search

TimefoldAI / timefold-solver-python

Timefold Solver is an AI constraint solver for Python to optimize the Vehicle Routing Problem, Employee Rostering, Maintenance Scheduling, Task Assignment, School Timetabling, Cloud Optimization, Conference Scheduling, Job Shop Scheduling, Bin Packing and many more planning problems.
https://timefold.ai
Apache License 2.0
25 stars 3 forks source link

If the JVM version is too low, show a simple, clean error message #104

Open ge0ffrey opened 2 days ago

ge0ffrey commented 2 days ago

To reproduce:

sdk java use 11.2.3-tem (or whatever is the latest today)
cd school-timetabling
mvn quarkus:dev

Result:

File "org.jpype.pkg.JPypePackage.java", line -1, in org.jpype.pkg.JPypePackage.getObject
Exception: Java Exception

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
 File "org.jpype.pkg.JPypePackage.java", line -1, in org.jpype.pkg.JPypePackage.getObject
java.lang.java.lang.UnsupportedClassVersionError: java.lang.UnsupportedClassVersionError: ai/timefold/jpyinterpreter/CPythonBackedPythonInterpreter has been compiled by a more recent version of the Java Runtime (class file version 61.0), this version of the Java Runtime only recognizes class file versions up to 52.0
... man more lines

Desired, something like (feel free to adjust):

Timefold Solver for Python requires JVM (java) version 17 or later. Your JVM version (11.2.3) is not supported.
Maybe use sdkman (https://sdkman.io) to install a more modern version of Java.
ge0ffrey commented 2 days ago

Similarly, if no java is installed at all, it should output something like:

Timefold Solver for Python requires JVM (java) version 17 or later. You have none installed.
Maybe use sdkman (https://sdkman.io) to install a modern version of Java.