How to use java program in bean pre-processor

Question

The below program reads the XML file and compress into gzip.

I have a couple of questions here.

1. Can I use the following program directly in JMeter BeanS

Answer 1

GZIP compression is rather "heavy" operation, if you will have lots of virtual users - it may become a bottleneck so consider using other approaches:

1. There is __base64Encode() function available via JMeter plugins
2. If for any reason it is not enough - go for JSR223 Sampler and Groovy language, Groovy is mostly compatible with Java so your code should work fine (just remove main method)