BadLocationException when querying for work items using Java API

java.lang.NoClassDefFoundError: org.eclipse.jface.text.BadLocationException
    at java.lang.J9VMInternals.verifyImpl(Native Method)
    at java.lang.J9VMInternals.verify(J9VMInternals.java:72)
    at java.lang.J9VMInternals.verify(J9VMInternals.java:70)
    at java.lang.J9VMInternals.verify(J9VMInternals.java:70)
    at java.lang.J9VMInternals.initialize(J9VMInternals.java:134)
    at com.ibm.team.process.internal.common.util.AbstractProcess.computeConfigurationData(AbstractProcess.java:325)
    at com.ibm.team.process.internal.common.util.AbstractProcess.getProjectConfigurationData(AbstractProcess.java:313)
    at com.ibm.team.process.internal.common.util.AbstractProcess.getProjectConfigurationData(AbstractProcess.java:299)
    at com.ibm.team.workitem.client.internal.AuditableClientProcess.findProcessConfiguration(AuditableClientProcess.java:68)
    at com.ibm.team.workitem.common.internal.EnumerationManager$InternalEnumerations.resolve(EnumerationManager.java:52)
    at com.ibm.team.workitem.common.internal.EnumerationManager.updateCache(EnumerationManager.java:198)
    at com.ibm.team.workitem.common.internal.util.CacheHelper.internalCheckCache(CacheHelper.java:131)
    at com.ibm.team.workitem.common.internal.util.CacheHelper.checkCache(CacheHelper.java:81)
    at com.ibm.team.workitem.common.internal.util.CacheHelper.checkCache(CacheHelper.java:72)
    at com.ibm.team.workitem.common.internal.EnumerationManager.internalResolve(EnumerationManager.java:173)
    at com.ibm.team.workitem.common.internal.EnumerationManager.resolve(EnumerationManager.java:169)
    at com.ibm.team.workitem.common.internal.WorkItemCommon.resolveEnumeration(WorkItemCommon.java:453)
    at com.ibm.team.workitem.common.internal.model.EnumerationAttributeType.getNullValue(EnumerationAttributeType.java:41)
    at com.ibm.team.workitem.common.internal.model.impl.AttributeImpl.getNullValue(AttributeImpl.java:875)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:48)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
    at java.lang.reflect.Method.invoke(Method.java:600)
    at com.ibm.team.repository.common.internal.util.ItemStore$ItemInvocationHandler.invoke(ItemStore.java:597)
    at $Proxy16.getNullValue(Unknown Source)
    at com.ibm.team.workitem.common.internal.expression.WorkItemQueryAttributeFactory.getNullValue(WorkItemQueryAttributeFactory.java:274)
    at com.ibm.team.workitem.common.internal.expression.WorkItemQueryAttributeFactory.findNonLinkAttributes(WorkItemQueryAttributeFactory.java:238)
    at com.ibm.team.workitem.common.internal.expression.WorkItemQueryAttributeFactory.updateCache(WorkItemQueryAttributeFactory.java:172)
    at com.ibm.team.workitem.common.internal.util.CacheHelper.internalCheckCache(CacheHelper.java:131)
    at com.ibm.team.workitem.common.internal.util.CacheHelper.checkCache(CacheHelper.java:81)
    at com.ibm.team.workitem.common.internal.expression.WorkItemQueryAttributeFactory.findAttribute(WorkItemQueryAttributeFactory.java:137)
    at com.nbn.ib2b.infra.scm.common.RTCWorkItemManager.printWorkItemTypes(RTCWorkItemManager.java:105)
    at com.nbn.ib2b.infra.scm.SCMQueryWorkItems.executeQuery(SCMQueryWorkItems.java:73)
    at com.nbn.ib2b.infra.scm.SCMQueryWorkItems.run(SCMQueryWorkItems.java:40)
    at com.nbn.ib2b.infra.scm.common.RTCBase.execute(RTCBase.java:187)
    at com.nbn.ib2b.infra.scm.test.SCMQueryWorkItemsTest.testExecute(SCMQueryWorkItemsTest.java:13)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:48)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
    at java.lang.reflect.Method.invoke(Method.java:600)
    at junit.framework.TestCase.runTest(TestCase.java:164)
    at junit.framework.TestCase.runBare(TestCase.java:130)
    at junit.framework.TestResult$1.protect(TestResult.java:106)
    at junit.framework.TestResult.runProtected(TestResult.java:124)
    at junit.framework.TestResult.run(TestResult.java:109)
    at junit.framework.TestCase.run(TestCase.java:120)
    at junit.framework.TestSuite.runTest(TestSuite.java:230)
    at junit.framework.TestSuite.run(TestSuite.java:225)
    at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: java.lang.ClassNotFoundException: org.eclipse.jface.text.BadLocationException
    at java.lang.ClassNotFoundException.<init>(ClassNotFoundException.java:77)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:383)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:643)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:346)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:609)
    ... 54 more



Getting above stack trace when running a simple snippet as gathered from other posts on forum (this bit is what's in 'printWorkItemTypes'):

       IProjectArea projectArea = findProjectArea(projectAreaName);
       IQueryableAttributeFactory attFactory = QueryableAttributes.getFactory(IWorkItem.ITEM_TYPE);

      IQueryableAttribute workItemTypeAttribute = attFactory.findAttribute(projectArea, IWorkItem.TYPE_PROPERTY, auditableClient, null);
     
The projectArea and auditableClient values are valid, so I'm a bit stuck at the minute.