GLSP-1509: Fix maven build (#255)

- Use correct qualified snapshot version
- Add explicit TypeAdapter for ELists to Graph JSON configurator
  (required due to a breaking change in GSON 2.13)

Fixes  eclipse-glsp/glsp/issues/1509

Author: tortmayr

plugins/org.eclipse.glsp.graph/src/org/eclipse/glsp/graph/gson/GraphGsonConfigurator.java

@@ -21,6 +21,8 @@
 import java.util.List;
 import java.util.Map;
 
+import org.eclipse.emf.common.util.BasicEList;
+import org.eclipse.emf.common.util.EList;
 import org.eclipse.emf.ecore.EClass;
 import org.eclipse.emf.ecore.EClassifier;
 import org.eclipse.emf.ecore.EObject;
@@ -29,6 +31,7 @@
 import org.eclipse.glsp.graph.GraphPackage;
 
 import com.google.gson.GsonBuilder;
+import com.google.gson.InstanceCreator;
 
 public class GraphGsonConfigurator {
 
@@ -58,6 +61,7 @@ public GraphGsonConfigurator withEPackages(final EPackage... packages) {
    public GsonBuilder configureGsonBuilder(final GsonBuilder gsonBuilder) {
       gsonBuilder.registerTypeAdapterFactory(new EMapTypeAdapter.Factory());
       gsonBuilder.registerTypeAdapterFactory(new GModelElementTypeAdapter.Factory(DEFAULT_TYPE_ATT, typeMap));
+      gsonBuilder.registerTypeAdapter(EList.class, (InstanceCreator<EList<?>>) type -> new BasicEList<>());
       configureClassesOfPackages(gsonBuilder);
       gsonBuilder.addSerializationExclusionStrategy(new EObjectExclusionStrategy());
       return gsonBuilder;

releng/org.eclipse.glsp.feature/feature.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <feature
       id="org.eclipse.glsp.feature"
-      label="GLSP SDK"
+      label="GLSP SDK (Core)"
       version="2.4.0.javax"
       provider-name="Eclipse GLSP">