Can't compile vaadin widgetset using gradle and V-Leaflet

Question

I have a spring-vaadin project using vaadin addons and a gradle configuration. Adding V-Leaflet to my project worked the first time, but later it broke and the widgetset never compiled again. The compilation fails reporting it can't find jackson:

:vaadinPluginVersionCheck SKIPPED
:compileJava
:vaadinUpdateWidgetset
:processResources UP-TO-DATE
:classes
:vaadinClassPathJar UP-TO-DATE
:vaadinCompile

Errors in 'org/vaadin/addon/leaflet/shared/Point.java'
Line 37: JsonValue cannot be resolved to a type
Line 3: The import com.fasterxml cannot be resolved
Aborting compile due to errors in some input files
 FAILED

Here is the relevant section in the gradle dependencies section:

compile 'com.fasterxml.jackson.core:jackson-core:2.9.7'
compile 'com.fasterxml.jackson.core:jackson-annotations:2.9.7'
vaadinCompile  'org.peimari:g-leaflet:+' //For v-leaflet
compile  'org.vaadin.addon:v-leaflet:+' //For map fields

I have already tried using vaadinCompile, compile and implementation for all of them.

One possibility is that you have two different versions of Jackson in your class path, and hence class loader cannot determine which JsonValue to use. Typically I am checking the dependency tree in this kind of case and excluding the unwanted transitive dependency, see https://discuss.gradle.org/t/how-do-i-exclude-specific-transitive-dependencies-of-something-i-depend-on/17991 — Tatu Lund, Nov 25 '18 at 08:04
I have tested that but there is no conflict with the available jackson. The vaading gradle plugin developer tried to help me also, with: Have you tried adding the addon on the vaadidnCompile classpath? So it would look like this. // Add addon + its transitive dependencies to GWT compile classpath vaadinCompile 'org.vaadin.addon:v-leaflet:+' // Add addon + its transitive dependencies to Java compile classpath compile 'org.vaadin.addon:v-leaflet:+' But it didn't work. — Lucas Montenegro Carvalhaes, Nov 29 '18 at 21:16

score 1 · Accepted Answer · edited Aug 25 '21 at 10:47

I have solved this.

I don't know exactly what happened but I solved it by updating everything and removing direct access to transitive dependencies within the vaadinCompile step.

The final gradle script is:

vaadinCompile 'org.vaadin.addon:v-leaflet:2.0.9'
compile 'org.vaadin.addon:v-leaflet:2.0.9'

Only adding the vaadinCompile part solved the issue for the jar and running from gradle, but I had to add the compile directive also, so that eclipse could find v-leaflet classes on the classpath.

Can't compile vaadin widgetset using gradle and V-Leaflet

1 Answers1