解决空指针问题

gradle.properties

@@ -1,9 +1,9 @@
-modName = MyMod
+modName = ReplayModFixMod
 
 # This is a case-sensitive string to identify your mod. Convention is to use lower case.
-modId = mymodid
+modId = replaymodfixmod
 
-modGroup = com.myname.mymodid
+modGroup = com.github.wohaopa.replaymodfixmod
 
 # WHY is there no version field?
 # The build script relies on git to provide a version via tags. It is super easy and will enable you to always know the
@@ -37,11 +37,11 @@ enableModernJavaSyntax = true
 enableGenericInjection = false
 
 # Generate a class with String fields for the mod id, name, version and group name named with the fields below
-generateGradleTokenClass = com.myname.mymodid.Tags
-gradleTokenModId = MODID
-gradleTokenModName = MODNAME
-gradleTokenVersion = VERSION
-gradleTokenGroupName = GROUPNAME
+generateGradleTokenClass =
+gradleTokenModId =
+gradleTokenModName =
+gradleTokenVersion =
+gradleTokenGroupName =
 # [DEPRECATED]
 # Multiple source files can be defined here by providing a comma-seperated list: Class1.java,Class2.java,Class3.java
 # public static final String VERSION = "GRADLETOKEN_VERSION";
@@ -57,23 +57,23 @@ apiPackage =
 
 # Specify the configuration file for Forge's access transformers here. It must be placed into /src/main/resources/META-INF/
 # Example value: mymodid_at.cfg
-accessTransformersFile =
+accessTransformersFile = replaymodfixmod_at.cfg
 
 # Provides setup for Mixins if enabled. If you don't know what mixins are: Keep it disabled!
-usesMixins = false
+usesMixins = true
 # Adds some debug arguments like verbose output and export
 usesMixinDebug = false
 # Specify the location of your implementation of IMixinConfigPlugin. Leave it empty otherwise.
-mixinPlugin =
+mixinPlugin = MixinPlugin
 # Specify the package that contains all of your Mixins. You may only place Mixins in this package or the build will fail!
-mixinsPackage =
+mixinsPackage = mixins
 # Specify the core mod entry class if you use a core mod. This class must implement IFMLLoadingPlugin!
 # This parameter is for legacy compatibility only
 # Example value: coreModClass = asm.FMLPlugin + modGroup = com.myname.mymodid -> com.myname.mymodid.asm.FMLPlugin
 coreModClass =
 # If your project is only a consolidation of mixins or a core mod and does NOT contain a 'normal' mod ( = some class
 # that is annotated with @Mod) you want this to be true. When in doubt: leave it on false!
-containsMixinsAndOrCoreModOnly = false
+containsMixinsAndOrCoreModOnly = true
 
 # Enables Mixins even if this mod doesn't use them, useful if one of the dependencies uses mixins.
 forceEnableMixins = false

src/main/java/com/github/wohaopa/replaymodfixmod/MixinPlugin.java

@@ -0,0 +1,51 @@
+package com.github.wohaopa.replaymodfixmod;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Set;
+
+import org.spongepowered.asm.mixin.extensibility.IMixinConfigPlugin;
+import org.spongepowered.asm.mixin.extensibility.IMixinInfo;
+import org.spongepowered.libraries.org.objectweb.asm.tree.ClassNode;
+
+import cpw.mods.fml.relauncher.FMLLaunchHandler;
+
+public class MixinPlugin implements IMixinConfigPlugin {
+
+    @Override
+    public void onLoad(String mixinPackage) {
+
+    }
+
+    @Override
+    public String getRefMapperConfig() {
+        return null;
+    }
+
+    @Override
+    public boolean shouldApplyMixin(String targetClassName, String mixinClassName) {
+        return false;
+    }
+
+    @Override
+    public void acceptTargets(Set<String> myTargets, Set<String> otherTargets) {
+
+    }
+
+    @Override
+    public List<String> getMixins() {
+        List<String> mixins = new ArrayList<>();
+        if (FMLLaunchHandler.side().isClient()) mixins.add("NetHandlerPlayClientMixin");
+        return mixins;
+    }
+
+    @Override
+    public void preApply(String s, ClassNode classNode, String s1, IMixinInfo iMixinInfo) {
+
+    }
+
+    @Override
+    public void postApply(String s, ClassNode classNode, String s1, IMixinInfo iMixinInfo) {
+
+    }
+}

src/main/java/com/github/wohaopa/replaymodfixmod/ReplayModFixMod.java

@@ -0,0 +1,23 @@
+package com.github.wohaopa.replaymodfixmod;
+
+import java.util.logging.LogManager;
+import java.util.logging.Logger;
+
+import cpw.mods.fml.common.Mod;
+
+@Mod(
+        modid = ReplayModFixMod.MODID,
+        name = ReplayModFixMod.NAME,
+        version = ReplayModFixMod.VERSION,
+        dependencies = "required-after:spongemixins;")
+public class ReplayModFixMod {
+
+    public static final Logger LOG = LogManager.getLogManager().getLogger("ReplayModFixMod");
+
+    public static final String MODID = "replaymodfixmod";
+    public static final String NAME = "ReplayMod Fix Mod";
+    public static final String VERSION = "1.0.1";
+    @Mod.Instance(MODID)
+    public static ReplayModFixMod instance;
+
+}

src/main/java/com/github/wohaopa/replaymodfixmod/mixins/NetHandlerPlayClientMixin.java

@@ -0,0 +1,23 @@
+package com.github.wohaopa.replaymodfixmod.mixins;
+
+import net.minecraft.client.network.NetHandlerPlayClient;
+import net.minecraft.network.play.server.S0CPacketSpawnPlayer;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(NetHandlerPlayClient.class)
+public abstract class NetHandlerPlayClientMixin {
+
+    @Inject(method = "handleSpawnPlayer", at = @At("HEAD"), cancellable = true)
+    public void inject(S0CPacketSpawnPlayer p_147237_1_, CallbackInfo ci) {
+        if (((NetHandlerPlayClient) (Object) this).gameController.theWorld == null
+                || p_147237_1_.func_148948_e() == null) {
+            ci.cancel();
+            System.out.println("Wrong packet: " + p_147237_1_);
+        }
+        System.out.println("ReplayModFixMod injected!");
+    }
+}

src/main/resources/META-INF/replaymodfixmod_at.cfg

@@ -0,0 +1 @@
+public net.minecraft.client.network.NetHandlerPlayClient field_147299_f #gameController