rmid.1 revision 6073:cea72c2bf071
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Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 19219820Sjeff." or visit www.oracle.com if you need additional information or have any 20219820Sjeff." questions. 21219820Sjeff." 22219820Sjeff.TH rmid 1 "10 May 2011" 23219820Sjeff 24219820Sjeff.LP 25219820Sjeff.SH "Name" 26219820Sjeffrmid \- The Java RMI Activation System Daemon 27219820Sjeff.LP 28219820Sjeff.LP 29219820Sjeff\f3rmid\fP starts the activation system daemon that allows objects to be registered and activated in a virtual machine (VM). 30219820Sjeff.LP 31219820Sjeff.SH "SYNOPSIS" 32219820Sjeff.LP 33219820Sjeff.nf 34219820Sjeff\f3 35219820Sjeff.fl 36219820Sjeffrmid [options] 37219820Sjeff.fl 38219820Sjeff\fP 39219820Sjeff.fi 40 41.LP 42.SH "DESCRIPTION" 43.LP 44.LP 45The \f3rmid\fP tool starts the activation system daemon. The activation system daemon must be started before activatable objects can be either registered with the activation system or activated in a VM. See the 46.na 47\f2Java RMI Specification\fP @ 48.fi 49http://download.oracle.com/javase/7/docs/platform/rmi/spec/rmiTOC.html and 50.na 51\f2Activation tutorials\fP @ 52.fi 53http://download.oracle.com/javase/7/docs/technotes/guides/rmi/activation/overview.html for details on how to write programs that use activatable remote objects. 54.LP 55.LP 56The daemon can be started by executing the \f2rmid\fP command, and specifying a security policy file, as follows: 57.LP 58.nf 59\f3 60.fl 61 rmid \-J\-Djava.security.policy=rmid.policy 62.fl 63\fP 64.fi 65 66.LP 67.LP 68\f3Note:\fP When running Sun's implementation of \f2rmid\fP, by default you will need to specify a security policy file so that \f2rmid\fP can verify whether or not the information in each \f2ActivationGroupDesc\fP is allowed to be used to launch a VM for an activation group. Specifically, the command and options specified by the \f2CommandEnvironment\fP and any \f2Properties\fP passed to an \f2ActivationGroupDesc\fP's constructor must now be explicitly allowed in the security policy file for \f2rmid\fP. The value of the \f2sun.rmi.activation.execPolicy\fP property dictates the policy that \f2rmid\fP uses to determine whether or not the information in an \f2ActivationGroupDesc\fP may be used to launch a VM for an activation group. 69.LP 70.LP 71Executing \f2rmid\fP by default 72.LP 73.RS 3 74.TP 2 75o 76starts the Activator and an internal registry on the default port, 1098, and 77.TP 2 78o 79binds an \f2ActivationSystem\fP to the name \f2java.rmi.activation.ActivationSystem\fP in this internal registry. 80.RE 81 82.LP 83.LP 84To specify an alternate port for the registry, you must specify the \f2\-port\fP option when starting up \f2rmid\fP. For example, 85.LP 86.nf 87\f3 88.fl 89 rmid \-J\-Djava.security.policy=rmid.policy \-port 1099 90.fl 91\fP 92.fi 93 94.LP 95.LP 96starts the activation system daemon and a registry on the registry's default port, 1099. 97.LP 98.SS 99Starting rmid from inetd/xinetd 100.LP 101.LP 102An alternative to starting \f2rmid\fP from the command line is to configure \f2inetd\fP (Solaris) or \f2xinetd\fP (Bsd) to start \f2rmid\fP on demand. 103.LP 104.LP 105When \f2rmid\fP starts up, it attempts to obtain an inherited channel (inherited from \f2inetd\fP/\f2xinetd\fP) by invoking the \f2System.inheritedChannel\fP method. If the inherited channel is \f2null\fP or not an instance of \f2java.nio.channels.ServerSocketChannel\fP, then \f2rmid\fP assumes that it was not started by \f2inetd\fP/\f2xinetd\fP, and it starts up as described above. 106.LP 107.LP 108If the inherited channel is a \f2ServerSocketChannel\fP instance, then \f2rmid\fP uses the \f2java.net.ServerSocket\fP obtained from the \f2ServerSocketChannel\fP as the server socket that accepts requests for the remote objects it exports, namely the registry in which the \f2java.rmi.activation.ActivationSystem\fP is bound and the \f2java.rmi.activation.Activator\fP remote object. In this mode, \f2rmid\fP behaves the same as when it is started from the command line, \f2except\fP: 109.LP 110.RS 3 111.TP 2 112o 113Output printed to \f2System.err\fP is redirected to a file. This file is located in the directory specified by the \f2java.io.tmpdir\fP system property (typically \f2/var/tmp\fP or \f2/tmp\fP) with the prefix \f2"rmid\-err"\fP and the suffix \f2"tmp"\fP. 114.TP 2 115o 116The \f2\-port\fP option is disallowed. If this option is specified, \f2rmid\fP will exit with an error message. 117.TP 2 118o 119The \f2\-log\fP option is required. If this option is not specified, \f2rmid\fP will exit with an error message. 120.RE 121 122.LP 123.LP 124See the man pages for \f2inetd\fP (Solaris) or \f2xinetd\fP (Bsd) for details on how to configure services to be started on demand. 125.LP 126.SH "OPTIONS" 127.LP 128.RS 3 129.TP 3 130\-C<someCommandLineOption> 131Specifies an option that is passed as a command\-line argument to each child process (activation group) of \f2rmid\fP when that process is created. For example, you could pass a property to each virtual machine spawned by the activation system daemon: 132.nf 133\f3 134.fl 135 rmid \-C\-Dsome.property=value 136.fl 137\fP 138.fi 139This ability to pass command\-line arguments to child processes can be useful for debugging. For example, the following command: 140.nf 141\f3 142.fl 143 rmid \-C\-Djava.rmi.server.logCalls=true 144.fl 145\fP 146.fi 147will enable server\-call logging in all child VMs. 148.LP 149.TP 3 150\-J<someCommandLineOption> 151Specifies an option that is passed to the \f2java\fP interpreter running \f2rmid\fP. For example, to specify that \f2rmid\fP use a policy file named \f2rmid.policy\fP, the \f2\-J\fP option can be used to define the \f2java.security.policy\fP property on \f2rmid\fP's command line, for example: 152.nf 153\f3 154.fl 155 rmid \-J\-Djava.security.policy=rmid.policy 156.fl 157\fP 158.fi 159.TP 3 160\-J\-Dsun.rmi.activation.execPolicy=<policy> 161Specifies the policy that \f2rmid\fP employs to check commands and command\-line options used to launch the VM in which an activation group runs. Please note that this option exists only in Sun's implementation of the Java RMI activation daemon. If this property is not specified on the command line, the result is the same as if \f2\-J\-Dsun.rmi.activation.execPolicy=default\fP were specified. The possible values of \f2<policy>\fP can be \f2default\fP, \f2<policyClassName>\fP, or \f2none\fP: 162.RS 3 163.TP 2 164o 165\f3default (or if this property is \fP\f4unspecified\fP\f3)\fP 166.LP 167The default \f2execPolicy\fP allows \f2rmid\fP to execute commands with specific command\-line options only if \f2rmid\fP has been granted permission to execute those commands and options in the security policy file that \f2rmid\fP uses. Only the default activation group implementation can be used with the \f2default\fP execution policy. 168.LP 169\f2rmid\fP launches a VM for an activation group using the information in the group's registered activation group descriptor, an \f2ActivationGroupDesc\fP. The group descriptor specifies an optional \f2ActivationGroupDesc.CommandEnvironment\fP which includes the \f2command\fP to execute to start the activation group as well as any command line \f2options\fP to be added to the command line. By default, \f2rmid\fP uses the \f2java\fP command found in \f2java.home\fP. The group descriptor also contains \f2properties\fP overrides that are added to the command line as options defined as: 170.nf 171\f3 172.fl 173 \-D\fP\f4<property>\fP\f3=\fP\f4<value>\fP\f3 174.fl 175\fP 176.fi 177.LP 178The permission \f2com.sun.rmi.rmid.ExecPermission\fP is used to grant \f2rmid\fP permission to execute a command, specified in the group descriptor's \f2CommandEnvironment\fP to launch an activation group. The permission \f2com.sun.rmi.rmid.ExecOptionPermission\fP is used to allow \f2rmid\fP to use command\-line options, specified as properties overrides in the group descriptor or as options in the \f2CommandEnvironment\fP, when launching the activation group. 179.LP 180When granting \f2rmid\fP permission to execute various commands and options, the permissions \f2ExecPermission\fP and \f2ExecOptionPermission\fP need to be granted universally (i.e., granted to all code sources). 181.RS 3 182.TP 3 183ExecPermission 184The \f2ExecPermission\fP class represents permission for \f2rmid\fP to execute a specific \f2command\fP to launch an activation group. 185.LP 186\f3Syntax\fP 187.br 188The \f2name\fP of an \f2ExecPermission\fP is the path name of a command to grant \f2rmid\fP permission to execute. A path name that ends in "/*" indicates all the files contained in that directory (where "/" is the file\-separator character, \f2File.separatorChar\fP). A path name that ends with "/\-" indicates all files and subdirectories contained in that directory (recursively). A path name consisting of the special token "<<ALL FILES>>" matches \f3any\fP file. 189.LP 190\f3Note:\fP 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. 191.TP 3 192ExecOptionPermission 193The \f2ExecOptionPermission\fP class represents permission for \f2rmid\fP to use a specific command\-line \f2option\fP when launching an activation group. The \f2name\fP of an \f2ExecOptionPermission\fP is the value of a command line option. 194.LP 195\f3Syntax\fP 196.br 197Options support a limited wildcard scheme. An asterisk signifies a wildcard match, and it may appear as the option name itself (i.e., it matches any option), or an asterisk may appear at the end of the option name only if the asterisk follows either a "." or "=". 198.LP 199For example: "*" or "\-Dfoo.*" or "\-Da.b.c=*" is valid, "*foo" or "\-Da*b" or "ab*" is not. 200.TP 3 201Policy file for rmid 202When granting \f2rmid\fP permission to execute various commands and options, the permissions \f2ExecPermission\fP and \f2ExecOptionPermission\fP need to be granted universally (i.e., granted to all code sources). It is safe to grant these permissions universally because only \f2rmid\fP checks these permissions. 203.LP 204An example policy file that grants various execute permissions to \f2rmid\fP is: 205.nf 206\f3 207.fl 208grant { 209.fl 210 permission com.sun.rmi.rmid.ExecPermission 211.fl 212 "/files/apps/java/jdk1.7.0/solaris/bin/java"; 213.fl 214 215.fl 216 permission com.sun.rmi.rmid.ExecPermission 217.fl 218 "/files/apps/rmidcmds/*"; 219.fl 220 221.fl 222 permission com.sun.rmi.rmid.ExecOptionPermission 223.fl 224 "\-Djava.security.policy=/files/policies/group.policy"; 225.fl 226 227.fl 228 permission com.sun.rmi.rmid.ExecOptionPermission 229.fl 230 "\-Djava.security.debug=*"; 231.fl 232 233.fl 234 permission com.sun.rmi.rmid.ExecOptionPermission 235.fl 236 "\-Dsun.rmi.*"; 237.fl 238}; 239.fl 240\fP 241.fi 242The first permission granted allow \f2rmid\fP to execute the 1.7.0 version of the \f2java\fP command, specified by its explicit path name. Note that by default, the version of the \f2java\fP command found in \f2java.home\fP is used (the same one that \f2rmid\fP uses), and does not need to be specified in the policy file. The second permission allows \f2rmid\fP to execute any command in the directory \f2/files/apps/rmidcmds\fP. 243.LP 244The third permission granted, an \f2ExecOptionPermission\fP, allows \f2rmid\fP to launch an activation group that defines the security policy file to be \f2/files/policies/group.policy\fP. The next permission allows the \f2java.security.debug\fP property to be used by an activation group. The last permission allows any property in the \f2sun.rmi\fP property name hierarchy to be used by activation groups. 245.LP 246To start \f2rmid\fP with a policy file, the \f2java.security.policy\fP property needs to be specified on \f2rmid\fP's command line, for example: 247.LP 248\f2rmid \-J\-Djava.security.policy=rmid.policy\fP 249.RE 250.TP 2 251o 252\f4<policyClassName>\fP 253.LP 254If the default behavior is not flexible enough, an administrator can provide, when starting \f2rmid\fP, the name of a class whose \f2checkExecCommand\fP method is executed in order to check commands to be executed by rmid. 255.LP 256The \f2policyClassName\fP specifies a public class with a public, no\-argument constructor and an implementation of the following \f2checkExecCommand\fP method: 257.nf 258\f3 259.fl 260 public void checkExecCommand(ActivationGroupDesc desc, 261.fl 262 String[] command) 263.fl 264 throws SecurityException; 265.fl 266\fP 267.fi 268Before launching an activation group, \f2rmid\fP calls the policy's \f2checkExecCommand\fP method, passing it the activation group descriptor and an array containing the complete command to launch the activation group. If the \f2checkExecCommand\fP throws a \f2SecurityException\fP, \f2rmid\fP will not launch the activation group and an \f2ActivationException\fP will be thrown to the caller attempting to activate the object. 269.TP 2 270o 271\f3none\fP 272.LP 273If the \f2sun.rmi.activation.execPolicy\fP property value is "none", then \f2rmid\fP will not perform any validation of commands to launch activation groups. 274.RE 275.LP 276.TP 3 277\-log dir 278Specifies the name of the directory the activation system daemon uses to write its database and associated information. The log directory defaults to creating a directory, \f2log\fP, in the directory in which the \f2rmid\fP command was executed. 279.LP 280.TP 3 281\-port port 282Specifies the port \f2rmid\fP's registry uses. The activation system daemon binds the \f2ActivationSystem\fP, with the name \f2java.rmi.activation.ActivationSystem\fP, in this registry. Thus, the \f2ActivationSystem\fP on the local machine can be obtained using the following \f2Naming.lookup\fP method call: 283.nf 284\f3 285.fl 286 import java.rmi.*; 287.fl 288 import java.rmi.activation.*; 289.fl 290 291.fl 292 ActivationSystem system; system = (ActivationSystem) 293.fl 294 Naming.lookup("//:\fP\f4port\fP/java.rmi.activation.ActivationSystem"); 295.fl 296.fi 297.TP 3 298\-stop 299Stops the current invocation of \f2rmid\fP, for a port specified by the \f2\-port\fP option. If no port is specified, it will stop the \f2rmid\fP running on port 1098. 300.RE 301 302.LP 303.SH "ENVIRONMENT VARIABLES" 304.LP 305.RS 3 306.TP 3 307CLASSPATH 308Used to provide the system a path to user\-defined classes. Directories are separated by colons. For example: 309.nf 310\f3 311.fl 312 .:/usr/local/java/classes 313.fl 314\fP 315.fi 316.RE 317 318.LP 319.SH "SEE ALSO" 320.LP 321.LP 322rmic(1), 323.na 324\f2CLASSPATH\fP @ 325.fi 326http://download.oracle.com/javase/7/docs/technotes/tools/index.html#classpath, java(1) 327.LP 328 329