Jump to content
Search the Forums BEFORE making a new post.
Currently supported: All versions

Can getCapability throw, or must it return null?

josephcsible

By josephcsible
in Modder Support

 Share

Recommended Posts

josephcsible Tree Puncher

josephcsible

Posted
Posted (edited)

If hasCapability would return false for a given capability and facing, must getCapability return null for the same capability and facing, or may it throw an exception? Conversely, may you call getCapability and test for null instead of calling hasCapability?

Edited by josephcsible
Draco18s Reality Controller

Draco18s

Posted
Posted

I imagine that if you return false from has, then get won't even be called in most cases. In the rest, I imagine that the caller would perform a null check.

Apparently I'm a complete and utter jerk and come to this forum just like to make fun of people, be confrontational, and make your personal life miserable.  If you think this is the case, JUST REPORT ME.  Otherwise you're just going to get reported when you reply to my posts and point it out, because odds are, I was trying to be nice.

 

Exception: If you do not understand Java, I WILL NOT HELP YOU and your thread will get locked.

 

DO NOT PM ME WITH PROBLEMS. No help will be given.

Draco18s Reality Controller

Draco18s

Posted
Posted
7 hours ago, diesieben07 said:

If only we had Javadocs...

Oh yes, that definitely exists.

It doesn't answer the question, which was:

Would anything bad happen if the has/get contract is broken?

Obviously if you say "true" and return "null" then yes, but he's specifically asking for situations where has returns false.

 

The "do I need to call has or can I just check null?" question you and I talked about before.

Apparently I'm a complete and utter jerk and come to this forum just like to make fun of people, be confrontational, and make your personal life miserable.  If you think this is the case, JUST REPORT ME.  Otherwise you're just going to get reported when you reply to my posts and point it out, because odds are, I was trying to be nice.

 

Exception: If you do not understand Java, I WILL NOT HELP YOU and your thread will get locked.

 

DO NOT PM ME WITH PROBLEMS. No help will be given.

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Unfortunately, your content contains terms that we do not allow. Please edit your content to remove the highlighted words below.
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
 Share
Go to topic listing

Announcements



  • Recently Browsing

    • No registered users viewing this page.

  • Posts

    • TileEntity
      I cannot allocate more ram

      By TileEntity · Posted

      joptsimple.UnrecognizedOptionException: X is not a recognized option JVM-Arguments begin with a - So use -Xmx6G instead of Xmx6G etc
    • TileEntity
      server not working with Modlist not working even when using server pack creator

      By TileEntity · Posted

      Remove dynamiccrosshair from your server
    • LeightonkUK
      server not working with Modlist not working even when using server pack creator

      By LeightonkUK · Posted

      https://pastebin.com/SnWukPj8   thats the crash log if anyone can help add me on discord: privatelk
    • TileEntity
      Need help with minecraft server

      By TileEntity · Posted

      Remove Neruina and justleveling from your server
    • C24Hocker
      I cannot allocate more ram

      By C24Hocker · Posted

      I'm attempting to make a 1.20.1-47.4.0 forge server but when I change the user_jvm_args.txt it does nothing so i tried adding it to the run.bat which it picks up on the startup console but then gives me this [21:56:01] [main/ERROR] [minecraft/Main]: Failed to start the minecraft server joptsimple.UnrecognizedOptionException: X is not a recognized option     at joptsimple.OptionException.unrecognizedOption(OptionException.java:108) ~[jopt-simple-5.0.4.jar%2393!/:?] {}     at joptsimple.OptionParser.validateOptionCharacters(OptionParser.java:633) ~[jopt-simple-5.0.4.jar%2393!/:?] {}     at joptsimple.OptionParser.handleShortOptionCluster(OptionParser.java:528) ~[jopt-simple-5.0.4.jar%2393!/:?] {}     at joptsimple.OptionParser.handleShortOptionToken(OptionParser.java:523) ~[jopt-simple-5.0.4.jar%2393!/:?] {}     at joptsimple.OptionParserState$2.handleArgument(OptionParserState.java:59) ~[jopt-simple-5.0.4.jar%2393!/:?] {}     at joptsimple.OptionParser.parse(OptionParser.java:396) ~[jopt-simple-5.0.4.jar%2393!/:?] {}     at net.minecraft.server.Main.main(Main.java:98) ~[server-1.20.1-20230612.114412-srg.jar%23101!/:?] {re:classloading}     at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?] {}     at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?] {}     at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?] {}     at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?] {}     at net.minecraftforge.fml.loading.targets.CommonLaunchHandler.runTarget(CommonLaunchHandler.java:111) ~[fmlloader-1.20.1-47.4.0.jar%2369!/:?] {}     at net.minecraftforge.fml.loading.targets.CommonLaunchHandler.serverService(CommonLaunchHandler.java:103) ~[fmlloader-1.20.1-47.4.0.jar%2369!/:?] {}     at net.minecraftforge.fml.loading.targets.CommonServerLaunchHandler.lambda$makeService$0(CommonServerLaunchHandler.java:27) ~[fmlloader-1.20.1-47.4.0.jar%2369!/:?] {}     at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:30) ~[modlauncher-10.0.9.jar%2355!/:?] {}     at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53) ~[modlauncher-10.0.9.jar%2355!/:?] {}     at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71) ~[modlauncher-10.0.9.jar%2355!/:?] {}     at cpw.mods.modlauncher.Launcher.run(Launcher.java:108) ~[modlauncher-10.0.9.jar%2355!/:?] {}     at cpw.mods.modlauncher.Launcher.main(Launcher.java:78) ~[modlauncher-10.0.9.jar%2355!/:?] {}     at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) ~[modlauncher-10.0.9.jar%2355!/:?] {}     at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) ~[modlauncher-10.0.9.jar%2355!/:?] {}     at cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:141) ~[bootstraplauncher-1.1.2.jar:?] {} I have uninstalled and reinstalled all my versions of java and tried deleting and restarting everything several times to no avail. I have no more ideas and would appreciate any assistance.

  • Topics

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.

  I accept