title: Why documents4j run test with maven occurs error
body: <p>I using documents4j to convert docx to PDF, while run in IDEA, all is find, but when I run test with maven or jenkins, I got an error:</p>
  <pre><code>java.lang.IllegalStateException: Shutdown in progress
          at java.base/java.lang.ApplicationShutdownHooks.remove(ApplicationShutdownHooks.java:82) ~[na:na]
          at java.base/java.lang.Runtime.removeShutdownHook(Runtime.java:242) ~[na:na]
          at com.documents4j.job.ConverterAdapter.deregisterShutdownHook(ConverterAdapter.java:121) ~[documents4j-util-conversion-1.1.5.jar:na]
          at com.documents4j.job.ConverterAdapter.cleanUp(ConverterAdapter.java:107) ~[documents4j-util-conversion-1.1.5.jar:na]
          at com.documents4j.job.ConverterAdapter.shutDown(ConverterAdapter.java:98) ~[documents4j-util-conversion-1.1.5.jar:na]
          at com.documents4j.job.LocalConverter.shutDown(LocalConverter.java:109) ~[documents4j-local-1.1.5.jar:na]
          at com.documents4j.job.ConverterAdapter$ConverterShutdownHook.run(ConverterAdapter.java:134) ~[documents4j-util-conversion-1.1.5.jar:na]
  </code></pre>
  <p>My pom.xml like this:</p>
  <pre><code>        &lt;dependency&gt;
              &lt;groupId&gt;com.documents4j&lt;/groupId&gt;
              &lt;artifactId&gt;documents4j-local&lt;/artifactId&gt;
              &lt;version&gt;1.1.5&lt;/version&gt;
          &lt;/dependency&gt;
  
          &lt;dependency&gt;
              &lt;groupId&gt;com.documents4j&lt;/groupId&gt;
              &lt;artifactId&gt;documents4j-transformer-msoffice-word&lt;/artifactId&gt;
              &lt;version&gt;1.1.5&lt;/version&gt;
          &lt;/dependency&gt;
  </code></pre>