Eager initialize java_import'ed classes

This was originally done on purpose while working toward the
possibility of lazy imports, but it's better for now to just let
the class initialize and fail fast if there are linkage errors.

Fixes jruby#8299

Resolves regression discussed in jruby#799 that prevented consistent
error messages for unlinkable classes.

core/src/main/java/org/jruby/javasupport/ext/Module.java

@@ -113,7 +113,7 @@ private static IRubyObject javaImport(ThreadContext context, RubyModule target,
             if (className.contains("::")) {
                 throw runtime.newArgumentError("must use Java style name: " + className);
             }
-            javaClass = Java.getJavaClass(runtime, className, false); // raises NameError if not found
+            javaClass = Java.getJavaClass(runtime, className); // raises NameError if not found
         } else if (klass instanceof JavaPackage) {
             throw runtime.newArgumentError("java_import does not work for Java packages (try include_package instead)");
         } else if (klass instanceof RubyModule) {