Hans Grimmelshausen created NETBEANS-3919:
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Summary: NB editor Null-pointer exception because of javac hints,
with non-installed nb-javac plug-in
Key: NETBEANS-3919
URL: https://issues.apache.org/jira/browse/NETBEANS-3919
Project: NetBeans
Issue Type: Bug
Components: editor - Hints & Annotations, editor - Parsing &
Indexing
Affects Versions: 11.2, 11.0, 11.3
Environment: Netbeans 11.2 and 11.3_beta
Ubuntu 18.04 LTS
OpenJDK 11.0.6 2020-01-14 (via apt-get installed)
Reporter: Hans Grimmelshausen
Attachments: Nullpointer-javac-hints.txt
Short description: In NB 11.2, with uninstalled nb-javac plug-in and enabled
"Overrides" editor hint, whilst editing a Java source file containing
"Overrides" situations, a few seconds later NB raises a Null-pointer exception.
Please see attached stacktrace.
How to reproduce the bug step by step:
1) I use Netbeans Ant projects with Java 11 source-format, but the bug could
also happen with other project types.
2) When NB asks to install nb-javac plugin, don't install it. In case it's
already installed, un-install it. With enabled nb-javac plugin, the
Null-pointer exception bug doesn't happen. (Also the refactoring-rename only
works fully with an non-installed nb-javac plug-in.)
3) In NB's menu Tools -> Options -> Editor -> Hints -> Java, in section
"Standard javac warnings", enable the "Overrides" checkbox.
4) Create a simple mini Java source file with offending source code lines, like:
{code:java}
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JCheckBox;
public class Test {
public static void main(String[] parameter) {
JCheckBox jChecker = new JCheckBox();
jChecker.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
}
});
}
}{code}
5) Now whenever we edit some of the code in the source file, a few seconds
later, when NB's parser wants to check the source code for potential
"Overrides" hint situations, it raises the red Null-pointer exception
notification.
7) Work-around: Disable the "Overrides" checkbox in the NB editor's hints
section.
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