对于感兴趣的人，我是这样解决的：
不要创建任何文件（pig.properties或.pigbootup），这将为您创建它们。

//Create properties file and register our jars
String pigProps = "src/test/resources/pig.properties";
String bootupPath = "src/test/resources/.pigbootup";
File propertyFile = new File(pigProps);
PrintWriter out = new PrintWriter(new FileWriter(propertyFile));
out.println("pig.load.default.statements=" + bootupPath);
out.close();

File bootupFile = new File(bootupPath);
out = new PrintWriter(new FileWriter(bootupFile));
out.println("REGISTER 'src/test/resources/Custom.jar';");
out.println("REGISTER 'src/test/resources/datafu.jar';");
out.println("REGISTER 'src/test/resources/piggybank.jar';");
out.close();