Disabling Copy Paste in Java

So i'm using an app called uworld on Java browser. It blocks the clipboard and i'm unable to copy and paste stuff.

I've tried going to policy tool and adding AWT permission for access to clipboard, but it didn't work.

Java Console - UWorld
Java web start 11.211.2.12 x86
Using JRE version 1.8.0_211-b12 Java Hotspot(TM) Client VM
User home directory = C:wsersiibtis
c:
f:
g:
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p:
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clear console window
finalize objects on finalization queue
garbage collect
display this help message
print memory usage
trigger logging
reload proxy configuration
hide console
reload policy configuration
dump system and deployment properties
dump thread list
dump thread stack
0-5: set trace level to 
02:57:48 SEVERE: [0711/025748.552:ERROR:binder_registry.cc(50)] Failed to locate a binder for interface: blink: :mojom: :SensitiveInputVisibilityService
02 SEVERE: [07111025752.289: ERROR .cpp( 154)] NOT IMPLEMENTED
https : I lwww.uworld.com/ClientApp/V2/apps/Qbank/index.html#/test/welcome/4992753
A Parser-blocking, cross site (i.e. different eTLD+1) script, https://www.google.com/uds/api/visualization/l.0/36SS8b280aac4fa99ed8215e60015cff/webfontloader,dygraph,format+en,default+en,ui+en,line+en,corechart+en.I.js, is invoked via document.write. The network request for this script MAY be blocked by t
A Parser-blocking, cross site (i.e. different eTLD+1) script, https://www.google.com/uds/api/visualization/l.0/36558b280aac4fa99ed8215e60015cff/webfontloader,dygraph,format+en,default+en,ui+en,line+en,corechart+en.I.js, is invoked via document.write. The network request for this script MAY be blocked by t
Mixed Content: The page at 'https://www.uworld.com/ClientApp/V2/apps/Qbank/index.html#/launchtest/4992753/nbme/1416S1731/3/1' was loaded over HTTPS, but requested an insecure image 'http://www.uworld.com/media/'. This content should also be served over HTTPS.
JNLPClassLoader: Finding library ntpsd1132. dll
Uncaught Error: Container is not defined
java. IllegalStateException: cannot open system clipboard
at sun. awt , windows. WClipboard. openClipboard(Native Method)
Unknown Source)
31-111. ant. windows. WClipboard. setContentsNative
at
at sun , ant , datatransfer. SunClipboard , setContents(lJnknown Source)
at com.uworld.osi.ClipbordCheck.run(lJnknown Source)
java. lang. IllegalStateException: cannot open system clipboard
at sun. awt. windows. WClipboard. openClipboard(Native Method)
at sun. awt. windows. WClipboard. setContentsNative(Unknown Source)
at sun. awt. datatransfer. SunClipboard , setContents(lJnknown Source)
at com.uworld.osi.ClipbordCheck.run(lJnknown Source)
java. lang. IllegalStateException: cannot open system clipboard
at sun , awt , windows. WClipboard. openClipboard(Native Method)
at sun. awt. windows. WClipboard. setContentsNative(Unknown Source)
at sun. awt. datatransfer. SunClipboard. setContents(lJnknown Source)
at com.uworld.osi.ClipbordCheck.run(lJnknown Source)
java. lang. IllegalStateException: cannot open system clipboard
at sun. awt. windows. WClipboard. openClipboard(Native Method)
at sun. awt. windows. WClipboard. setContentsNative(Unknown Source)
at sun. awt. datatransfer. SunClipboard. setContents(lJnknown Source)
at com.uworld.osi.ClipbordCheck.run(lJnknown Source)