diff --git a/src/main/java/org/jd/core/v1/service/deserializer/classfile/ClassFileDeserializer.java b/src/main/java/org/jd/core/v1/service/deserializer/classfile/ClassFileDeserializer.java
index a61f14e..70d24f4 100644
--- a/src/main/java/org/jd/core/v1/service/deserializer/classfile/ClassFileDeserializer.java
+++ b/src/main/java/org/jd/core/v1/service/deserializer/classfile/ClassFileDeserializer.java
@@ -13,6 +13,7 @@
 import org.apache.bcel.classfile.InnerClass;
 import org.apache.bcel.classfile.InnerClasses;
 import org.apache.bcel.classfile.Method;
+import org.apache.commons.lang3.Validate;
 import org.jd.core.v1.api.loader.Loader;
 import org.jd.core.v1.model.classfile.ClassFile;
 import org.jd.core.v1.util.DefaultList;
@@ -28,31 +29,11 @@
 public final class ClassFileDeserializer {
 
     public ClassFile loadClassFile(Loader loader, String internalTypeName) throws IOException {
-        ClassFile classFile = innerLoadClassFile(loader, internalTypeName);
-
-        if (classFile == null) {
-            throw new IllegalArgumentException("Class '" + internalTypeName + "' could not be loaded");
-        }
-        for (Method method : classFile.getMethods()) {
-            Code methodCode = method.getCode();
-            if (methodCode == null) {
-                continue;
-            }
-           ByteCodeUtil.cleanUpByteCode(methodCode.getCode());
-        }
-        return classFile;
-    }
-
-    private ClassFile innerLoadClassFile(Loader loader, String internalTypeName) throws IOException {
-        if (!loader.canLoad(internalTypeName)) {
-            return null;
-        }
+        Validate.isTrue(loader.canLoad(internalTypeName), "Class %s could not be loaded", internalTypeName);
 
         byte[] data = loader.load(internalTypeName);
 
-        if (data == null) {
-            return null;
-        }
+        Validate.notNull(data, "Class %s could not be loaded", internalTypeName);
 
         try (DataInputStream reader = new DataInputStream(new ByteArrayInputStream(data))) {
 
@@ -72,7 +53,7 @@ private ClassFile innerLoadClassFile(Loader loader, String internalTypeName) thr
                     String outerTypeName = ic.getOuterClassIndex() == 0 ? null : cp.getConstantString(ic.getOuterClassIndex(), Const.CONSTANT_Class);
 
                     if (!internalTypeName.equals(innerTypeName) && (internalTypeName.equals(outerTypeName) || innerTypeName.startsWith(innerTypePrefix))) {
-                        ClassFile innerClassFile = innerLoadClassFile(loader, innerTypeName);
+                        ClassFile innerClassFile = loadClassFile(loader, innerTypeName);
                         int flags = ic.getInnerAccessFlags();
                         int length;
 
@@ -101,6 +82,13 @@ private ClassFile innerLoadClassFile(Loader loader, String internalTypeName) thr
                     classFile.setInnerClassFiles(innerClassFiles);
                 }
             }
+            for (Method method : classFile.getMethods()) {
+                Code methodCode = method.getCode();
+                if (methodCode == null) {
+                    continue;
+                }
+                ByteCodeUtil.cleanUpByteCode(methodCode.getCode());
+            }
             return classFile;
         }
     }
diff --git a/src/test/java/org/jd/core/v1/ClassFileDeserializerTest.java b/src/test/java/org/jd/core/v1/ClassFileDeserializerTest.java
index c5d7799..8473cd4 100644
--- a/src/test/java/org/jd/core/v1/ClassFileDeserializerTest.java
+++ b/src/test/java/org/jd/core/v1/ClassFileDeserializerTest.java
@@ -46,7 +46,9 @@ public byte[] load(String internalName) throws IOException {
             fail("Expected exception");
         }
         // Expecting exception because class cannot be loaded
-        catch (IllegalArgumentException expected) { }
+        catch (IllegalArgumentException expected) {
+            assertEquals("Class DoesNotExist could not be loaded", expected.getMessage());
+        }
     }
 
     @Test