Confirmed jvmrun Constraint
An eWON device can run only one Java program through jvmrun. Adding two Java launch lines does not create two independent processes: the device executes only the first line.
Why the Two-Line Configuration Fails
The attempted configuration defines separate applications with the same heap-size setting but different classpaths:
-heapsize 1M -classpath /usr/FilesManagement.jar -emain MainClass
-heapsize 1M -classpath /usr/ModbusRTU.jar -emain MainClassThis arrangement is unsupported. The limitation also applies when one component acts as an IOServer and the other is an application; that role separation does not allow both Java programs to run independently.
Supported Resolution
Merge the two add-ons into one add-on and launch that single program from jvmrun. The combined program must incorporate both the file-management and Modbus RTU functions under one entry point.
- Combine both add-ons into one Java program.
- Define one entry point that initializes both required functions.
- Configure
jvmrunwith only the combined program's launch command. - Restart or launch the Java program, then verify that both functions operate from the single running add-on.
FAQ
Can eWON jvmrun start two Java applications?
No. eWON supports only one Java program through jvmrun, so only the first of two launch lines executes.
Can an IOServer and a Java application run separately on eWON?
No. Making one program an IOServer and the other an application does not bypass the single-program limitation.
How do I run FilesManagement.jar and ModbusRTU.jar together?
Merge both add-ons into one Java program with one entry point, configure a single jvmrun launch command, and verify that the combined program provides both functions.