Memory Leak in Ubuntu 16.04

[Herrmann Maier]

Good day,

I run Ubuntu 16.04 in 64 bit, with free Radeon graphics driver (AMD Radeon HD 
6450 graphics card), and with Oracle's JDK version 1.8.0_92 .

When I run JavaFX applications, like the JDK's Ensemble demo or my own 
programs, there's a memory leak when FX shows some "action" like animated or 
otherwise active FX components. Firstly, FX's animation loop doesn't run with 
60 but 120 fps, and secondly the needed memory for the Java task grows until 
my physical RAM size is reached, then the system starts to swap memory until 
it stalls.

The memory leak only appears when the FX application does do something, e.g. 
when there's a JavaFX animation loop or when I click a FX  button. When I 
just start the Ensemble demo and don't press any key or mouse button, the 
memory is OK.

Also Swing and other Java programs work fine on the same system.

When I manually invoke "System.gc() at the end of my FX's animation loop, the 
memory gets released, i.e. no memory leak. But the downside is that the FX 
program then runs very slow because of the manual gc() at each frame.

I also tried to use different garbage collection parameters with "java 
-X...", but it didn't help.

How can I encircle the problem, please? Thanks in advance.

Regards,
Herrmann