Question

Could someone tell me what I need to do to enable Guava support in GWT.

I have downloaded Guava R07 and in there there are the following two files:

• guava-r07.jar
• guava-r07-gwt.jar

I have a few questions regarding this:

1. Where do these files go? I am guessing that the standard Jar is made available to my IDE for coding, and that both are made available to the GWT compiler for building the JavaScript?
2. Do I need to add all the .gwt.xml files from the -gwt.jar into my project’s main gwt.xml file or only the portions I need?
3. There are other Jars on the trunk of the Guava&GWT project (ie not in the download, such as one for jsr305) which I think I may need, but I’m not sure.

Sorry, normally I don’t have trouble with this kind of thing, but I can’t quite work out what goes where.

FYI I’m using GWT 1.6 for the time being, but am hoping to move to 2 soon. If Guava isn’t compatible with 1.6 that is not a problem.

Update

I have the following files in a folder called gwtlib:

• guava-r07-gwt.jar
• guava-r07.jar
• jsr305-1.3.9.jar

And my Ant script does the following:

<path id="project.class.path">
    <fileset dir="gwtlibs" includes="guava-r07.jar"/>
    <fileset dir="gwtlibs" includes="guava-r07-gwt.jar"/>
    <fileset dir="gwtlibs" includes="jsr305-1.3.9.jar"/>
    <pathelement location="${gwt.sdk}/gwt-user.jar"/>
    <fileset dir="${gwt.sdk}" includes="gwt-dev*.jar"/>
</path>

<target name="gwtc">
    <java failonerror="true" fork="true" classname="com.google.gwt.dev.Compiler">
        <classpath>
            <pathelement location="app"/>
            <path refid="project.class.path"/>
        </classpath>
        <jvmarg value="-Xmx256M"/>
        <arg value="-localWorkers"/>
        <arg value="2"/>
        <arg value="-war"/>
        <arg value="gwt-public"/>
        <arg value="Main"/>
    </java>
</target>

Running the above command, I get the following errors:

• Errors in ‘jar:file:///project/gwtlibs/guava-r07-gwt.jar!/com/google/common/collect/Constraints.java’
• Line 254: The method subList(int, int) is undefined for the type List

Without the jsr jar on the classpath, I get the following errors:

• The import javax.annotation cannot be resolved
• Nullable cannot be resolved to a type

Thanks

Rich

Answer 1

Guava isn’t compatible with GWT 1.6. List.subList, in particular, is added to GWT in GWT 2. The earliest version that we fully supported is GWT 2.0.4