# Migrating to QDox 2.0

### Farewell JavaDocBuilder, hello JavaProjectBuilder

### Farewell OrderedMap, hello LinkedHashMap

Before JDK1.3 there was no implementation available which could hold the order in which entries were added to a Map. With JDK1.4 the LinkedHashMap was introduced. We've decided to make use of this class which also means projects using QDox need at least JDK1.4. If you want QDox to parse code with an older JDK version, you'll have to configure the ClassLoaderLibrary feeding it with the required classloaders.

### Farewell JavaClass, hello JavaClass

Looks like nothing has changed, but we've decided to change all models to interfaces and give them a default implementation. This way we can hide all methods which the ModelBuilder needs to build the model and you'll only see those methods which are interesting for you. This also means that the default implementations looks much more like plain old Java Objects, its binding logic has been moved to the ModelBuilder.

### Farewell AbstractQDoxTask for Ant

We've decided to remove this Abstract AntTask. It doesn't belong in the core of QDox, but it's an prepared Ant Task to use QDox. Although we'd defined this dependency as optional, it kind of spoiled the pom.xml.

### Farewell APITestCase for JUnit3

## Summary

- Use the JavaProjectBuilder instead of the JavaDocBuilder
- QDox requires at least JDK1.4