android support! thanks to TachiWeb devs.

AndroidCompat/src/main/java/com/squareup/duktape/DuktapeException.java

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+/*
+ * Copyright (C) 2015 Square, Inc.
+ *
+ * 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 com.squareup.duktape;
+
+import android.support.annotation.Keep;
+
+import java.util.regex.Pattern;
+
+// Called from native code.
+@SuppressWarnings("unused")
+// Instruct ProGuard not to strip this type.
+@Keep
+public final class DuktapeException extends RuntimeException {
+
+    /**
+   * Duktape stack trace strings have multiple lines of the format "    at func (file.ext:line)".
+   * "func" is optional, but we'll omit frames without a function, since it means the frame is in
+   * native code.
+   */
+    private static final Pattern STACK_TRACE_PATTERN = null;
+
+    /** Java StackTraceElements require a class name.  We don't have one in JS, so use this. */
+    private static final String STACK_TRACE_CLASS_NAME = "JavaScript";
+
+    public DuktapeException(String detailMessage) {
+        super(detailMessage);
+    }
+}