I'm using Roaster(version 2.19.4.Final) to generate Java source files, and call function 'hasSyntaxErrors' to verify whether the class is valid before output it.

Below is my code, which I implement the interface Comparable. However it returns false by calling function 'hasSyntaxErrors', although I don't add a 'compareTo' function.

Any idea how to do the validation?

//create an empty instance

final JavaClassSource javaClass = Roaster.create(JavaClassSource.class);

//set the package name, and Java class name

javaClass.setPackage("demo.JavaCodeGenerator.roaster").setName("PersonPojo");

//add interface, can be one or more       

javaClass.addInterface(Serializable.class);

javaClass.addInterface(Comparable.class);

if(javaClass.hasSyntaxErrors()){

    System.err.println("SyntaxError: "+javaClass.getSyntaxErrors());

}