diff --git a/src/de/dhbwstuttgart/syntaxtree/statement/Expression.java b/src/de/dhbwstuttgart/syntaxtree/statement/Expression.java
index 4371bdc1..cb15d409 100755
--- a/src/de/dhbwstuttgart/syntaxtree/statement/Expression.java
+++ b/src/de/dhbwstuttgart/syntaxtree/statement/Expression.java
@@ -1,8 +1,6 @@
 
 package de.dhbwstuttgart.syntaxtree.statement;
 
-
-import com.sun.istack.internal.NotNull;
 import de.dhbwstuttgart.syntaxtree.SyntaxTreeNode;
 import de.dhbwstuttgart.syntaxtree.type.RefTypeOrTPHOrWildcardOrGeneric;
 import de.dhbwstuttgart.typeinference.assumptions.TypeInferenceBlockInformation;
@@ -13,7 +11,7 @@ public abstract class Expression extends SyntaxTreeNode
 {
     private RefTypeOrTPHOrWildcardOrGeneric type;
 
-    public Expression(@NotNull RefTypeOrTPHOrWildcardOrGeneric type, Token offset){
+    public Expression(RefTypeOrTPHOrWildcardOrGeneric type, Token offset){
         super(offset);
         if(type == null)throw new NullPointerException();
         this.type = type;
diff --git a/src/de/dhbwstuttgart/typeinference/constraints/Pair.java b/src/de/dhbwstuttgart/typeinference/constraints/Pair.java
index 72f98326..a1986c50 100644
--- a/src/de/dhbwstuttgart/typeinference/constraints/Pair.java
+++ b/src/de/dhbwstuttgart/typeinference/constraints/Pair.java
@@ -1,7 +1,6 @@
 package de.dhbwstuttgart.typeinference.constraints;
 import java.io.Serializable;
 
-import com.sun.istack.internal.NotNull;
 import de.dhbwstuttgart.syntaxtree.type.RefTypeOrTPHOrWildcardOrGeneric;
 import de.dhbwstuttgart.typeinference.unify.model.PairOperator;
 import de.dhbwstuttgart.typeinference.unify.model.UnifyPair;
@@ -14,7 +13,7 @@ public class Pair implements Serializable
 
     private PairOperator eOperator = PairOperator.SMALLER;
 
-    Pair(@NotNull RefTypeOrTPHOrWildcardOrGeneric TA1, @NotNull RefTypeOrTPHOrWildcardOrGeneric TA2 )
+    Pair(RefTypeOrTPHOrWildcardOrGeneric TA1, RefTypeOrTPHOrWildcardOrGeneric TA2 )
     {
         this.TA1 = TA1;
         this.TA2 = TA2;
@@ -23,7 +22,7 @@ public class Pair implements Serializable
         eOperator = PairOperator.SMALLER;
     }
 
-    Pair(@NotNull RefTypeOrTPHOrWildcardOrGeneric TA1, @NotNull RefTypeOrTPHOrWildcardOrGeneric TA2, PairOperator eOp)
+    Pair(RefTypeOrTPHOrWildcardOrGeneric TA1, RefTypeOrTPHOrWildcardOrGeneric TA2, PairOperator eOp)
     {
         // Konstruktor
         this(TA1,TA2);