title: Identifying an error of java.lang.AbstractMethodError in a java program
body: <p>When I run a Java program, I get an error:</p>
  <blockquote>
  <p>Exception in thread &quot;Thread-18&quot;</p>
  <p>Exception: java.lang.AbstractMethodError thrown from the UncaughtExceptionHandler in thread &quot;Thread-18&quot;.</p>
  </blockquote>
  <p>However, it does not indicate which line makes this mistake. The program has 20000 thousands of codes, I cannot check each line.</p>