Hello,

 

I want to use API of other mod, but I get error, even if I use it in a try.. I would like to make it work even without having that API mod. So should I check if player has this API mod, or is there some other better way?

 

            try {

                world.setBlockState(position), BlockBOPSapling.paging.getVariantState(BOPTrees.BAMBOO));

            } catch (NoClassDefFoundError e) {

                System.out.println(e);

            }

 

net.minecraftforge.fml.common.LoaderException: java.lang.NoClassDefFoundError: biomesoplenty/api/enums/BOPTrees

at net.minecraftforge.fml.common.LoadController.transition(LoadController.java:186)

at net.minecraftforge.fml.common.Loader.initializeMods(Loader.java:790)

at net.minecraftforge.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:322)

at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:520)

at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:351)

at net.minecraft.client.main.Main.main(SourceFile:124)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:483)

at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)

at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

Caused by: java.lang.NoClassDefFoundError: biomesoplenty/api/enums/BOPTrees

at mymode.core.EventHandler.<init>(EventHandler.java:20)

at mymode.core.Fauns.init(Fauns.java:34)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:483)

at net.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:595)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:483)

at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)

at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)

at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)

at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)

at com.google.common.eventbus.EventBus.post(EventBus.java:275)

at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:239)

at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:217)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:483)

at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)

at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)

at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)

at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)

at com.google.common.eventbus.EventBus.post(EventBus.java:275)

at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:142)

at net.minecraftforge.fml.common.Loader.initializeMods(Loader.java:788)

... 10 more

Caused by: java.lang.ClassNotFoundException: biomesoplenty.api.enums.BOPTrees

at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)

at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

... 39 more

Caused by: java.lang.NullPointerException

at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)

... 41 more

@Optional is part of the cpw.mods.fml.common.Optional package.  Eclipse isn't very good at being able to auto-import that particular annotation, usually because it requires a parameter and if you don't have it (because you don't know what it is) the package can't be determined.

 

I had a lot of trouble the first time I tried to use it.

Wait, what?  In my 1.10.2 workspace I don't have the cpw package at all, the only Optional I have is net.minecraftforge.fml.common.Optional

Wait, what?  In my 1.10.2 workspace I don't have the cpw package at all, the only Optional I have is net.minecraftforge.fml.common.Optional

 

Ah, it got moved, I forgot about that.  Sorry, last time I used it was 1.7.10

Had a real tough time locating the right package so I could see what it's usage parameters were!

Ah ok, so it's @Optional.Method(modid = "") then?

 

 

That's...very useful lol

Ok I simply made a new class with @Optional.Interface(iface = "package", modid = "MOD_ID") and everything is fine