STS freezes during code autocomplete when running under OpenJDK 11 and Windows

[logicg8]

Steps to reproduce:

(Preconditions - Windows 7 with latest patches installed and running; Oracle's Open JDK 11 downloaded and on local file system; Oracle's JDK 1.8.0_191 downloaded and on local file system)

1. In SpringToolSuite4.ini, enter line -vm <path-to-Oracle-OpenJDK11.0.1> or set as Windows' default JDK via PATH and JAVA_HOME environment variables.
2. Execute SpringToolSuite4.exe
3. Add another JRE to STS
   a. Click Window->Preferences
   b. Click Java->Installed JREs
   c. Click Add...
   d. Click Standard VM
   e. Click Next>
   f. Click Directory and navigate to bin directory of Oracle's JDK 1.8.0_191
   g. Click Finish
   h. Click Apply and Close
4. Create a Java project
   a. Click File->New->JavaProject
   b. Click "Use a project specific JRE"
   c. Select the jdk1.8.0_191 added in step 3.
   c. Click Finish
5. Create a Class
   a. Right click on project
   b. Click New->Class
   c. Enter a class name
   d. Click Finish
6. In the editor, type in the full package name of a class.
7. Use backspace and change to a different.
8. Repeat step 7 several times.

At step 7, system starts to lag and eventually freezes. Note: Issue occurs more rapidly if Java 11 Support for Eclipse 2018-09 is installed. Consistently reproduced on Windows 7. Unable to reproduce on a Mac High Sierra.

[logicg8]

Also reproduced on Windows 10

[kdvolder]

Step 6: In the editor, type in the full package name of a class.

Type it where exactly? If this bug has something to do with content assist processing, which seems likely, I'd expect it really matter where exactly in the file we are typing because this sort of functionality is very context sensitive.

[kdvolder]

Couldn't reproduce in Linux. Now switching to Windows 10 VM.

[kdvolder]

Can't reproduce this on Windows 10 either. I followed instructions to the letter.

For the part where we type package name repeatedly I tried both in the place where we declare package, as well as in the class body. I didn't experience any ui freezes.

If you can please add some details / clariication around exactly what I'm supposed to do for steps 7 and 8, that would be nice. For example:

• where exactly are we typing
• are we typing existing package names, or new package names, or just whatever.
• are we keeping content assist active while typing.
• are we keeping content assist active while backspacing.
• are we typing every letter or using content assist to complete (parts of) the package names

I did try a bit with different variations like that but no freezes / slowdowns where observed.

Still, knowing exactly what it is you do might help and I could give it another.

[kdvolder]

Another question. Have you tried reproducing this on a Vanilla Eclipse 4.9? It seems likely this not specifically an STS bug. By trying it with a plain Eclipse this could be confirmed. If I could reproduce it myself, I would try Vanilla Eclipse myself, but since I am not yet able to reproduce it at all...

[logicg8]

This occurs in the editor view. For example, suppose I have this already in a file, Person.java.: public class Person { } If I open in the editor and start to type inside the class such as "com.su" as follows: public class Person { com.su } Note: You must change the text a few times say from com.su to org.something.somethingelse and then you should see the lag and eventually cause the application to freeze.

…

On Fri, Nov 23, 2018 at 3:17 PM Kris De Volder ***@***.***> wrote: Step 6: In the editor, type in the full package name of a class. Type it where exactly? If this bug has something to do with content assist processing, which seems likely, I'd expect it really matter where exactly in the file we are typing because this sort of functionality is very context sensitive. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#140 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAUseinHYmdN50NpQmUktB_WYD9gRKTnks5uyGXjgaJpZM4YiHCZ> .

[logicg8]

Yes. I've tried. I can only reproduce in Vanilla Eclipse 4.9 after installing the Spring Tools 4 plugin.

…

On Fri, Nov 23, 2018 at 3:58 PM Kris De Volder ***@***.***> wrote: Another question. Have you tried reproducing this on a Vanilla Eclipse 4.9? It seems likely this not specifically an STS bug. By trying it with a plain Eclipse this could be confirmed. If I could reproduce it myself, I would try Vanilla Eclipse myself, but since I am not yet able to reproduce it at all... — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#140 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAUsenbPFIR0C7E-sg3n2S61thiJn5OXks5uyG90gaJpZM4YiHCZ> .

[logicg8]

Thanks for looking into this. To answer your questions: - where exactly are we typing. Inside a class. See previous response. - are we typing existing package names, or new package names, or just whatever. Seems to be whatever. - are we keeping content assist active while typing. Yes. - are we keeping content assist active while backspacing. Yes - are we typing every letter or using content assist to complete (parts of) the package names I was able to reproduce with both. I will take some video and post.

…

On Fri, Nov 23, 2018 at 3:55 PM Kris De Volder ***@***.***> wrote: Can't reproduce this on Windows 10 either. I followed instructions to the letter. For the part where we type package name repeatedly I tried both in the place where we declare package, as well as in the class body. I didn't experience any ui freezes. If you can please add some details / clariication around exactly what I'm supposed to do for steps 7 and 8, that would be nice. For example: - where exactly are we typing - are we typing existing package names, or new package names, or just whatever. - are we keeping content assist active while typing. - are we keeping content assist active while backspacing. - are we typing every letter or using content assist to complete (parts of) the package names I did try a bit with different variations like that but no freezes / slowdowns where observed. Still, knowing exactly what it is you do might help and I could give it another. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#140 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAUselN1j_ElK0iCRm8n4NvmJ6F9R6Idks5uyG67gaJpZM4YiHCZ> .