diff --git a/eval4j/src/org/jetbrains/eval4j/interpreter.kt b/eval4j/src/org/jetbrains/eval4j/interpreter.kt
index f2954dd50de..01d65b765f4 100644
--- a/eval4j/src/org/jetbrains/eval4j/interpreter.kt
+++ b/eval4j/src/org/jetbrains/eval4j/interpreter.kt
@@ -173,7 +173,7 @@ class SingleInstructionInterpreter(private val eval: Eval) : Interpreter<Value>(
             CHECKCAST -> {
                 val targetType = Type.getObjectType((insn as TypeInsnNode).desc)
                 if (eval.isInstanceOf(value, targetType)) {
-                    ObjectValue(value.obj, targetType)
+                    ObjectValue(value.obj(), targetType)
                 }
                 else {
                     throwEvalException(ClassCastException("Value '$value' cannot be cast to $targetType"))
@@ -200,8 +200,8 @@ class SingleInstructionInterpreter(private val eval: Eval) : Interpreter<Value>(
             IFGT -> value.int > 0
             IFLE -> value.int <= 0
             IFGE -> value.int >= 0
-            IFNULL -> value.obj == null
-            IFNONNULL -> value.obj != null
+            IFNULL -> value.obj() == null
+            IFNONNULL -> value.obj() != null
             else -> throw UnsupportedByteCodeException("Unknown opcode: $opcode")
         }
     }
@@ -310,8 +310,8 @@ class SingleInstructionInterpreter(private val eval: Eval) : Interpreter<Value>(
             IF_ICMPLE -> value1.int <= value2.int
             IF_ICMPGE -> value1.int >= value2.int
 
-            IF_ACMPEQ -> value1.obj == value2.obj
-            IF_ACMPNE -> value1.obj != value2.obj
+            IF_ACMPEQ -> value1.obj() == value2.obj()
+            IF_ACMPNE -> value1.obj() != value2.obj()
             else -> throw UnsupportedByteCodeException("Unknown opcode: $opcode")
         }
     }
diff --git a/eval4j/src/org/jetbrains/eval4j/interpreterLoop.kt b/eval4j/src/org/jetbrains/eval4j/interpreterLoop.kt
index 2abcb795094..8dc1eb52925 100644
--- a/eval4j/src/org/jetbrains/eval4j/interpreterLoop.kt
+++ b/eval4j/src/org/jetbrains/eval4j/interpreterLoop.kt
@@ -151,7 +151,7 @@ fun interpreterLoop(
                             val expectedType = Type.getReturnType(m.desc)
                             if (expectedType.getSort() == Type.OBJECT) {
                                 val coerced = if (value != NULL_VALUE && value.asmType != expectedType)
-                                                    ObjectValue(value.obj, expectedType)
+                                                    ObjectValue(value.obj(), expectedType)
                                               else value
                                 return ValueReturned(coerced)
                             }
diff --git a/eval4j/src/org/jetbrains/eval4j/jdi/jdiEval.kt b/eval4j/src/org/jetbrains/eval4j/jdi/jdiEval.kt
index 4a81803a099..93a473ac7fe 100644
--- a/eval4j/src/org/jetbrains/eval4j/jdi/jdiEval.kt
+++ b/eval4j/src/org/jetbrains/eval4j/jdi/jdiEval.kt
@@ -94,7 +94,7 @@ class JDIEval(
     }
 
     override fun setArrayElement(array: Value, index: Value, newValue: Value) {
-        array.array().setValue(index.int, newValue.asJdiValue(vm))
+        array.array().setValue(index.int, newValue.asJdiValue(vm, array.asmType.arrayElementType))
     }
 
     private fun findField(fieldDesc: FieldDescription): jdi.Field {
@@ -131,7 +131,7 @@ class JDIEval(
             throwEvalException(NoSuchFieldError("Can't a field in a non-class: $field"))
         }
 
-        val jdiValue = newValue.asJdiValue(vm)
+        val jdiValue = newValue.asJdiValue(vm, field.`type`().asType())
         mayThrow { _class.setValue(field, jdiValue) }
     }
 
@@ -158,7 +158,7 @@ class JDIEval(
         val _class = method.declaringType()
         if (_class !is jdi.ClassType) throwEvalException(NoSuchMethodError("Static method is a non-class type: $method"))
 
-        val args = arguments.map { v -> v.asJdiValue(vm) }
+        val args = mapArguments(arguments, method.argumentTypes())
         val result = mayThrow { _class.invokeMethod(thread, method, args, 0) }
         return result.asValue()
     }
@@ -174,7 +174,7 @@ class JDIEval(
         val field = findField(fieldDesc)
         val obj = instance.jdiObj.checkNull()
 
-        val jdiValue = newValue.asJdiValue(vm)
+        val jdiValue = newValue.asJdiValue(vm, field.`type`().asType())
         mayThrow { obj.setValue(field, jdiValue) }
     }
 
@@ -184,7 +184,7 @@ class JDIEval(
                 // Constructor call
                 val ctor = findMethod(methodDesc)
                 val _class = (instance as NewObjectValue).asmType.asReferenceType() as jdi.ClassType
-                val args = arguments.map { v -> v.asJdiValue(vm) }
+                val args = mapArguments(arguments, ctor.argumentTypes())
                 val result = mayThrow { _class.newInstance(thread, ctor, args, 0) }
                 instance.value = result
                 return result.asValue()
@@ -197,10 +197,17 @@ class JDIEval(
         val method = findMethod(methodDesc)
 
         val obj = instance.jdiObj.checkNull()
-        val args = arguments.map { v -> v.asJdiValue(vm) }
+        val args = mapArguments(arguments, method.argumentTypes())
         val result = mayThrow { obj.invokeMethod(thread, method, args, 0) }
         return result.asValue()
     }
+
+    private fun mapArguments(arguments: List<Value>, expecetedTypes: List<jdi.Type>): List<jdi.Value?> {
+        return arguments.zip(expecetedTypes).map {
+            val (arg, expectedType) = it
+            arg.asJdiValue(vm, expectedType.asType())
+        }
+    }
 }
 
 fun <T> mayThrow(f: () -> T): T {
diff --git a/eval4j/src/org/jetbrains/eval4j/jdi/jdiValues.kt b/eval4j/src/org/jetbrains/eval4j/jdi/jdiValues.kt
index 76e1c272495..b409366ee87 100644
--- a/eval4j/src/org/jetbrains/eval4j/jdi/jdiValues.kt
+++ b/eval4j/src/org/jetbrains/eval4j/jdi/jdiValues.kt
@@ -52,16 +52,16 @@ fun jdi.Value?.asValue(): Value {
 fun jdi.Type.asType(): Type = Type.getType(this.signature())
 
 val Value.jdiObj: jdi.ObjectReference?
-    get() = this.obj as jdi.ObjectReference?
+    get() = this.obj() as jdi.ObjectReference?
 
 val Value.jdiClass: jdi.ClassObjectReference?
     get() = this.jdiObj as jdi.ClassObjectReference?
 
-fun Value.asJdiValue(vm: jdi.VirtualMachine): jdi.Value? {
+fun Value.asJdiValue(vm: jdi.VirtualMachine, expectedType: Type): jdi.Value? {
     return when (this) {
         NULL_VALUE -> null
         VOID_VALUE -> vm.mirrorOfVoid()
-        is IntValue -> when (asmType) {
+        is IntValue -> when (expectedType) {
             Type.BOOLEAN_TYPE -> vm.mirrorOf(boolean)
             Type.BYTE_TYPE -> vm.mirrorOf(int.toByte())
             Type.SHORT_TYPE -> vm.mirrorOf(int.toShort())
@@ -73,7 +73,7 @@ fun Value.asJdiValue(vm: jdi.VirtualMachine): jdi.Value? {
         is FloatValue -> vm.mirrorOf(value)
         is DoubleValue -> vm.mirrorOf(value)
         is ObjectValue -> value as jdi.ObjectReference
-        is NewObjectValue -> this.obj as jdi.ObjectReference
+        is NewObjectValue -> this.obj() as jdi.ObjectReference
         else -> throw JDIFailureException("Unknown value: $this")
     }
 }
\ No newline at end of file
diff --git a/eval4j/src/org/jetbrains/eval4j/values.kt b/eval4j/src/org/jetbrains/eval4j/values.kt
index 49438ca315f..d81d313cfab 100644
--- a/eval4j/src/org/jetbrains/eval4j/values.kt
+++ b/eval4j/src/org/jetbrains/eval4j/values.kt
@@ -89,15 +89,21 @@ val Value.int: Int get() = (this as IntValue).value
 val Value.long: Long get() = (this as LongValue).value
 val Value.float: Float get() = (this as FloatValue).value
 val Value.double: Double get() = (this as DoubleValue).value
-val Value.obj: Any?
-    get(): Any? {
-        if (this is NewObjectValue) {
-            val v = value
-            if (v == null) throw IllegalStateException("Trying to access an unitialized object: $this")
-            return v
-        }
-        return (this as AbstractValue<*>).value
+fun Value.obj(expectedType: Type = asmType): Any? {
+    if (this is NewObjectValue) {
+        val v = value
+        if (v == null) throw IllegalStateException("Trying to access an unitialized object: $this")
+        return v
     }
+    return when {
+        expectedType == asmType -> (this as AbstractValue<*>).value
+        expectedType == Type.BOOLEAN_TYPE -> this.boolean
+        expectedType == Type.SHORT_TYPE -> (this as IntValue).int.toShort()
+        expectedType == Type.BYTE_TYPE -> (this as IntValue).int.toByte()
+        expectedType == Type.CHAR_TYPE -> (this as IntValue).int.toChar()
+        else -> (this as AbstractValue<*>).value
+    }
+}
 
 fun <T: Any> T?.checkNull(): T {
     if (this == null) {
diff --git a/eval4j/test/org/jetbrains/eval4j/jdi/test/jdiTest.kt b/eval4j/test/org/jetbrains/eval4j/jdi/test/jdiTest.kt
index 7b473e1a7d0..f2252a8d8fe 100644
--- a/eval4j/test/org/jetbrains/eval4j/jdi/test/jdiTest.kt
+++ b/eval4j/test/org/jetbrains/eval4j/jdi/test/jdiTest.kt
@@ -115,7 +115,7 @@ fun suite(): TestSuite {
                     }
 
                     if (expected is ValueReturned && value is ValueReturned && value.result is ObjectValue) {
-                        assertEquals(expected.result.obj.toString(), value.result.jdiObj.callToString())
+                        assertEquals(expected.result.obj().toString(), value.result.jdiObj.callToString())
                     }
                     else {
                         assertEquals(expected, value)
diff --git a/eval4j/test/org/jetbrains/eval4j/test/TestData.java b/eval4j/test/org/jetbrains/eval4j/test/TestData.java
index 83889be679b..5a22a6d7523 100644
--- a/eval4j/test/org/jetbrains/eval4j/test/TestData.java
+++ b/eval4j/test/org/jetbrains/eval4j/test/TestData.java
@@ -48,6 +48,91 @@ class TestData {
         return "str";
     }
 
+    static Integer integerValueOf() { return 1; }
+
+    static Byte byteValueOf() { return 1; }
+
+    static Short shortValueOf() { return 1; }
+
+    static Long longValueOf() { return 1L; }
+
+    static Float floatValueOf() { return 1.0f; }
+
+    static Double doubleValueOf() { return 1.0; }
+
+    static Character charValueOf() { return 1; }
+
+    static Boolean booleanValueOf() { return true; }
+
+    static void castFieldTypes() {
+        CastFieldType.i = 1;
+        CastFieldType.b = 1;
+        CastFieldType.s = 1;
+        CastFieldType.c = 1;
+        CastFieldType.bool = true;
+        CastFieldType.l = 1;
+        CastFieldType.f = 1.0f;
+        CastFieldType.d = 1.0;
+
+        CastFieldType klass = new CastFieldType();
+        klass.im = 1;
+        klass.bm = 1;
+        klass.sm = 1;
+        klass.cm = 1;
+        klass.boolm = true;
+        klass.lm = 1;
+        klass.fm = 1;
+        klass.dm = 1;
+
+        Integer i = klass.im;
+        Byte b = klass.bm;
+        Short s = klass.sm;
+        Character c = klass.cm;
+        Boolean bool = klass.boolm;
+        Long l = klass.lm;
+        Float f = klass.fm;
+        Double d = klass.dm;
+    }
+
+    static class CastFieldType {
+        static int i = 1;
+        static byte b = 1;
+        static short s = 1;
+        static char c = 1;
+        static boolean bool = true;
+        static long l = 1;
+        static float f = 1;
+        static double d = 1;
+
+        int im = 1;
+        byte bm = 1;
+        short sm = 1;
+        char cm = 1;
+        boolean boolm = true;
+        long lm = 1;
+        float fm = 1;
+        double dm = 1;
+    }
+
+    static void castArrayElementType() {
+        int[] i = new int[1];
+        i[0] = 1;
+        short[] s = new short[1];
+        s[0] = 1;
+        byte[] b = new byte[1];
+        b[0] = 1;
+        char[] c = new char[1];
+        c[0] = 1;
+        boolean[] bool = new boolean[1];
+        bool[0] = true;
+        long[] l = new long[1];
+        l[0] = 1;
+        float[] f = new float[1];
+        f[0] = 1;
+        double[] d = new double[1];
+        d[0] = 1;
+    }
+
     static int variable() {
         int i = 153;
         return i;
diff --git a/eval4j/test/org/jetbrains/eval4j/test/main.kt b/eval4j/test/org/jetbrains/eval4j/test/main.kt
index ef23b6c6445..aed54cb0516 100644
--- a/eval4j/test/org/jetbrains/eval4j/test/main.kt
+++ b/eval4j/test/org/jetbrains/eval4j/test/main.kt
@@ -96,7 +96,7 @@ object REFLECTION_EVAL : Eval {
 
     override fun isInstanceOf(value: Value, targetType: Type): Boolean {
         val _class = findClass(targetType)
-        return _class.isInstance(value.obj)
+        return _class.isInstance(value.obj())
     }
 
     [suppress("UNCHECKED_CAST")]
@@ -109,13 +109,13 @@ object REFLECTION_EVAL : Eval {
     }
 
     override fun getArrayLength(array: Value): Value {
-        return int(JArray.getLength(array.obj.checkNull()))
+        return int(JArray.getLength(array.obj().checkNull()))
     }
 
     override fun getArrayElement(array: Value, index: Value): Value {
         val asmType = array.asmType
         val elementType = if (asmType.getDimensions() == 1) asmType.getElementType() else Type.getType(asmType.getDescriptor().substring(1))
-        val arr = array.obj.checkNull()
+        val arr = array.obj().checkNull()
         val ind = index.int
         return when (elementType.getSort()) {
             Type.BOOLEAN -> boolean(JArray.getBoolean(arr, ind))
@@ -136,10 +136,10 @@ object REFLECTION_EVAL : Eval {
     }
 
     override fun setArrayElement(array: Value, index: Value, newValue: Value) {
-        val arr = array.obj.checkNull()
+        val arr = array.obj().checkNull()
         val ind = index.int
         if (array.asmType.getDimensions() > 1) {
-            JArray.set(arr, ind, newValue.obj)
+            JArray.set(arr, ind, newValue.obj())
             return
         }
         val elementType = array.asmType.getElementType()
@@ -154,7 +154,7 @@ object REFLECTION_EVAL : Eval {
             Type.DOUBLE -> JArray.setDouble(arr, ind, newValue.double)
             Type.OBJECT,
             Type.ARRAY -> {
-                JArray.set(arr, ind, newValue.obj)
+                JArray.set(arr, ind, newValue.obj())
             }
             else -> throw UnsupportedOperationException("Unsupported array element type: $elementType")
         }
@@ -183,7 +183,7 @@ object REFLECTION_EVAL : Eval {
 
     override fun setStaticField(fieldDesc: FieldDescription, newValue: Value) {
         val field = findStaticField(fieldDesc)
-        val obj = newValue.obj
+        val obj = newValue.obj(fieldDesc.fieldType)
         mayThrow {field.set(null, obj)}
     }
 
@@ -199,7 +199,7 @@ object REFLECTION_EVAL : Eval {
         assertTrue(methodDesc.isStatic)
         val method = findClass(methodDesc).findMethod(methodDesc)
         assertNotNull("Method not found: $methodDesc", method)
-        val args = arguments.map { v -> v.obj }.copyToArray()
+        val args = mapArguments(arguments, methodDesc.parameterTypes).copyToArray()
         val result = mayThrow {method!!.invoke(null, *args)}
         return objectToValue(result, methodDesc.returnType)
     }
@@ -213,17 +213,17 @@ object REFLECTION_EVAL : Eval {
     }
 
     override fun getField(instance: Value, fieldDesc: FieldDescription): Value {
-        val obj = instance.obj.checkNull()
+        val obj = instance.obj().checkNull()
         val field = findInstanceField(obj, fieldDesc)
 
         return objectToValue(mayThrow {field.get(obj)}, fieldDesc.fieldType)
     }
 
     override fun setField(instance: Value, fieldDesc: FieldDescription, newValue: Value) {
-        val obj = instance.obj.checkNull()
+        val obj = instance.obj().checkNull()
         val field = findInstanceField(obj, fieldDesc)
 
-        val newObj = newValue.obj
+        val newObj = newValue.obj(fieldDesc.fieldType)
         mayThrow {field.set(obj, newObj)}
     }
 
@@ -242,7 +242,7 @@ object REFLECTION_EVAL : Eval {
                 val _class = findClass((instance as NewObjectValue).asmType)
                 val ctor = _class.findConstructor(methodDesc)
                 assertNotNull("Constructor not found: $methodDesc", ctor)
-                val args = arguments.map { v -> v.obj }.copyToArray()
+                val args = mapArguments(arguments, methodDesc.parameterTypes).copyToArray()
                 val result = mayThrow {ctor!!.newInstance(*args)}
                 instance.value = result
                 return objectToValue(result, instance.asmType)
@@ -252,13 +252,20 @@ object REFLECTION_EVAL : Eval {
                 throw UnsupportedOperationException("invokespecial is not suported yet")
             }
         }
-        val obj = instance.obj.checkNull()
+        val obj = instance.obj().checkNull()
         val method = obj.javaClass.findMethod(methodDesc)
         assertNotNull("Method not found: $methodDesc", method)
-        val args = arguments.map { v -> v.obj }.copyToArray()
+        val args = mapArguments(arguments, methodDesc.parameterTypes).copyToArray()
         val result = mayThrow {method!!.invoke(obj, *args)}
         return objectToValue(result, methodDesc.returnType)
     }
+
+    private fun mapArguments(arguments: List<Value>, expecetedTypes: List<Type>): List<Any?> {
+        return arguments.zip(expecetedTypes).map {
+            val (arg, expectedType) = it
+            arg.obj(expectedType)
+        }
+    }
 }
 
 class ReflectionLookup(val classLoader: ClassLoader) {