Here you can find the source of getScriptEngineManager()
public static synchronized ScriptEngineManager getScriptEngineManager()
//package com.java2s; /*//from ww w . j a v a 2 s . c om * Copyright 2015-2016 Jeeva Kandasamy (jkandasa@gmail.com) * and other contributors as indicated by the @author tags. * * 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 * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import javax.script.ScriptEngineManager; public class Main { private static ScriptEngineManager scriptEngineManager = null; public static synchronized ScriptEngineManager getScriptEngineManager() { if (scriptEngineManager == null) { scriptEngineManager = new ScriptEngineManager(); } return scriptEngineManager; } }