Exception didn't seem to affect anything and was not visible to user. Need to check to make sure you're not passing null to Text.setText(String). That method is called a number of times in the RestWarDeploymentInfoPanel.

java.lang.IllegalArgumentException: Argument cannot be null
at org.eclipse.swt.SWT.error(SWT.java:4064)
at org.eclipse.swt.SWT.error(SWT.java:3998)
at org.eclipse.swt.SWT.error(SWT.java:3969)
at org.eclipse.swt.widgets.Widget.error(Widget.java:715)
at org.eclipse.swt.widgets.Text.setText(Text.java:1870)
at org.teiid.designer.dqp.webservice.war.ui.wizards.RestWarDeploymentInfoPanel.loadData(RestWarDeploymentInfoPanel.java:98)
at org.teiid.designer.dqp.webservice.war.ui.wizards.RestWarDeploymentInfoDialog.loadDefault(RestWarDeploymentInfoDialog.java:237)
at org.teiid.designer.dqp.webservice.war.ui.wizards.RestWarDeploymentInfoDialog.createButtonsForButtonBar(RestWarDeploymentInfoDialog.java:135)
at org.eclipse.jface.dialogs.Dialog.createButtonBar(Dialog.java:672)
at org.eclipse.jface.dialogs.TrayDialog.createButtonBar(TrayDialog.java:200)
at org.eclipse.jface.dialogs.TitleAreaDialog.createContents(TitleAreaDialog.java:156)
at org.eclipse.jface.window.Window.create(Window.java:431)
at org.eclipse.jface.dialogs.Dialog.create(Dialog.java:1089)
at org.eclipse.jface.window.Window.open(Window.java:790)
at org.teiid.designer.dqp.webservice.war.ui.wizards.RestWarDeploymentInfoDialog.open(RestWarDeploymentInfoDialog.java:173)
at org.teiid.designer.runtime.ui.GenerateRestWarAction.run(GenerateRestWarAction.java:127)