More explicit error messages.

webapp/src/edu/cornell/mannlib/vitro/webapp/servlet/setup/UpdateUploadedFiles.java

@@ -2,6 +2,8 @@
 
 package edu.cornell.mannlib.vitro.webapp.servlet.setup;
 
+import static edu.cornell.mannlib.vitro.webapp.dao.jena.JenaBaseDao.JENA_ONT_MODEL_ATTRIBUTE_NAME;
+
 import java.io.File;
 
 import javax.servlet.ServletContext;
@@ -21,7 +23,8 @@ import edu.cornell.mannlib.vitro.webapp.filestorage.backend.FileStorageSetup;
 import edu.cornell.mannlib.vitro.webapp.filestorage.updater.FileStorageUpdater;
 
 /**
- * TODO
+ * Check that the conditions are met for updating uploaded files. If everything
+ * is in place, call the updater.
  */
 public class UpdateUploadedFiles implements ServletContextListener {
 	private static final Log log = LogFactory.getLog(UpdateUploadedFiles.class);
@@ -46,19 +49,40 @@ public class UpdateUploadedFiles implements ServletContextListener {
 			WebappDaoFactory wadf = (WebappDaoFactory) ctx
 					.getAttribute("webappDaoFactory");
 			if (wadf == null) {
-				throw new IllegalStateException("Webapp DAO Factory is null");
+				throw new IllegalStateException("Webapp DAO Factory is null. "
+						+ "The ServletContext does not contain an attribute "
+						+ "for '" + "webappDaoFactory" + "'. "
+						+ "Does the log contain a previous exception from "
+						+ "JenaDataSourceSetup? Have you looked in "
+						+ "localhost.log for such an exception? Is it "
+						+ "possible that web.xml is not set up to run "
+						+ "JenaDataSourceSetup before UpdateUploadedFiles?");
 			}
 
 			OntModel jenaOntModel = (OntModel) ctx
-					.getAttribute(JenaBaseDao.JENA_ONT_MODEL_ATTRIBUTE_NAME);
+					.getAttribute(JENA_ONT_MODEL_ATTRIBUTE_NAME);
 			if (jenaOntModel == null) {
-				throw new IllegalStateException("Ontology model is null");
+				throw new IllegalStateException("Ontology model is null. "
+						+ "The ServletContext does not contain an attribute "
+						+ "for '" + JENA_ONT_MODEL_ATTRIBUTE_NAME + "'. "
+						+ "Does the log contain a previous exception from "
+						+ "JenaDataSourceSetup? Have you looked in "
+						+ "localhost.log for such an exception? Is it "
+						+ "possible that web.xml is not set up to run "
+						+ "JenaDataSourceSetup before UpdateUploadedFiles?");
 			}
 
 			FileStorage fileStorage = (FileStorage) ctx
 					.getAttribute(FileStorageSetup.ATTRIBUTE_NAME);
 			if (fileStorage == null) {
-				throw new IllegalStateException("File storage system is null");
+				throw new IllegalStateException("File storage system is null. "
+						+ "The ServletContext does not contain an attribute "
+						+ "for '" + FileStorageSetup.ATTRIBUTE_NAME + "'. "
+						+ "Does the log contain a previous exception from "
+						+ "FileStorageSetup? Have you looked in "
+						+ "localhost.log for such an exception? Is it "
+						+ "possible that web.xml is not set up to run "
+						+ "FileStorageSetup before UpdateUploadedFiles?");
 			}
 
 			String uploadDirectoryName = ConfigurationProperties
@@ -73,7 +97,6 @@ public class UpdateUploadedFiles implements ServletContextListener {
 						+ "' does not exist.");
 			}
 
-			
 			FileStorageUpdater fsu = new FileStorageUpdater(wadf, jenaOntModel,
 					fileStorage, uploadDirectory);
 			fsu.update();