# IndexOf in a template **URL:** \ **Category:** Ignition\ **Created:** [June 1, 2017, 2:58pm UTC](https://forum.inductiveautomation.com/t/indexof-in-a-template/14439 "2017-06-01T14:58:35Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Dannymichaud](https://avatars.discourse-cdn.com/v4/letter/d/48db29/32.png) [@Dannymichaud](https://forum.inductiveautomation.com/u/Dannymichaud)\ **Post date:** [June 1, 2017, 2:58pm UTC](https://forum.inductiveautomation.com/t/indexof-in-a-template/14439/1 "2017-06-01T14:58:35Z")
I’m trying to get the position of a caracter in a sting substring({Obj\_DI\_Square.DeviceTag::ID},indexOf({Obj\_DI\_Square.DeviceTag::ID}, “.”),len({Obj\_DI\_Square.DeviceTag::ID})) And the indexOf({Obj\_DI\_Square.DeviceTag::ID}, “.”) is causing a error java.lang.Exception: Error executing expression binding on Obj\_DI\_Square.Obj\_DI\_Square.lab\_objectID.text Any Idea? ---
**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\ **Post date:** [June 1, 2017, 3:11pm UTC](https://forum.inductiveautomation.com/t/indexof-in-a-template/14439/2 "2017-06-01T15:11:47Z")
Can you post the full stack trace of the error? On the error dialog, click ‘Full’, then copy the full text and paste it in here. As a preliminary guess - is the ID tag actually a string, or is it a numeric type (integer, float, etc)? ---
**Author:** ![Dannymichaud](https://avatars.discourse-cdn.com/v4/letter/d/48db29/32.png) [@Dannymichaud](https://forum.inductiveautomation.com/u/Dannymichaud)\ **Post date:** [June 1, 2017, 3:14pm UTC](https://forum.inductiveautomation.com/t/indexof-in-a-template/14439/3 "2017-06-01T15:14:42Z")
java.lang.Exception: Error executing expression binding on Obj\_DI\_Square.Obj\_DI\_Square.lab\_objectID.text at com.inductiveautomation.factorypmi.application.binding.ExpressionPropertyAdapter.runExpression(ExpressionPropertyAdapter.java:91) at com.inductiveautomation.factorypmi.application.binding.ExpressionPropertyAdapter.startup(ExpressionPropertyAdapter.java:112) at com.inductiveautomation.factorypmi.application.binding.DefaultInteractionController.setPropertyAdapter(DefaultInteractionController.java:207) at com.inductiveautomation.factorypmi.designer.property.configurators.ExpressionConfigurator.bind(ExpressionConfigurator.java:283) at com.inductiveautomation.factorypmi.designer.property.configurators.ExpressionConfigurator.tryCommit(ExpressionConfigurator.java:219) at com.inductiveautomation.factorypmi.designer.property.configurators.ConfiguratorMultiplexor$EditorParent.tryCommit(ConfiguratorMultiplexor.java:213) at com.inductiveautomation.factorypmi.designer.property.configurators.ConfiguratorMultiplexor.tryCommit(ConfiguratorMultiplexor.java:358) at com.inductiveautomation.factorypmi.designer.property.configurators.DynamicOptsDialog.doOK(DynamicOptsDialog.java:117) at com.inductiveautomation.factorypmi.designer.property.configurators.DynamicOptsDialog.access$000(DynamicOptsDialog.java:43) at com.inductiveautomation.factorypmi.designer.property.configurators.DynamicOptsDialog$1.actionPerformed(DynamicOptsDialog.java:83) at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.setPressed(Unknown Source) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source) at java.awt.Component.processMouseEvent(Unknown Source) at javax.swing.JComponent.processMouseEvent(Unknown Source) at java.awt.Component.processEvent(Unknown Source) at java.awt.Container.processEvent(Unknown Source) at java.awt.Component.dispatchEventImpl(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Window.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.EventQueue.dispatchEventImpl(Unknown Source) at java.awt.EventQueue.access$500(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue$4.run(Unknown Source) at java.awt.EventQueue$4.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.WaitDispatchSupport$2.run(Unknown Source) at java.awt.WaitDispatchSupport$4.run(Unknown Source) at java.awt.WaitDispatchSupport$4.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.awt.WaitDispatchSupport.enter(Unknown Source) at java.awt.Dialog.show(Unknown Source) at java.awt.Component.show(Unknown Source) at java.awt.Component.setVisible(Unknown Source) at java.awt.Window.setVisible(Unknown Source) at java.awt.Dialog.setVisible(Unknown Source) at com.inductiveautomation.factorypmi.designer.property.configurators.DynamicOptsDialog.showDialog(DynamicOptsDialog.java:185) at com.inductiveautomation.factorypmi.designer.model.VisionDesignerImpl.openBindingDialog(VisionDesignerImpl.java:1119) at com.inductiveautomation.vision.api.designer.beans.InPlaceEditHandler.onDoubleClick(InPlaceEditHandler.java:58) at com.inductiveautomation.factorypmi.designer.workspace.WindowWorkspace.handleDoubleClick(WindowWorkspace.java:813) at com.inductiveautomation.ignition.designer.designable.tools.SelectionTool.onDoubleClick(SelectionTool.java:552) at com.inductiveautomation.ignition.designer.designable.DesignPanel$ToolMouseListener.onClick(DesignPanel.java:998) at com.inductiveautomation.ignition.client.util.gui.CommonMouseAdapter.mouseReleased(CommonMouseAdapter.java:69) at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source) at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source) at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source) at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source) at java.awt.Component.processMouseEvent(Unknown Source) at javax.swing.JComponent.processMouseEvent(Unknown Source) at java.awt.Component.processEvent(Unknown Source) at java.awt.Container.processEvent(Unknown Source) at java.awt.Component.dispatchEventImpl(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Window.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.EventQueue.dispatchEventImpl(Unknown Source) at java.awt.EventQueue.access$500(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue$4.run(Unknown Source) at java.awt.EventQueue$4.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source) Caused by: java.lang.NullPointerException at com.inductiveautomation.ignition.common.expressions.DefaultFunctionFactory$IndexOfFunction.execute(DefaultFunctionFactory.java:558) at com.inductiveautomation.ignition.common.expressions.FunctionExpression.execute(FunctionExpression.java:69) at com.inductiveautomation.factorypmi.application.binding.ExpressionPropertyAdapter.runExpression(ExpressionPropertyAdapter.java:82) … 94 more Ignition v7.9.1 (b2017012511) Java: Oracle Corporation 1.8.0\_102 ---
**Author:** ![Dannymichaud](https://avatars.discourse-cdn.com/v4/letter/d/48db29/32.png) [@Dannymichaud](https://forum.inductiveautomation.com/u/Dannymichaud)\ **Post date:** [June 1, 2017, 3:15pm UTC](https://forum.inductiveautomation.com/t/indexof-in-a-template/14439/4 "2017-06-01T15:15:48Z")
i have been able to get around by try(substring({Obj\_DI\_Square.DeviceTag::ID},indexOf({Obj\_DI\_Square.DeviceTag::ID}, “.”)+1,len({Obj\_DI\_Square.DeviceTag::ID})),“ERR”) But i’m curious why i got that error