版本信息
你使用的系统：Deepin15.11 x64
你是用的JDK: JDK 1.8.0_252
你使用的IDE：IntelliJ IDEA
你使用的IDE版本: 2020.1.2
Forge版本: Forge 31.2.0-1.15.2
Minecraft版本: 1.15.2
Mapping 文件版本:20200717-1.15.1
出错图
错误情况简述
我想在MC中加入柠檬树，但是在指定原木和树叶后，启动游戏却报空指针。（错误的代码详见相关代码的注释）
一开始是报TreeFeatureConfig这一段代码有问题，我便将LOG换成Blocks.BIRCH_LOG.getDefaultState()，LEAVES换成Blocks.BIRCH_LEAVES.getDefaultState()后（即将原木换成白桦木，树叶换成白桦叶），却正常运行。
后来我查明，主要是getDefaultState()的问题，把LOG和LEAVES换成MC原版的任何方块都没有问题，但换成我自己MOD的方块就会出问题。一开始我认为只是方块没有setDefaultState而已，但我在方块的代码里加入setDefaultState()之后还是会出现问题。
在我之前1.12.2的开发中也遇到过类似问题，但我现在不知道如何解决。
相关代码(仅关键代码)
LemonTree.java
private static final BlockState LOG = RegisterLoader.blockLemonLog.getDefaultState(); // 出错的代码
private static final BlockState LEAVES = RegisterLoader.blockLemonLeaf.getDefaultState(); // 出错的代码
public static final TreeFeatureConfig CONFIG = (new TreeFeatureConfig.Builder(new SimpleBlockStateProvider(LOG), // 指定原木
new SimpleBlockStateProvider(LEAVES), // 指定叶子
new BlobFoliagePlacer(2, 0)))
.baseHeight(5)
.heightRandA(2)
.foliageHeight(3)
.ignoreVines()
.setSapling((IPlantable) RegisterLoader.blockLemonSapling)
.build();
报错日志(仅关键信息)
[23:05:59] [modloading-worker-3/ERROR] [ne.mi.fm.ja.FMLModContainer/LOADING]: Failed to register automatic subscribers. ModID: hamburger, class bilibili.vvvbbbcz.hamburger.Hamburger
java.lang.ExceptionInInitializerError: null
at bilibili.vvvbbbcz.hamburger.blocks.BlockLemonSapling.<init>(BlockLemonSapling.java:17) ~[?:?] {re:classloading}
at bilibili.vvvbbbcz.hamburger.loaders.RegisterLoader.<clinit>(RegisterLoader.java:27) ~[?:?] {re:classloading}
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_252] {}
at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_252] {}
at net.minecraftforge.fml.AutomaticEventSubscriber.lambda$inject$6(AutomaticEventSubscriber.java:75) ~[?:?] {re:classloading}
at java.util.ArrayList.forEach(ArrayList.java:1257) ~[?:1.8.0_252] {}
at net.minecraftforge.fml.AutomaticEventSubscriber.inject(AutomaticEventSubscriber.java:62) ~[?:?] {re:classloading}
at net.minecraftforge.fml.javafmlmod.FMLModContainer.constructMod(FMLModContainer.java:141) ~[?:31.2] {re:classloading}
at java.util.function.Consumer.lambda$andThen$0(Consumer.java:65) ~[?:1.8.0_252] {}
at java.util.function.Consumer.lambda$andThen$0(Consumer.java:65) ~[?:1.8.0_252] {}
at net.minecraftforge.fml.ModContainer.transitionState(ModContainer.java:112) ~[?:?] {re:classloading}
at net.minecraftforge.fml.ModList.lambda$null$10(ModList.java:135) ~[?:?] {re:classloading}
at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) [?:1.8.0_252] {}
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1382) [?:1.8.0_252] {}
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482) [?:1.8.0_252] {}
at java.util.stream.ForEachOps$ForEachTask.compute(ForEachOps.java:290) [?:1.8.0_252] {}
at java.util.concurrent.CountedCompleter.exec(CountedCompleter.java:731) [?:1.8.0_252] {}
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) [?:1.8.0_252] {}
at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056) [?:1.8.0_252] {}
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692) [?:1.8.0_252] {}
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157) [?:1.8.0_252] {}
Caused by: java.lang.NullPointerException
at bilibili.vvvbbbcz.hamburger.blocks.trees.LemonTree.<clinit>(LemonTree.java:18) ~[?:?] {re:classloading}
... 21 more
查到的资料
neutrino的教程(我认为这并无卵用)