Maven Plugin for GWT: "An internal error occurred during: "BBj - GWT Compile". Model not available for BBj"

I was able to get a Java 11 / Eclipse 2019-06 development environment building my GWT project with Maven Plugin for GWT a few months ago, but the GWT compile stopped working after updating to Eclipse 2019-06 today, and the error message doesn't give me much to work with. Any idea what this is trying to tell me?

An internal error occurred during: "BBj - GWT Compile".

Model not available for BBj

Here's the pom.xml file for my BBj package:

<project xmlns="http://maven.apache.org/POM/4.0.0"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

<modelVersion>4.0.0</modelVersion>

<groupId>BBj</groupId>

<artifactId>BBj</artifactId>

<version>19.20-SNAPSHOT</version>

    <packaging>gwt-app</packaging>

<dependencyManagement>

<dependencies>

<dependency>

<groupId>com.google.gwt</groupId> 

<artifactId>gwt</artifactId>

<version>2.8.2</version>

<type>pom</type>

<scope>import</scope>

</dependency>

</dependencies>

</dependencyManagement>

<dependencies>

<dependency>

<groupId>com.google.gwt</groupId>

<artifactId>gwt-user</artifactId>

</dependency>

<dependency>

<groupId>com.google.gwt</groupId>

<artifactId>gwt-dev</artifactId>

<exclusions>

<exclusion>

<groupId>xml-apis</groupId>

<artifactId>xml-apis</artifactId>

</exclusion>

<exclusion>

<groupId>net.sourceforge.htmlunit</groupId>

<artifactId>htmlunit</artifactId>

</exclusion>

</exclusions>

</dependency>

</dependencies>

<build>

<sourceDirectory>src</sourceDirectory>

<resources>

<resource>

<directory>src</directory>

<excludes>

<exclude>**/*.java</exclude>

</excludes>

</resource>

<resource>

<directory>.apt_generated</directory>

<excludes>

<exclude>**/*.java</exclude>

</excludes>

</resource>

</resources>

<plugins>

<plugin>

<artifactId>maven-compiler-plugin</artifactId>

<version>3.8.0</version>

<configuration>

<release>11</release>

</configuration>

</plugin>

<plugin>

<groupId>net.ltgt.gwt.maven</groupId>

<artifactId>gwt-maven-plugin</artifactId>

<version>1.0-rc-10</version>

<extensions>true</extensions>

<configuration>

<moduleName>com.basis.bbj.web.gwt.GWTWebClient</moduleName>

                    <outputDirectory>war/WEB-INF/classes</outputDirectory>

</configuration>

</plugin>

</plugins>

</build>

</project>

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