Fixes for Error handling

components/application-mgt/org.wso2.carbon.device.application.mgt.api/src/main/java/org/wso2/carbon/device/application/mgt/api/services/impl/ApplicationManagementServiceImpl.java

@@ -18,8 +18,12 @@
  */
 package org.wso2.carbon.device.application.mgt.api.services.impl;
 
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.wso2.carbon.device.application.mgt.api.beans.ErrorResponse;
 import org.wso2.carbon.device.application.mgt.api.services.ApplicationManagementService;
 import org.wso2.carbon.device.application.mgt.core.components.ApplicationManager;
+import org.wso2.carbon.device.application.mgt.core.exception.ApplicationManagerException;
 import org.wso2.carbon.device.application.mgt.core.util.ApplicationManagementUtil;
 
 import javax.ws.rs.POST;
@@ -27,6 +31,8 @@ import javax.ws.rs.core.Response;
 
 public class ApplicationManagementServiceImpl implements ApplicationManagementService {
 
+    private static Log log = LogFactory.getLog(ApplicationManagementServiceImpl.class);
+
     @POST
     @Override
     public Response createApplication(String ifModifiedSince, String name) {
@@ -37,6 +43,13 @@ public class ApplicationManagementServiceImpl implements ApplicationManagementSe
     @Override
     public Response getApplications(String ifModifiedSince) {
         ApplicationManager applicationManager = ApplicationManagementUtil.getApplicationManager();
-        return Response.ok().entity(applicationManager.getApplications().get(0).getName()).build();
+        try {
+            return Response.ok().entity(applicationManager.getApplications()).build();
+        } catch (ApplicationManagerException e) {
+            String msg = "Error occured while getting the application list";
+            log.error(msg, e);
+            return Response.serverError().entity(
+                    new ErrorResponse.ErrorResponseBuilder().setMessage(msg).build()).build();
+        }
     }
 }

components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/components/ApplicationManager.java

@@ -19,14 +19,15 @@
 package org.wso2.carbon.device.application.mgt.core.components;
 
 import org.wso2.carbon.device.application.mgt.core.dto.Application;
+import org.wso2.carbon.device.application.mgt.core.exception.ApplicationManagerException;
 
 import java.util.ArrayList;
 import java.util.List;
 
 public interface ApplicationManager {
 
-    public void createApplication(Application application);
+    public void createApplication(Application application) throws ApplicationManagerException;
 
-    public List<Application> getApplications();
+    public List<Application> getApplications() throws ApplicationManagerException;
 
 }

components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/components/impl/ApplicationManagerImpl.java

@@ -25,6 +25,7 @@ import org.wso2.carbon.device.application.mgt.core.dao.ApplicationManagementDAO;
 import org.wso2.carbon.device.application.mgt.core.dao.ApplicationManagementDAOException;
 import org.wso2.carbon.device.application.mgt.core.dao.ApplicationManagementDAOImpl;
 import org.wso2.carbon.device.application.mgt.core.dto.Application;
+import org.wso2.carbon.device.application.mgt.core.exception.ApplicationManagerException;
 import org.wso2.carbon.device.application.mgt.core.internal.ApplicationManagementDataHolder;
 import org.wso2.carbon.device.application.mgt.core.util.ConnectionManagerUtil;
 
@@ -39,11 +40,11 @@ public class ApplicationManagerImpl implements ApplicationManager {
 
     private static ApplicationManagerImpl applicationManager = new ApplicationManagerImpl();
 
-    private ApplicationManagerImpl(){
+    private ApplicationManagerImpl() {
 
     }
 
-    public static ApplicationManagerImpl getInstance(){
+    public static ApplicationManagerImpl getInstance() {
         return applicationManager;
     }
 
@@ -54,21 +55,11 @@ public class ApplicationManagerImpl implements ApplicationManager {
     }
 
     @Override
-    public List<Application> getApplications() {
+    public List<Application> getApplications() throws ApplicationManagerException {
-        ApplicationManagementDataHolder dataHolder = ApplicationManagementDataHolder.getInstance();
-        try {
         ConnectionManagerUtil.openConnection();
-        } catch (SQLException e) {
+        ApplicationManagementDAO applicationManagementDAO = ApplicationManagementDataHolder.getInstance().getApplicationManagementDAO();
-            e.printStackTrace();
-        }
-        ApplicationManagementDAO applicationManagementDAO = dataHolder.getApplicationManagementDAO();
         List<Application> applications = null;
-        try {
         applications = applicationManagementDAO.getApplications();
-        } catch (ApplicationManagementDAOException e) {
-            log.error(e);
-        }
-
         ConnectionManagerUtil.closeConnection();
         return applications;
     }

components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/config/ApplicationConfigurationManager.java

@@ -70,7 +70,7 @@ public class ApplicationConfigurationManager {
             Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
             this.applicationManagerConfiguration = (ApplicationManagementConfigurations) unmarshaller.unmarshal(doc);
         } catch (Exception e) {
-            throw new ApplicationManagerException("Error occurred while initializing application config");
+            throw new ApplicationManagerException("Error occurred while initializing application config", e);
         }
     }
 

components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/dao/ApplicationManagementDAOException.java

@@ -18,25 +18,11 @@
  */
 package org.wso2.carbon.device.application.mgt.core.dao;
 
-public class ApplicationManagementDAOException extends Exception {
+import org.wso2.carbon.device.application.mgt.core.exception.ApplicationManagerException;
 
-    String message;
+public class ApplicationManagementDAOException extends ApplicationManagerException {
 
-    public ApplicationManagementDAOException(String message){
+    public ApplicationManagementDAOException(String message, Throwable throwable) {
-        this.message = message;
+        super(message, throwable);
-    }
-
-    @Override
-    public String getMessage() {
-        return message;
-    }
-
-    public void setMessage(String message) {
-        this.message = message;
-    }
-
-    @Override
-    public String toString() {
-        return super.toString();
     }
 }

components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/dao/ApplicationManagementDAOImpl.java

@@ -81,7 +81,7 @@ public class ApplicationManagementDAOImpl implements ApplicationManagementDAO {
             }
 
         } catch (SQLException e) {
-            throw new ApplicationManagementDAOException("Error occurred while getting application List");
+            throw new ApplicationManagementDAOException("Error occurred while getting application List", e);
         } finally {
             ApplicationManagementDAOUtil.cleanupResources(stmt, rs);
         }

components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/exception/ApplicationManagerException.java

@@ -22,8 +22,9 @@ public class ApplicationManagerException extends Exception {
 
     String message;
 
-    public ApplicationManagerException(String message){
+    public ApplicationManagerException(String message, Throwable throwable){
-        this.message = message;
+        super(message, throwable);
+        setMessage(message);
     }
 
     @Override
@@ -34,9 +35,4 @@ public class ApplicationManagerException extends Exception {
     public void setMessage(String message) {
         this.message = message;
     }
-
-    @Override
-    public String toString() {
-        return super.toString();
-    }
 }

components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/util/ApplicationManagementUtil.java

@@ -56,7 +56,7 @@ public class ApplicationManagementUtil {
             return docBuilder.parse(file);
         } catch (Exception e) {
             throw new ApplicationManagerException("Error occurred while parsing file, while converting " +
-                    "to a org.w3c.dom.Document : " + e.getMessage());
+                    "to a org.w3c.dom.Document : ", e);
         }
     }
 }

components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/util/ConnectionManagerUtil.java

@@ -22,8 +22,8 @@ import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.wso2.carbon.device.application.mgt.core.config.datasource.DataSourceConfig;
 import org.wso2.carbon.device.application.mgt.core.config.datasource.JNDILookupDefinition;
+import org.wso2.carbon.device.application.mgt.core.exception.ApplicationManagerException;
 import org.wso2.carbon.device.application.mgt.core.exception.IllegalTransactionStateException;
-import org.wso2.carbon.device.application.mgt.core.exception.TransactionManagementException;
 
 import javax.naming.InitialContext;
 import javax.sql.DataSource;
@@ -52,7 +52,7 @@ public class ConnectionManagerUtil {
         return currentConnection;
     }
 
-    public static void openConnection() throws SQLException {
+    public static void openConnection() throws ApplicationManagerException {
         Connection conn = currentConnection.get();
         if (conn != null) {
             throw new IllegalTransactionStateException("A transaction is already active within the context of " +
@@ -63,14 +63,14 @@ public class ConnectionManagerUtil {
             conn = dataSource.getConnection();
         } catch (SQLException e) {
             currentTxState.set(TxState.CONNECTION_NOT_BORROWED);
-            throw e;
+            throw new ApplicationManagerException(e.getMessage(), e);
         }
         currentConnection.set(conn);
         currentTxState.set(TxState.CONNECTION_BORROWED);
     }
 
 
-    public static void beginTransaction() throws TransactionManagementException {
+    public static void beginTransaction() throws ApplicationManagerException {
         Connection conn = currentConnection.get();
         if (conn != null) {
             throw new IllegalTransactionStateException("A transaction is already active within the context of " +
@@ -80,7 +80,7 @@ public class ConnectionManagerUtil {
         try {
             conn = dataSource.getConnection();
         } catch (SQLException e) {
-            throw new TransactionManagementException("Error occurred while retrieving a data source connection", e);
+            throw new ApplicationManagerException("Error occurred while retrieving a data source connection", e);
         }
 
         try {
@@ -93,7 +93,7 @@ public class ConnectionManagerUtil {
                         "Transaction has ended pre-maturely", e1);
             }
             currentTxState.set(TxState.CONNECTION_CLOSED);
-            throw new TransactionManagementException("Error occurred while setting auto-commit to false", e);
+            throw new ApplicationManagerException("Error occurred while setting auto-commit to false", e);
         }
         currentConnection.set(conn);
         currentTxState.set(TxState.CONNECTION_BORROWED);