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https://issues.apache.org/jira/browse/NETBEANS-4073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17130364#comment-17130364
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Klaus Ahrenberg commented on NETBEANS-4073:
-------------------------------------------
Ok, the following hint at
[http://netbeans.apache.org/download/nb120/index.html]
was the right one:
{quote}In these scenarios, make sure to uninstall the NetBeans "nb-javac" fork,
if it is installed, and to not install it when prompted to do so.
{quote}
After I uninstalled the nb-javac module, Netbeans do not mark files with
preview features as "files with error".
Thanks for the help. Topic can be closed.
> JDK14 features still declared as preview (e.g. switch) - Project contains
> "file with errors"
> --------------------------------------------------------------------------------------------
>
> Key: NETBEANS-4073
> URL: https://issues.apache.org/jira/browse/NETBEANS-4073
> Project: NetBeans
> Issue Type: Bug
> Components: ide - Code, platform - JDK Problems
> Affects Versions: 11.3
> Environment: Manjaro Linux, JDK14, NB11.3
> Reporter: Klaus Ahrenberg
> Priority: Trivial
> Labels: 11.3, 12.0, jdk14, preview-features
> Attachments: switch_expression.png
>
>
> With configuration NB11.2 and JDK13 I used the flag --enable-preview to use
> the new switch command for example. In JDK14 the new switch command is not
> longer a preview feature, it's implemented in the JDK now.
> However, in NB11.3 and JDK14 I cannot use the --enable-preview flag.
> Running/compiling with this flag results in error. If I remove the flag,
> application is compiling and running in JDK14.
> The Netbeans IDE itself shows in the project still "files with errors" and at
> every program run it displays the message "project still has failures.
> Continue?". If I look at the marked files with error, it shows me the files
> where the new switch command is used. The hint is "Use --enable-preview flag"
> which can not be used anymore.
> To reproduce:
> - Create Java App - Source level and JDK version 14
> - Use new switch statement in code
>
> {{switch (b) {}}
> {{ case 1 -> System.out.println("1");}}
> {{ default -> System.out.println("other");}}
> {{}}}
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