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rmid



SYNOPSIS

       rmid [ options ]


DESCRIPTION

       The  rmid tool starts the activation system daemon. Before
       activatable objects can  be  either  registered  with  the
       activation  system  or activated in a Java VM, the activa­
       tion system daemon must be started.  See the RMI  Specifi­
       cation  and  Activation  Tutorials  for  details on how to
       write programs that use activatable remote objects.

       The daemon can be started by executing the  rmid  command,
       and specifying a security policy file, as follows:

            example% rmid -J-Djava.security.policy=rmid.policy

       Note:  When  running  Sun's  implementation  of  rmid,  by
       default you will need to specify a security policy file so
       that  rmid  can  verify  whether or not the information in
       each ActivationGroupDesc is allowed to be used to launch a
       JVM  for  an  activation group.  Specifically, the command
       and options specified by the  CommandEnvironment  and  any
       Properties  passed to an ActivationGroupDesc's constructor
       must now be explicitly allowed in the security policy file
       for  rmid.  The value of the sun.rmi.activation.execPolicy
       property dictates the policy that rmid uses  to  determine
       whether  or  not the information in an ActivationGroupDesc
       may be used to launch a JVM for an activation group.

       Executing rmid by default

              · starts the Activator and an internal registry  on
                the default port, 1098, and
              · binds    an    ActivationSystem   to   the   name
                java.rmi.activation.ActivationSystem   in    this
                internal registry.

       To  specify  an  alternate port for the registry, you must
       specify the -port option when starting up rmid.  For exam­
       ple,

            rmid -J-Djava.security.policy=rmid.policy -port 1099

       starts  the activation system daemon and a registry on the
       registry's default port, 1099.


OPTIONS

       The following options are supported:

       -CsomeCommandLineOption
              Specifies an option that is passed  as  a  command-
              line  argument  to  each  child process (activation

       -JsomeCommandLineOption
              Specifies an option that  is  passed  to  the  java
              interpreter  running rmid.  For example, to specify
              that rmid use a policy file named rmid.policy,  the
              -J  option  can  be  used  to define the java.secu­
              rity.policy property on rmid's command  line.   For
              example:

                   rmid -J-Djava.security.policy=rmid.policy

       -J-Dsun.rmi.activation.execPolicy=policy
              Specifies  the  policy  that  rmid employs to check
              commands and command-line options  used  to  launch
              the  JVM in which an activation group runs.  Please
              note that this option exists only in  Sun's  imple­
              mentation  of  the  RMI activation daemon.  If this
              property is not specified on the command line,  the
              result   is  the  same  as  if  -J-Dsun.rmi.activa­
              tion.execPolicy=default were specified.  The possi­
              ble  values  of policy can be default, policyClass­
              Name, or none:

              · default (or if this property is unspecified)  The
                default  execPolicy  allows  rmid to execute com­
                mands with specific command-line options only  if
                rmid has been granted permission to execute those
                commands and options in the security policy  file
                that  rmid  uses.   Only  the  default activation
                group implementation can be used with the default
                execution policy.

                rmid launches a JVM for an activation group using
                the information in the group's registered activa­
                tion  group  descriptor,  an ActivationGroupDesc.
                The group descriptor specifies an optional  Acti­
                vationGroupDesc.CommandEnvironment which includes
                the command to execute to  start  the  activation
                group  as  well as any command line options to be
                added to the command line.  By default, rmid uses
                the  java  command found in java.home.  The group
                descriptor  also  contains  properties  overrides
                that  are  added  to  the command line as options
                defined as:

                     -Dproperty=value

                The permission com.sun.rmi.rmid.ExecPermission is
                used  to  grant rmid permission to execute a com­
                mand, specified in the group descriptor's Comman­
                dEnvironment  to launch an activation group.  The
                permission  com.sun.rmi.rmid.ExecOptionPermission
                       command to launch an activation group.

                       Syntax
                       The name of an ExecPermission is the  path
                       name of a command to grant rmid permission
                       to execute.  A path name that ends in "/*"
                       indicates  all the files contained in that
                       directory (where "/" is the file-separator
                       character,  File.separatorChar).   A  path
                       name that ends  with  "/-"  indicates  all
                       files and subdirectories contained in that
                       directory (recursively).  A path name con­
                       sisting   of   the  special  token  "<<ALL
                       FILES>>" matches any file.

                       Note: A path name consisting of  a  single
                       "*" indicates all the files in the current
                       directory, while a path name consisting of
                       a  single  "-"  indicates all the files in
                       the current  directory  and  (recursively)
                       all  files and subdirectories contained in
                       the current directory.

                ExecOptionPermission
                       The ExecOptionPermission class  represents
                       permission for rmid to use a specific com­
                       mand-line option when launching an activa­
                       tion group.  The name of an ExecOptionPer­
                       mission is the value  of  a  command  line
                       option.

                       Syntax
                       Options support a limited wildcard scheme.
                       An asterisk signifies  a  wildcard  match,
                       and  it  may  appear  as  the  option name
                       itself (that is, it matches  any  option),
                       or  an  asterisk  may appear at the end of
                       the option name only if the asterisk  fol­
                       lows either a "." or "=".

                       For   example:   "*"   or   "-Dfoo.*"   or
                       "-Da.b.c=*" is valid; "*foo" or "-Da*b" or
                       "ab*" is not.

              Policy file for rmid
                When  granting rmid permission to execute various
                commands and options, the permissions ExecPermis­
                sion  and ExecOptionPermission need to be granted
                universally  (that  is,  granted  to   all   code
                sources).   It is safe to grant these permissions
                universally because only rmid checks  these  per­
                missions.
                    permission com.sun.rmi.rmid.ExecOptionPermission
                        "-Djava.security.debug=*";

                    permission com.sun.rmi.rmid.ExecOptionPermission
                        "-Dsun.rmi.*";
                };

                The first permission granted allow rmid  to  exe­
                cute the 1.2.2 version of the java command, spec­
                ified by its explicit path names.  Note  that  by
                default, the version of the java command found in
                java.home is used (the same one that rmid  uses),
                and  does  not need to be specified in the policy
                file.  The third permission allows rmid  to  exe­
                cute     any    command    in    the    directory
                /files/apps/rmidcmds.

                The fourth permission granted, an  ExecOptionPer­
                mission,  allows  rmid  to  launch  an activation
                group that defines the security policy file to be
                /files/policies/group.policy.   The  next permis­
                sion allows the java.security.debug  property  to
                be used by an activation group.  The last permis­
                sion allows any property in the sun.rmi  property
                name hierarchy to be used by activation groups.

                To  start rmid with a policy file, the java.secu­
                rity.policy property needs  to  be  specified  on
                rmid's command line.  For example:

                     rmid -J-Djava.security.policy=rmid.policy

              · policyClassName

                If  the  default behavior is not flexible enough,
                an administrator can provide, when starting rmid,
                the name of a class whose checkExecCommand method
                is executed in order to check commands to be exe­
                cuted by rmid.

                The policyClassName specifies a public class with
                a public, no-argument constructor and  an  imple­
                mentation   of   the  following  checkExecCommand
                method:

                     public void checkExecCommand(ActivationGroupDesc desc,
                                                              String[] command)
                                     throws SecurityException;

                Before launching an activation group, rmid  calls
                the  policy's checkExecCommand method, passing it
                the activation group descriptor and an array con­

       -log dir
              Specifies  the name of the directory the activation
              system daemon uses to write its database and  asso­
              ciated  information.  The log directory defaults to
              creating a directory,  log,  in  the  directory  in
              which the rmid command was executed.

       -port port
              Specifies the port rmid's registry uses.  The acti­
              vation system daemon  binds  the  ActivationSystem,
              with the name java.rmi.activation.ActivationSystem,
              in this registry.  Thus,  the  ActivationSystem  on
              the local machine can be obtained using the follow­
              ing Naming.lookup method call:

              import java.rmi.*;
              import java.rmi.activation.*;

              ActivationSystem system;
              system = (ActivationSystem)
              Naming.lookup("//:port/java.rmi.activation.ActivationSystem");

       -stop  Stops the current invocation of rmid,  for  a  port
              specified by the -port option.  If no port is spec­
              ified, it will stop the rmid running on port  1098.


ENVIRONMENT VARIABLES

       CLASSPATH           Used  to  provide the system a path to
                           user-defined classes.  Directories are
                           separated by colons.  For example,

                           example% .:/usr/local/java/classes


SEE ALSO

       rmic(1)

       See (or search java.sun.com) for the following:

       RMI Specification @
         http://java.sun.com/j2se/1.4/docs/guide/rmi/spec/rmi­
         TOC.doc.html

                          10 March 2001                   rmid(1)
  




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