Question

I have a Java project that uses this driver for serial communication. The driver uses a dll under Windows to create serial ports.

The project contains several JUnit tests which complete successfully using the “Run as -> JUnit Test”. However, the tests referencing the native library fail when running ant (and tests that do not reference the native library pass).

My best guess so far is to add the directory that contains the native library to the java.library.path, but I haven’t succeeded in doing so through the build.xml file.

Can somebody tell a (clean) solution?

Here is my build.xml:

<path id="compile.classpath">
    <fileset dir="${lib}">
        <include name="**/*.jar"/>
    </fileset>
    <fileset dir="${junit_home}">
        <include name="**/*.jar"/>
    </fileset>
</path>

<path id="test.classpath">
    <pathelement location="${bin}" />
    <fileset dir="${lib}">
         <include name="**/*.jar"/>
     </fileset>
    <fileset dir="${junit_home}">
        <include name="**/*.jar"/>
    </fileset>
</path>

<target name="compile">
    <mkdir dir="${bin}" />
    <echo Message="Compiling src folder..." />
    <javac includeantruntime="no" classpathref="compile.classpath" srcdir="${src}" destdir="${bin}" />
    <echo Message="Compiling test folder..." />
    <javac includeantruntime="no" classpathref="compile.classpath" srcdir="${test}" destdir="${bin}" />
</target>

<target name="test">
    <mkdir dir="${test.reports}" />
    <junit fork="yes" printsummary="yes" haltonfailure="yes">
        <test name="${test.class.name}" todir="${test.reports}" />
        <formatter type="xml" />
        <classpath refid="test.classpath" />
    </junit>
</target>

And here is a part of the test report (in XML):

    <testcase classname="nl.timo.comport.test.buildservertests.ComportFactoryTest" name="testGetInstance" time="0.0" />
  <testcase classname="nl.timo.comport.test.buildservertests.ComportFactoryTest" name="testCreateDefaultComport" time="0.016">
    <error message="giovynet.nativelink.SerialPort.getStateSerialPortC(Ljava/lang/String;)Ljava/lang/String;" type="java.lang.UnsatisfiedLinkError">java.lang.UnsatisfiedLinkError: giovynet.nativelink.SerialPort.getStateSerialPortC(Ljava/lang/String;)Ljava/lang/String;
    at giovynet.nativelink.SerialPort.getStateSerialPortC(Native Method)
    at giovynet.nativelink.SerialPort.getFreeSerialPort(SerialPort.java:50)
    at package.comport.GioComport.getFreeSerialPorts(Unknown Source)
    at package.comport.GioComport.findDevice(Unknown Source)
    at package.comport.GioComport.&lt;init&gt;(Unknown Source)
    at package.comport.ComportFactory.createNewPort(Unknown Source)
    at package.comport.ComportFactory.createComport(Unknown Source)
    at package.comport.test.buildservertests.ComportFactoryTest.testCreateDefaultComport(Unknown Source)
</error>
  </testcase>
  <testcase classname="nl.timo.comport.test.buildservertests.ComportFactoryTest" name="testCreateComportWithWrongSettings" time="0.0">
    <error message="giovynet.nativelink.SerialPort.getStateSerialPortC(Ljava/lang/String;)Ljava/lang/String;" type="java.lang.UnsatisfiedLinkError">java.lang.UnsatisfiedLinkError: giovynet.nativelink.SerialPort.getStateSerialPortC(Ljava/lang/String;)Ljava/lang/String;
    at giovynet.nativelink.SerialPort.getStateSerialPortC(Native Method)
    at giovynet.nativelink.SerialPort.getFreeSerialPort(SerialPort.java:50)
    at package.comport.GioComport.getFreeSerialPorts(Unknown Source)
    at package.comport.GioComport.findDevice(Unknown Source)
    at package.comport.GioComport.&lt;init&gt;(Unknown Source)
    at package.comport.ComportFactory.createNewPort(Unknown Source)
    at package.comport.ComportFactory.createComport(Unknown Source)
    at package.comport.test.buildservertests.ComportFactoryTest.testCreateComportWithWrongSettings(Unknown Source)
</error>
  </testcase>
  <system-out><![CDATA[]]></system-out>
  <system-err><![CDATA[java.lang.UnsatisfiedLinkError: no libSerialPort in java.library.path
    at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1738)

Answer 1

The junit task in Ant, allow setting system properties, just like some of the other tasks. You’ll need to specify the java.library.path value in the sysproperty nested element as:

<junit fork="yes" printsummary="yes" haltonfailure="yes">
    <test name="${test.class.name}" todir="${test.reports}" />
    <formatter type="xml" />
    <classpath refid="test.classpath" />
    <sysproperty key="java.library.path" value="put your library path here"/>
</junit>