新手eclipse开发bpel加减法调用遇到问题，真心求教
目前采用的开发工具eclipse for javaEE，tomcat7，jdk1.6，以及bpel相关插件在变量设置的时候，点browse…不会出现设置界面，跳出 unhandled event loop exception
具体错误信息如下：
Unhandled event loop exception
java.lang.NullPointerException
at org.eclipse.bpel.ui.dialogs.TypeSelectorDialog.updateOkState(TypeSelectorDialog.java:306)
at org.eclipse.ui.dialogs.AbstractElementListSelectionDialog.handleElementsChanged(AbstractElementListSelectionDialog.java:195)
at org.eclipse.ui.dialogs.AbstractElementListSelectionDialog.setListElements(AbstractElementListSelectionDialog.java:179)
at org.eclipse.bpel.ui.dialogs.ListAndViewDialog.createDialogArea(ListAndViewDialog.java:129)
at org.eclipse.jface.dialogs.Dialog.createContents(Dialog.java:775)
at org.eclipse.bpel.ui.dialogs.TypeSelectorDialog.createContents(TypeSelectorDialog.java:164)
at org.eclipse.jface.window.Window.create(Window.java:432)
at org.eclipse.jface.dialogs.Dialog.create(Dialog.java:1104)
at org.eclipse.ui.dialogs.SelectionStatusDialog.create(SelectionStatusDialog.java:153)
at org.eclipse.ui.dialogs.AbstractElementListSelectionDialog.access$superCreate(AbstractElementListSelectionDialog.java:446)
at org.eclipse.ui.dialogs.AbstractElementListSelectionDialog.access$2(AbstractElementListSelectionDialog.java:445)
at org.eclipse.ui.dialogs.AbstractElementListSelectionDialog$4.run(AbstractElementListSelectionDialog.java:457)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at org.eclipse.ui.dialogs.AbstractElementListSelectionDialog.create(AbstractElementListSelectionDialog.java:455)
at org.eclipse.jface.window.Window.open(Window.java:791)
at org.eclipse.ui.dialogs.AbstractElementListSelectionDialog.open(AbstractElementListSelectionDialog.java:441)
at org.eclipse.bpel.ui.util.BrowseUtil.browseForVariableType(BrowseUtil.java:133)
at org.eclipse.bpel.ui.properties.VariableTypeSelector$9.widgetSelected(VariableTypeSelector.java:680)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:248)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1057)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4170)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3759)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1113)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:997)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:138)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:610)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:567)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:354)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:181)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:636)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:591)
at org.eclipse.equinox.launcher.Main.run(Main.java:1450)
Eclipse 异常 BPEL --------------------编程问答-------------------- 看看那一值为空了 --------------------编程问答-------------------- 空指针异常
--------------------编程问答--------------------
可能空指针错误，你定义了没有声明的变量了。在Eclipse中经常出现这种问题！
补充：Java , Eclipse
