I am getting an error message 'No constructor with matching signature found.' when construct a Java object that has been added to javaclasspath

I have made a Java class like the following:

import java.util.List;

import gov.nih.nlm.nls.metamap.AcronymsAbbrevs;
import gov.nih.nlm.nls.metamap.ConceptPair;
import gov.nih.nlm.nls.metamap.Ev;
import gov.nih.nlm.nls.metamap.Mapping;
import gov.nih.nlm.nls.metamap.MetaMapApi;
import gov.nih.nlm.nls.metamap.MetaMapApiImpl;
import gov.nih.nlm.nls.metamap.Negation;
import gov.nih.nlm.nls.metamap.PCM;
import gov.nih.nlm.nls.metamap.Position;
import gov.nih.nlm.nls.metamap.Result;
import gov.nih.nlm.nls.metamap.Utterance;

public class MetaMapTest{
	
	public MetaMapTest() {
		System.out.println("Nothing");  
	}

	public MetaMapTest(String text) throws Exception{
	  String input = text; 
        MetaMapApi api = new MetaMapApiImpl();
        System.out.println("api instanciated");    
        List<Result> resultList = api.processCitationsFromString(input);            
        Result result = resultList.get(0);
        String machineOutput = result.getMachineOutput();
        List<Negation> negList = result.getNegations();
        if (negList.size() > 0) {
          System.out.println("Negations:");
          for (Negation e: negList) {
            System.out.println("type: " + e.getType());
            System.out.print("Trigger: " + e.getTrigger() + ": [");
            for (Position pos: e.getTriggerPositionList()) {
              System.out.print(pos  + ",");
            }
            System.out.println("]");
            System.out.print("ConceptPairs: [");
            for (ConceptPair pair: e.getConceptPairList()) {
              System.out.print(pair + ",");
            }
            System.out.println("]");
            System.out.print("ConceptPositionList: [");
            for (Position pos: e.getConceptPositionList()) {
              System.out.print(pos + ",");
            }
            System.out.println("]");
          }
        } else {
        	System.out.println(" None.");
        }
       
       List<AcronymsAbbrevs> aaList = result.getAcronymsAbbrevs();
       if (aaList.size() > 0) {
         System.out.println("Acronyms and Abbreviations:");
         for (AcronymsAbbrevs e: aaList) {
           System.out.println("Acronym: " + e.getAcronym());
           System.out.println("Expansion: " + e.getExpansion());
           System.out.println("Count list: " + e.getCountList());
           System.out.println("CUI list: " + e.getCUIList());
         }
       } else {
         System.out.println(" None.");
       }
        
       for(Utterance utterance : result .getUtteranceList()) {
              System.out.println("Utterance:");
              System.out.println("  Id: "+ utterance.getId());
              System.out.println("  Utterance text: "+ utterance.getString());
              System.out.println("  Position: "+ utterance.getPosition());
                for(PCM pcm : utterance .getPCMList()) {
                      System.out.println("Mappings:");
                      for(Mapping map : pcm .getMappingList()) {
                            System.out.println("Phrase:");
                            System.out.println("  Map Score: "+ map.getScore());
                            for(Ev mapEv : map .getEvList()) {
                              System.out.println("  Score: "+ mapEv.getScore());
                              System.out.println("  Concept Id: "+ mapEv.getConceptId());
                              System.out.println("  Concept Name: "+ mapEv.getConceptName());
                              System.out.println("  Preferred Name: "+ mapEv.getPreferredName());
                              System.out.println("  Matched Words: "+ mapEv.getMatchedWords());
                              System.out.println("  Semantic Types: "+ mapEv.getSemanticTypes());
                              System.out.println("  MatchMap: "+ mapEv.getMatchMap());
                              System.out.println("  MatchMap alt. repr.: "+ mapEv.getMatchMapList());
                              System.out.println("  is Head?: "+ mapEv.isHead());
                              System.out.println("  is Overmatch?: "+ mapEv.isOvermatch());
                              System.out.println("  Sources: "+ mapEv.getSources());
                              System.out.println("  Positional Info: "+ mapEv.getPositionalInfo());
                                }
                    }
                      
                      System.out.println("Candidates:");
                      for (Ev ev: pcm.getCandidateList()) {
                        System.out.println(" Candidate:");
                        System.out.println("  Score: " + ev.getScore());
                        System.out.println("  Concept Id: " + ev.getConceptId());
                        System.out.println("  Concept Name: " + ev.getConceptName());
                        System.out.println("  Preferred Name: " + ev.getPreferredName());
                        System.out.println("  Matched Words: " + ev.getMatchedWords());
                        System.out.println("  Semantic Types: " + ev.getSemanticTypes());
                        System.out.println("  MatchMap: " + ev.getMatchMap());
                        System.out.println("  MatchMap alt. repr.: " + ev.getMatchMapList());
                        System.out.println("  is Head?: " + ev.isHead());
                        System.out.println("  is Overmatch?: " + ev.isOvermatch());
                        System.out.println("  Sources: " + ev.getSources());
                        System.out.println("  Positional Info: " + ev.getPositionalInfo());
                      }
              }
        }
  }	
	
}

And then I tried to call this function in Matlab like this:

o=MetaMapTest;

But I always get the message: 'No constructor 'MetaMapTest' with matching signature found.'

I thought I had already made the constructor, I don't understand why this is happening.

Thank you