The Session class represents a mail session and is not subclassed. It collects together properties and defaults used by the mail API's. A single default session can be shared by multiple applications on the desktop. Unshared sessions can also be created. The Session class provides access to the protocol providers that implement the Store, Transport, and related classes. The protocol providers are configured using the following files:   javamail.providers and javamail.default.providers   javamail.address.map and javamail.default.address.map   Each javamail.X resource file is searched for using three methods in the following order:   java.home/lib/javamail.X   META-INF/javamail.X   META-INF/javamail.default.X   The first method allows the user to include their own version of the resource file by placing it in the lib directory where the java.home property points. The second method allows an application that uses the JavaMail APIs to include their own resource files in their application's or jar file's META-INF directory. The javamail.default.X default files are part of the JavaMail mail.jar file. File location depends upon how the ClassLoader method getResource is implemented. Usually, the getResource method searches through CLASSPATH until it finds the requested file and then stops. JDK 1.1 has a limitation that the number of files of each name that will be found in the CLASSPATH is limited to one. However, this only affects method two, above; method one is loaded from a specific location (if allowed by the SecurityManager) and method three uses a different name to ensure that the default resource file is always loaded successfully. J2SE 1.2 and later are not limited to one file of a given name. The ordering of entries in the resource files matters. If multiple entries exist, the first entries take precedence over the later entries. For example, the first IMAP provider found will be set as the default IMAP implementation until explicitly changed by the application. The user- or system-supplied resource files augment, they do not override, the default files included with the JavaMail APIs. This means that all entries in all files loaded will be available. javamail.providers and javamail.default.providers These resource files specify the stores and transports that are available on the system, allowing an application to "discover" what store and transport implementations are available. The protocol implementations are listed one per line. The file format defines four attributes that describe a protocol implementation. Each attribute is an "="-separated name-value pair with the name in lowercase. Each name-value pair is semi-colon (";") separated. The following names are defined. Attribute Names in Providers Files NameDescription protocol Name assigned to protocol. For example, smtp for Transport. type Valid entries are store and transport. class Class name that implements this protocol. vendor Optional string identifying the vendor. version Optional string identifying the version. Here's an example of META-INF/javamail.default.providers file contents: protocol=imap; type=store; class=com.sun.mail.imap.IMAPStore; vendor=Sun Microsystems, Inc.; protocol=smtp; type=transport; class=com.sun.mail.smtp.SMTPTransport; vendor=Sun Microsystems, Inc.; javamail.address.map and javamail.default.address.map These resource files map transport address types to the transport protocol. The getType method of javax.mail.Address returns the address type. The javamail.address.map file maps the transport type to the protocol. The file format is a series of name-value pairs. Each key name should correspond to an address type that is currently installed on the system; there should also be an entry for each javax.mail.Address implementation that is present if it is to be used. For example, the javax.mail.internet.InternetAddress method getType returns "rfc822". Each referenced protocol should be installed on the system. For the case of news, below, the client should install a Transport provider supporting the nntp protocol. Here are the typical contents of a javamail.address.map file: rfc822=smtp news=nntp See Also (auto-generated):Transport




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