GP-3145 - Squash some known unfixable exceptions ecountered when using

the Help Window

Ghidra/Framework/Gui/src/main/java/ghidra/SwingExceptionHandler.java

@@ -4,9 +4,9 @@
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
- * 
+ *
  *      http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@@ -22,6 +22,7 @@ import java.rmi.ConnectException;
 import ghidra.util.Msg;
 import ghidra.util.SystemUtilities;
 import ghidra.util.exception.ClosedException;
+import utilities.util.reflection.ReflectionUtilities;
 
 /**
  * Class to handle exceptions caught within the Swing event dispatch thread.
@@ -52,15 +53,7 @@ public class SwingExceptionHandler implements UncaughtExceptionHandler {
 			t = t.getCause();
 		}
 
-		if (t instanceof ThreadDeath) {
+		if (shouldIgnore(t)) {
-			return;
-		}
-
-		if (t instanceof ConnectException) {
-			return;
-		}
-
-		if (t instanceof ClosedException) {
 			return;
 		}
 
@@ -81,6 +74,58 @@ public class SwingExceptionHandler implements UncaughtExceptionHandler {
 			t);
 	}
 
+	private static boolean shouldIgnore(Throwable t) {
+
+		if (t instanceof ThreadDeath) {
+			return true;
+		}
+
+		if (t instanceof ConnectException) {
+			return true;
+		}
+
+		if (t instanceof ClosedException) {
+			return true;
+		}
+
+		if (isKnownJavaHelpException(t)) {
+			return true;
+		}
+
+		return false;
+	}
+
+	private static boolean isKnownJavaHelpException(Throwable t) {
+
+		String stackString = ReflectionUtilities.stackTraceToString(t);
+		if (stackString.contains("com.sun.java.help.impl.JHelpPrintHandler$JHFrame.validate")) {
+			// This happens in the Java Help API when trying to print.  We do not have license to 
+			// change that code, so squash the exception here.   Printing still seems to work as 
+			// expected.
+			return true;
+		}
+
+		// 
+		// There is an exception(s) that happens if the user has shown the Help Window and then 
+		// switches themes.  This exception is harder to test for, since it has not stack elements
+		// specific to the help API.  Below are some (hopefully) help-specific stack elements that 
+		// we can use to filter out this exception(s).
+		// 
+		if (stackString.contains("javax.help.plaf.basic.BasicTOCNavigatorUI")) {
+			return true;
+		}
+
+		if (stackString.contains("javax.swing.text.html.BlockView") &&
+			stackString.contains("javax.swing.text.html.HTMLDocument.fireChangedUpdate")) {
+			// Log a message since this type of exception may happen outside of the help system.  It
+			// may help developers to see this in the console.
+			Msg.debug(SwingExceptionHandler.class, "Squashed an assumed help exception");
+			return true;
+		}
+
+		return false;
+	}
+
 	@Override
 	public void uncaughtException(Thread t, Throwable e) {
 		handleUncaughtException(e);