Add method to define class for existing classloader

Reflect/src/main/java/eu/mikroskeem/utils/reflect/Reflect.java

@@ -160,4 +160,32 @@ public class Reflect {
             f.set(instance, value);
         } catch (NoSuchFieldException|IllegalAccessException ignored){}
     }
+
+    /**
+     * Load class from bytearray to existing class loader. Useful when you need to
+     * add generated class to classpath
+     *
+     * @param classLoader Class loader which defines given class
+     * @param name Class name
+     * @param data Class in bytearray
+     * @return Defined class
+     * @throws ClassFormatError thrown by ClassLoader
+     */
+    @Nullable
+    public static Class<?> defineClass(@NotNull ClassLoader classLoader, @NotNull String name, @NotNull byte[] data)
+            throws ClassFormatError {
+        Method defineClassMethod = Reflect.getMethod(ClassLoader.class, "defineClass",
+                String.class, byte[].class, int.class, int.class);
+        if(defineClassMethod != null){
+            try {
+                defineClassMethod.invoke(classLoader, name, data, 0, data.length);
+            } catch (InvocationTargetException e) {
+                if(e.getTargetException() instanceof ClassFormatError){
+                    throw (ClassFormatError)e.getTargetException();
+                }
+            }
+            catch (IllegalAccessException ignored){}
+        }
+        return null;
+    }
 }