Cannot load 32-bit SWT libraries on 64-bit JVM

I'm developing an Eclipse RCP. I'm using Jenkins as CI sever that builds the system and run the unit tests. I can run my unit tests from within the Eclipse IDE without any problem but when Jenkins try to do the same in the build job, I get the following error message:

[INFO] --- maven-surefire-plugin:2.18.1:test (test) @ net.morcate.console.scripting ---
[INFO] Surefire report directory: /var/lib/jenkins/jobs/Console-Devel/workspace/sssb-console/net.morcate.console.scripting/target/surefire-reports

-------------------------------------------------------
 T E S T S
-------------------------------------------------------

Running net.morcate.console.scripting.views.browser.FileServerStatusListenerTest

Tests run: 10, Failures: 0, Errors: 10, Skipped: 0, Time elapsed: 1.353 sec <<< FAILURE! - in net.morcate.console.scripting.views.browser.FileServerStatusListenerTest
StatusChange_With_Status_INITIALIZING_Should_NOT_UpdateBrowser(net.morcate.console.scripting.views.browser.FileServerStatusListenerTest)  Time elapsed: 1.315 sec  <<< ERROR!
java.lang.UnsatisfiedLinkError: Cannot load 32-bit SWT libraries on 64-bit JVM
    at org.eclipse.swt.internal.Library.loadLibrary(Library.java:263)
    at org.eclipse.swt.internal.Library.loadLibrary(Library.java:240)
    at org.eclipse.swt.internal.C.<clinit>(C.java:21)
    at org.eclipse.swt.widgets.Display.<clinit>(Display.java:138)
    at sun.reflect.GeneratedSerializationConstructorAccessor7.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at org.objenesis.instantiator.sun.SunReflectionFactoryInstantiator.newInstance(SunReflectionFactoryInstantiator.java:40)
    at org.objenesis.ObjenesisBase.newInstance(ObjenesisBase.java:59)
    at org.mockito.internal.creation.jmock.ClassImposterizer.createProxy(ClassImposterizer.java:111)
    at org.mockito.internal.creation.jmock.ClassImposterizer.imposterise(ClassImposterizer.java:51)
    at org.mockito.internal.util.MockUtil.createMock(MockUtil.java:54)
    at org.mockito.internal.MockitoCore.mock(MockitoCore.java:45)
    at org.mockito.Mockito.mock(Mockito.java:921)
    at org.mockito.internal.configuration.DefaultAnnotationEngine.processAnnotationOn(DefaultAnnotationEngine.java:61)
    at org.mockito.internal.configuration.DefaultAnnotationEngine.createMockFor(DefaultAnnotationEngine.java:36)
    at org.mockito.internal.configuration.DefaultAnnotationEngine.process(DefaultAnnotationEngine.java:85)
    at org.mockito.internal.configuration.InjectingAnnotationEngine.process(InjectingAnnotationEngine.java:40)
    at org.mockito.MockitoAnnotations.scan(MockitoAnnotations.java:112)
    at org.mockito.MockitoAnnotations.initMocks(MockitoAnnotations.java:95)
    at org.mockito.internal.runners.JUnit45AndHigherRunnerImpl$1.withBefores(JUnit45AndHigherRunnerImpl.java:27)
    at org.junit.runners.BlockJUnit4ClassRunner.methodBlock(BlockJUnit4ClassRunner.java:268)
    at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
    at org.mockito.internal.runners.JUnit45AndHigherRunnerImpl.run(JUnit45AndHigherRunnerImpl.java:37)
    at org.mockito.runners.MockitoJUnitRunner.run(MockitoJUnitRunner.java:62)
    at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:283)
    at org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:173)
    at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:153)
    at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:128)
    at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:203)
    at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:155)
    at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:103)

Both computers are Linux Ubuntu 14.04LTS - 64 bits. So, my guess is that there is some configuration problem in my CI server.

Any ideas? Thank you very much.

Joaquin