Fixed dev time compilation using J9+ producing incorrect bytecode.

src/main/java/net/minecraftforge/client/ForgeHooksClient.java

@@ -39,6 +39,7 @@ import static org.lwjgl.opengl.GL20.glVertexAttribPointer;
 
 import java.io.File;
 import java.lang.reflect.Field;
+import java.nio.Buffer;
 import java.nio.ByteBuffer;
 import java.util.ArrayList;
 import java.util.List;
@@ -431,7 +432,7 @@ public class ForgeHooksClient
         VertexFormatElement attr = format.getElements().get(element);
         int count = attr.getElementCount();
         int constant = attr.getType().getGlConstant();
-        buffer.position(format.getOffset(element));
+        ((Buffer)buffer).position(format.getOffset(element));
         switch(attrType)
         {
             case POSITION:

src/main/java/net/minecraftforge/client/extensions/IForgeVertexBuilder.java

@@ -34,6 +34,7 @@ import net.minecraftforge.client.model.pipeline.LightUtil;
 
 import org.lwjgl.system.MemoryStack;
 
+import java.nio.Buffer;
 import java.nio.ByteBuffer;
 import java.nio.IntBuffer;
 
@@ -71,7 +72,7 @@ public interface IForgeVertexBuilder
             IntBuffer intbuffer = bytebuffer.asIntBuffer();
 
             for(int v = 0; v < vertexCount; ++v) {
-                intbuffer.clear();
+                ((Buffer)intbuffer).clear();
                 intbuffer.put(aint, v * 8, 8);
                 float f = bytebuffer.getFloat(0);
                 float f1 = bytebuffer.getFloat(4);
@@ -106,7 +107,7 @@ public interface IForgeVertexBuilder
             }
         }
     }
-    
+
     default int applyBakedLighting(int lightmapCoord, ByteBuffer data) {
         int bl = LightTexture.getLightBlock(lightmapCoord);
         int sl = LightTexture.getLightSky(lightmapCoord);
@@ -117,7 +118,7 @@ public interface IForgeVertexBuilder
         sl = Math.max(sl, slBaked);
         return LightTexture.packLight(bl, sl);
     }
-    
+
     default void applyBakedNormals(Vector3f generated, ByteBuffer data, Matrix3f normalTransform) {
         byte nx = data.get(28);
         byte ny = data.get(29);

src/main/java/net/minecraftforge/client/model/b3d/B3DModel.java

@@ -22,6 +22,7 @@ package net.minecraftforge.client.model.b3d;
 import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.nio.Buffer;
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 import java.nio.channels.FileChannel;
@@ -41,7 +42,6 @@ import javax.annotation.Nullable;
 import net.minecraft.client.renderer.*;
 import net.minecraft.util.math.Vec2f;
 import net.minecraftforge.versions.forge.ForgeVersion;
-import net.minecraftforge.common.model.TransformationHelper;
 import org.apache.commons.io.IOUtils;
 import org.apache.commons.lang3.tuple.Pair;
 import org.apache.commons.lang3.tuple.Triple;
@@ -100,11 +100,11 @@ public class B3DModel
                 int l = ByteBuffer.wrap(tmp).order(ByteOrder.LITTLE_ENDIAN).getInt();
                 if(l < 0 || l + 8 < 0) throw new IOException("File is too large");
                 buf = ByteBuffer.allocate(l + 8).order(ByteOrder.LITTLE_ENDIAN);
-                buf.clear();
+                ((Buffer)buf).clear();
                 buf.put(tag);
                 buf.put(tmp);
                 buf.put(IOUtils.toByteArray(in, l));
-                buf.flip();
+                ((Buffer)buf).flip();
             }
         }
 
@@ -193,7 +193,7 @@ public class B3DModel
             while(buf.get() != 0);
             int end = buf.position();
             byte[] tmp = new byte[end - start - 1];
-            buf.position(start);
+            ((Buffer)buf).position(start);
             buf.get(tmp);
             buf.get();
             return new String(tmp, "UTF8");
@@ -204,12 +204,12 @@ public class B3DModel
         private void pushLimit()
         {
             limitStack.push(buf.limit());
-            buf.limit(buf.position() + length);
+            ((Buffer)buf).limit(buf.position() + length);
         }
 
         private void popLimit()
         {
-            buf.limit(limitStack.pop());
+            ((Buffer)buf).limit(limitStack.pop());
         }
 
         private B3DModel bb3d() throws IOException
@@ -501,7 +501,7 @@ public class B3DModel
 
         private void skip()
         {
-            buf.position(buf.position() + length);
+            ((Buffer)buf).position(buf.position() + length);
         }
     }