JreVendor.java

  1. /*
  2.  * Licensed to the Apache Software Foundation (ASF) under one or more
  3.  * contributor license agreements.  See the NOTICE file distributed with
  4.  * this work for additional information regarding copyright ownership.
  5.  * The ASF licenses this file to You under the Apache License, Version 2.0
  6.  * (the "License"); you may not use this file except in compliance with
  7.  * the License.  You may obtain a copy of the License at
  8.  *
  9.  *      http://www.apache.org/licenses/LICENSE-2.0
  10.  *
  11.  * Unless required by applicable law or agreed to in writing, software
  12.  * distributed under the License is distributed on an "AS IS" BASIS,
  13.  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14.  * See the License for the specific language governing permissions and
  15.  * limitations under the License.
  16.  */
  17. package org.apache.tomcat.util.compat;

  18. import java.util.Locale;

  19. public class JreVendor {

  20.     static {
  21.         /*
  22.          * There are a few places where Tomcat either accesses JVM internals
  23.          * (e.g. the memory leak protection) or where feature support varies
  24.          * between JVMs (e.g. SPNEGO). These flags exist to enable Tomcat to
  25.          * adjust its behaviour based on the vendor of the JVM. In an ideal
  26.          * world this code would not exist.
  27.          */
  28.         String vendor = System.getProperty("java.vendor", "");
  29.         vendor = vendor.toLowerCase(Locale.ENGLISH);

  30.         if (vendor.startsWith("oracle") || vendor.startsWith("sun")) {
  31.             IS_ORACLE_JVM = true;
  32.             IS_IBM_JVM = false;
  33.         } else if (vendor.contains("ibm")) {
  34.             IS_ORACLE_JVM = false;
  35.             IS_IBM_JVM = true;
  36.         } else {
  37.             IS_ORACLE_JVM = false;
  38.             IS_IBM_JVM = false;
  39.         }
  40.     }

  41.     public static final boolean IS_ORACLE_JVM;

  42.     public static final boolean IS_IBM_JVM;
  43. }