[VIVO-1755] - Better error handling when reasoner disabled (#137)

* Better error handling when reasoner disabled

* Change reasoner error log message to debug

* Extend reasoner status error handling

* Improve reasoner error log message and extend to JenaAdminActions

* Bump up log level for admin action to 'warn' and edit admin panel error message

api/src/main/java/edu/cornell/mannlib/vitro/webapp/controller/freemarker/BaseSiteAdminController.java

@@ -199,6 +199,7 @@ public class BaseSiteAdminController extends FreemarkerHttpServlet {
 
             String error = null;
             String explanation = null;
+            try {
                 TBoxReasonerStatus status = ApplicationUtils.instance().getTBoxReasonerModule().getStatus();
                 if (!status.isConsistent()) {
                     error = "INCONSISTENT ONTOLOGY: reasoning halted.";
@@ -206,6 +207,10 @@ public class BaseSiteAdminController extends FreemarkerHttpServlet {
                 } else if ( status.isInErrorState() ) {
                     error = "An error occurred during reasoning. Reasoning has been halted. See error log for details.";
                 }
+            } catch (IllegalStateException e) {
+                error = "The inferencing engine is disabled. Data entered manually may exhibit unexpected behavior prior to inferencing.";
+                log.debug("Status of reasoner could not be determined. It is likely disabled.", e);
+            }
 
             if (error != null) {
                 Map<String, String> tboxReasonerStatus = new HashMap<String, String>();

api/src/main/java/edu/cornell/mannlib/vitro/webapp/controller/jena/JenaAdminActions.java

@@ -192,6 +192,7 @@ public class JenaAdminActions extends BaseEditController {
 	}
 
     private void printRestrictions() {
+		try {
 			TBoxReasonerModule reasoner = ApplicationUtils.instance().getTBoxReasonerModule();
 			for (Restriction rest : reasoner.listRestrictions() ) {
 				if (rest.isAllValuesFromRestriction()) {
@@ -213,7 +214,10 @@ public class JenaAdminActions extends BaseEditController {
 				for (Resource inst : rest.listInstances().toList() ) {
 					log.trace("     "+inst.getURI());
 				}
-
+			}
+		}
+		catch (IllegalStateException e) {
+			log.warn("Status of reasoner could not be determined. It is likely disabled", e);
 		}
     }
 

api/src/main/java/edu/cornell/mannlib/vitro/webapp/dao/jena/DataPropertyDaoJena.java

@@ -360,8 +360,13 @@ public class DataPropertyDaoJena extends PropertyDaoJena implements
     }
 
     protected boolean reasoningAvailable() {
+        try {
             TBoxReasonerStatus status = ApplicationUtils.instance().getTBoxReasonerModule().getStatus();
             return status.isConsistent() && !status.isInErrorState();
+        } catch (IllegalStateException e) {
+            log.debug("Status of reasoner could not be determined. It is likely disabled.", e);
+            return false;
+        }
     }
 
     private String getRequiredDatatypeURI(Individual individual, DataProperty dataprop, List<String> vclassURIs) {

api/src/main/java/edu/cornell/mannlib/vitro/webapp/edit/n3editing/VTwo/fields/IndividualsViaVClassOptions.java

@@ -8,6 +8,9 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
 import edu.cornell.mannlib.vitro.webapp.application.ApplicationUtils;
 import edu.cornell.mannlib.vitro.webapp.beans.Individual;
 import edu.cornell.mannlib.vitro.webapp.dao.IndividualDao;
@@ -17,6 +20,8 @@ import edu.cornell.mannlib.vitro.webapp.modules.tboxreasoner.TBoxReasonerStatus;
 
 public class IndividualsViaVClassOptions implements FieldOptions {
 
+    protected static final Log log = LogFactory.getLog(IndividualsViaVClassOptions.class.getName());
+
     public static final String LEFT_BLANK = "";
     protected List<String> vclassURIs;
     protected String defaultOptionLabel;
@@ -102,8 +107,13 @@ public class IndividualsViaVClassOptions implements FieldOptions {
     }
 
     protected boolean isReasoningAvailable(){
+    	try {
             TBoxReasonerStatus status = ApplicationUtils.instance().getTBoxReasonerModule().getStatus();
             return status.isConsistent() && !status.isInErrorState();
+        } catch (IllegalStateException e) {
+            log.debug("Status of reasoner could not be determined. It is likely disabled.", e);
+            return false;
+        }
     }
 
     protected Map<String, Individual> addWhenMissingInference( String classUri , WebappDaoFactory wDaoFact ){