exception-handling

first of all here is the message The changes to the database were committed successfully, but an error occurred while updating the object context. The ObjectContext might be in an inconsistent state. Inner exception message: A referential integrity constraint violation occurred: The property values that define the referential constraints are not consistent between principal and dependent objects in the relationship. the problem happens when i try to insert new data in the entityframework My entity model in the database i set the relation to cascade on delete and update. that is the only change

I am working on sample demo application for Exception Handling in Spring MVC.I am trying Exception Handling With @ControllerAdvice I followed steps as describe in this link. But when i run my application i get the following error org.springframework.web.util.NestedServletException: Request processing failed; nested exception is com.test.core.ApplicationException For more details following are the classes I am working on ApplicationException.java public class ApplicationException extends RuntimeException{ /** * */ private static final long serialVersionUID = -9061684361606685158L; private

I'm very new to java and the idea of try catch blocks to handle exceptions. This roughly what I'm ending up with, and there simply has to be a better way: try { JSONObject jsonObject = new JSONObject(jsonString); int aCount = jsonObject.getInt("acount"); String devTok = jsonObject.getString("dt"); String qURL = jsonObject.getString("qu"); try { DatastoreService datastore = DatastoreServiceFactory.getDatastoreService(); Key qKey = KeyFactory.createKey("qu", qURL); int dsACount = (Integer) datastore.get(qKey).getProperty(kLastKnownANumber); //..etc.. more try catch blocks needed } catch

In several previous projects (all pre-Spring 3.0), I had a single error handling jsp file (usually "message.jsp") that had a line similar to the following: <spring:message code="exceptions.${exception.class.name}" text="${exception.message}"/> This allowed me to map exceptions to this page and resolve certain localized error messages based on the exception type by defining a derivative of the SimpleMappingExceptionResolver: <bean id="exceptionMapping" class="mycode.ui.resolvers.MyExceptionResolver"> <property name="exceptionMappings"> <props> <prop key="java.lang.Exception">message</prop>

I am facing a really strange problem with Core Data. Let's describe it: Definitions Let's say I have two models, ModelA and ModelB . In the data model ModelA has a reference to ModelB as a one-to-many association, and consequently ModelB has a one-to-one association with ModelA . Update When the application launches (especially at first launch), or when the user asks, I have to create or update all the ModelB instances for each ModelA instance. ModelA instances are predetermined. For each ModelA instance I have about 200 instances of ModelB . I use a code like this: ModelB *model =

I have a ruby code like this: begin doc = Nokogiri::HTML(open(url).read.strip) rescue Exception => ex log.error "Error: #{ex}" end And I am getting log as: ERROR -- : Error: execution expired I want block re-execute until it success. How can I do it? I'll expand on my comment a little bit. You can use retry to go back to the begin : begin doc = Nokogiri::HTML(open(url).read.strip) rescue Exception => ex log.error "Error: #{ex}" retry end That will keep trying (and logging errors) until it works or you manually kill it. That's probably not what you want though as one little mistake will send

.NET Programming guidelines state that we should not catch general exceptions. I assume the following code is not very good because of the general exception type catch: private object CreateObject(string classname) { object obj = null; if (!string.IsNullOrEmpty(classname)) { try { System.Type oType = System.Type.GetTypeFromProgID(customClass); obj = System.Activator.CreateInstance(oType); } catch (Exception ex) { Log.Error("Unable to create instance for COM Object with class name " + classname + "\n" + ex.Message); } } return obj; } In the following code I catch particular exceptions but not