title: Apache POI error loading XSSFWorkbook class
body: <p>I'm trying to write a program that works with Excel docs, but the HSSF format is too small for my requirements. I'm attempting to move to XSSF, but I keep getting errors when trying to use it.</p>
  
  <p>I managed to solve the first two by adding xmlbeans-2.3.0.jar and dom4j-1.6.jar to my program, but now this error is coming up, which doesn't seem to be resolved by adding the Apache commons jar available on the Apache website.</p>
  
  <p>The error is as follows:</p>
  
  <pre><code>Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/collections4/ListValuedMap
      at hot.memes.ExcelCreator.main(ExcelCreator.java:66)
  Caused by: java.lang.ClassNotFoundException: org.apache.commons.collections4.ListValuedMap
      at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
      at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
      ... 1 more
  </code></pre>