fixed a NPE and a serialization problem

apps/dnet-exporter-api/src/main/java/eu/dnetlib/openaire/community/CommunityService.java

@@ -49,6 +49,7 @@ import eu.dnetlib.openaire.exporter.model.context.ConceptSummary;
 public class CommunityService {
 
 	// TODO: Verificare Tickets: #8835, #8854, #6483, #3259, #3494
+	// L'IMPORT DI ALCUNI PROGETTI FALLISCE perche' non hanno openaireID
 
 	@Autowired
 	private DbCommunityRepository dbCommunityRepository;

apps/dnet-exporter-api/src/main/java/eu/dnetlib/openaire/community/importer/CommunityImporterController.java

@@ -6,7 +6,11 @@ import java.util.Map;
 import java.util.Set;
 import java.util.stream.Collectors;
 
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.web.bind.annotation.CrossOrigin;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
@@ -17,8 +21,14 @@ import eu.dnetlib.openaire.common.ISClient;
 import eu.dnetlib.openaire.community.model.DbOrganization;
 import eu.dnetlib.openaire.exporter.exceptions.CommunityException;
 import eu.dnetlib.openaire.exporter.model.context.Context;
+import io.swagger.v3.oas.annotations.tags.Tag;
 
 @RestController
+@CrossOrigin(origins = {
+	"*"
+})
+@ConditionalOnProperty(value = "openaire.exporter.enable.community", havingValue = "true")
+@Tag(name = "OpenAIRE Communities: Migration API", description = "OpenAIRE Communities: Migration API")
 public class CommunityImporterController {
 
 	public final static Set<String> communityBlackList = Sets.newHashSet("fet-fp7", "fet-h2020");
@@ -29,8 +39,11 @@ public class CommunityImporterController {
 	@Autowired
 	private ISClient isClient;
 
+	private static final Log log = LogFactory.getLog(CommunityImporterController.class);
+
 	@GetMapping("/community_importer/communities")
 	public List<String> importProfiles() throws CommunityException {
+		try {
 			final Map<String, Context> contextMap = getContextMap();
 
 			final List<String> list = contextMap.keySet()
@@ -43,6 +56,10 @@ public class CommunityImporterController {
 			});
 
 			return list;
+		} catch (final Throwable e) {
+			log.error("Error importing communities", e);
+			throw new CommunityException(e.getMessage());
+		}
 	}
 
 	@GetMapping("/community_importer/propagationOrgs")

apps/dnet-exporter-api/src/main/java/eu/dnetlib/openaire/community/importer/CommunityImporterService.java

@@ -136,8 +136,12 @@ public class CommunityImporterService {
 			final List<CommunityContentprovider> datasources =
 				getCommunityInfo(context, CONTENTPROVIDERS_ID_SUFFIX, c -> asCommunityDataprovider(context.getId(), c));
 
+			// TODO: REMOVE THIS FILTER ?
 			final List<CommunityProject> projects =
-				getCommunityInfo(context, PROJECTS_ID_SUFFIX, c -> asCommunityProject(context.getId(), c));
+				getCommunityInfo(context, PROJECTS_ID_SUFFIX, c -> asCommunityProject(context.getId(), c))
+					.stream()
+					.filter(p -> p.getOpenaireId() != null)
+					.collect(Collectors.toList());
 
 			final List<CommunityOrganization> orgs =
 				getCommunityInfo(context, ORGANIZATION_ID_SUFFIX, c -> asCommunityOrganization(context.getId(), c));

apps/dnet-exporter-api/src/main/java/eu/dnetlib/openaire/community/utils/CommunityMappingUtils.java

@@ -216,7 +216,7 @@ public class CommunityMappingUtils {
 	}
 
 	private static String[] toStringArray(final List<String> list) {
-		return list.toArray(new String[list.size()]);
+		return list != null ? list.toArray(new String[list.size()]) : new String[0];
 	}
 
 }

libs/dnet-exporter-model/src/main/java/eu/dnetlib/openaire/exporter/model/context/Param.java

@@ -1,6 +1,10 @@
 package eu.dnetlib.openaire.exporter.model.context;
 
-public class Param {
+import java.io.Serializable;
+
+public class Param implements Serializable {
+
+	private static final long serialVersionUID = -1534376651378828800L;
 
 	private String name;