diff --git a/config/findbugs-exclude.xml b/config/findbugs-exclude.xml
index 70b6047c0..02fcb54dc 100644
--- a/config/findbugs-exclude.xml
+++ b/config/findbugs-exclude.xml
@@ -82,10 +82,6 @@
       <Class name="com.puppycrawl.tools.checkstyle.api.TokenTypes" />
       <Bug pattern="DM_EXIT" />
     </Match>
-    <Match>
-      <!-- till #925 -->
-      <Package name="~com\.puppycrawl\.tools\.checkstyle\.gui.*" />
-    </Match>
     <Match>
       <!-- have never been a case for years, Eclipse does not show any other classes inherited from CommonASTWithHiddenTokens -->
       <Class name="com.puppycrawl.tools.checkstyle.api.DetailAST" />
diff --git a/src/main/java/com/puppycrawl/tools/checkstyle/gui/Main.java b/src/main/java/com/puppycrawl/tools/checkstyle/gui/Main.java
index 7205c56c7..405140b37 100644
--- a/src/main/java/com/puppycrawl/tools/checkstyle/gui/Main.java
+++ b/src/main/java/com/puppycrawl/tools/checkstyle/gui/Main.java
@@ -19,6 +19,7 @@
 
 package com.puppycrawl.tools.checkstyle.gui;
 
+import java.awt.*;
 import java.io.File;
 
 import javax.swing.JFrame;
@@ -47,9 +48,10 @@ public class Main
             final File f = new File(args[0]);
             panel.openFile(f, frame);
         }
-        frame.pack();
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
-        frame.setVisible(true);
+
+        Runnable runner = new FrameShower(frame);
+        EventQueue.invokeLater(runner);
     }
 
     /**
@@ -66,4 +68,32 @@ public class Main
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         frame.setVisible(true);
     }
+
+    /**
+     * http://findbugs.sourceforge.net/bugDescriptions.html#SW_SWING_METHODS_INVOKED_IN_SWING_THREAD
+     */
+    private static class FrameShower implements Runnable
+    {
+        /**
+         * frame
+         */
+        final JFrame frame;
+
+        /**
+         * contstructor
+         */
+        public FrameShower(JFrame frame)
+        {
+            this.frame = frame;
+        }
+
+        /**
+         * display a frame
+         */
+        public void run()
+        {
+            frame.pack();
+            frame.setVisible(true);
+        }
+    }
 }
diff --git a/src/main/java/com/puppycrawl/tools/checkstyle/gui/ParseTreeInfoPanel.java b/src/main/java/com/puppycrawl/tools/checkstyle/gui/ParseTreeInfoPanel.java
index f31dd860a..7f2ca2f1e 100644
--- a/src/main/java/com/puppycrawl/tools/checkstyle/gui/ParseTreeInfoPanel.java
+++ b/src/main/java/com/puppycrawl/tools/checkstyle/gui/ParseTreeInfoPanel.java
@@ -30,15 +30,7 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.TooManyListenersException;
 
-import javax.swing.AbstractAction;
-import javax.swing.Action;
-import javax.swing.JButton;
-import javax.swing.JFileChooser;
-import javax.swing.JOptionPane;
-import javax.swing.JPanel;
-import javax.swing.JScrollPane;
-import javax.swing.JTextArea;
-import javax.swing.SwingUtilities;
+import javax.swing.*;
 import javax.swing.filechooser.FileFilter;
 
 import antlr.ANTLRException;
@@ -59,7 +51,8 @@ public class ParseTreeInfoPanel extends JPanel
 {
     /** For Serialisation that will never happen. */
     private static final long serialVersionUID = -4243405131202059043L;
-    private final ParseTreeModel parseTreeModel;
+
+    private final transient ParseTreeModel parseTreeModel;
     private final JTextArea jTextArea;
     private File lastDirectory;
     private File currentFile;
@@ -270,8 +263,7 @@ public class ParseTreeInfoPanel extends JPanel
     {
         setLayout(new BorderLayout());
 
-        final DetailAST treeRoot = null;
-        parseTreeModel = new ParseTreeModel(treeRoot);
+        parseTreeModel = new ParseTreeModel(null);
         JTreeTable treeTable = new JTreeTable(parseTreeModel);
         final JScrollPane sp = new JScrollPane(treeTable);
         this.add(sp, BorderLayout.NORTH);
@@ -308,14 +300,7 @@ public class ParseTreeInfoPanel extends JPanel
 
     private void showErrorDialog(final Component parent, final String msg)
     {
-        final Runnable showError = new Runnable()
-        {
-            @Override
-            public void run()
-            {
-                JOptionPane.showMessageDialog(parent, msg);
-            }
-        };
+        final Runnable showError = new FrameShower(parent, msg);
         SwingUtilities.invokeLater(showError);
     }
 
@@ -323,5 +308,38 @@ public class ParseTreeInfoPanel extends JPanel
     {
       return lines2position;
     }
+
+    /**
+     * http://findbugs.sourceforge.net/bugDescriptions.html#SW_SWING_METHODS_INVOKED_IN_SWING_THREAD
+     */
+    private static class FrameShower implements Runnable
+    {
+        /**
+         * frame
+         */
+        final Component parent;
+
+        /**
+         * frame
+         */
+        final String msg;
+
+        /**
+         * contstructor
+         */
+        public FrameShower(Component parent, final String msg)
+        {
+            this.parent = parent;
+            this.msg = msg;
+        }
+
+        /**
+         * display a frame
+         */
+        public void run()
+        {
+            JOptionPane.showMessageDialog(parent, msg);
+        }
+    }
 }
 
diff --git a/src/main/java/com/puppycrawl/tools/checkstyle/gui/TreeTableModelAdapter.java b/src/main/java/com/puppycrawl/tools/checkstyle/gui/TreeTableModelAdapter.java
index e0f665166..398281d01 100644
--- a/src/main/java/com/puppycrawl/tools/checkstyle/gui/TreeTableModelAdapter.java
+++ b/src/main/java/com/puppycrawl/tools/checkstyle/gui/TreeTableModelAdapter.java
@@ -84,8 +84,9 @@ public class TreeTableModelAdapter extends AbstractTableModel
 {
     /** For Serialisation that will never happen. */
     private static final long serialVersionUID = 8269213416115369275L;
+
     private final JTree tree;
-    private final TreeTableModel treeTableModel;
+    private final transient TreeTableModel treeTableModel;
 
     public TreeTableModelAdapter(TreeTableModel treeTableModel, JTree tree)
     {