In today's Forums, romanz explains ME file access in Re: how to use file:// protocol to access directory. "To access anything in the device file system via file:// protocol, JSR-75 FileConnection is used. The JSR is able to restrict file system access, i.e. not show the entire directory structure to Java applications. Typically, the first thing a MIDlet should do before attempting to access any directory (after verifying that JSR-75 is present), is a call to javax.microedition.io.file.FileSystemRegistry.listRoots(), which tells what virtual file system roots are accessible to the application. For an example of FileConnection usage, you can check the FileBrowser MIDlet in PDAPDemo suite from Sun Java Wireless Toolkit (version 2.5.2 is available at http://java.sun.com/products/sjwtoolkit/download.html). For more details on the FileConnection API, please see the specification at http://www.jcp.org/en/jsr/detail?id=75"

kawaiimomo warns against willy-nilly use of System.gc() in ME apps, as explained in Re: Does system.gc() really help your app to get more efficient? "Any j2me experienced programmer/guru will tell you not to use gc() as the kvm is wise enough to know when it needs to call gc. In many MIDlets I've done I used System.gc() a lot, just in places such as after loading a big amount of images, data, or after performing any operation that would leave _a lot_ of objects that were ready to being collected. It will probably make the app slower, but you can avoid OutOfMemoryExceptions (for a larger period of time at least)."

denizoguz wants opinions on whether or not to use JMC on a real project. "We think to use JMC in a several million dolar project. In this project mpeg4 and telemetry data are contained in a transport stream. Java application will display elementary data on video and allow some operations like zoom, chaning contrast etc. on the video file. Target operating system is Windows. I know JMC is preview stage now but we have more than 6 months to complete the project and 1.0 release is very close. Do you think that it is risky?"

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