loadFromFile not working

[joriswa]

I get this error

[18:33:19] [Server thread/WARN]: org.bitcoinj.wallet.UnreadableWalletException: Unknown network parameters ID org.dogecoin.production [18:33:19] [Server thread/WARN]: at org.bitcoinj.wallet.WalletProtobufSerializer.readWallet(WalletProtobufSerializer.java:416) [18:33:19] [Server thread/WARN]: at org.bitcoinj.wallet.WalletProtobufSerializer.readWallet(WalletProtobufSerializer.java:391) [18:33:19] [Server thread/WARN]: at org.bitcoinj.wallet.Wallet.loadFromFileStream(Wallet.java:1606) [18:33:19] [Server thread/WARN]: at org.bitcoinj.wallet.Wallet.loadFromFile(Wallet.java:1512) [18:33:19] [Server thread/WARN]: at net.waals.dogecraft.DogeCraft.onEnable(DogeCraft.java:29) [18:33:19] [Server thread/WARN]: at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263) [18:33:19] [Server thread/WARN]: at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:352) [18:33:19] [Server thread/WARN]: at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:417) [18:33:19] [Server thread/WARN]: at org.bukkit.craftbukkit.v1_15_R1.CraftServer.enablePlugin(CraftServer.java:462) [18:33:19] [Server thread/WARN]: at org.bukkit.craftbukkit.v1_15_R1.CraftServer.enablePlugins(CraftServer.java:376) [18:33:19] [Server thread/WARN]: at org.bukkit.craftbukkit.v1_15_R1.CraftServer.reload(CraftServer.java:811) [18:33:19] [Server thread/WARN]: at org.bukkit.Bukkit.reload(Bukkit.java:576) [18:33:19] [Server thread/WARN]: at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:27) [18:33:19] [Server thread/WARN]: at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:149) [18:33:19] [Server thread/WARN]: at org.bukkit.craftbukkit.v1_15_R1.CraftServer.dispatchCommand(CraftServer.java:711) [18:33:19] [Server thread/WARN]: at org.bukkit.craftbukkit.v1_15_R1.CraftServer.dispatchServerCommand(CraftServer.java:696) [18:33:19] [Server thread/WARN]: at net.minecraft.server.v1_15_R1.DedicatedServer.handleCommandQueue(DedicatedServer.java:436) [18:33:19] [Server thread/WARN]: at net.minecraft.server.v1_15_R1.DedicatedServer.b(DedicatedServer.java:400) [18:33:19] [Server thread/WARN]: at net.minecraft.server.v1_15_R1.MinecraftServer.a(MinecraftServer.java:984) [18:33:19] [Server thread/WARN]: at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:824) [18:33:19] [Server thread/WARN]: at java.base/java.lang.Thread.run(Thread.java:834)

[ygk44]

I guess I'm too late, but if anybody faces it again:
In BitcoinJ loadFromFile() and loadFromFileStream() use NetworkParameters.fromId() which is static. It's only aware of BTC IDs and thus returns null for all others.
The option I used is to create own instance of WalletProtobufSerializer and pass parameters inside directly:

try (InputStream in = new FileInputStream("yourFile")) {
    Protos.Wallet walletProto = WalletProtobufSerializer.parseToProto(in);
    WalletProtobufSerializer serializer = new WalletProtobufSerializer();
    Wallet yourWallet = serializer.readWallet(params, null, walletProto);
}