Manifold Properties don't compile with JDK 16

Describe the bug I am trying to compile my project on IntelliJ IDEA with maven, I’m using JDK 16 and everything goes fine till I added manifold properties dependency

<dependency>
    <groupId>systems.manifold</groupId>
    <artifactId>manifold-props-rt</artifactId>
    <version>${manifold.version}</version>
</dependency>

and related plugin path.

The error is the following:

java.lang.NoSuchMethodError: 'boolean com.sun.tools.javac.code.Symbol.isLocal()'
        at manifold.ext.props.Util.isPropertyField(Util.java:160)
        at manifold.ext.props.PropertyInference.handleExistingField(PropertyInference.java:419)
        at manifold.ext.props.PropertyInference.makeVal(PropertyInference.java:274)
        at manifold.ext.props.PropertyInference.handleVals(PropertyInference.java:217)
        at manifold.ext.props.PropertyInference.inferProperties(PropertyInference.java:74)
        at manifold.ext.props.PropertyProcessor.inferPropertiesFromClassReader(PropertyProcessor.java:156)
        at manifold.ext.props.ClassReaderCompleter.lambda$complete$1(ClassReaderCompleter.java:132)
        at jdk.compiler/com.sun.tools.javac.comp.Annotate.flush(Annotate.java:191)
        at jdk.compiler/com.sun.tools.javac.comp.Annotate.unblockAnnotations(Annotate.java:144)
        at jdk.compiler/com.sun.tools.javac.comp.Annotate.enterDone(Annotate.java:157)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.enterDone(JavaCompiler.java:1750)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.enterTrees(JavaCompiler.java:1071)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:936)
        at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:317)
        at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:176)
        at jdk.compiler/com.sun.tools.javac.Main.compile(Main.java:64)
        at jdk.compiler/com.sun.tools.javac.Main.main(Main.java:50)

To Reproduce Steps to reproduce the behavior:

1. Create a new maven project
2. Add manifold properties plugin dependency
3. Add a class with at least a @var
4. Compile, you will get a generic error (execute mvn clean install -X to see error details )

Expected behavior Compile of @var fields is performed correctly.

Desktop (please complete the following information):

• OS Type & Version: macOS Catalina
• Java/JDK version: JDK 16 (X)
• IDE version (IntelliJ IDEA or Android Studio): IntelliJ IDEA 2020.3.2, here some informations about it:

IntelliJ IDEA 2020.3.2 (Ultimate Edition)
Build #IU-203.7148.57, built on January 26, 2021
Licensed to Alessandro Muzzi
Subscription is active until December 28, 2021.
For educational use only.
Runtime version: 11.0.9.1+11-b1145.77 x86_64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.
macOS 10.15.3
GC: ParNew, ConcurrentMarkSweep
Memory: 1981M
Cores: 8
Registry: actionSystem.force.alt.gr=true
Non-Bundled Plugins: manifold.ij, Dart, org.jetbrains.kotlin

• Manifold version: 2021.1.9
• Manifold IntelliJ plugin version: 2020.3.39

Stack trace Already applied in description.

[AleMuzzi]

Oh, ok, I’ll keep it in mind, thanks.

[AleMuzzi]

I’m really glad to hear that! I’ve just tested the new version with JDK 16 and it works like a charm. The only thing I noticed is that just changing the plugin version in pom.xml led to a build success but the IDE still kept reporting error in files containing @var. After I have performed an uninstall and a reinstall of the plugin everything worked fine. Thanks for the fast fix! I’m glad I have helped you, you’re doing an awesome job, this plugin is a game changing in Java programming.