7.7 - I for sure was glad having the configuration simplified. Too bad I had to reintroduce it again, is this temporary ?

Anyways I managed to have everything up and running according to your instructions. 

However... everything is fine when using 8.0.0.beta1, but when I switch to 8.0-SNAPSHOT (which is what I REALLY want), I get an OutOfMemoryError:

[INFO] Compiling module MyAppWidgetset
[ERROR] Exception in thread "main" java.lang.OutOfMemoryError: GC overhead limit exceeded
[ERROR]     at org.eclipse.jdt.internal.compiler.util.HashtableOfObject.<init>(HashtableOfObject.java:38)
[ERROR]     at org.eclipse.jdt.internal.compiler.codegen.ConstantPool.<init>(ConstantPool.java:309)
[ERROR]     at org.eclipse.jdt.internal.compiler.ClassFile.<init>(ClassFile.java:271)
[ERROR]     at org.eclipse.jdt.internal.compiler.ClassFilePool.acquire(ClassFilePool.java:45)
[ERROR]     at org.eclipse.jdt.internal.compiler.ClassFile.getNewInstance(ClassFile.java:259)
[ERROR]     at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.generateCode(TypeDeclaration.java:537)
[ERROR]     at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.generateCode(TypeDeclaration.java:636)
[ERROR]     at org.eclipse.jdt.internal.compiler.ast.CompilationUnitDeclaration.generateCode(CompilationUnitDeclaration.java:371)
[ERROR]     at org.eclipse.jdt.internal.compiler.Compiler.process(Compiler.java:872)

I'll try to increase memory available for maven using MAVEN_OPTS and post back, but anyway this not good news.


Krzysztof Cichomski
6 years ago Jan 24, 2017 10:08pm
Marco Collovati
6 years ago Jan 24, 2017 10:25pm
Krzysztof Cichomski
6 years ago Jan 25, 2017 9:38am
Krzysztof Cichomski
6 years ago Jan 25, 2017 11:21am
eugen hanussek
5 years ago Aug 14, 2017 4:20pm

I tested the jpacontainer-addressbook-demo with vaadin 8.1.1 and connat make it run.
Thanks to Alejandro's hints I could fix the problems.
Now it's runnung.

Taurai Benhura
5 years ago Sep 07, 2017 2:11pm
Kevin Cruijssen
5 years ago Sep 12, 2017 3:35pm
Alejandro Duarte
5 years ago Sep 12, 2017 3:58pm
Taurai Benhura
5 years ago Sep 12, 2017 4:00pm