The Optional.Method annotation seems to not work in dev-env in some cases... trying to work around that to fix absence of FMP and Waila related crashes in dev-env.

src/main/scala/li/cil/oc/common/EventHandler.scala

@@ -30,38 +30,46 @@ import scala.collection.mutable
 object EventHandler extends ITickHandler with IConnectionHandler with ICraftingHandler {
   val pending = mutable.Buffer.empty[() => Unit]
 
-  def schedule(tileEntity: TileEntity) =
+  def schedule(tileEntity: TileEntity) {
     if (FMLCommonHandler.instance.getEffectiveSide.isServer) pending.synchronized {
       pending += (() => Network.joinOrCreateNetwork(tileEntity))
     }
+  }
 
   @Optional.Method(modid = "ForgeMultipart")
-  def schedule(part: TMultiPart) =
+  def schedule(tileEntity: () => TileEntity) {
     if (FMLCommonHandler.instance.getEffectiveSide.isServer) pending.synchronized {
-      pending += (() => Network.joinOrCreateNetwork(part.tile))
+      pending += (() => Network.joinOrCreateNetwork(tileEntity()))
     }
-
-  @Optional.Method(modid = "IC2")
-  def scheduleIC2Add(tileEntity: power.IndustrialCraft2) = if (FMLCommonHandler.instance.getEffectiveSide.isServer) pending.synchronized {
-    pending += (() => if (!tileEntity.addedToPowerGrid && !tileEntity.isInvalid) {
-      MinecraftForge.EVENT_BUS.post(new EnergyTileLoadEvent(tileEntity))
-      tileEntity.addedToPowerGrid = true
-    })
   }
 
   @Optional.Method(modid = "IC2")
-  def scheduleIC2Remove(tileEntity: power.IndustrialCraft2) = if (FMLCommonHandler.instance.getEffectiveSide.isServer) pending.synchronized {
-    pending += (() => if (tileEntity.addedToPowerGrid) {
-      MinecraftForge.EVENT_BUS.post(new EnergyTileUnloadEvent(tileEntity))
-      tileEntity.addedToPowerGrid = false
-    })
+  def scheduleIC2Add(tileEntity: power.IndustrialCraft2) {
+    if (FMLCommonHandler.instance.getEffectiveSide.isServer) pending.synchronized {
+      pending += (() => if (!tileEntity.addedToPowerGrid && !tileEntity.isInvalid) {
+        MinecraftForge.EVENT_BUS.post(new EnergyTileLoadEvent(tileEntity))
+        tileEntity.addedToPowerGrid = true
+      })
+    }
   }
 
-  def scheduleWirelessRedstone(rs: server.component.RedstoneWireless) = if (FMLCommonHandler.instance.getEffectiveSide.isServer) pending.synchronized {
-    pending += (() => if (!rs.owner.isInvalid) {
-      mods.WirelessRedstone.addReceiver(rs)
-      mods.WirelessRedstone.updateOutput(rs)
-    })
+  @Optional.Method(modid = "IC2")
+  def scheduleIC2Remove(tileEntity: power.IndustrialCraft2) {
+    if (FMLCommonHandler.instance.getEffectiveSide.isServer) pending.synchronized {
+      pending += (() => if (tileEntity.addedToPowerGrid) {
+        MinecraftForge.EVENT_BUS.post(new EnergyTileUnloadEvent(tileEntity))
+        tileEntity.addedToPowerGrid = false
+      })
+    }
+  }
+
+  def scheduleWirelessRedstone(rs: server.component.RedstoneWireless) {
+    if (FMLCommonHandler.instance.getEffectiveSide.isServer) pending.synchronized {
+      pending += (() => if (!rs.owner.isInvalid) {
+        mods.WirelessRedstone.addReceiver(rs)
+        mods.WirelessRedstone.updateOutput(rs)
+      })
+    }
   }
 
   override def getLabel = "OpenComputers Network Initialization Ticker"

src/main/scala/li/cil/oc/common/multipart/CablePart.scala

@@ -43,7 +43,7 @@ class CablePart(val original: Option[Node] = None) extends DelegatePart with TCu
 
   override def onWorldJoin() {
     super.onWorldJoin()
-    common.EventHandler.schedule(this)
+    common.EventHandler.schedule(() => tile)
   }
 
   override def onWorldSeparate() {

src/main/scala/li/cil/oc/common/tileentity/Rack.scala

@@ -8,7 +8,7 @@ import li.cil.oc.api.network.{Analyzable, Connector, Node, Visibility}
 import li.cil.oc.client.Sound
 import li.cil.oc.server.{component, driver, PacketSender => ServerPacketSender}
 import li.cil.oc.util.ExtendedNBT._
-import li.cil.oc.util.mods.Waila
+import li.cil.oc.util.mods.{Mods, Waila}
 import li.cil.oc.{Localization, Settings, api, common}
 import net.minecraft.entity.player.EntityPlayer
 import net.minecraft.item.ItemStack
@@ -261,7 +261,7 @@ class Rack extends traits.PowerAcceptor with traits.Hub with traits.PowerBalance
 
   // Side check for Waila (and other mods that may call this client side).
   override def writeToNBT(nbt: NBTTagCompound) = if (isServer) {
-    if (!Waila.isSavingForTooltip) {
+    if (!Mods.Waila.isAvailable || !Waila.isSavingForTooltip) {
       nbt.setNewTagList(Settings.namespace + "servers", servers map {
         case Some(server) =>
           val serverNbt = new NBTTagCompound()

src/main/scala/li/cil/oc/common/tileentity/traits/Computer.scala

@@ -9,7 +9,7 @@ import li.cil.oc.client.Sound
 import li.cil.oc.common.tileentity.RobotProxy
 import li.cil.oc.server.{driver, PacketSender => ServerPacketSender}
 import li.cil.oc.util.ExtendedNBT._
-import li.cil.oc.util.mods.Waila
+import li.cil.oc.util.mods.{Mods, Waila}
 import li.cil.oc.{Localization, Settings}
 import net.minecraft.entity.player.EntityPlayer
 import net.minecraft.nbt.{NBTTagCompound, NBTTagString}
@@ -148,7 +148,7 @@ trait Computer extends Environment with ComponentInventory with Rotatable with B
 
   override def writeToNBT(nbt: NBTTagCompound) {
     super.writeToNBT(nbt)
-    if (computer != null && !Waila.isSavingForTooltip) {
+    if (computer != null && (!Mods.Waila.isAvailable || !Waila.isSavingForTooltip)) {
       nbt.setNewCompoundTag(Settings.namespace + "computer", computer.save)
     }
   }

src/main/scala/li/cil/oc/util/mods/Mods.scala

@@ -36,6 +36,7 @@ object Mods {
   val ThermalExpansion = new SimpleMod("ThermalExpansion")
   val TinkersConstruct = new SimpleMod("TConstruct")
   val UniversalElectricity = new SimpleMod("UniversalElectricity@[3.1,)")
+  val Waila = new SimpleMod("Waila")
   val WirelessRedstoneCBE = new SimpleMod("WR-CBE|Core")
   val WirelessRedstoneSV = new SimpleMod("WirelessRedstoneCore")