[NETBEANS-2292] In debugger, step over compute-intensive line takes "forever", but running to breakpoint is fast

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 8.2
• Component/s: debugger - Java

Environment

Windows 10 pro, Oracle JDK 1.8.0_144

• Assignee: Unassigned
• Reporter: john lilley
• Created: 21/Mar/19 19:56
• Updated: 21/Mar/19 19:56

Description

Given this code:

import java.security.KeyPair;
import java.security.KeyPairGenerator;
public class Scratch {
{{ public static void main(String[] args) throws Exception {}}
   KeyPairGenerator rsaKpGen = KeyPairGenerator.getInstance("RSA");
   rsaKpGen.initialize(4096);
   KeyPair kp = rsaKpGen.generateKeyPair();
   int x = 1;
{{ }}}}

If I set a breakpoint on the first line of main, then step through one line at a time, it will take "forever" to step over the generateKeyPair(). If I pause the debugger, it is in deep in BigInteger.probablePrime().  However, if I set a breakpoint at x=1 and start debugging, it will get there in a few seconds.

There are no other breakpoints set.