Checking the JSR75 support of a midlet manager

This tutorial shows you how to check whether a midlet manager supports the Java standard JSR75 before installing the MobileSitter.


Background

JSR75 is a Java specification, which standardizes the access of J2ME midlets on the local file system. Some features of the MobileSitter, e.g. creating backup copies of stored secrets, require access to the local file system of the mobile device. Since the support of JSR75 is optional, however, there are a number of midlet managers which do not support this standard.


Identification

Midlet managers are provided by various third-party manufacturers. A midlet manager can be identified not only by the actual name but in most cases also by a version number and a build or publication date. But these data are not a guarantee for the support of JSR75. In the following two options of how to verify that the midlet manager supports JSR75 are presented.


Checking on basis of the About dialogue of the midlet managers

Notes on the support of Java standards often get displayed on the About dialogue of a midlet manager. The following example demonstrates how you can look at this screen with the midlet manager JBlend (v3.3.5, 20090727.5.1).

1. Start the midlet manager

2. Open the context menu by chosing Menu (German: Menü)

3. Chose the menu item About (German: Infos über..)

4. Supported JSR (German. Unterstützte JSR) holds a list of all JSRs supported by the midlet manager. The midlet manager supports the standard if the list contains the entry JSR75.



Java midlet to verify the compatibility of JSR75

For midlet managers which do not provide such information in an About dialogue we provide a free Java midlet which helps you to check at runtime whether JSR75 is supported.

The midlet to verify the JSR75 compatibility can be downloaded here:

 JSR75 Test Midlet (zip, 49kb)

Install the midlet on your mobile device. If you need help, see the installation instructions of the devices at The Devices. Then start the midlet and evaluate its output according to this:

If the midlet manager supports JSR75 the midlet will display Filesystem Access: OK. Additionally the version of the standard and all drives, which a midlet can access, will be listed.

If JSR75 is not supported by this midlet manager the test midlet displays the message Filesystem Access: Not Supported.