title: java.io.IOException: Short read of DER length
body: <p>I'm trying to create a Java application that can read x509 certificates informations and display them in a <code>TableView</code>.</p>
  
  <p>But i've a problem when i'm trying to display those informations with the code below</p>
  
  <pre><code>@FXML
  private void handleHDD() throws CertificateException, IOException{
      String userDir = System.getProperty("user.home");
      File folder = new File(userDir +"\\Desktop\\Certificate_Folder");
      File[] certificates = folder.listFiles();
      if (certificates!=null){
  
          String columnHeader[] = {"Nom","Version","N°série","Algorithme de signature","Emetteur","Valide à partir de","Valide jusqu'au","Objet","Clé publique"};
  
          int sizeColumns = 9;
  
          for (File file : certificates){
              if(file.isFile()){
              CertificateFactory cf = CertificateFactory.getInstance("X.509");
              InputStream input = new FileInputStream(file);
  
              X509Certificate cert = (X509Certificate) cf.generateCertificate(input);
              input.close();
              for (int j = 0; j &lt; sizeColumns; j++) {
                  data.add(new CertificateModel(file.getName().replace(".der", ""),cert.getVersion(),cert.getSerialNumber().toString(),cert.getSigAlgName(),cert.getIssuerDN().toString(),cert.getNotBefore(),cert.getNotAfter(),cert.getSubjectDN().toString(),cert.getPublicKey().toString()));
                  TableColumn col = new TableColumn();
                  col.setText(columnHeader[j]);
                  col.setMinWidth(200);
                  col.setCellValueFactory(new PropertyValueFactory&lt;CertificateModel, String&gt;(columnHeader[j]));
                  table.getColumns().addAll(col);
              }               
              table.setItems(data);
  
              }
  
  
              }
  
          }
      }
  </code></pre>
  
  <p>When i try to execute it, i hav the following exception: <code>java.security.cert.CertificateException</code></p>
  
  <hr>
  
  <p>This is the full exception stack:</p>
  
  <pre><code>Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
  at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1774)
  at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
  at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
  at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
  at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
  at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
  at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
  at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
  at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
  at javafx.event.Event.fireEvent(Event.java:198)
  at javafx.scene.Scene$ClickGenerator.postProcess(Scene.java:3470)
  at javafx.scene.Scene$ClickGenerator.access$8100(Scene.java:3398)
  at javafx.scene.Scene$MouseHandler.process(Scene.java:3766)
  at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
  at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
  at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
  at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:381)
  at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
  at java.security.AccessController.doPrivileged(Native Method)
  at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:417)
  at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
  at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:416)
  at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
  at com.sun.glass.ui.View.notifyMouse(View.java:937)
  at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
  at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
  at java.lang.Thread.run(Thread.java:748)
  Caused by: java.lang.reflect.InvocationTargetException
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:498)
      at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
      at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:498)
      at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
      at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1771)
      ... 33 more
  Caused by: java.security.cert.CertificateException: Unable to initialize, java.io.IOException: Short read of DER length
      at sun.security.x509.X509CertImpl.&lt;init&gt;(X509CertImpl.java:198)
      at sun.security.provider.X509Factory.engineGenerateCertificate(X509Factory.java:102)
      at java.security.cert.CertificateFactory.generateCertificate(CertificateFactory.java:339)
      at cm.camgovca.view.CertificateOverviewController.handleHDD(CertificateOverviewController.java:98)
      ... 43 more
  Caused by: java.io.IOException: Short read of DER length
      at sun.security.util.DerInputStream.getLength(DerInputStream.java:582)
      at sun.security.util.DerValue.&lt;init&gt;(DerValue.java:252)
      at sun.security.util.DerInputStream.getDerValue(DerInputStream.java:451)
      at sun.security.x509.X509CertImpl.parse(X509CertImpl.java:1784)
      at sun.security.x509.X509CertImpl.&lt;init&gt;(X509CertImpl.java:195)
      ... 46 more
  </code></pre>
  
  <p>The line 98 of CertificateOverview.java is</p>
  
  <pre><code>X509Certificate cert = (X509Certificate) cf.generateCertificate(input);
  </code></pre>
  
  <p>And my certificate is DER Encoded (.der)</p>