NOISSUE do not keep downloads in memory, add (some) missing virtual dtors

api/logic/java/JavaCheckerJob.h

@@ -28,6 +28,7 @@ class JavaCheckerJob : public Task
 	Q_OBJECT
 public:
 	explicit JavaCheckerJob(QString job_name) : Task(), m_job_name(job_name) {};
+	virtual ~JavaCheckerJob() {};
 
 	bool addJavaCheckerAction(JavaCheckerPtr base)
 	{

api/logic/java/JavaInstallList.h

@@ -68,7 +68,7 @@ class JavaListLoadTask : public Task
 
 public:
 	explicit JavaListLoadTask(JavaInstallList *vlist);
-	~JavaListLoadTask();
+	virtual ~JavaListLoadTask();
 
 	void executeTask() override;
 public slots: