30 lines
1.5 KiB
Java
30 lines
1.5 KiB
Java
package dev.modzuozhi.mixin;
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import com.llamalad7.mixinextras.injector.wrapmethod.WrapMethod;
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import com.llamalad7.mixinextras.injector.wrapoperation.Operation;
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import net.minecraft.world.entity.Entity;
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import net.minecraft.world.level.block.Blocks;
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import net.minecraft.world.level.block.state.BlockState;
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import org.spongepowered.asm.mixin.Mixin;
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/**
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* 防御：{@code Entity.getInBlockState()} 空值兜底。
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* <p>
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* 罕见 NPE 根因：并行子任务线程上，{@code getInBlockState()} 读取实体所在位置方块状态时
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* 偶发返回 {@code null}（区块读路径的边缘竞态），随后该值被传给
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* {@code CommonHooks.isLivingOnLadder(state, ...)} 并直接 {@code state.isLadder(...)} → NPE
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* （日志：[FineGrain] 子任务异常 ... because "state" is null，50 分钟约 1 次，被屏障捕获不降级）。
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* <p>
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* 注意：{@code getInBlockState()} 定义在 {@link Entity}（父类）而非 {@code LivingEntity}，
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* 因此 {@code @WrapMethod} 必须目标 {@code Entity.class}（mixin 只包装目标类<b>声明</b>的方法）。
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* 这里对返回值做空值兜底（null → 空气方块），从根源上杜绝该路径的 NPE；正常情况零改动。
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*/
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@Mixin(Entity.class)
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public abstract class LivingEntityGetInBlockStateMixin {
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@WrapMethod(method = "getInBlockState")
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private BlockState modzuozhi_nullSafeInBlockState(Operation<BlockState> original) {
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BlockState state = original.call();
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return state == null ? Blocks.AIR.defaultBlockState() : state;
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}
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}
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