diff --git a/plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/codeInspection/GroovyLocalInspectionBase.java b/plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/codeInspection/GroovyLocalInspectionBase.java
index 57fecc109552..ed5c7c0c5ea1 100644
--- a/plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/codeInspection/GroovyLocalInspectionBase.java
+++ b/plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/codeInspection/GroovyLocalInspectionBase.java
@@ -67,5 +67,5 @@ public abstract class GroovyLocalInspectionBase extends GroovySuppressableInspec
     });
   }
 
-  protected abstract void check(GrControlFlowOwner owner, ProblemsHolder problemsHolder);
+  protected abstract void check(@NotNull GrControlFlowOwner owner, @NotNull ProblemsHolder problemsHolder);
 }
diff --git a/plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/codeInspection/dataflow/GroovyVariableCanBeFinalInspection.java b/plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/codeInspection/dataflow/GroovyVariableCanBeFinalInspection.java
index 0727fff2f2b5..32219454b54c 100644
--- a/plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/codeInspection/dataflow/GroovyVariableCanBeFinalInspection.java
+++ b/plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/codeInspection/dataflow/GroovyVariableCanBeFinalInspection.java
@@ -96,7 +96,7 @@ public class GroovyVariableCanBeFinalInspection extends GroovyLocalInspectionBas
   }
 
   @Override
-  public void check(final GrControlFlowOwner owner, final ProblemsHolder problemsHolder) {
+  public void check(@NotNull final GrControlFlowOwner owner, @NotNull final ProblemsHolder problemsHolder) {
     final Instruction[] flow = owner.getControlFlow();
     final DFAEngine<TObjectIntHashMap<GrVariable>> engine = new DFAEngine<TObjectIntHashMap<GrVariable>>(
       flow,
diff --git a/plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/codeInspection/unassignedVariable/UnassignedVariableAccessInspection.java b/plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/codeInspection/unassignedVariable/UnassignedVariableAccessInspection.java
index 1c15cccee402..2c4e1dd018f9 100644
--- a/plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/codeInspection/unassignedVariable/UnassignedVariableAccessInspection.java
+++ b/plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/codeInspection/unassignedVariable/UnassignedVariableAccessInspection.java
@@ -88,7 +88,7 @@ public class UnassignedVariableAccessInspection extends GroovyLocalInspectionBas
   }
 
   @Override
-  protected void check(GrControlFlowOwner owner, ProblemsHolder problemsHolder) {
+  protected void check(@NotNull GrControlFlowOwner owner, @NotNull ProblemsHolder problemsHolder) {
     Instruction[] flow = owner.getControlFlow();
     ReadWriteVariableInstruction[] reads = ControlFlowBuilderUtil.getReadsWithoutPriorWrites(flow, true);
     for (ReadWriteVariableInstruction read : reads) {
diff --git a/plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/codeInspection/unusedDef/UnusedDefInspection.java b/plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/codeInspection/unusedDef/UnusedDefInspection.java
index 04805e98ee8d..023d2681dceb 100644
--- a/plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/codeInspection/unusedDef/UnusedDefInspection.java
+++ b/plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/codeInspection/unusedDef/UnusedDefInspection.java
@@ -85,7 +85,7 @@ public class UnusedDefInspection extends GroovyLocalInspectionBase {
 
 
   @Override
-  protected void check(final GrControlFlowOwner owner, final ProblemsHolder problemsHolder) {
+  protected void check(@NotNull final GrControlFlowOwner owner, @NotNull final ProblemsHolder problemsHolder) {
     final Instruction[] flow = owner.getControlFlow();
     final ReachingDefinitionsDfaInstance dfaInstance = new ReachingDefinitionsDfaInstance(flow);
     final ReachingDefinitionsSemilattice lattice = new ReachingDefinitionsSemilattice();