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				+/* 
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				+ * Copyright 2002-2018 the original author or authors. 
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				+ * 
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				+ * Licensed under the Apache License, Version 2.0 (the "License"); 
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				+ * you may not use this file except in compliance with the License. 
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				+ * You may obtain a copy of the License at 
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				+ * 
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				+ *      https://www.apache.org/licenses/LICENSE-2.0 
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				+ * 
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				+ * Unless required by applicable law or agreed to in writing, software 
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				+ * distributed under the License is distributed on an "AS IS" BASIS, 
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				+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
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				+ * See the License for the specific language governing permissions and 
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				+ * limitations under the License. 
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				+ */ 
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				+package org.springframework.security.oauth2.server.authorization.http.converter; 
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				+ 
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				+import org.springframework.http.converter.GenericHttpMessageConverter; 
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				+import org.springframework.http.converter.HttpMessageConverter; 
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				+import org.springframework.http.converter.json.GsonHttpMessageConverter; 
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				+import org.springframework.http.converter.json.JsonbHttpMessageConverter; 
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				+import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter; 
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				+import org.springframework.util.ClassUtils; 
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				+ 
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				+/** 
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				+ * TODO 
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				+ * This class is a straight copy from Spring Security. 
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				+ * It should be consolidated when merging this codebase into Spring Security. 
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				+ * 
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				+ * Utility methods for {@link HttpMessageConverter}'s. 
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				+ * 
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				+ * @author Joe Grandja 
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				+ * @since 5.1 
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				+ */ 
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				+final class HttpMessageConverters { 
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				+ 
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				+	private static final boolean jackson2Present; 
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				+ 
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				+	private static final boolean gsonPresent; 
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				+ 
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				+	private static final boolean jsonbPresent; 
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				+ 
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				+	static { 
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				+		ClassLoader classLoader = HttpMessageConverters.class.getClassLoader(); 
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				+		jackson2Present = ClassUtils.isPresent("com.fasterxml.jackson.databind.ObjectMapper", classLoader) 
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				+				&& ClassUtils.isPresent("com.fasterxml.jackson.core.JsonGenerator", classLoader); 
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				+		gsonPresent = ClassUtils.isPresent("com.google.gson.Gson", classLoader); 
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				+		jsonbPresent = ClassUtils.isPresent("javax.json.bind.Jsonb", classLoader); 
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				+	} 
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				+ 
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				+	private HttpMessageConverters() { 
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				+	} 
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				+ 
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				+	static GenericHttpMessageConverter<Object> getJsonMessageConverter() { 
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				+		if (jackson2Present) { 
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				+			return new MappingJackson2HttpMessageConverter(); 
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				+		} 
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				+		if (gsonPresent) { 
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				+			return new GsonHttpMessageConverter(); 
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				+		} 
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				+		if (jsonbPresent) { 
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				+			return new JsonbHttpMessageConverter(); 
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				+		} 
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				+		return null; 
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				+	} 
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				+ 
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				+} 
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