Gradle upgrade to 5.4 causes build failure

[sandeep-khanna]

Environment

Java

openjdk 11.0.3 2019-04-16
OpenJDK Runtime Environment (build 11.0.3+7-Ubuntu-1ubuntu219.04.1)
OpenJDK 64-Bit Server VM (build 11.0.3+7-Ubuntu-1ubuntu219.04.1, mixed mode, sharing)

GWT

2.8.2

GWT Gradle Plugin

0.6

Receiving the following error after upgrading Gradle from version 4.8.1 to 5.4.1

java.lang.NoSuchMethodError: org.gradle.api.tasks.SourceSetOutput.getClassesDir()Ljava/io/File;
10:12:21.117 [ERROR] [org.gradle.internal.buildevents.BuildExceptionReporter]   at de.richsource.gradle.plugins.gwt.GwtBasePlugin$5$3.call(GwtBasePlugin.java:263)
10:12:21.117 [ERROR] [org.gradle.internal.buildevents.BuildExceptionReporter]   at de.richsource.gradle.plugins.gwt.GwtBasePlugin$5$3.call(GwtBasePlugin.java:260)
10:12:21.117 [ERROR] [org.gradle.internal.buildevents.BuildExceptionReporter]   at org.gradle.util.GUtil.uncheckedCall(GUtil.java:459)
10:12:21.118 [ERROR] [org.gradle.internal.buildevents.BuildExceptionReporter]   at org.gradle.internal.extensibility.ConventionAwareHelper$2.doGetValue(ConventionAwareHelper.java:77)
10:12:21.118 [ERROR] [org.gradle.internal.buildevents.BuildExceptionReporter]   at org.gradle.internal.extensibility.ConventionAwareHelper$MappedPropertyImpl.getValue(ConventionAwareHelper.java:121)
10:12:21.118 [ERROR] [org.gradle.internal.buildevents.BuildExceptionReporter]   at org.gradle.internal.extensibility.ConventionAwareHelper.getConventionValue(ConventionAwareHelper.java:104)
10:12:21.118 [ERROR] [org.gradle.internal.buildevents.BuildExceptionReporter]   at de.richsource.gradle.plugins.gwt.GwtCompile_Decorated.getClasspath(Unknown Source)
10:12:21.119 [ERROR] [org.gradle.internal.buildevents.BuildExceptionReporter]   at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

Is the solution some local workaround or an update to the gwt-gradle-plugin?

[jnehlmeier]

This project is unmaintained. The method SourceSetOutput.getClassesDir() has been deprecated in Gradle 4.x and removed in Gradle 5.x. Thus you see the error.

In case you want to fix the plugin yourself, the code should use SourceSetOutput.getClassesDirs().

[sandeep-khanna]

Understood that the project is unmaintained. I agree with your code fix and was trying to set this up locally and ran in to other Gradle build issues while trying to upgrade from Gradle version 2.4 to 5.4.1

Should I submit a merge/pull request with the code change or is there another GWT Gradle plugin that you would recommend using?

[jnehlmeier]

I guess these should work with Gradle 5:

https://github.com/jiakuan/gwt-gradle-plugin
https://github.com/Putnami/putnami-gradle-plugin

The first one is a direct fork of this project and fixed some stuff.