Question

I need to log all the request parameters in some situations for debug purposes…

I tried using ToStringBuilder.reflectionToString(request), but it still showed memory addresses

Is there any easy way to log request parameters in plain text so that I could do something

logger.info(ToStringBuilder.reflectionToString(request)); ?

I also tried logger.info(ToStringBuilder.reflectionToString(request.getParameterMap());

Answer 1

reflectionToString only uses reflection on the object given, to find the attributes to print. The attributes themselves are output using their toString() methods.
Neither the request nor the parameter map have the request parameters you are interested in as direct attributes, so reflectionToString fails for you.

I know of no OOTB way to deeply reflection-print an object, in JDK or commons-lang.

What does the simple call

logger.info(request.getParameterMap());

produce for you?

Ah, I see: The parameter values are String arrays, which only print their hashcode.

You might try a helper function like this (disclaimer: uncompiled and untested)

public static String getParameterToString(ServletRequest request){
  StringBuilder sb = new StringBuilder("{");
  for (Map.Entry<String, String[]> entry : request.getParameterMap().entrySet()){
    sb.append(entry.getKey()).append(":");
    sb.append(Arrays.toString(entry.getValue())).append(",");
  }
  if (sb.length() > 1)
    sb.setLength(sb.length() - 1);
  return sb.append("}").toString();
}