org.apache.shiro.util

Class JavaEnvironment


  • public abstract class JavaEnvironment
extends Object
    Internal helper class used to find the Java/JDK version that Shiro is operating within, to allow for automatically adapting to the present platform's capabilities.

    Note that Shiro does not support 1.2 or earlier JVMs - only 1.3 and later.

    This class was borrowed and heavily based upon a nearly identical version found in the Spring Framework, with minor modifications. The original author names and copyright (Apache 2.0) has been left in place. A special thanks to Rod Johnson, Juergen Hoeller, and Rick Evans for making this available.

    Since:
    0.2

    • Field Summary

      Fields

      Modifier and Type Field and Description
      static int JAVA_13
      Constant identifying the 1.3.x JVM (JDK 1.3).
      static int JAVA_14
      Constant identifying the 1.4.x JVM (J2SE 1.4).
      static int JAVA_15
      Constant identifying the 1.5 JVM (Java 5).
      static int JAVA_16
      Constant identifying the 1.6 JVM (Java 6).
      static int JAVA_17
      Constant identifying the 1.7 JVM.

    • Constructor Summary

      Constructors

      Constructor and Description
      JavaEnvironment()
       

    • Field Detail

      • JAVA_13

        public static final int JAVA_13
        Constant identifying the 1.3.x JVM (JDK 1.3).
        See Also:
        Constant Field Values

      • JAVA_14

        public static final int JAVA_14
        Constant identifying the 1.4.x JVM (J2SE 1.4).
        See Also:
        Constant Field Values

      • JAVA_15

        public static final int JAVA_15
        Constant identifying the 1.5 JVM (Java 5).
        See Also:
        Constant Field Values

      • JAVA_16

        public static final int JAVA_16
        Constant identifying the 1.6 JVM (Java 6).
        See Also:
        Constant Field Values

      • JAVA_17

        public static final int JAVA_17
        Constant identifying the 1.7 JVM.
        See Also:
        Constant Field Values

    • Constructor Detail

      • JavaEnvironment

        public JavaEnvironment()

    • Method Detail

      • getVersion

        public static String getVersion()
        Return the full Java version string, as returned by System.getProperty("java.version").
        Returns:
        the full Java version string
        See Also:
        System.getProperty(String)

      • getMajorVersion

        public static int getMajorVersion()
        Get the major version code. This means we can do things like if (getMajorVersion() < JAVA_14).
        Returns:
        a code comparable to the JAVA_XX codes in this class
        See Also:
        JAVA_13, JAVA_14, JAVA_15, JAVA_16, JAVA_17

      • isAtLeastVersion14

        public static boolean isAtLeastVersion14()
        Convenience method to determine if the current JVM is at least Java 1.4.
        Returns:
        true if the current JVM is at least Java 1.4
        See Also:
        getMajorVersion(), JAVA_14, JAVA_15, JAVA_16, JAVA_17

      • isAtLeastVersion15

        public static boolean isAtLeastVersion15()
        Convenience method to determine if the current JVM is at least Java 1.5 (Java 5).
        Returns:
        true if the current JVM is at least Java 1.5
        See Also:
        getMajorVersion(), JAVA_15, JAVA_16, JAVA_17

      • isAtLeastVersion16

        public static boolean isAtLeastVersion16()
        Convenience method to determine if the current JVM is at least Java 1.6 (Java 6).
        Returns:
        true if the current JVM is at least Java 1.6
        Since:
        1.2
        See Also:
        getMajorVersion(), JAVA_15, JAVA_16, JAVA_17