diff --git a/api/logic/minecraft/ComponentUpdateTask.cpp b/api/logic/minecraft/ComponentUpdateTask.cpp
index e03318c5..2d6ceb91 100644
--- a/api/logic/minecraft/ComponentUpdateTask.cpp
+++ b/api/logic/minecraft/ComponentUpdateTask.cpp
@@ -124,6 +124,8 @@ static LoadResult loadComponent(ComponentPtr component, shared_qobject_ptr<Task>
 	return result;
 }
 
+// FIXME: dead code. determine if this can still be useful?
+/*
 static LoadResult loadComponentList(ComponentPtr component, shared_qobject_ptr<Task>& loadTask, Net::Mode netmode)
 {
 	if(component->m_loaded)
@@ -147,6 +149,7 @@ static LoadResult loadComponentList(ComponentPtr component, shared_qobject_ptr<T
 	}
 	return result;
 }
+*/
 
 static LoadResult loadIndex(shared_qobject_ptr<Task>& loadTask, Net::Mode netmode)
 {
diff --git a/application/pages/VersionPage.cpp b/application/pages/VersionPage.cpp
index b4e20246..00ae0a7e 100644
--- a/application/pages/VersionPage.cpp
+++ b/application/pages/VersionPage.cpp
@@ -354,7 +354,8 @@ void VersionPage::on_downloadBtn_clicked()
 	}
 	ProgressDialog tDialog(this);
 	connect(updateTask.get(), SIGNAL(failed(QString)), SLOT(onGameUpdateError(QString)));
-	int ret = tDialog.execWithTask(updateTask.get());
+	// FIXME: unused return value
+	tDialog.execWithTask(updateTask.get());
 	updateButtons();
 	m_container->refreshContainer();
 }
diff --git a/libraries/classparser/src/annotations.h b/libraries/classparser/src/annotations.h
index aa25d241..dd603af3 100644
--- a/libraries/classparser/src/annotations.h
+++ b/libraries/classparser/src/annotations.h
@@ -42,6 +42,7 @@ protected:
 
 public:
 	element_value(element_value_type type, constant_pool &pool) : type(type), pool(pool) {};
+	virtual ~element_value() {}
 
 	element_value_type getElementValueType()
 	{
diff --git a/libraries/classparser/src/constants.h b/libraries/classparser/src/constants.h
index 242b943e..9c74ab20 100644
--- a/libraries/classparser/src/constants.h
+++ b/libraries/classparser/src/constants.h
@@ -21,14 +21,12 @@ public:
 		j_methodref = 10,
 		j_interface_methodref = 11,
 		j_nameandtype = 12
+		// FIXME: missing some constant types, see https://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html#jvms-4.4
 	} type;
 
 	constant(util::membuffer &buf)
 	{
 		buf.read(type);
-		// invalid constant type!
-		if (type > j_nameandtype || type == (type_t)0 || type == (type_t)2)
-			throw new classfile_exception();
 
 		// load data depending on type
 		switch (type)
@@ -65,10 +63,13 @@ public:
 			buf.read_be(name_and_type.name_index);
 			buf.read_be(name_and_type.descriptor_index);
 			break;
+		default:
+			// invalid constant type!
+			throw new classfile_exception();
 		}
 	}
 
-	constant(int fake)
+	constant(int)
 	{
 		type = j_hole;
 	}
@@ -115,6 +116,9 @@ public:
 			ss << "NameAndType: " << name_and_type.name_index << " "
 			   << name_and_type.descriptor_index;
 			break;
+		default:
+			ss << "Invalid entry (" << int(type) << ")";
+			break;
 		}
 		return ss.str();
 	}
@@ -166,10 +170,10 @@ public:
 	 */
 	void load(util::membuffer &buf)
 	{
+		// FIXME: @SANITY this should check for the end of buffer.
 		uint16_t length = 0;
 		buf.read_be(length);
 		length--;
-		uint16_t index = 1;
 		const constant *last_constant = nullptr;
 		while (length)
 		{
@@ -182,12 +186,10 @@ public:
 				// push in a fake constant to preserve indexing
 				constants.push_back(constant(0));
 				length -= 2;
-				index += 2;
 			}
 			else
 			{
 				length--;
-				index++;
 			}
 		}
 	}