javassist compilation error no such class

Question

I'm writing a program using javassist to compile another Java class. The generated class use some objects like BigDecimal, List, ArrayList. So I import their packages:

ClassPool pool = ClassPool.getDefault();
pool.insertClassPath(classDir); //classDir is my program Directory
pool.importPackage("java.util.List");
pool.importPackage("java.math.BigDecimal");
pool.importPackage("java.util.ArrayList");

Then I make some objects using CtField.make() for each object. When I use javassist to compile, it throws error:

CannotCompileException: [source error] no such class: BigDecimal

List is working fine, however, BigDecimal or ArrayList aren't. Is there any clue for this problem? Thanks!

Answer 1

changing from new BigDecimal() by adding exact classPath as new java.math.BigDecimal() solves the problem!

Answer 2

As the name implies, ClassPool.importPackage() (JavaDoc) is for importing packages, not classes. Considering that, you should use:

ClassPool pool = ClassPool.getDefault();
pool.insertClassPath(classDir); //classDir is my program Directory
pool.importPackage("java.util");
pool.importPackage("java.math");

Note: starting from Javassist 3.14, it does support importing also fully-qualified-class-names. So with that version, your original code should also work.