Yikes! java.lang.reflect.InvocationTargetException

package com.example;
import java.util.ArrayList;
import java.io.Serializable;
import java.util.Date;
import java.util.List; 
import java.util.Arrays; 

public class BlogPost implements Comparable<BlogPost>, Serializable {
  private String mAuthor;
  private String mTitle;
  private String mBody;
  private String mCategory;
  private Date mCreationDate; 
  public String word;

  public BlogPost(String author, String title, String body, String category, Date creationDate) {
    mAuthor = author;
    mTitle = title;
    mBody = body;
    mCategory = category;
    mCreationDate = creationDate;
  }

  public int compareTo(BlogPost other) {
    if (equals(other)) {
      return 0;
    }
    return mCreationDate.compareTo(other.mCreationDate);
  }

    public List<String> getWords() {
    String[] links = mBody.toLowerCase().split("\\s+");
    return Arrays.asList(links);

  }

    public List<String> getExternalLinks() {
      return getWordsPrefixedWith("http");
  }

  public List<String> getWordsPrefixedWith(String prefix) {
    List<String> results = new ArrayList<String>();
    for (String word : getWords()) {  
    }
      if (word.startsWith(prefix)) {
        results.add(word);
      } 
      return results; } 

  public String getAuthor() {
    return mAuthor;
  }

  public String getTitle() {
    return mTitle;
  }

  public String getBody() {
    return mBody;
  }

  public String getCategory() {
    return mCategory;
  }

  public Date getCreationDate() {
    return mCreationDate;
  }
}