diff --git a/asterix-maven-plugins/lexer-generator-maven-plugin/src/main/java/org/apache/asterix/lexergenerator/LexerGenerator.java b/asterix-maven-plugins/lexer-generator-maven-plugin/src/main/java/org/apache/asterix/lexergenerator/LexerGenerator.java
index 1588c39..3ae7339 100644
--- a/asterix-maven-plugins/lexer-generator-maven-plugin/src/main/java/org/apache/asterix/lexergenerator/LexerGenerator.java
+++ b/asterix-maven-plugins/lexer-generator-maven-plugin/src/main/java/org/apache/asterix/lexergenerator/LexerGenerator.java
@@ -131,14 +131,14 @@
         Set<String> functions = main.neededAuxFunctions();
         for (String token : functions) {
             result.append("private int parse_" + token
-                    + "(char currentChar) throws IOException, [LEXER_NAME]Exception{\n");
+                    + "(char currentChar) throws IOException {\n");
             result.append(tokens.get(token).getNode().toJavaAuxFunction());
             result.append("\n}\n\n");
         }
         return result.toString();
     }
 
-    private static String readFile(Reader input) throws FileNotFoundException, IOException {
+    private static String readFile(Reader input) throws IOException {
         StringBuffer fileData = new StringBuffer(1000);
         BufferedReader reader = new BufferedReader(input);
         char[] buf = new char[1024];
@@ -152,14 +152,14 @@
         return fileData.toString();
     }
 
-    private static String readFile(InputStream input) throws FileNotFoundException, IOException {
+    private static String readFile(InputStream input) throws IOException {
         if (input == null) {
             throw new FileNotFoundException();
         }
         return readFile(new InputStreamReader(input));
     }
 
-    private static String readFile(String fileName) throws FileNotFoundException, IOException {
+    private static String readFile(String fileName) throws IOException {
         return readFile(new FileReader(fileName));
     }
 
diff --git a/asterix-maven-plugins/lexer-generator-maven-plugin/src/main/resources/LexerException.java b/asterix-maven-plugins/lexer-generator-maven-plugin/src/main/resources/LexerException.java
index 9030eb2..2701319 100644
--- a/asterix-maven-plugins/lexer-generator-maven-plugin/src/main/resources/LexerException.java
+++ b/asterix-maven-plugins/lexer-generator-maven-plugin/src/main/resources/LexerException.java
@@ -18,7 +18,7 @@
  */
 package [PACKAGE];
 
-public class [LEXER_NAME]Exception extends Exception {
+public class [LEXER_NAME]Exception extends [EXCEPTION_SUPER_CLASS] {
 
     public [LEXER_NAME]Exception(String message) {
         super(message);
diff --git a/asterix-maven-plugins/lexer-generator-maven-plugin/src/main/resources/default.config b/asterix-maven-plugins/lexer-generator-maven-plugin/src/main/resources/default.config
index 63e0dd3..03a98dd 100644
--- a/asterix-maven-plugins/lexer-generator-maven-plugin/src/main/resources/default.config
+++ b/asterix-maven-plugins/lexer-generator-maven-plugin/src/main/resources/default.config
@@ -20,9 +20,10 @@
 # Place *first* the generic configuration
 # then list your grammar.
 
-PACKAGE:          com.my.lexer
-LEXER_NAME:       MyLexer
-OUTPUT_DIR:       output
+PACKAGE:               com.my.lexer
+LEXER_NAME:            MyLexer
+EXCEPTION_SUPER_CLASS: java.io.IOException
+OUTPUT_DIR:            output
 
 TOKENS: