ArrayIndexOutOfBoundsException when trying to edit value of input ptoperty in properties window

eclipse.buildId=M20100211-1343
java.version=1.6.0_18
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=linux, ARCH=x86, WS=gtk, NL=en_US
Command-line arguments: -os linux -ws gtk -arch x86 -debug

Struts Tools - Version: 3.1.0.v201004221334N-H154-GA

Following Struts tools tutorial and ArrayIndexOutOfBoundsException during steps in chapter 6.6 (http://www.redhat.com/docs/en-US/JBoss_Developer_Studio/3.0/html/Struts_Tools_Tutorial/EditingTheAction.html) appears

Steps to Reproduce :
have some struts web project (struts version 1.2, servlet version 2.4) with at least one action/action-mapping defined

• In the Web Projects view, expand the node under the StrutsHello > Configuration > default > struts-config.xml > action-mappings node, right-click the /greeting action, and then select Properties...from the context menu
• In the Edit Properties window, insert the cursor into the value column for the input property and click on the ... button

Expected: dialog appears

Actual:
java.lang.ArrayIndexOutOfBoundsException: 0
at org.jboss.tools.common.meta.action.impl.SpecialWizardSupport.getSubtitle(SpecialWizardSupport.java:104)
at org.jboss.tools.common.model.ui.wizards.special.DefaultSpecialWizard.setStep(DefaultSpecialWizard.java:131)
at org.jboss.tools.common.model.ui.wizards.special.DefaultSpecialWizard.open(DefaultSpecialWizard.java:81)
at org.jboss.tools.common.model.ui.wizards.special.DefaultSpecialWizard.execute(DefaultSpecialWizard.java:64)
at org.jboss.tools.common.meta.action.impl.handlers.DefaultSpecialHandler.executeHandler(DefaultSpecialHandler.java:61)
at org.jboss.tools.common.meta.action.impl.XActionImpl.executeHandler(XActionImpl.java:65)
at org.jboss.tools.common.model.ui.action.XModelObjectAction.actionPerformed(XModelObjectAction.java:96)
at org.jboss.tools.common.model.ui.action.XModelObjectActionInvoker.execute(XModelObjectActionInvoker.java:36)
at org.jboss.tools.common.meta.action.XActionInvoker.invoke(XActionInvoker.java:53)
at org.jboss.tools.common.meta.action.XActionInvoker.invoke(XActionInvoker.java:33)
at org.jboss.tools.struts.ui.wizard.selectpath.PathEditorAdapter.invoke0(PathEditorAdapter.java:124)
at org.jboss.tools.struts.ui.wizard.selectpath.PathEditorAdapter.invoke(PathEditorAdapter.java:99)
at org.jboss.tools.common.model.ui.attribute.editor.ActiveCellEditor.callExternal(ActiveCellEditor.java:24)
at org.jboss.tools.common.model.ui.attribute.editor.ActiveEditor.callExternal(ActiveEditor.java:58)
at org.jboss.tools.common.model.ui.attribute.editor.DialogCellEditorEx.openDialogBox(DialogCellEditorEx.java:117)
at org.eclipse.jface.viewers.DialogCellEditor$2.widgetSelected(DialogCellEditor.java:244)
...