GH-5148 improved error message

Author: hmottestad

core/sail/nativerdf/src/main/java/org/eclipse/rdf4j/sail/nativerdf/ValueStore.java

@@ -227,7 +227,7 @@ public <T extends NativeValue & Resource> T getResource(int id) throws IOExcepti
 				return (T) new CorruptIRIOrBNode(revision, id, ((CorruptValue) resultValue).getData());
 			}
 			logger.warn(
-					"Possible corrupt data consider setting the system property org.eclipse.rdf4j.sail.nativerdf.softFailOnCorruptDataAndRepairIndexes to true");
+					"NativeStore is possibly corrupt. To attempt to repair or retrieve the data, read the documentation on http://rdf4j.org about the system property org.eclipse.rdf4j.sail.nativerdf.softFailOnCorruptDataAndRepairIndexes");
 		}
 
 		return (T) resultValue;
@@ -252,7 +252,7 @@ public <T extends NativeValue & IRI> T getIRI(int id) throws IOException {
 				return (T) new CorruptIRI(revision, id, null, ((CorruptValue) resultValue).getData());
 			}
 			logger.warn(
-					"Possible corrupt data consider setting the system property org.eclipse.rdf4j.sail.nativerdf.softFailOnCorruptDataAndRepairIndexes to true");
+					"NativeStore is possibly corrupt. To attempt to repair or retrieve the data, read the documentation on http://rdf4j.org about the system property org.eclipse.rdf4j.sail.nativerdf.softFailOnCorruptDataAndRepairIndexes");
 		}
 
 		return (T) resultValue;
@@ -625,8 +625,8 @@ private <T extends IRI & NativeValue> T data2uri(int id, byte[] data) throws IOE
 					&& (e instanceof Exception || e instanceof AssertionError)) {
 				return (T) new CorruptIRI(revision, id, namespace, data);
 			}
-			logger.error(
-					"Possible corrupt data consider setting the system property org.eclipse.rdf4j.sail.nativerdf.softFailOnCorruptDataAndRepairIndexes to true");
+			logger.warn(
+					"NativeStore is possibly corrupt. To attempt to repair or retrieve the data, read the documentation on http://rdf4j.org about the system property org.eclipse.rdf4j.sail.nativerdf.softFailOnCorruptDataAndRepairIndexes");
 			throw e;
 		}