Rick Hegarty created NETBEANS-4049:
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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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