fix: Super-source Exceptions#getStackTraceAsString on GWT.

core/src/main/java/de/damios/guacamole/Exceptions.java

@@ -41,7 +41,7 @@ public static void throwAsRuntimeException(Exception e, String msg) {
 
 	/**
 	 * Returns a string containing the result of
-	 * {@link Exception#printStackTrace() toString()}.
+	 * {@link Exception#printStackTrace()}.
 	 */
 	@GwtIncompatible // java.io.PrintWriter, java.io.StringWriter
 	public static String getStackTraceAsString(Throwable e) {

gdx-gwt/src/main/java/gwt/emu/de/damios/guacamole/Exceptions.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright 2020 damios
+ * 
+ * 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.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.damios.guacamole;
+
+/**
+ * Static methods for dealing with exceptions.
+ * 
+ * @author damios
+ */
+public final class Exceptions {
+
+	private Exceptions() {
+		throw new UnsupportedOperationException();
+	}
+
+	public static void throwAsRuntimeException(Exception e) {
+		throw new RuntimeException(e);
+	}
+
+	public static void throwAsRuntimeException(Exception e, String msg) {
+		throw new RuntimeException(msg, e);
+	}
+
+	/**
+	 * Returns a string containing the result of
+	 * {@link Exception#printStackTrace()}.
+	 */
+	public static String getStackTraceAsString(Throwable e) {
+		return getStackTraceAsStringImpl(e, "", "");
+	}
+
+	// Inspired by the emulated Throwable#printStackTraceImpl
+	private static String getStackTraceAsStringImpl(Throwable e, String prefix,
+			String ident) {
+		String out = "\n" + ident + prefix + e.toString();
+		out += getStackTraceItems(e, ident);
+
+		for (Throwable t : e.getSuppressed()) {
+			out += getStackTraceAsStringImpl(t, "Suppressed: ", "\t" + ident);
+		}
+
+		Throwable theCause = e.getCause();
+		if (theCause != null) {
+			out += getStackTraceAsStringImpl(theCause, "Caused by: ", ident);
+		}
+
+		return out;
+	}
+
+	// Inspired by the emulated Throwable#printStackTraceItems
+	private static String getStackTraceItems(Throwable e, String ident) {
+		String out = "";
+		for (StackTraceElement element : e.getStackTrace()) {
+			out += "\n" + ident + "\tat " + element;
+		}
+
+		return out;
+	}
+
+}