Enhance null checks

pom.xml

@@ -36,6 +36,10 @@
     <contributor>
       <name>Tim Molter</name>
     </contributor>
+    <contributor>
+      <name>Sarp Güney Başaraner</name>
+      <url>https://github.com/sgbasaraner</url>
+    </contributor>
     <contributor>
       <name>Gabriel Bauman</name>
       <url>https://github.com/gabrielbauman</url>

src/changes/changes.xml

@@ -12,6 +12,9 @@
       <action dev="jodastephen" type="add">
         Add Tidelift commercial support and security policy.
       </action>
+      <action dev="sgbasaraner" type="fix">
+        Enhance null checks.
+      </action>
     </release>
     <release version="1.0.1" date="2018-08-20" description="v1.0.1">
       <action dev="jodastephen" type="fix">

src/main/java/org/joda/money/format/MoneyFormatter.java

@@ -70,10 +70,12 @@ static void checkNotNull(Object object, String message) {
      * @param parsers  the parsers, not null
      */
     MoneyFormatter(Locale locale, MoneyPrinter[] printers, MoneyParser[] parsers) {
-        assert locale != null;
-        assert printers != null;
-        assert parsers != null;
-        assert printers.length == parsers.length;
+        MoneyFormatter.checkNotNull(locale, "Locale must not be null");
+        MoneyFormatter.checkNotNull(printers, "Printers must not be null");
+        MoneyFormatter.checkNotNull(parsers, "Parsers must not be null");
+        if (printers.length != parsers.length) {
+            throw new IllegalArgumentException("Printers and parsers must match");
+        }
         this.locale = locale;
         this.printerParser = new MultiPrinterParser(printers, parsers);
     }
@@ -85,8 +87,8 @@ static void checkNotNull(Object object, String message) {
      * @param printerParser  the printer/parser, not null
      */
     private MoneyFormatter(Locale locale, MultiPrinterParser printerParser) {
-        assert locale != null;
-        assert printerParser != null;
+        MoneyFormatter.checkNotNull(locale, "Locale must not be null");
+        MoneyFormatter.checkNotNull(printerParser, "PrinterParser must not be null");
         this.locale = locale;
         this.printerParser = printerParser;
     }