Thread: java.lang.NullPointerException
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Unread 17-01-2017, 21:33
iterevo iterevo is offline
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FRC #0967 (Iron Lions)
Team Role: Programmer
  
Join Date: Jan 2017
Rookie Year: 2016
Location: Marion IA
Posts: 3
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java.lang.NullPointerException
We have been trying to figure out the new CAN Talon libraries given to us this season. After looking through numerous examples, we cannot get around this error:

Code:
ERROR  1  ERROR Unhandled exception: java.lang.NullPointerException at [org.usfirst.frc.team967.robot.subsystems.DriveSubsystem.arcadeDrive(DriveSubsystem.java:27), org.usfirst.frc.team967.robot.commands.TeleOp_ArcadeDrive.execute(TeleOp_ArcadeDrive.java:23), edu.wpi.first.wpilibj.command.Command.run(Command.java:243), edu.wpi.first.wpilibj.command.Scheduler.run(Scheduler.java:206), org.usfirst.frc.team967.robot.Robot.teleopPeriodic(Robot.java:109), edu.wpi.first.wpilibj.IterativeRobot.startCompetition(IterativeRobot.java:130), edu.wpi.first.wpilibj.RobotBase.main(RobotBase.java:247)]  edu.wpi.first.wpilibj.RobotBase.main(RobotBase.java:249) 
 Error at edu.wpi.first.wpilibj.RobotBase.main(RobotBase.java:249): ERROR Unhandled exception: java.lang.NullPointerException at [org.usfirst.frc.team967.robot.subsystems.DriveSubsystem.arcadeDrive(DriveSubsystem.java:27), org.usfirst.frc.team967.robot.commands.TeleOp_ArcadeDrive.execute(TeleOp_ArcadeDrive.java:23), edu.wpi.first.wpilibj.command.Command.run(Command.java:243), edu.wpi.first.wpilibj.command.Scheduler.run(Scheduler.java:206), org.usfirst.frc.team967.robot.Robot.teleopPeriodic(Robot.java:109), edu.wpi.first.wpilibj.IterativeRobot.startCompetition(IterativeRobot.java:130), edu.wpi.first.wpilibj.RobotBase.main(RobotBase.java:247)] 
 WARNING: Robots don't quit! 
 ---> The startCompetition() method (or methods called by it) should have handled the exception above. 
 ➔ Launching «'/usr/local/frc/JRE/bin/java' '-Djava.library.path=/usr/local/frc/lib/' '-jar' '/home/lvuser/FRCUserProgram.jar'» 
 ********** Robot program starting ********** 
 NT: server: client CONNECTED: 10.9.67.144 port 56534 
 Default IterativeRobot.robotPeriodic() method... Overload me!
Here is the link to our github to view all our code: https://github.com/FRC-IronLions-967/2017SteamWorks

The robot code will build and deploy correctly, and shows no errors. However when you enable the robot, the robot code drops out after a couple seconds and the above error appears.

Thanks,
Any help is appreciated
Team 967
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