Group items tagged

Exception Handling

5. Exception Handling

Organizing exceptions in an exception(s) package is problematic

The only use for getSingleResult() is when we are

query wich will

Mapping enum to database column using JPA/Hibernate You can use any of the 3 approaches discussed above. Map the enum to an integer column. The persistence implementation should automatically convert enum to ordinal() and back for you. Map the enum to a String column. The persistence implementation should automatically convert the enum value to String value via the name() function. Map the enum using a business value. You should mark the enum field as @Transient, and create another String field which you can map to a String column in your database table. Here’s an example code snippet. view plaincopy to clipboardprint?@Entity  public class Product {   @Column   private String colorValue;     @Transient   public Color getColor() {    return Color.fromValue(colorValue);   }     public void setColor(Color color) {    this.colorValue = color.toValue();   }  }  

Approach 3: Using a user defined business value – Recommended approach! This approach involves assigning a an explicit user defined value to each enum constant and defining a toValue() and fromValue() methods on the enum to do the serialization and deserialization.

public enum Color {   RED("RED"), GREEN("GREEN"), BLUE("BLUE"), UNKNOWN("UNKNOWN");     private final String value;     Color(String value) {     this.value = value;   }     public static Color fromValue(String value) {     if (value != null) {       for (Color color : values()) {         if (color.value.equals(value)) {           return color;         }       }     }       // you may return a default value     return getDefault();     // or throw an exception     // throw new IllegalArgumentException("Invalid color: " + value);   }     public String toValue() {     return value;   }     public static Color getDefault() {     return UNKNOWN;   }  }  public enum Color { RED("RED"), GREEN("GREEN"), BLUE("BLUE"), UNKNOWN("UNKNOWN"); private final String value; Color(String value) { this.value = value; } public static Color fromValue(String value) { if (value != null) { for (Color color : values()) { if (color.value.equals(value)) { return color; } } } // you may return a default value return getDefault(); // or throw an exception // throw new IllegalArgumentException("Invalid color: " + value); } public String toValue() { return value; } public static Color getDefault() { return UNKNOWN; } } This approach is better than approach 1 and approach 2 above. It neither depends on the order in which the enum constants are declared nor on the constant names.

15.6. Authorization

Seam Security is built around the premise of users being granted roles and/or permissions, allowing them to perform operations that may not otherwise be permissible for users without the necessary security privileges

15.6.1. Core concepts

regarding the issue of selling Weld and EE6 to developers/shops....

How bout a JdbcTemplate Spring equivalent in the case of projects using legacy db schemas

portable extension to Weld

Known Limitations

Gas3 does not support inner classes

A proper way for JPA entities instantiation

creating the entities I would like to focus in this post

JPA2.0 entities

GDS will neither convert AS3 String to Java numeric types or boolean, nor AS3 numeric types or boolean to String

Win7 64 Graphics driver update 15.17.16.2302 for Cantiga M09 (except AMG) and E3 KrugMV 14/15

Windows 7 64-bit

Latitude E6500

Transactional Interceptors

add an annotation

standardized values

queries are also known as native queries

SQL Queries

reasons why a developer using JP QL might want to integrate SQL queries into their application

Arquillian recognizes three container interaction styles: A remote container resides in a separate JVM from the test runner. Arquillian binds to the container to deploy the test archive and invokes tests via a remote protocol (e.g., Servlet, JMX). A managed container is similar to a remote container, except its lifecycle (startup/shutdown) is also managed by Arquillian. An embedded container resides in the same JVM and is mostly likely managed by Arquillian. Tests are executed via a local protocol for containers without a web component and via a remote protocol for containers with a web component. No need to fiddle with those Maven plugins!

Arquillian can control a variety of containers out of the box

Connection

If you need to determine if the connection is still valid, issue a simple query, such as SELECT 1. The driver will throw an exception if the connection is no longer valid.

GraniteDS – deserialize ActionScript object to a Java Map object

key of type String and a value of type List