Compile Error with GWT 2.8

[mgoerdes]

Hi, with GWT 2.8-SNAPSHOT (not Beta1) I currently get the following compile error:

[INFO] Compiling module com.bearingpoint.davinci.gui.Banking [INFO] Errors in com/github/gwtd3/api/core/Value.java [INFO] [ERROR] Line 249: Method 'boolean Boolean.booleanValue()' is implemented by devirtualized type 'Boolean' JSO and can only be used in calls within a JSNI method body.

Is there a chance to fix it? BR, Mark

[ericcitaire]

Hi Mark,

gwt-d3 latest release is not GWT 2.8 compatible. @anthonime has made some changes in the branch gwt2.8 to make it compatible.

It hasn't been released yet mostly because of Google App Engine (our demo host) was not java 8 compatible. AFAIK, this is still the case.

Feel free to try this branch in your project and give us feedback.

Cheers, Eric.

[johnthuss]

I tried the gwt2.8 branch (after rebasing on master). This particular error is not fixed yet on the gwt2.8 branch when compiling against gwt-2.8.0-rc1 which was released a few days ago (July 29).

If I just remove the problem line (well, two lines), everything seems to work ok, but I'm not positive that this is the right change.

[michael-newsrx]

This issue still exists for GWT 2.8.0-RC2. I don't understand why the backend should require java 1.8, the stuff is compiled to js and runs in the browser?

[mgoerdes]

I did not have time to check the GWT 2.8 related snapshot but I assume that the above issue relates to the following (see also GWT 2.8.0-RC1 Release notes): JSNI disallows method references to Double, String, Boolean and its super types: https://github.com/gwtproject/gwt/issues/9356.

`/**

• @return true if the value is a Javascript boolean value, a Javascript Boolean object or a Java {@link Boolean}
• instance. / public final native boolean isBoolean()/-{ return typeof (this.datum) === "boolean" || this.datum instanceof Boolean || (this.datum != null && this.datum .@java.lang.Boolean::booleanValue() != null); }-*/;`

As this code is also available in the GWT 2.8 enabled branch I assume that we are facing the same issue. GWT 2.8. beta1 will be ok, GWT 2.8. rc1 and rc2 not.

[michael-newsrx]

Yeah... we had to backtrack on our update to RC2 here and go back
  to BETA1, even with latest snapshot pulled via jitpack.io

On 08/17/2016 10:00 AM, Mark Gördes
  wrote:

  I did not have time to check the GWT 2.8 related snapshot but I
    assume that the above issue relates to the following (see also
    GWT 2.8.0-RC1 Release notes): JSNI disallows method references
    to Double, String, Boolean and its super types: gwtproject/gwt#9356.
    The code
  /**
      * @return true if the value is a Javascript boolean value, a
      Javascript Boolean object or a Java {@link Boolean}
      * instance.
      */
      public final native boolean isBoolean()/*-{
      return typeof (this.datum) === "boolean"
      || this.datum instanceof Boolean
      || (this.datum != null && this.datum
      .@java.lang.Boolean::booleanValue() != null);
      }-*/;
  As this code is also available in the GWT 2.8. branch I assume
    that we are facing the same issue? GWT 2.8. beta1 will be ok,
    GWT 2.8. rc1 and rc2 not.
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[xamde]

AppEngine supports Java 8 now (for some time); Can we upgrade to GWT 2.8 (and maybe also to D3 4.x)?