Ensure we have a classloader to boot from

If JRuby is loaded in the bootstrap classloader, the direct
getClassLoader for a Class object might return null. Use the
alternative Ruby.getClassLoader instead which will fall back on
the standard system classloader.

Author: headius

core/src/main/java/org/jruby/Ruby.java

@@ -2630,7 +2630,7 @@ public RubyObjectSpecializer getObjectSpecializer() {
     }
 
     public static ClassLoader getClassLoader() {
-        // we try to getService the classloader that loaded JRuby, falling back on System
+        // we try to get the classloader that loaded JRuby, falling back on System
         ClassLoader loader = Ruby.class.getClassLoader();
         if (loader == null) {
             loader = ClassLoader.getSystemClassLoader();

core/src/main/java/org/jruby/ext/bigdecimal/BigDecimalLibrary.java

@@ -43,6 +43,6 @@ public void load(Ruby runtime, boolean wrap) throws IOException {
         RubyBigDecimal.createBigDecimal(context);
 
         // using load since this file does not exist in MRI
-        loadService(context).loadFromClassLoader(Ruby.class.getClassLoader(), "jruby/bigdecimal.rb", false);
+        loadService(context).loadFromClassLoader(Ruby.getClassLoader(), "jruby/bigdecimal.rb", false);
     }
 }// BigDecimalLibrary

core/src/main/java/org/jruby/javasupport/Java.java

@@ -139,7 +139,7 @@ public void load(Ruby runtime, boolean wrap) {
         RubyClass objectClass = (RubyClass) getProxyClass(context, java.lang.Object.class);
 
         // load Ruby parts of the 'java' library
-        loadService(context).loadFromClassLoader(Ruby.class.getClassLoader(), "jruby/java.rb", false);
+        loadService(context).loadFromClassLoader(Ruby.getClassLoader(), "jruby/java.rb", false);
 
         // rewire ArrayJavaProxy superclass to point at Object, so it inherits Object behaviors
         Access.getClass(context, "ArrayJavaProxy").