Compiler error

[Kirill Prazdnikov]

Hi, I have a static method

public class PolygonEditor {
  public static void create(PropertyInspector inspector) {

    PropertyInspector.PropertyRollup rollup = inspector.createRollup("PolygonEditor");

    rollup.addButton("switch water on selected", () -> {
       Logger.log("string");
    });
  }

}

It compiles and works.

But when I do this :

if (false) rollup.addButton("switch water on selected", () -> {
  Logger.log("string");
});

I'm getting the following error, what can it be ?

[INFO] Caused by: java.lang.NullPointerException
[INFO] 	at com.google.gwt.dev.jjs.impl.Pruner.transformToNullMethodCall(Pruner.java:608)
[INFO] 	at com.google.gwt.dev.jjs.impl.Pruner$CleanupRefsVisitor.endVisit(Pruner.java:184)
[INFO] 	at com.google.gwt.dev.jjs.ast.JMethodCall.traverse(JMethodCall.java:268)
[INFO] 	at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:361)
[INFO] 	at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:273)
[INFO] 	... 32 more
[INFO]          [ERROR] at PolygonEditor.java(53): PolygonEditor.lambda$3()
[INFO]             com.google.gwt.dev.jjs.ast.JMethodCall
[INFO]          [ERROR] at PolygonEditor.java(53): PolygonEditor.lambda$3()
[INFO]             com.google.gwt.dev.jjs.ast.JExpressionStatement
[INFO]          [ERROR] at PolygonEditor.java(53): {
[INFO]   PolygonEditor.lambda$3();
[INFO] }
[INFO]             com.google.gwt.dev.jjs.ast.JBlock
[INFO]          [ERROR] at PolygonEditor.java(53): {
[INFO]   PolygonEditor.lambda$3();
[INFO] }
[INFO]             com.google.gwt.dev.jjs.ast.JMethodBody
[INFO]          [ERROR] at PolygonEditor.java(53): delightex.client.editors.PolygonEditor$lambda$3$Type.run()V
[INFO]             com.google.gwt.dev.jjs.ast.JMethod
[INFO]          [ERROR] at PolygonEditor.java(53): delightex.client.editors.PolygonEditor$lambda$3$Type (final extends Object implements Runnable)
[INFO]             com.google.gwt.dev.jjs.ast.JClassType
[INFO]       [ERROR] Unrecoverable exception, shutting down

[Kirill Prazdnikov]

It seems like it is a java.lang.NullPointerException in the compiler

  at com.google.gwt.dev.jjs.impl.Pruner.transformToNullMethodCall(Pruner.java:608)

[Jens]

Create a small, self contained example that reproduces the problem and open a bug on Github. Looks like a compiler bug.

-- J.