重写AbstractProcessor 使用注解重写文件时报错
原因是createSourceFile时 会记录每次创建的文件名 并记录在Set<String> aggregateGeneratedSourceNames中
如果重复创建 会报错

JavacFiler filter = (JavacFiler) processingEnv.getFiler();
JavaFileObject f = filter.createSourceFile(className);

//调用流程
createSourceFile->createSourceOrClassFile->checkNameAndExistence


private void checkNameAndExistence(String var1, boolean var2) throws FilerException {
        this.checkName(var1, var2);
        if (this.aggregateGeneratedSourceNames.contains(var1) || this.aggregateGeneratedClassNames.contains(var1)) {
            if (this.lint) {
                this.log.warning("proc.type.recreate", new Object[]{var1});
            }

            throw new FilerException("Attempt to recreate a file for type " + var1);
        }
    }

解决:
将Filer强转为JavacFiler 调用close方法

public void close() {
    this.clearRoundState();
    this.fileObjectHistory.clear();
    this.openTypeNames.clear();
    this.aggregateGeneratedSourceNames.clear();
    this.aggregateGeneratedClassNames.clear();
}

看来AbstractProcessor.process会调用多次