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1   /**
2    *
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *     http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing, software
14   * distributed under the License is distributed on an "AS IS" BASIS,
15   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16   * See the License for the specific language governing permissions and
17   * limitations under the License.
18   */
19  package org.apache.hadoop.hbase.util;
20  
21  import java.util.HashSet;
22  import java.util.Set;
23  
24  import org.apache.hadoop.classification.InterfaceAudience;
25  import org.apache.hadoop.classification.InterfaceStability;
26  
27  /**
28   * Certain JVM versions are known to be unstable with HBase. This
29   * class has a utility function to determine whether the current JVM
30   * is known to be unstable.
31   */
32  @InterfaceAudience.Private
33  @InterfaceStability.Stable
34  public abstract class JvmVersion {
35    private static Set<String> BAD_JVM_VERSIONS = new HashSet<String>();
36    static {
37      BAD_JVM_VERSIONS.add("1.6.0_18");
38    }
39  
40    /**
41     * Return true if the current JVM is known to be unstable.
42     */
43    public static boolean isBadJvmVersion() {
44      String version = System.getProperty("java.version");
45      return version != null && BAD_JVM_VERSIONS.contains(version);
46    }
47  }