classcastexception

Hello and thanks for watching ;-) Our problem/error is: javax.persistence.PersistenceException: [PersistenceUnit: PUname] Unable to build EntityManagerFactory ... Caused by: org.hibernate.HibernateException: Could not instantiate dialect class ... Caused by: java.lang.ClassCastException: org.hibernate.dialect.MySQLDialect cannot be cast to org.hibernate.dialect.Dialect ... (see full stack trace at the bottom) It occurs in a GWT based web application using the following technologies: Maven Hibernate EntityManager /JPA Guice GWT GWT-P GWT Maven Plugin ... The fact to stress is that it does work

So I'm playing with geotools and I thought I'd proxy one of their data-access classes and trace how it was being used in their code. I coded up a dynamic proxy and wrapped a FeatureSource (interface) in it and off it went happily. Then I wanted to look at some of the transitive objects returned by the featureSource as well, since the main thing a FeatureSource does is return a FeatureCollection (FeatureSource is analogous to a sql DataSource and featurecollection to an sql statement). in my invocationhandler I just passed the call through to the underlying object, printing out the target class

I have two different webapps, and each load the same class A with different classloader. When I put one instance in the session and then get it from the other webapp, a ClassCastException is thrown. For example, in webapp A, I store a in the session, then in webapp B, I get the a from the session and cast it to A, the ClassCastException is thrown. Is there a way to resolve this? Is there a way to resolve this? Basically no. As far as the JLS is concerned, the types are different types, and there is no way that the JVM will allow you to pretend otherwise. For instance, the classes could have

We are currently in the process of migrating an application from Java 7 to Java 8. After fixing a some compilation issues, I stumbled upon an issue similar to the following question: ClassCast Error: Java 7 vs Java 8 . To summarise, here is a sample code that shows the issue: public class Test { public static void main(String[] args) { System.out.println(String.valueOf(getVal("xxx"))); // 7: prints the result, 8: Exception } @SuppressWarnings("unchecked") public static <T> T getVal(String param) { // do some computation based on param... return (T) result; // actual return type only depends on

Please help me to convert ArrayList to String[]. The ArrayList contains values of type Object(VO). For example, The problem is that I need to convert a country List to String Array, sort it and then put it in a list. However I am getting a ClassCastException. String [] countriesArray = countryList.toArray(new String[countryList.size()]); I have assumed that your country List name is countryList . So to convert ArrayList of any class into array use following code. Convert T into the class whose arrays you want to create. List<T> list = new ArrayList<T>(); T [] countries = list.toArray(new T

I am trying to write an AlertDialog with 3 buttons. I want the middle, Neutral Button to be disabled if a certain condition is not met. Code int playerint = settings.getPlayerInt(); int monsterint = settings.getMonsterInt(); AlertDialog.Builder alertbox = new AlertDialog.Builder(this); alertbox.setMessage("You have Encountered a Monster"); alertbox.setPositiveButton("Fight!", new DialogInterface.OnClickListener() { // do something when the button is clicked public void onClick(DialogInterface arg0, int arg1) { createMonster(); fight(); } }); alertbox.setNeutralButton("Try to Outwit", new

This question already has an answer here: Casting to generic type in Java doesn't raise ClassCastException? 5 answers I have some code which looks something like this (part of a negative test of the method get ): import java.util.*; public class Test { Map<String, Object> map = new HashMap<>(); public static void main (String ... args) { Test test = new Test(); test.put("test", "value"); // Store a String System.out.println("Test: " + test.get("test", Double.class)); // Retrieve it as a Double } public <T> T get(String key, Class<T> clazz) { return (T) map.get(key); } public void put(String