Seeing difference when run jmx from Java application and GUI mode - jmeter

Question

My Java pom.xml has these dependencies:
<dependency>
<groupId>org.apache.jmeter</groupId>
<artifactId>ApacheJMeter_core</artifactId>
<version>5.0</version>
</dependency>
and in my jmx file -> jsr223 assertion I have this simple function:
log.info(prev.getResponseDataAsString())
When I run from GUI mode I am able to see the complete response logged in the console, but when my Java application executes the same jmx, I got:
2018/10/25 20:50:53,576 12050 [INFO ] [Thread Group 1-1] (?:?) –
${__FileToString(${inputFilePath},,)}
Is this because I miss some dependencies in my pom.xml? Since it always return
${__FileToString(${inputFilePath},,)}
instead of the actual response which cause I am not able to continue the rest of the test. Rest of stuff all depends on this result. This function comes from the body data of the HTTP Request sampler!!!!!! If I give actual body there then I am able to run the jmx...... Any idea how to deal with this dynamic body data?
UPDATE 1
I found the solution! Instead directly use the ${__FileToString(${inputFilePath},,)} in the body data of HTTP Request Sampler, I can just create one more JSR223 Sampler above the HTTP Request Sampler and in this sampler, I can just do:
import org.apache.commons.io.FileUtils
log.info("--------------------------------------- "+ '${inputFilePath}')
String content = FileUtils.readFileToString(new File('${inputFilePath}'))
vars.put("reqBody", content)
and in the body data of HTTP Request Sampler, I will do ${reqBody}. That's it!

Answer 1

You were missing dependency :
<dependency>
<groupId>org.apache.jmeter</groupId>
<artifactId>ApacheJMeter_functions</artifactId>
<version>5.0</version>
</dependency>