Converting JAR to VXP is a feasible process, and we've provided a comprehensive guide on how to do it using Java ME SDK. While online conversion tools and third-party software exist, using Java ME SDK ensures a more reliable and secure conversion process. Keep in mind that the conversion process might not always produce a working VXP file, and some apps may require additional modifications to work on mobile devices.
To get a VXP file from a JAR, you must run the JAR through a MIDP (Mobile Information Device Profile) to BREW bridge. The only reliable tool for this is the legacy combined with a custom script.
A programmer named Kraft created a batch script years ago. It uses a pre-processor to convert MIDP API calls into BREW API calls.
: A free tool that can wrap Java programs into VXP or EXE formats while letting you modify icons. convert jar to vxp link
If you are a developer and your goal is to reach a modern feature phone audience, ignore MRE/VXP entirely and target KaiOS.
For a reliable conversion, you can wrap the Java application inside an MRE C++ container using the official developer tools. Prerequisites
Because the underlying architectures of Java ME and MediaTek MRE are completely different, a standard feature phone cannot natively read a JAR file. It requires translation. Can You Directly Convert JAR to VXP Online? Converting JAR to VXP is a feasible process,
Honestly, converting JAR to VXP is a headache. Unless you are a developer, you will fail at the step.
Use the emulator's built-in file manager to locate and launch your .jar files.
Because the official MediaTek MRE portal is no longer active, users often find VXP files on community-driven hosting sites like Reverse Engineering Stack Exchange Summary Table Java ME (J2ME) MediaTek MRE Common Devices Classic Nokia, Sony Ericsson Nokia S30+, MediaTek feature phones Conversion Easy to ZIP Manual porting required Development C/C++ via MRE SDK To get a VXP file from a JAR,
AddType application/vnd.qualcomm.brew-app vxp AddType text/plain sig
files, as these are frequently malware or unwanted software rather than actual file converters. Informer Technologies, Inc. of a popular app for your device? JAR files in Java - GeeksforGeeks 7 Jan 2026 —
For developers, the only official way to create a VXP file is through the . If you have the source code of the original Java app, you can port it to C/C++ within the MRE environment to ensure full compatibility and performance. Critical Step: Signing Your VXP File