[jira] [Created] (NETBEANS-4049) UnsupportedClassVersionError when running JDK14 code with --enable-preview

["Rick Hegarty (Jira)" <ji...@apache.org>]

Rick Hegarty created NETBEANS-4049:
--------------------------------------

             Summary: UnsupportedClassVersionError when running JDK14 code with --enable-preview
                 Key: NETBEANS-4049
                 URL: https://issues.apache.org/jira/browse/NETBEANS-4049
             Project: NetBeans
          Issue Type: Bug
          Components: platform - Execution, platform - Options&Settings
    Affects Versions: 11.3
         Environment: Product Version: Apache NetBeans IDE 11.3
Java: 14; OpenJDK 64-Bit Server VM 14+36-1461
Runtime: OpenJDK Runtime Environment 14+36-1461
System: Windows 10 version 10.0 running on amd64; Cp1252; en_US (nb)
User directory: C:\Users\johndoe\AppData\Roaming\NetBeans\11.3
Cache directory: C:\Users\johndoe\AppData\Local\NetBeans\Cache\11.3
            Reporter: Rick Hegarty
         Attachments: nb113enablePreview.png

I have installed NB 11.3 on Windows 10, with JDK 14 as its only Java platform.

I created a simple _Java with Ant_ project, and wrote code using "arrow case" labels in a switch block:

 
{code:java}
static boolean isModifiable(char c) {
    boolean canModify = switch (c) {
        case 'ñ', 'Ñ' ->
            false;
        default ->
            true;
    };
    return canModify;
 }
{code}
 

NetBeans detected that this was a JEP 354 preview feature, and set *--enable-preview* for compilation (_Properties > Build > Compiling > Additional Compiler Options_) and execution (_Properties > Run > VM Options_).

The code compiled with no problems, but running it (_Run > Run Project_) resulted in this error:

 
{code:java}
run:
Error: LinkageError occurred while loading main class com.Diacritics java.lang.UnsupportedClassVersionError: com/Diacritics (class file version 57.65535) was compiled with preview features that are unsupported. This version of the Java Runtime only recognizes preview features for class file version 58.65535
C:\Users\johndoe\AppData\Local\NetBeans\Cache\11.3\executor-snippets\run.xml:111: The following error occurred while executing this line:
C:\Users\johndoe\AppData\Local\NetBeans\Cache\11.3\executor-snippets\run.xml:68: Java returned: 1
BUILD FAILED (total time: 0 seconds)
{code}
When I build the project the message is logged 
{code:java}
To run this application from the command line without Ant, try:
java -jar "D:\NB113\Diacritics\dist\Diacritics.jar"{code}
If I run from the command line with JDK 14 on the *PATH*, using what NetBeans proposes (i.e. *java -jar "D:\NB113\Diacritics\dist\Diacritics.jar"*) I also get the linkage error described above. However, when I added the *--enable-preview* option to the command line call it works fine, as shown in this screen shot:

!nb113enablePreview.png!

This suggests that when running the project within NetBeans the _VM Option_ *--enable-preview* is being ignored.

There is no issue when creating a Java application using _Java with Maven_ that contains the same code. This is only an issue for _Java with Ant_ projects.

 



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