Newer the phone, more strange the bug. The following is a bug affecting some Series60 devices (3rd FP1, 3rd FP2 and 5th): Nokia E71, Nokia N79, Nokia N96, Nokia 5800 XpressMusic.

The withespace characters before and after JAD attributes should be ignored according to MIDP specifications but if user tries to install an application with a whitespace character after the last JAD attribute on one of the mentioned decvies he will get a "Compulsory attributes missing".

So, be sure to remove whitespace chars from your JAD!

Despite the '\n' can be used in any string in J2ME applications, with S60 Editions up till S60 3rd Edition, Feature Pack 1, the new line is not inserted properly in the Alert and the message remains in the same line (at least until it fits in the alert width).

The issue has been fixed starting from S60 3rd Edition, Feature Pack 2.

Read more at the Forum Nokia Wiki

On 9 March Nokia released the version 1.2 of Energy profiler a Symbian application you can use to monitor how the power consumption of your phone changes when you try a J2ME application (or other type of software).

As stated in the Nokia website:

"It is an application that enables developers and device users to examine power consumption and several other parameters on S60 devices. The reporting provided by the Nokia Energy Profiler enables developers to identify and improve application functions that consume excessive amounts of power and thus to create higher-quality applications."

The application works on Nokia series60 3rd and 5th edition devices.

The features added in the version 1.2 are:

• Touch UI support.
• Capture of WLAN received signal strength and 3G cellular network T1 and T2 timers.
• New graphing features.
• New CSV output features.

If you try to show a string which contain both a mix of characters from right align (Arabic or Hebrew for example) and left align alphabet (e.g. English or France),  the visualization won't be correct.

To fix the problem, developers must add an extra character called right-to-left mark (U+200F) in their midlet's code.

Example:

abc\u0626\u0624\u0625\u0625\u0625\u0625\n

should become

\u200Fabc\u0626\u0624\u0625\u0625\u0625\u0625\n

Nokia Forum claims this bug affects J2ME implementation of Series 40 but I've found the same behavior on some Serie 60 and on the Series60 3rd edition FP1 emulator.

Link to the Forum Nokia: click to see more

I've found this interesting article from the wiki of Forum Nokia describing a library to query Google Maps to geocode addresses to their geographic coordinates and to retrieve static images with custom size, zoom and format.

The article is complete with source code and shows also an utility to scroll the map you get from Google

Go to the article clicking J2ME Google Maps API

Also Nokia has implemented its own touchscreen UI (as well as IPhone and Google Android example).

Here a video showing the feature of the Series 60 touch interface running on a prototype phone: