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  * Copyright 2003-2007 the original author or authors.
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package groovy.lang;
public final class GroovySystem {
    //  TODO: make this initialization able to set useReflection true
    //  TODO: have some way of specifying another MetaClass Registry implementation
    static {
         = true;
         = new MetaClassRegistryImpl();
The MetaClass for java.lang.Object
    private static MetaClass objectMetaClass;
If true then the MetaClass will only use reflection for method dispatch, property acess, etc.
    private static final boolean USE_REFLECTION;
Reference to the MetaClass Registry to be used by the Groovy run time system to map classes to MetaClasses
    private static final MetaClassRegistry META_CLASS_REGISTRY;
    private static boolean keepJavaMetaClasses=false;
    private GroovySystem() {
        // Do not allow this class to be instantiated
    public static boolean isUseReflection() {
        return ;
    public static MetaClassRegistry getMetaClassRegistry() {
        return ;
    public static void setKeepJavaMetaClasses(boolean keepJavaMetaClasses) {
        . = keepJavaMetaClasses;
    public static boolean isKeepJavaMetaClasses() {
        return ;
This method can be used to ensure that no threaded created by a reference manager will be active. This is useful if the Groovy runtime itself is loaded through a class loader which should be disposed off. Without calling this method and if a threaded reference manager is active the class loader cannot be unloaded! Per default no threaded manager will be used.

    public static void stopThreadedReferenceManager() {
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