GWT 2.8.2 and Jetty Embedded - com.google.gwt.dev.jjs.InternalCompilerException: Error constructing Java AST

I've got a real simple scaled down GWT application (to illustrate the issue) with Jetty Embedded Server (9.4.7.v20170914), it can be downloaded here:

This works fine when running under 2.7.0.  

Unfortunately, when I upgrade to 2.8.2, I'm getting an error during the GWT compilation stage.   See below.

Any suggestions in how I can fix this?   It seems like there is a conflict between Jetty deps and GWT 2.8.2 deps and I probably need some kind of exclude,

but I'm not super familiar with maven enough to tell it how to exclude what it needs so this compiles.  The simple application be be downloaded from:

https://www.dropbox.com/s/1myj5o3dpq9bzxt/gwt_jetty.zip?dl=0

Really appreciate any help in this.

Thanks,

Chris

Here is the GWTC output:

--- gwt-maven-plugin:2.8.2:compile (default) @ my-app ---

[INFO] Compiling module com.mycompany.app.MyWebApp

[INFO] [ERROR] An internal compiler exception occurred

[INFO] com.google.gwt.dev.jjs.InternalCompilerException: Error constructing Java AST

[INFO] at com.google.gwt.dev.jjs.impl.GwtAstBuilder.translateException(GwtAstBuilder.java:3997)

[INFO] at com.google.gwt.dev.jjs.impl.GwtAstBuilder$AstVisitor.endVisit(GwtAstBuilder.java:1569)

[INFO] at org.eclipse.jdt.internal.compiler.ast.MessageSend.traverse(MessageSend.java:1021)

[INFO] at org.eclipse.jdt.internal.compiler.ast.Assignment.traverse(Assignment.java:260)

[INFO] at org.eclipse.jdt.internal.compiler.ast.Block.traverse(Block.java:136)

[INFO] at org.eclipse.jdt.internal.compiler.ast.IfStatement.traverse(IfStatement.java:281)

[INFO] at org.eclipse.jdt.internal.compiler.ast.MethodDeclaration.traverse(MethodDeclaration.java:347)

[INFO] at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.traverse(TypeDeclaration.java:1379)

[INFO] at com.google.gwt.dev.jjs.impl.GwtAstBuilder.processImpl(GwtAstBuilder.java:3933)

[INFO] at com.google.gwt.dev.jjs.impl.GwtAstBuilder.process(GwtAstBuilder.java:3971)

Here is what my dependency tree looks like this:

 mvn dependency:tree -Dverbose=true

[INFO] Scanning for projects...

[WARNING] 

[WARNING] Some problems were encountered while building the effective model for com.mycompany.app:my-app:jar:1.0-SNAPSHOT

[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-resources-plugin is missing. @ line 173, column 21

[WARNING] 

[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.

[WARNING] 

[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.

[WARNING] 

[INFO] 

[INFO] ------------------------------------------------------------------------

[INFO] Building Maven Archetype for GWT 1.0-SNAPSHOT

[INFO] ------------------------------------------------------------------------

[INFO] 

[INFO] --- maven-dependency-plugin:2.8:tree (default-cli) @ my-app ---

[INFO] com.mycompany.app:my-app:jar:1.0-SNAPSHOT

[INFO] +- junit:junit:jar:4.11:test

[INFO] |  \- org.hamcrest:hamcrest-core:jar:1.3:test

[INFO] +- org.eclipse.jetty:jetty-server:jar:9.4.7.v20170914:compile

[INFO] |  +- javax.servlet:javax.servlet-api:jar:3.1.0:compile

[INFO] |  +- org.eclipse.jetty:jetty-http:jar:9.2.14.v20151106:compile (version managed from 9.4.7.v20170914)

[INFO] |  |  \- (org.eclipse.jetty:jetty-util:jar:9.2.14.v20151106:compile - omitted for conflict with 9.4.7.v20170914)

[INFO] |  \- org.eclipse.jetty:jetty-io:jar:9.2.14.v20151106:compile (version managed from 9.4.7.v20170914)

[INFO] |     \- (org.eclipse.jetty:jetty-util:jar:9.2.14.v20151106:compile - omitted for duplicate)

[INFO] +- org.eclipse.jetty:jetty-annotations:jar:9.4.7.v20170914:compile

[INFO] |  +- org.eclipse.jetty:jetty-plus:jar:9.2.14.v20151106:compile (version managed from 9.4.7.v20170914)

[INFO] |  |  +- (org.eclipse.jetty:jetty-webapp:jar:9.2.14.v20151106:compile - version managed from 9.4.7.v20170914; omitted for duplicate)

[INFO] |  |  \- org.eclipse.jetty:jetty-jndi:jar:9.2.14.v20151106:compile

[INFO] |  |     \- (org.eclipse.jetty:jetty-util:jar:9.2.14.v20151106:compile - omitted for duplicate)

[INFO] |  +- (org.eclipse.jetty:jetty-webapp:jar:9.2.14.v20151106:compile - version managed from 9.4.7.v20170914; omitted for conflict with 9.4.7.v20170914)

[INFO] |  +- javax.annotation:javax.annotation-api:jar:1.2:compile

[INFO] |  +- org.ow2.asm:asm:jar:5.0.3:compile (version managed from 5.1)

[INFO] |  \- org.ow2.asm:asm-commons:jar:5.0.3:compile (version managed from 5.1)

[INFO] |     \- org.ow2.asm:asm-tree:jar:5.0.3:compile

[INFO] |        \- (org.ow2.asm:asm:jar:5.0.3:compile - version managed from 5.1; omitted for duplicate)

[INFO] +- org.eclipse.jetty:jetty-webapp:jar:9.4.7.v20170914:compile

[INFO] |  +- org.eclipse.jetty:jetty-xml:jar:9.2.14.v20151106:compile (version managed from 9.4.7.v20170914)

[INFO] |  |  \- (org.eclipse.jetty:jetty-util:jar:9.2.14.v20151106:compile - omitted for duplicate)

[INFO] |  \- (org.eclipse.jetty:jetty-servlet:jar:9.2.14.v20151106:compile - version managed from 9.4.7.v20170914; omitted for conflict with 9.4.7.v20170914)

[INFO] +- org.eclipse.jetty:jetty-servlet:jar:9.4.7.v20170914:compile

[INFO] |  \- org.eclipse.jetty:jetty-security:jar:9.2.14.v20151106:compile (version managed from 9.4.7.v20170914)

[INFO] |     \- (org.eclipse.jetty:jetty-server:jar:9.2.14.v20151106:compile - omitted for conflict with 9.4.7.v20170914)

[INFO] +- org.eclipse.jetty:jetty-util:jar:9.4.7.v20170914:compile

[INFO] +- org.eclipse.jetty:jetty-servlets:jar:9.4.7.v20170914:compile

[INFO] |  +- org.eclipse.jetty:jetty-continuation:jar:9.2.14.v20151106:compile (version managed from 9.4.7.v20170914)

[INFO] |  +- (org.eclipse.jetty:jetty-http:jar:9.2.14.v20151106:compile - version managed from 9.4.7.v20170914; omitted for duplicate)

[INFO] |  +- (org.eclipse.jetty:jetty-util:jar:9.2.14.v20151106:compile - version managed from 9.4.7.v20170914; omitted for conflict with 9.4.7.v20170914)

[INFO] |  \- (org.eclipse.jetty:jetty-io:jar:9.2.14.v20151106:compile - version managed from 9.4.7.v20170914; omitted for duplicate)

[INFO] +- org.eclipse.jetty:apache-jsp:jar:9.4.7.v20170914:compile

[INFO] |  +- (org.eclipse.jetty:jetty-util:jar:9.2.14.v20151106:compile - version managed from 9.4.7.v20170914; omitted for conflict with 9.4.7.v20170914)

[INFO] |  +- org.eclipse.jetty.toolchain:jetty-schemas:jar:3.1:compile

[INFO] |  +- (javax.servlet:javax.servlet-api:jar:3.1.0:compile - omitted for duplicate)

[INFO] |  +- org.mortbay.jasper:apache-jsp:jar:8.5.9.1:compile

[INFO] |  |  +- (org.eclipse.jetty.toolchain:jetty-schemas:jar:3.1:compile - omitted for duplicate)

[INFO] |  |  \- org.mortbay.jasper:apache-el:jar:8.5.9.1:compile

[INFO] |  +- org.eclipse.jdt.core.compiler:ecj:jar:4.4.2:compile

[INFO] |  \- (org.eclipse.jetty:jetty-annotations:jar:9.2.14.v20151106:compile - version managed from 9.4.7.v20170914; omitted for conflict with 9.4.7.v20170914)

[INFO] +- org.eclipse.jetty:apache-jstl:pom:9.4.7.v20170914:compile

[INFO] |  +- org.apache.taglibs:taglibs-standard-spec:jar:1.2.5:compile

[INFO] |  \- org.apache.taglibs:taglibs-standard-impl:jar:1.2.5:compile

[INFO] +- com.google.gwt:gwt-servlet:jar:2.8.2:runtime

[INFO] +- com.google.gwt:gwt-user:jar:2.8.2:provided

[INFO] |  +- com.google.jsinterop:jsinterop-annotations:jar:1.0.2:provided

[INFO] |  +- com.google.jsinterop:jsinterop-annotations:jar:sources:1.0.2:provided

[INFO] |  +- javax.validation:validation-api:jar:1.0.0.GA:provided

[INFO] |  +- javax.validation:validation-api:jar:sources:1.0.0.GA:provided

[INFO] |  +- (javax.servlet:javax.servlet-api:jar:3.1.0:provided - omitted for duplicate)

[INFO] |  \- org.w3c.css:sac:jar:1.3:provided

[INFO] \- com.google.gwt:gwt-dev:jar:2.8.2:provided

[INFO]    +- com.google.code.findbugs:jsr305:jar:1.3.9:provided

[INFO]    +- com.google.code.gson:gson:jar:2.6.2:provided

[INFO]    +- (org.ow2.asm:asm:jar:5.0.3:provided - version managed from 5.1; omitted for duplicate)

[INFO]    +- org.ow2.asm:asm-util:jar:5.0.3:provided

[INFO]    |  \- (org.ow2.asm:asm-tree:jar:5.0.3:provided - omitted for duplicate)

[INFO]    +- (org.ow2.asm:asm-commons:jar:5.0.3:provided - version managed from 5.1; omitted for duplicate)

[INFO]    +- colt:colt:jar:1.2.0:provided

[INFO]    +- ant:ant:jar:1.6.5:provided

[INFO]    +- commons-collections:commons-collections:jar:3.2.2:provided

[INFO]    +- commons-io:commons-io:jar:2.4:provided

[INFO]    +- com.ibm.icu:icu4j:jar:50.1.1:provided

[INFO]    +- tapestry:tapestry:jar:4.0.2:provided

[INFO]    +- net.sourceforge.htmlunit:htmlunit:jar:2.19:provided

[INFO]    |  +- xalan:xalan:jar:2.7.2:provided

[INFO]    |  |  \- xalan:serializer:jar:2.7.2:provided

[INFO]    |  |     \- (xml-apis:xml-apis:jar:1.3.04:provided - omitted for conflict with 1.4.01)

[INFO]    |  +- (commons-collections:commons-collections:jar:3.2.2:provided - version managed from 3.2.1; omitted for duplicate)

[INFO]    |  +- org.apache.commons:commons-lang3:jar:3.4:provided

[INFO]    |  +- org.apache.httpcomponents:httpclient:jar:4.5.1:provided

[INFO]    |  |  +- org.apache.httpcomponents:httpcore:jar:4.4.3:provided

[INFO]    |  |  +- (commons-logging:commons-logging:jar:1.2:provided - omitted for duplicate)

[INFO]    |  |  \- (commons-codec:commons-codec:jar:1.9:provided - omitted for conflict with 1.10)

[INFO]    |  +- org.apache.httpcomponents:httpmime:jar:4.5.1:provided

[INFO]    |  |  \- (org.apache.httpcomponents:httpclient:jar:4.5.1:provided - omitted for duplicate)

[INFO]    |  +- commons-codec:commons-codec:jar:1.10:provided

[INFO]    |  +- net.sourceforge.htmlunit:htmlunit-core-js:jar:2.17:provided

[INFO]    |  +- xerces:xercesImpl:jar:2.11.0:provided

[INFO]    |  |  \- xml-apis:xml-apis:jar:1.4.01:provided

[INFO]    |  +- net.sourceforge.nekohtml:nekohtml:jar:1.9.22:provided

[INFO]    |  +- net.sourceforge.cssparser:cssparser:jar:0.9.18:provided

[INFO]    |  |  \- (org.w3c.css:sac:jar:1.3:provided - omitted for duplicate)

[INFO]    |  +- (commons-io:commons-io:jar:2.4:provided - omitted for duplicate)

[INFO]    |  +- commons-logging:commons-logging:jar:1.2:provided

[INFO]    |  \- org.eclipse.jetty.websocket:websocket-client:jar:9.2.13.v20150730:provided

[INFO]    |     +- (org.eclipse.jetty:jetty-util:jar:9.2.14.v20151106:provided - version managed from 9.2.13.v20150730; omitted for conflict with 9.4.7.v20170914)

[INFO]    |     +- (org.eclipse.jetty:jetty-io:jar:9.2.14.v20151106:provided - version managed from 9.2.13.v20150730; omitted for duplicate)

[INFO]    |     \- org.eclipse.jetty.websocket:websocket-common:jar:9.2.14.v20151106:provided (version managed from 9.2.13.v20150730)

[INFO]    |        +- org.eclipse.jetty.websocket:websocket-api:jar:9.2.14.v20151106:provided

[INFO]    |        +- (org.eclipse.jetty:jetty-util:jar:9.2.14.v20151106:provided - version managed from 9.2.13.v20150730; omitted for conflict with 9.4.7.v20170914)

[INFO]    |        \- (org.eclipse.jetty:jetty-io:jar:9.2.14.v20151106:provided - version managed from 9.2.13.v20150730; omitted for duplicate)

[INFO]    +- (org.eclipse.jetty:jetty-webapp:jar:9.2.14.v20151106:provided - version managed from 9.4.7.v20170914; omitted for conflict with 9.4.7.v20170914)

[INFO]    +- (org.eclipse.jetty:jetty-servlets:jar:9.2.14.v20151106:provided - omitted for conflict with 9.4.7.v20170914)

[INFO]    +- (org.eclipse.jetty:jetty-annotations:jar:9.2.14.v20151106:provided - version managed from 9.4.7.v20170914; omitted for conflict with 9.4.7.v20170914)

[INFO]    \- (org.eclipse.jetty:apache-jsp:jar:9.2.14.v20151106:provided - omitted for conflict with 9.4.7.v20170914)

Here is the POM file:

<?xml version="1.0" encoding="UTF-8"?>
<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/maven-v4_0_0.xsd">

    <modelVersion>4.0.0</modelVersion>
    <groupId>com.mycompany.app</groupId>
    <artifactId>my-app</artifactId>
    <packaging>jar</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>Maven Archetype for GWT</name>

    <properties>
        <!-- Convenience property to set the GWT version -->
        <gwt.version>2.8.2</gwt.version>

        <!-- GWT 2.8 requires 1.8 -->
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>

        <version.jetty>9.4.7.v20170914</version.jetty>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>com.google.gwt</groupId>
                <artifactId>gwt</artifactId>
                <version>${gwt.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>

         <!--Jetty-->
        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-server</artifactId>
            <version>${version.jetty}</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-annotations</artifactId>
            <version>${version.jetty}</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-webapp</artifactId>
            <version>${version.jetty}</version>
        </dependency>

        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-servlet</artifactId>
            <version>${version.jetty}</version>
        </dependency>

        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-util</artifactId>
            <version>${version.jetty}</version>
        </dependency>

        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-servlets</artifactId>
            <version>${version.jetty}</version>
        </dependency>

        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>apache-jsp</artifactId>
            <version>${version.jetty}</version>
            <type>jar</type>
        </dependency>
        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>apache-jstl</artifactId>
            <version>${version.jetty}</version>
            <type>pom</type>
        </dependency>

        <dependency>
            <groupId>com.google.gwt</groupId>
            <artifactId>gwt-servlet</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>com.google.gwt</groupId>
            <artifactId>gwt-user</artifactId>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>com.google.gwt</groupId>
            <artifactId>gwt-dev</artifactId>
            <scope>provided</scope>
        </dependency>


    </dependencies>

    <build>
        <finalName>MyWebApp</finalName>

        <!-- Output classes directly into the webapp, so that IDEs and "mvn process-classes" update them in DevMode -->
        <!--<outputDirectory>${project.build.directory}/${project.build.finalName}/WEB-INF/classes</outputDirectory>-->
        <outputDirectory>target/MyWebApp</outputDirectory>


        <plugins>

            <!-- Mojo's Maven Plugin for GWT -->
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>gwt-maven-plugin</artifactId>
                <version>${gwt.version}</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>compile</goal>
                            <goal>test</goal>
                            <goal>generateAsync</goal>
                        </goals>
                    </execution>
                </executions>
                <!-- Plugin configuration. There are many available options, see
                  gwt-maven-plugin documentation at codehaus.org -->
                <configuration>
                    <runTarget>MyWebApp.html</runTarget>
                    <modules>
                        <module>com.mycompany.app.MyWebApp</module>
                    </modules>
                </configuration>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-assembly-plugin</artifactId>
                <version>3.1.0</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>single</goal>
                        </goals>
                        <configuration>
                            <archive>
                                <manifest>
                                    <mainClass>com.mycompany.app.JettyServer</mainClass>
                                </manifest>
                            </archive>
                            <descriptorRefs>
                                <descriptorRef>jar-with-dependencies</descriptorRef>
                            </descriptorRefs>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

            <plugin>
                <artifactId>maven-resources-plugin</artifactId>
                <executions>

                    <execution>
                        <id>web_files</id>
                        <phase>compile</phase>
                        <goals>
                            <goal>copy-resources</goal>
                        </goals>
                        <configuration>
                            <outputDirectory>target/MyWebApp</outputDirectory>
                            <resources>
                                <resource>
                                    <directory>src/main/webapp</directory>
                                </resource>
                            </resources>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

        </plugins>
    </build>

</project>

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