Can't compile GWT app using 2.8.0-SNAPSHOT and Java 8 with gwt-maven-plugin

I am struggling to get my app to compile using GWT 2.8.0-SNAPSHOT and Mojo's gwt-maven-plugin 2.8.0-SNAPSHOT

I receive the same compiler errors each time:

[INFO] --- gwt-maven-plugin:2.8.0-SNAPSHOT:compile (default) @ UsavAppV7 ---
[ERROR] Jul 20, 2016 9:34:23 AM java.util.prefs.WindowsPreferences <init>
[ERROR] WARNING: Could not open/create prefs root node Software\JavaSoft\Prefs at root 0x80000002. Windows RegCreateKeyEx(...) returned error code 5.
[INFO] Compiling module com.utilitiessavings.usavappv7.Project
[INFO]    [ERROR] An internal compiler exception occurred
[INFO] com.google.gwt.dev.jjs.InternalCompilerException: Unexpected error during visit.
[INFO]  at com.google.gwt.dev.jjs.ast.JVisitor.translateException(JVisitor.java:111)
[INFO]  at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:276)
[INFO]  at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:265)
[INFO]  at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:118)
[INFO]  at com.google.gwt.dev.jjs.ast.JDeclarationStatement.traverse(JDeclarationStatement.java:49)
[INFO]  at com.google.gwt.dev.jjs.ast.JModVisitor$ListContext.traverse(JModVisitor.java:88)
[INFO]  at com.google.gwt.dev.jjs.ast.JModVisitor.acceptWithInsertRemove(JModVisitor.java:331)
[INFO]  at com.google.gwt.dev.jjs.ast.JBlock.traverse(JBlock.java:92)
[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]  at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:139)
[INFO]  at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:135)
[INFO]  at com.google.gwt.dev.jjs.ast.JMethodBody.traverse(JMethodBody.java:83)
[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]  at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:265)
[INFO]  at com.google.gwt.dev.jjs.ast.JMethod.visitChildren(JMethod.java:785)
[INFO]  at com.google.gwt.dev.jjs.ast.JMethod.traverse(JMethod.java:777)
[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]  at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:265)
[INFO]  at com.google.gwt.dev.jjs.impl.UnifyAst.mainLoop(UnifyAst.java:1379)
[INFO]  at com.google.gwt.dev.jjs.impl.UnifyAst.exec(UnifyAst.java:875)
[INFO]  at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.unifyJavaAst(JavaToJavaScriptCompiler.java:1410)
[INFO]  at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.constructJavaAst(JavaToJavaScriptCompiler.java:1222)
[INFO]  at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.precompile(JavaToJavaScriptCompiler.java:1140)
[INFO]  at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.precompile(JavaToJavaScriptCompiler.java:255)
[INFO]  at com.google.gwt.dev.Precompile.precompile(Precompile.java:255)
[INFO]  at com.google.gwt.dev.Precompile.precompile(Precompile.java:202)
[INFO]  at com.google.gwt.dev.Precompile.precompile(Precompile.java:143)
[INFO]  at com.google.gwt.dev.Compiler.compile(Compiler.java:204)
[INFO]  at com.google.gwt.dev.Compiler.compile(Compiler.java:155)
[INFO]  at com.google.gwt.dev.Compiler.compile(Compiler.java:144)
[INFO]  at com.google.gwt.dev.Compiler$1.run(Compiler.java:118)
[INFO]  at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:55)
[INFO]  at com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:50)
[INFO]  at com.google.gwt.dev.Compiler.main(Compiler.java:125)
[INFO] Caused by: java.lang.AbstractMethodError: org.apache.xerces.dom.ElementNSImpl.setUserData(Ljava/lang/String;Ljava/lang/Object;Lorg/w3c/dom/UserDataHandler;)Ljava/lang/Object;
[INFO]  at com.google.gwt.uibinder.rebind.W3cDocumentBuilder.startElement(W3cDocumentBuilder.java:127)
[INFO]  at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
[INFO]  at org.apache.xerces.impl.dtd.XMLDTDValidator.startElement(Unknown Source)
[INFO]  at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
[INFO]  at org.apache.xerces.impl.XMLNSDocumentScannerImpl$NSContentDispatcher.scanRootElementHook(Unknown Source)
[INFO]  at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
[INFO]  at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
[INFO]  at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
[INFO]  at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
[INFO]  at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
[INFO]  at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
[INFO]  at javax.xml.parsers.SAXParser.parse(SAXParser.java:392)
[INFO]  at com.google.gwt.uibinder.rebind.W3cDomHelper.documentFor(W3cDomHelper.java:74)
[INFO]  at com.google.gwt.uibinder.rebind.UiBinderGenerator.getW3cDoc(UiBinderGenerator.java:208)
[INFO]  at com.google.gwt.uibinder.rebind.UiBinderGenerator.generateOnce(UiBinderGenerator.java:183)
[INFO]  at com.google.gwt.uibinder.rebind.UiBinderGenerator.generate(UiBinderGenerator.java:128)
[INFO]  at com.google.gwt.core.ext.IncrementalGenerator.generateNonIncrementally(IncrementalGenerator.java:40)
[INFO]  at com.google.gwt.dev.javac.StandardGeneratorContext.runGeneratorIncrementally(StandardGeneratorContext.java:745)
[INFO]  at com.google.gwt.dev.cfg.RuleGenerateWith.realize(RuleGenerateWith.java:103)
[INFO]  at com.google.gwt.dev.shell.StandardRebindOracle$Rebinder.rebind(StandardRebindOracle.java:78)
[INFO]  at com.google.gwt.dev.shell.StandardRebindOracle.rebind(StandardRebindOracle.java:262)
[INFO]  at com.google.gwt.dev.shell.StandardRebindOracle.rebind(StandardRebindOracle.java:251)
[INFO]  at com.google.gwt.dev.PrecompilationContextCreator$1.getAllPossibleRebindAnswers(PrecompilationContextCreator.java:86)
[INFO]  at com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.createStaticRebindExpression(UnifyAst.java:493)
[INFO]  at com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.createRebindExpression(UnifyAst.java:463)
[INFO]  at com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.handleMagicMethodCall(UnifyAst.java:588)
[INFO]  at com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.endVisit(UnifyAst.java:293)
[INFO]  at com.google.gwt.dev.jjs.ast.JMethodCall.traverse(JMethodCall.java:268)
[INFO]  at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:361)
[INFO]  at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:273)
[INFO]  ... 35 more
[INFO]       [ERROR] at com_gwtplatform_mvp_client_DesktopGinjector_DesktopGinjectorGinjector_fragment.java(132): GWT.create(ApplicationView$Binder.class)
[INFO]          com.google.gwt.dev.jjs.ast.JMethodCall
[INFO]       [ERROR] at com_gwtplatform_mvp_client_DesktopGinjector_DesktopGinjectorGinjector_fragment.java(132): Object created = GWT.create(ApplicationView$Binder.class)
[INFO]          com.google.gwt.dev.jjs.ast.JDeclarationStatement
[INFO]       [ERROR] at com_gwtplatform_mvp_client_DesktopGinjector_DesktopGinjectorGinjector_fragment.java(131): {
[INFO]   Object created = GWT.create(ApplicationView$Binder.class);
[INFO]   assert created instanceof ApplicationView$Binder;
[INFO]   ApplicationView$Binder result = (ApplicationView$Binder) created;
[INFO]   this.memberInject_Key$type$com$utilitiessavings$usavappv7$client$application$ApplicationView$Binder$_annotation$$none$$(result);
[INFO]   return result;
[INFO] }
[INFO]          com.google.gwt.dev.jjs.ast.JBlock
[INFO]       [ERROR] at com_gwtplatform_mvp_client_DesktopGinjector_DesktopGinjectorGinjector_fragment.java(131): {
[INFO]   Object created = GWT.create(ApplicationView$Binder.class);
[INFO]   assert created instanceof ApplicationView$Binder;
[INFO]   ApplicationView$Binder result = (ApplicationView$Binder) created;
[INFO]   this.memberInject_Key$type$com$utilitiessavings$usavappv7$client$application$ApplicationView$Binder$_annotation$$none$$(result);
[INFO]   return result;
[INFO] }
[INFO]          com.google.gwt.dev.jjs.ast.JMethodBody
[INFO]       [ERROR] at com_gwtplatform_mvp_client_DesktopGinjector_DesktopGinjectorGinjector_fragment.java(131): com.utilitiessavings.usavappv7.client.application.com_gwtplatform_mvp_client_DesktopGinjector_DesktopGinjectorGinjector_fragment.get_Key$type$com$utilitiessavings$usavappv7$client$application$ApplicationView$Binder$_annotation$$none$$()Lcom/utilitiessavings/usavappv7/client/application/ApplicationView$Binder;
[INFO]          com.google.gwt.dev.jjs.ast.JMethod
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 02:38 min
[INFO] Finished at: 2016-07-20T09:34:52+01:00
[INFO] Final Memory: 65M/534M

I don't know whether this is a problem with Java 8, GWT, or GWTP.

Any advice on how to investigate further or what could be causing it would be appreciated.

Edit:

pom.xml (snippets)

<properties>
    <!-- client -->
    <gwt.version>2.8.0-SNAPSHOT</gwt.version>
    <gwtp.version>1.5.1</gwtp.version>
    <gin.version>2.1.2</gin.version>

    <gwtbootstrap3.version>0.9.3</gwtbootstrap3.version>
    <gwtbootstrap3-extras.version>0.9.2</gwtbootstrap3-extras.version>

    <gwt-log.version>3.3.2</gwt-log.version>

    <!-- server -->
    <gae.version>1.9.38</gae.version>
    <guice.version>4.1.0</guice.version>
    <objectify.version>5.1.13</objectify.version>

    <persistence-api.version>1.0.2</persistence-api.version>
    <servlet-api.version>2.5</servlet-api.version>
    <javax.validation.version>1.0.0.GA</javax.validation.version>
    <hibernate-validator.version>4.1.0.Final</hibernate-validator.version>
    <slf4j.version>1.7.9</slf4j.version>
    <jackson.version>2.7.0-rc2</jackson.version>

    <guava-version>20.0-SNAPSHOT</guava-version>

    <!-- testing -->
    <junit.version>4.12</junit.version>
    <jukito.version>1.4.1</jukito.version>
    <cucumber.version>1.2.4</cucumber.version>

    <!-- maven -->
    <gwt-maven-plugin.version>2.8.0-SNAPSHOT</gwt-maven-plugin.version>
    <maven-surefire-plugin.version>2.18.1</maven-surefire-plugin.version>
    <maven-compiler-plugin.version>3.3</maven-compiler-plugin.version>
    <maven-resources-plugin.version>2.5</maven-resources-plugin.version>
    <maven-processor-plugin.version>2.0.5</maven-processor-plugin.version>
    <maven-build-helper-plugin.version>1.10</maven-build-helper-plugin.version>

    <target.jdk>1.8</target.jdk>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

    <webappDirectory>${project.build.directory}/${project.build.finalName}</webappDirectory>

    <gae.home>${settings.localRepository}/com/google/appengine/appengine-java-sdk/${gae.version}</gae.home>
    <mvn.gae.home>
        ${settings.localRepository}/com/google/appengine/appengine-java-sdk/${gae.version}/appengine-java-sdk/appengine-java-sdk-${gae.version}
    </mvn.gae.home>

</properties>

<build>

    <outputDirectory>${webappDirectory}/WEB-INF/classes</outputDirectory>

    <resources>
        <resource>
            <directory>src/main/resources</directory>
        </resource>
        <resource>
            <directory>src/main/super</directory>
        </resource>
        <resource>
            <directory>${project.build.directory}/generated-sources/apt</directory>
        </resource>
        <resource>
            <directory>${project.build.directory}/generated-sources/gwt</directory>
        </resource>
    </resources>

    <plugins>

        <plugin>
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>versions-maven-plugin</artifactId>
            <version>2.2</version>
            <executions>
                <execution>
                    <phase>validate</phase>
                    <goals>
                        <goal>display-dependency-updates</goal>
                        <goal>display-plugin-updates</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>${maven-compiler-plugin.version}</version>
            <configuration>
                <source>${target.jdk}</source>
                <target>${target.jdk}</target>
                <encoding>${project.build.sourceEncoding}</encoding>
                <proc>none</proc>
            </configuration>
        </plugin>

        <!-- GWT -->
        <!-- 'mvn gwt:run' - runs development mode -->
        <!-- 'mvn gwt:debug' - runs debug mode -->
        <!-- 'mvn gwt:compile' - compiles gwt -->
        <!-- 'mvn integration-test' - runs the gwt tests (*GwtTest.java) -->
        <plugin>
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>gwt-maven-plugin</artifactId>
            <version>${gwt-maven-plugin.version}</version>

            <configuration>
                <strict>true</strict>
                <testTimeOut>180</testTimeOut>
                <mode>htmlunit</mode>
                <logLevel>INFO</logLevel>
                <style>PRETTY</style>

                <copyWebapp>true</copyWebapp>
                <hostedWebapp>${webappDirectory}</hostedWebapp>
                <server>com.google.appengine.tools.development.gwt.AppEngineLauncher</server>
                <appEngineVersion>${gae.version}</appEngineVersion>
                <extraJvmArgs>-Ddatastore.default_high_rep_job_policy_unapplied_job_pct=20 -Xmx2g -Dappengine.sdk.root=${mvn.gae.home}
                </extraJvmArgs>
                <port>8888</port>
                <incremental>false</incremental>
                <bindAddress>0.0.0.0</bindAddress>
                <runTarget>Project.html</runTarget>
                <modules>
                    <module>com.utilitiessavings.usavappv7.Project</module>
                </modules>
            </configuration>

            <executions>
                <execution>
                    <goals>
                        <goal>compile</goal>
                        <goal>test</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>

        <plugin>
            <groupId>com.google.appengine</groupId>
            <artifactId>gcloud-maven-plugin</artifactId>
            <configuration>
                <verbosity>info</verbosity>
                <runtime>java</runtime>
            </configuration>
            <version>2.0.9.106.v20160420</version>
        </plugin>

Libraries

• Java 1.8.0_92
• Maven 3.3.9
• GWT 2.8.0-SNAPSHOT
• GWTP 1.5.1
• Guava 20.0-SNAPSHOT
• Guice 4.1.0
• Gin 2.1.2

Upgrading my own comment to an answer.

I discovered the library excel-streaming-reader had a dependency on xercesImpl 2.4.0 (from 2006).

I declared an additional dependency to 2.11.0 to solve the issue:

<dependency>
    <groupId>xerces</groupId>
    <artifactId>xercesImpl</artifactId>
    <version>2.11.0</version>
</dependency>

I have notified the owner of the problem. Github issue: https://github.com/monitorjbl/excel-streaming-reader/issues/44