Package org.apache.derby.iapi.services.info

Class JVMInfo

  • public abstract class JVMInfo
extends java.lang.Object
    This class is used to determine which Java specification Derby will run at. For a useful discussion of how this class is used, please see DERBY-3176.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static int J2SE_18  
      static int JDK_ID
      The JVM's runtime environment.

    • Constructor Summary

      Constructors 
      Constructor Description
      JVMInfo()  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static java.lang.String derbyVMLevel()
      Return Derby's understanding of the virtual machine's environment.
      private static java.lang.String getSystemProperty​(java.lang.String name)
      Get system property.
      static boolean hasJNDI()
      Determine whether we are running in a constrained environment.
      static boolean isIBMJVM()
      Check whether this is IBM jvm.
      static boolean isSunJVM()
      Check whether this is sun jvm.
      static void javaDump()
      For IBM jvm, this method will dump more diagnostic information to file.
      static int jdbcMajorVersion()  
      static int jdbcMinorVersion()  

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Field Detail

      • JDK_ID

        public static final int JDK_ID
        The JVM's runtime environment.
        • 1 - not used was JDK 1.1
        • 2 - not used, was for JDK 1.2 and 1.3
        • 4 - not used, was for JDK 1.4.0 or 1.4.1
        • 5 - not used, was for JDK 1.4.2
        • 6 - not used, was for JDK 1.5
        • 7 - not used, was for JDK 1.6
        • 8 - not used, was for JDK 1.7
        • 9 - J2SE_18 - JDK 1.8

    • Constructor Detail

      • JVMInfo

        public JVMInfo()

    • Method Detail

      • jdbcMajorVersion

        public static int jdbcMajorVersion()

      • jdbcMinorVersion

        public static int jdbcMinorVersion()

      • derbyVMLevel

        public static java.lang.String derbyVMLevel()
        Return Derby's understanding of the virtual machine's environment.

      • getSystemProperty

        private static java.lang.String getSystemProperty​(java.lang.String name)
        Get system property.
        Parameters:
        name - name of the property

      • isSunJVM

        public static final boolean isSunJVM()
        Check whether this is sun jvm.
        Returns:
        true if it is sun jvm, false if it is not sun jvm

      • isIBMJVM

        public static final boolean isIBMJVM()
        Check whether this is IBM jvm.
        Returns:
        true if it is IBM jvm, false if it is not IBM jvm

      • javaDump

        public static void javaDump()
        For IBM jvm, this method will dump more diagnostic information to file. JVM specific code for other vender can be added. DERBY-4856

      • hasJNDI

        public static boolean hasJNDI()
        Determine whether we are running in a constrained environment.
        Returns:
        true if JNDI is available