# Working with build paths

Setting up the proper Java build path is an important task when doing Java development. Without the correct Java build path, you cannot compile your code. In addition, you cannot search or look at the type hierarchies for Java elements.

Java builder
Build classpath

Viewing and editing a project's build path
Adding a JAR file to the build path
Adding a library folder to the build path
Adding source code as individual files
Assigning the default JRE for the workbench
Building a Java program
Building automatically
Building manually
Choosing a JRE for launching a project

Java Build path
Installed JREs preference page