Package net.bytebuddy.agent

Class Attacher

  • public class Attacher
extends java.lang.Object
    A Java program that attaches a Java agent to an external process.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      private static java.lang.String ATTACH_METHOD_NAME
      The name of the attach method of the VirtualMachine class.
      private static java.lang.String DETACH_METHOD_NAME
      The name of the detach method of the VirtualMachine class.
      private static java.lang.String LOAD_AGENT_METHOD_NAME
      The name of the loadAgent method of the VirtualMachine class.
      private static java.lang.String LOAD_AGENT_PATH_METHOD_NAME
      The name of the loadAgentPath method of the VirtualMachine class.
      private static java.lang.Object STATIC_MEMBER
      Base for access to a reflective member to make the code more readable.

    • Constructor Summary

      Constructors 
      Modifier Constructor Description
      private Attacher()
      The attacher provides only static utility methods and should not be instantiated.

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      protected static void install​(java.lang.Class<?> virtualMachineType, java.lang.String processId, java.lang.String agent, boolean isNative, java.lang.String argument)
      Installs a Java agent on a target VM.
      static void main​(java.lang.String[] args)
      Runs the attacher as a Java application.

      • Methods inherited from class java.lang.Object

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

    • Field Detail

      • STATIC_MEMBER

        private static final java.lang.Object STATIC_MEMBER
        Base for access to a reflective member to make the code more readable.

      • ATTACH_METHOD_NAME

        private static final java.lang.String ATTACH_METHOD_NAME
        The name of the attach method of the VirtualMachine class.
        See Also:
        Constant Field Values

      • LOAD_AGENT_METHOD_NAME

        private static final java.lang.String LOAD_AGENT_METHOD_NAME
        The name of the loadAgent method of the VirtualMachine class.
        See Also:
        Constant Field Values

      • LOAD_AGENT_PATH_METHOD_NAME

        private static final java.lang.String LOAD_AGENT_PATH_METHOD_NAME
        The name of the loadAgentPath method of the VirtualMachine class.
        See Also:
        Constant Field Values

      • DETACH_METHOD_NAME

        private static final java.lang.String DETACH_METHOD_NAME
        The name of the detach method of the VirtualMachine class.
        See Also:
        Constant Field Values

    • Constructor Detail

      • Attacher

        private Attacher()
        The attacher provides only static utility methods and should not be instantiated.

    • Method Detail

      • main

        public static void main​(java.lang.String[] args)
        Runs the attacher as a Java application.
        Parameters:
        args - A list containing the fully qualified name of the virtual machine type, the process id, the fully qualified name of the Java agent jar followed by an empty string if the argument to the agent is null or any number of strings where the first argument is proceeded by any single character which is stripped off.

      • install

        protected static void install​(java.lang.Class<?> virtualMachineType,
                              java.lang.String processId,
                              java.lang.String agent,
                              boolean isNative,
                              java.lang.String argument)
                       throws java.lang.NoSuchMethodException,
                              java.lang.reflect.InvocationTargetException,
                              java.lang.IllegalAccessException
        Installs a Java agent on a target VM.
        Parameters:
        virtualMachineType - The virtual machine type to use for the external attachment.
        processId - The id of the process being target of the external attachment.
        agent - The Java agent to attach.
        isNative - true if the agent is native.
        argument - The argument to provide or null if no argument is provided.
        Throws:
        java.lang.NoSuchMethodException - If the virtual machine type does not define an expected method.
        java.lang.reflect.InvocationTargetException - If the virtual machine type raises an error.
        java.lang.IllegalAccessException - If a method of the virtual machine type cannot be accessed.