diff --git a/src/main/java/li/cil/oc/util/SideTracker.java b/src/main/java/li/cil/oc/util/SideTracker.java
new file mode 100644
index 000000000..6618e795f
--- /dev/null
+++ b/src/main/java/li/cil/oc/util/SideTracker.java
@@ -0,0 +1,22 @@
+package li.cil.oc.util;
+
+import cpw.mods.fml.common.FMLCommonHandler;
+
+import java.util.Collections;
+import java.util.Set;
+
+public final class SideTracker {
+    private static final Set<Thread> serverThreads = Collections.newSetFromMap(new java.util.WeakHashMap<Thread, Boolean>());
+
+    public static void addServerThread() {
+        serverThreads.add(Thread.currentThread());
+    }
+
+    public static boolean isServer() {
+        return FMLCommonHandler.instance().getEffectiveSide().isServer() || serverThreads.contains(Thread.currentThread());
+    }
+
+    public static boolean isClient() {
+        return !isServer();
+    }
+}
diff --git a/src/main/scala/li/cil/oc/util/SideTracker.scala b/src/main/scala/li/cil/oc/util/SideTracker.scala
deleted file mode 100644
index d9662869a..000000000
--- a/src/main/scala/li/cil/oc/util/SideTracker.scala
+++ /dev/null
@@ -1,15 +0,0 @@
-package li.cil.oc.util
-
-import java.util.Collections
-
-import cpw.mods.fml.common.FMLCommonHandler
-
-object SideTracker {
-  private val serverThreads = Collections.newSetFromMap(new java.util.WeakHashMap[Thread, java.lang.Boolean])
-
-  def addServerThread() = serverThreads.add(Thread.currentThread())
-
-  def isServer = FMLCommonHandler.instance.getEffectiveSide.isServer || serverThreads.contains(Thread.currentThread())
-
-  def isClient = !isServer
-}