java.lang.ClassNotFoundExeption error

Technical Programming
1

  • ********** Robot program starting **********

  • NT: server: client CONNECTED: 10.15.95.227 port 53280

  • navX-Sensor Java library for FRC

  • navX-Sensor Connected.

  • navX-Sensor onboard startup calibration complete.

  • navX-Sensor Yaw angle auto-reset to 0.0 due to startup calibration.

  • Unhandled exception: java.lang.ClassNotFoundException: edu.wpi.first.wpiutil.RuntimeLoader

  • Error at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(Unknown Source): Unhandled exception: java.lang.ClassNotFoundException: edu.wpi.first.wpiutil.RuntimeLoader

  • at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(Unknown Source)

  • at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(Unknown Source)

  • at java.base/java.lang.ClassLoader.loadClass(Unknown Source)

  • at com.revrobotics.jni.RevJNIWrapper.(RevJNIWrapper.java:42)

  • at com.revrobotics.CANSparkMaxLowLevel.(CANSparkMaxLowLevel.java:38)

  • at frc.robot.subsystems.ShooterSubsystem.(ShooterSubsystem.java:17)

  • at frc.robot.RobotContainer.(RobotContainer.java:35)

  • at frc.robot.Robot.robotInit(Robot.java:30)

  • at edu.wpi.first.wpilibj.TimedRobot.startCompetition(TimedRobot.java:107)

  • at edu.wpi.first.wpilibj.RobotBase.runRobot(RobotBase.java:373)

  • at edu.wpi.first.wpilibj.RobotBase.startRobot(RobotBase.java:463)

  • at frc.robot.Main.main(Main.java:23)

  • The robot program quit unexpectedly. This is usually due to a code error.
    The above stacktrace can help determine where the error occurred.
    See https://wpilib.org/stacktrace for more information.

from: edu.wpi.first.wpilibj.RobotBase.runRobot(RobotBase.java:388)

  • Warning at edu.wpi.first.wpilibj.RobotBase.runRobot(RobotBase.java:388): The robot program quit unexpectedly. This is usually due to a code error.

  • The startCompetition() method (or methods called by it) should have handled the exception above.

  • The above stacktrace can help determine where the error occurred.

  • See https://wpilib.org/stacktrace for more information.

  • Error at edu.wpi.first.wpilibj.RobotBase.runRobot(RobotBase.java:395): The startCompetition() method (or methods called by it) should have handled the exception above.

  • [phoenix-diagnostics] Server shutdown cleanly. (dur:10|0)

  • [phoenix] Library shutdown cleanly

  • [phoenix-diagnostics] Server shutdown cleanly. (dur:10|0)

then it goes to this after a little:

  • ********** Robot program starting **********

  • NT: server: client CONNECTED: 10.15.95.227 port 53290

  • navX-Sensor Java library for FRC

  • navX-Sensor Connected.

  • navX-Sensor Board Type 50 (navX-MXP (Classic))

  • navX-Sensor firmware version 3.0

  • navX-Sensor onboard startup calibration complete.

  • navX-Sensor Yaw angle auto-reset to 0.0 due to startup calibration.

  • CTR: No new response to update signal

  • CTR: No new response to update signal

  • Unhandled exception: java.lang.RuntimeException: Failed to configure Falcon 500 settings: SigNotUpdated

  • Error at com.swervedrivespecialties.swervelib.ctre.CtreUtils.checkCtreError(CtreUtils.java:11): Unhandled exception: java.lang.RuntimeException: Failed to configure Falcon 500 settings: SigNotUpdated

  • at com.swervedrivespecialties.swervelib.ctre.CtreUtils.checkCtreError(CtreUtils.java:11)

  • at com.swervedrivespecialties.swervelib.ctre.Falcon500SteerControllerFactoryBuilder$FactoryImplementation.create(Falcon500SteerControllerFactoryBuilder.java:119)

  • at com.swervedrivespecialties.swervelib.ctre.Falcon500SteerControllerFactoryBuilder$FactoryImplementation.create(Falcon500SteerControllerFactoryBuilder.java:74)

  • at com.swervedrivespecialties.swervelib.SteerControllerFactory.create(SteerControllerFactory.java:20)

  • at com.swervedrivespecialties.swervelib.SwerveModuleFactory.create(SwerveModuleFactory.java:32)

  • The robot program quit unexpectedly. This is usually due to a code error.
    The above stacktrace can help determine where the error occurred.
    See https://wpilib.org/stacktrace for more information.

  • at com.swervedrivespecialties.swervelib.Mk4SwerveModuleHelper.createFalcon500(Mk4SwerveModuleHelper.java:73)

  • at com.swervedrivespecialties.swervelib.Mk4SwerveModuleHelper.createFalcon500(Mk4SwerveModuleHelper.java:103)

  • The startCompetition() method (or methods called by it) should have handled the exception above.

I think I have all of the right vendordep and they are all updated. Whats going on?

2

Please share your code, ideally via github (or similar) link. Please also make sure it includes the build.gradle file and vendordeps directory

3

I suspect one or more of your vendordep s hasn’t been updated for 2022.

5

I don’t know what’s wrong

6

You need to replace the Spark max vendor library with RevLib.

Delete RevRobotics.json from your vendordeps folder and replace it with this:

https://software-metadata.revrobotics.com/REVLib.json

1 Like
7

Ive tried to do that but ever time i do it gives me this message

image
image1358Ă—409 16.5 KB

8

Your school’s network may be blocking it.

You can also try the offline instructions
https://docs.revrobotics.com/sparkmax/software-resources/spark-max-api-information#c++-and-java

9

Im on my home network rn and its still there so i did it offline. I did this yesterday when I was at school and even with the new vendorDep, it still was throwing the same error…

10

Okay since you are using SDS I know that the library for them contains REV and CTRE libraries I believe. I had the exact problem and here is my thread . The link is from the wpi dev toward the bottom.

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