The build classpath is the path which is searched during compilation of a Java project. This path is referred to as "Java Build Path" in the JDT UI.
Java builder
Java development tools (JDT)
Classpath variable
Adding a JAR file to the build
path
Adding a library folder to the build path
Building a Java program
Building automatically
Building manually
Viewing and editing a project's build path
Working with build paths
Classpath Variables preferences
Java Build Path properties