[NETBEANS-2507] Slow Java code completion

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 11.0
• Fix Version/s: 11.2
• Component/s: ide - Performance, java - Editor

Environment

Product Version: Apache NetBeans IDE 11.0 (Build incubator-netbeans-release-404-on-20190319)
Java: 12.0.1; OpenJDK 64-Bit Server VM 12.0.1+12
Runtime: OpenJDK Runtime Environment 12.0.1+12
System: Windows 10 version 10.0 running on amd64; UTF-8; en_GB (nb)

• Assignee: Unassigned
• Reporter: Anthony Vanelverdinghe
• Created: 06/May/19 08:30
• Updated: 03/Nov/20 15:47
• Resolved: 09/Nov/19 09:59

Description

There are serious issues with code completion in recent NetBeans versions. Attached is a profiling snapshot: all I did was triggering autocompletion at "java.nio.file.Files.<cursor>"

Of the 2 "Code Completion" threads with the most CPU time:

• one spends over 9 seconds in FastJar::list
• the other involves a call to org.netbeans.modules.j2ee.persistence.editor.completion.JPACodeCompletionProvider$JPACodeCompletionQuery.query () even though the code completion had nothing to do with JPA and neither the project nor the class use JPA

Issue Links

• is related to: NETBEANS-2409 Very Slow Operations on Windows