Start pre/1.21/1.21.2-rc2

versions/pre/1.21/1.21.2-rc2/config.json

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+{
+    "official": true,
+    "merge_patches": true,
+    "java_target": 21,
+    "encoding": "UTF-8",
+    "test_remap_official": false,
+    "fernflower": {
+        "version": "org.vineflower:vineflower:1.10.1",
+        "java_version": 21,
+        "args": ["--decompile-inner", "--remove-bridge", "--decompile-generics", "--ascii-strings", "--remove-synthetic", "--include-classpath", "--variable-renaming=jad", "--ignore-invalid-bytecode", "--bytecode-source-mapping", "--dump-code-lines", "--indent-string=    ", "--log-level=TRACE", "-cfg", "{libraries}", "{input}", "{output}"],
+        "jvmargs": ["-Xmx4G"]
+    },
+    "merge": {
+        "version": "net.neoforged:mergetool:2.0.3:fatjar",
+        "args": ["--client", "{client}", "--server", "{server}", "--ann", "{version}", "--output", "{output}", "--inject", "false"],
+        "jvmargs": []
+    },
+    "rename": {
+        "version": "net.neoforged:AutoRenamingTool:2.0.4:all",
+        "args": ["--input", "{input}", "--output", "{output}", "--map", "{mappings}", "--cfg", "{libraries}", "--ann-fix", "--ids-fix", "--src-fix", "--record-fix", "--unfinal-params"]
+    },
+    "bundler_extract_jar": {
+        "version": "net.neoforged.installertools:installertools:2.1.2:fatjar",
+        "args": ["--task", "bundler_extract", "--input", "{input}", "--output", "{output}", "--jar-only"]
+    },
+    "bundler_extract_libs": {
+        "version": "net.neoforged.installertools:installertools:2.1.2:fatjar",
+        "args": ["--task", "bundler_extract", "--input", "{input}", "--output", "{output}", "--libraries"]
+    },
+    "mergemap": {
+        "version": "net.neoforged.installertools:installertools:2.1.2:fatjar",
+        "args": ["--task", "MERGE_MAPPING", "--left", "{mappings}", "--right", "{official}", "--right-names", "right,left", "--classes", "--fields", "--methods", "--output", "{output}"]
+    },
+    "libraries": {
+        "client": ["com.google.code.findbugs:jsr305:3.0.2", "ca.weblite:java-objc-bridge:1.1", "org.jetbrains:annotations:26.0.1"],
+        "server": ["com.google.code.findbugs:jsr305:3.0.2", "org.jetbrains:annotations:26.0.1"],
+        "joined": ["com.google.code.findbugs:jsr305:3.0.2", "ca.weblite:java-objc-bridge:1.1", "net.neoforged:mergetool:2.0.3:api", "org.jetbrains:annotations:26.0.1"]
+    }
+}

versions/pre/1.21/1.21.2-rc2/inject/mcp/client/Start.java

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+package mcp.client;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.Arrays;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonParser;
+import net.minecraft.client.main.Main;
+
+public class Start
+{
+    public static void main(String[] args)
+    {
+        /*
+         * start minecraft game application
+         * --version is just used as 'launched version' in snoop data and is required
+         * Working directory is used as gameDir if not provided
+         */
+        String assets = null;
+        String assetIndex = "17";
+        try (InputStream assetsInput = Start.class.getClassLoader().getResourceAsStream("assets.json")) {
+            if (assetsInput != null) {
+                JsonElement element = JsonParser.parseReader(new InputStreamReader(assetsInput));
+                assets = element.getAsJsonObject().get("assets").getAsString();
+                assetIndex = element.getAsJsonObject().get("asset_index").getAsString();
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        if (assets == null) {
+            assets = System.getenv().containsKey("assetDirectory") ? System.getenv("assetDirectory") : "assets";
+        }
+        Main.main(concat(new String[] { "--version", "mcp", "--accessToken", "0", "--assetsDir", assets, "--assetIndex", assetIndex, "--userProperties", "{}" }, args));
+    }
+
+    public static <T> T[] concat(T[] first, T[] second)
+    {
+        T[] result = Arrays.copyOf(first, first.length + second.length);
+        System.arraycopy(second, 0, result, first.length, second.length);
+        return result;
+    }
+}