fixed setup for kuberneetes

src/main/java/ch/ethz/seb/sebserver/webservice/SEBServerMigrationStrategy.java

@@ -41,21 +41,27 @@ public class SEBServerMigrationStrategy implements FlywayMigrationStrategy {
     @Override
     public void migrate(final Flyway flyway) {
         try {
+
             // If we are in a distributed setup only apply migration task if this is the master service
-            if (this.webserviceInfo.isDistributed()
+            // or if there was no data base initialization yet at all.
-                    && !this.webserviceInfoDAO.isMaster(this.webserviceInfo.getWebserviceUUID())) {
+            if (this.webserviceInfo.isDistributed()) {
+                if (this.webserviceInfoDAO.isInitialized()) {
+                    final boolean isMaster = this.webserviceInfoDAO.isMaster(this.webserviceInfo.getWebserviceUUID());
+                    if (!isMaster) {
+                        log.info(
+                                "Skip migration task since this is not a master instance: {}",
+                                this.webserviceInfo.getWebserviceUUID());
 
-                log.info(
+                        return;
-                        "Skip migration task since this is not a master instance: {}",
+                    }
-                        this.webserviceInfo.getWebserviceUUID());
+                }
-
-                return;
             }
 
             if (this.cleanDBOnStartup) {
                 flyway.clean();
             }
             flyway.migrate();
+
         } catch (final Exception e) {
             log.error("Failed to apply migration task: ", e);
         }

src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/dao/WebserviceInfoDAO.java

@@ -14,6 +14,8 @@ package ch.ethz.seb.sebserver.webservice.servicelayer.dao;
  * the persistent data table. */
 public interface WebserviceInfoDAO {
 
+    boolean isInitialized();
+
     /** Register a SEB webservice within the persistent storage
      *
      * @param uuid A unique identifier that was generated by the webservice on startup

src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/dao/impl/WebserviceInfoDAOImpl.java

@@ -47,6 +47,20 @@ public class WebserviceInfoDAOImpl implements WebserviceInfoDAO {
         this.forceMaster = forceMaster;
     }
 
+    @Override
+    @Transactional
+    public boolean isInitialized() {
+        try {
+            this.webserviceServerInfoRecordMapper
+                    .selectByExample()
+                    .build()
+                    .execute();
+            return true;
+        } catch (final Exception e) {
+            return false;
+        }
+    }
+
     @Transactional
     @Override
     public boolean register(final String uuid, final String address) {

src/main/java/ch/ethz/seb/sebserver/webservice/weblayer/api/ExamAPI_V1_Controller.java

@@ -269,6 +269,10 @@ public class ExamAPI_V1_Controller {
         final String pingNumString = request.getParameter(API.EXAM_API_PING_NUMBER);
         final String instructionConfirm = request.getParameter(API.EXAM_API_PING_INSTRUCTION_CONFIRM);
 
+        if (log.isTraceEnabled()) {
+            log.trace("****************** SEB client connection: {}", connectionToken);
+        }
+
         if (instructionConfirm != null) {
             this.sebClientConnectionService.confirmInstructionDone(connectionToken, instructionConfirm);
         }

src/main/resources/config/application-dev.properties

@@ -11,6 +11,7 @@ logging.level.ch=INFO
 logging.level.org.springframework.cache=INFO
 logging.level.ch.ethz.seb.sebserver.webservice.servicelayer.lms.impl=DEBUG
 logging.level.ch.ethz.seb.sebserver.webservice.servicelayer.session=DEBUG
+logging.level.ch.ethz.seb.sebserver.webservice.weblayer.api.ExamAPI_V1_Controller=TRACE
 
 sebserver.http.client.connect-timeout=150000
 sebserver.http.client.connection-request-timeout=100000