Uiautomator Didn't find class on path DexPathList

问题

I am currently developing a Java project in order to perform automatic screenshots of my Android application, however, when performing the uiautomator command:

adb shell uiautomator runtest AutoScreenshot.jar -c test.ScreenshotRoutine

I am getting the following error:

INSTRUMENTATION_RESULT: shortMsg=java.lang.RuntimeException
INSTRUMENTATION_RESULT: longMsg=Didn't find class "test.ScreenshotRoutine" on pa
th: DexPathList[[zip file "/system/framework/android.test.runner.jar", zip file
"/system/framework/uiautomator.jar", zip file "/data/local/tmp/AutoSc
reenshot.jar"],nativeLibraryDirectories=[/system/lib]]
INSTRUMENTATION_CODE: 0

I have already searched everywhere and lost around 1 day around this issue. It seems that the answers around these kind of questions are over 1 year old and none of the solutions have worked for me. I have followed the examples found here and here, and changed the project slightly and have the following project structure:

src
 |- test
   |- <class extending UiAutomatorTestCase>
   |- interfaces
   |- routines
   |- utils

My ANT file for generating the JAR file is the following:

<?xml version="1.0" encoding="UTF-8"?>
<project name="AutoScreenshot.makejar" basedir=".">
    <property name="src.dir" value="src"/>
    <property name="libs.dir" value="libs"/>
    <property name="root.dir" value="build"/>
    <property name="jar.dir" value="${root.dir}/jar"/>
    <property name="jar.file" value="${jar.dir}/AutoScreenshot.jar"/>
    <property name="classes.dir" value="${root.dir}/classes"/>

    <path id="jars-classpath">
        <fileset dir="${libs.dir}">
            <include name="*.jar"/>
        </fileset>
    </path>

    <target name="clean">
        <delete dir="${root.dir}"/>
    </target>

    <target name="compile">
        <mkdir dir="${classes.dir}"/>
        <mkdir dir="${jar.dir}"/>

        <javac srcdir="${src.dir}" destdir="${classes.dir}" target="1.8" includeantruntime="false">
            <classpath refid="jars-classpath"/>
        </javac>
        <jar jarfile="${jar.file}" basedir="${classes.dir}">
            <fileset dir="${libs.dir}" includes="**/*.jar" />
            <fileset dir="${classes.dir}" includes="**/*.class" />
        </jar>
    </target>
</project>

Inside my Java project, I have created a ´libs´ folder which holds:

android.jar;
junit.jar;
uiautomator.jar.

Am I missing something, where am I missing it? If you need any other file you consider relevant, please feel free to ask.

UPDATE #1 - Add batch file content

Here is what I have in the batch file I've done in order to compile and upload the jar file

@echo off
echo CLEANING PROJECT
call ant clean

echo COMPILING JAR FILE
call ant compile

echo PUSHING JAR FILE TO DEVICE
call adb push "D:\Workspaces\...\build\jar\AutoScreenshot.jar" /data/local/tmp/

echo EXECUTING JAR FILE ON DEVICE
call adb shell uiautomator runtest /data/local/tmp/AutoScreenshot.jar -c test.ScreenshotRoutine#runRoutine -e lang en

Many thanks in advance.

来源：https://stackoverflow.com/questions/32200292/uiautomator-didnt-find-class-class-on-path-dexpathlist

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