# Null Pointer Exception/Error on Window Activated / Opened **URL:** \ **Category:** Ignition\ **Tags:** ignition80, scripting, vision\ **Created:** [April 3, 2020, 7:26am UTC](https://forum.inductiveautomation.com/t/null-pointer-exception-error-on-window-activated-opened/33656 "2020-04-03T07:26:22Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![csanyia](https://avatars.discourse-cdn.com/v4/letter/c/48db29/32.png) [@csanyia](https://forum.inductiveautomation.com/u/csanyia)\ **Post date:** [April 3, 2020, 7:26am UTC](https://forum.inductiveautomation.com/t/null-pointer-exception-error-on-window-activated-opened/33656/1 "2020-04-03T07:26:22Z")
Using this code to load an image from BLOB in the database into the icon field of a label. When the code is attached to a button, it works fine, but I need the code to load the image as soon as the popup window is opened. I’m trying to add the code when the window is activated / opened, but get a null exception: The Code in WindowActivated/WindowOpened ```auto from javax.swing import ImageIcon from java.io import ByteArrayInputStream from javax.imageio import ImageIO from java.awt import Image from java.net import URL from java.io import File image = system.db.runScalarPrepQuery("SELECT image FROM Products where id=15757") bais = ByteArrayInputStream(image) bImageFromConvert = ImageIO.read(bais) lbl3 = event.source.parent.getComponent('Label 29') boundWidth = lbl3.width boundHeight = lbl3.height originalWidth = bImageFromConvert.width originalHeight = bImageFromConvert.height newWidth = originalWidth newHeight = originalHeight if originalWidth > boundWidth: newWidth = boundWidth newHeight = (newWidth * originalHeight) / originalWidth if newHeight > boundHeight: newHeight = boundHeight newWidth = (newHeight * originalWidth) / originalHeight scaledImage = bImageFromConvert.getScaledInstance(newWidth,newHeight,Image.SCALE_SMOOTH) lbl3.setIcon(ImageIcon(scaledImage)) The Error in designer: Traceback (most recent call last): File "", line 10, in at org.python.core.PyJavaType.wrapJavaObject(PyJavaType.java:90) at com.inductiveautomation.factorypmi.application.script.PyComponentWrapper.(PyComponentWrapper.java:57) at com.inductiveautomation.factorypmi.application.script.PyComponentWrapper. __findattr_ex__ (PyComponentWrapper.java:94) at org.python.core.PyObject. __getattr__ (PyObject.java:1025) at org.python.pycode._pyx29.f$0(:24) at org.python.pycode._pyx29.call_function() at org.python.core.PyTableCode.call(PyTableCode.java:171) at org.python.core.PyCode.call(PyCode.java:18) at org.python.core.Py.runCode(Py.java:1614) at com.inductiveautomation.ignition.common.script.ScriptManager.runCode(ScriptManager.java:770) at com.inductiveautomation.factorypmi.application.binding.action.ActionAdapter.runActions(ActionAdapter.java:200) at com.inductiveautomation.factorypmi.application.binding.action.ActionAdapter.invoke(ActionAdapter.java:291) at com.inductiveautomation.factorypmi.application.binding.action.RelayInvocationHandler.invoke(RelayInvocationHandler.java:57) at com.sun.proxy.$Proxy60.internalFrameOpened(Unknown Source) at java.desktop/javax.swing.JInternalFrame.fireInternalFrameEvent(Unknown Source) at java.desktop/javax.swing.JInternalFrame.show(Unknown Source) at java.desktop/java.awt.Component.show(Unknown Source) at java.desktop/java.awt.Component.setVisible(Unknown Source) at java.desktop/javax.swing.JComponent.setVisible(Unknown Source) at com.inductiveautomation.factorypmi.designer.workspace.WindowWorkspace$DesigntimeWindowOpener.openWindow(WindowWorkspace.java:3514) at com.inductiveautomation.factorypmi.application.VisionDesktop.openWindow(VisionDesktop.java:197) at com.inductiveautomation.factorypmi.application.script.builtin.NavUtilities.lambda$openWindowImpl$5(NavUtilities.java:393) at com.inductiveautomation.factorypmi.application.script.builtin.WindowUtilities.doGUIAction(WindowUtilities.java:808) at com.inductiveautomation.factorypmi.application.script.builtin.NavUtilities.openWindowImpl(NavUtilities.java:336) at com.inductiveautomation.factorypmi.application.script.builtin.NavUtilities.openWindow(NavUtilities.java:326) at com.inductiveautomation.factorypmi.application.script.builtin.NavUtilitiesDispatcher.openWindow(NavUtilitiesDispatcher.java:143) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.base/java.lang.reflect.Method.invoke(Unknown Source) java.lang.NullPointerException: java.lang.NullPointerException at org.python.core.Py.JavaError(Py.java:552) at org.python.core.PyTableCode.call(PyTableCode.java:180) at org.python.core.PyCode.call(PyCode.java:18) at org.python.core.Py.runCode(Py.java:1614) at com.inductiveautomation.ignition.common.script.ScriptManager.runCode(ScriptManager.java:770) at com.inductiveautomation.factorypmi.application.binding.action.ActionAdapter.runActions(ActionAdapter.java:200) at com.inductiveautomation.factorypmi.application.binding.action.ActionAdapter.invoke(ActionAdapter.java:291) at com.inductiveautomation.factorypmi.application.binding.action.RelayInvocationHandler.invoke(RelayInvocationHandler.java:57) at com.sun.proxy.$Proxy60.internalFrameOpened(Unknown Source) at java.desktop/javax.swing.JInternalFrame.fireInternalFrameEvent(Unknown Source) at java.desktop/javax.swing.JInternalFrame.show(Unknown Source) at java.desktop/java.awt.Component.show(Unknown Source) at java.desktop/java.awt.Component.setVisible(Unknown Source) at java.desktop/javax.swing.JComponent.setVisible(Unknown Source) at com.inductiveautomation.factorypmi.designer.workspace.WindowWorkspace$DesigntimeWindowOpener.openWindow(WindowWorkspace.java:3514) at com.inductiveautomation.factorypmi.application.VisionDesktop.openWindow(VisionDesktop.java:197) at com.inductiveautomation.factorypmi.application.script.builtin.NavUtilities.lambda$openWindowImpl$5(NavUtilities.java:393) at com.inductiveautomation.factorypmi.application.script.builtin.WindowUtilities.doGUIAction(WindowUtilities.java:808) at com.inductiveautomation.factorypmi.application.script.builtin.NavUtilities.openWindowImpl(NavUtilities.java:336) at com.inductiveautomation.factorypmi.application.script.builtin.NavUtilities.openWindow(NavUtilities.java:326) at com.inductiveautomation.factorypmi.application.script.builtin.NavUtilitiesDispatcher.openWindow(NavUtilitiesDispatcher.java:143) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.base/java.lang.reflect.Method.invoke(Unknown Source) at org.python.core.PyReflectedFunction. __call__ (PyReflectedFunction.java:188) at com.inductiveautomation.ignition.common.script.ScriptManager$ReflectedInstanceFunction. __call__ (ScriptManager.java:519) at org.python.core.PyObject. __call__ (PyObject.java:480) at org.python.core.PyObject. __call__ (PyObject.java:484) at org.python.pycode._pyx5.f$0(:7) at org.python.pycode._pyx5.call_function() at org.python.core.PyTableCode.call(PyTableCode.java:171) at org.python.core.PyCode.call(PyCode.java:18) at org.python.core.Py.runCode(Py.java:1614) at com.inductiveautomation.ignition.common.script.ScriptManager.runCode(ScriptManager.java:770) at com.inductiveautomation.factorypmi.application.binding.action.ActionAdapter.runActions(ActionAdapter.java:200) at com.inductiveautomation.factorypmi.application.binding.action.ActionAdapter.invoke(ActionAdapter.java:291) at com.inductiveautomation.factorypmi.application.binding.action.RelayInvocationHandler.invoke(RelayInvocationHandler.java:57) at com.sun.proxy.$Proxy58.actionPerformed(Unknown Source) at java.desktop/javax.swing.AbstractButton.fireActionPerformed(Unknown Source) at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) at java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) at java.desktop/javax.swing.DefaultButtonModel.setPressed(Unknown Source) at java.desktop/javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source) at java.desktop/java.awt.Component.processMouseEvent(Unknown Source) at java.desktop/javax.swing.JComponent.processMouseEvent(Unknown Source) at java.desktop/java.awt.Component.processEvent(Unknown Source) at java.desktop/java.awt.Container.processEvent(Unknown Source) at java.desktop/java.awt.Component.dispatchEventImpl(Unknown Source) at java.desktop/java.awt.Container.dispatchEventImpl(Unknown Source) at java.desktop/java.awt.Component.dispatchEvent(Unknown Source) at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) at java.desktop/java.awt.Container.dispatchEventImpl(Unknown Source) at java.desktop/java.awt.Window.dispatchEventImpl(Unknown Source) at java.desktop/java.awt.Component.dispatchEvent(Unknown Source) at java.desktop/java.awt.EventQueue.dispatchEventImpl(Unknown Source) at java.desktop/java.awt.EventQueue$4.run(Unknown Source) at java.desktop/java.awt.EventQueue$4.run(Unknown Source) at java.base/java.security.AccessController.doPrivileged(Native Method) at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) at java.desktop/java.awt.EventQueue$5.run(Unknown Source) at java.desktop/java.awt.EventQueue$5.run(Unknown Source) at java.base/java.security.AccessController.doPrivileged(Native Method) at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) at java.desktop/java.awt.EventQueue.dispatchEvent(Unknown Source) at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.desktop/java.awt.EventDispatchThread.run(Unknown Source) Caused by: java.lang.NullPointerException at org.python.core.PyJavaType.wrapJavaObject(PyJavaType.java:90) at com.inductiveautomation.factorypmi.application.script.PyComponentWrapper.(PyComponentWrapper.java:57) at com.inductiveautomation.factorypmi.application.script.PyComponentWrapper. __findattr_ex__ (PyComponentWrapper.java:94) at org.python.core.PyObject. __getattr__ (PyObject.java:1025) at org.python.pycode._pyx29.f$0(:24) at org.python.pycode._pyx29.call_function() at org.python.core.PyTableCode.call(PyTableCode.java:171) ... 72 more Ignition v8.0.8 (b2020021111) Java: Azul Systems, Inc. 11.0.5 ``` Error in vision: ```auto Traceback (most recent call last): File "", line 10, in TypeError: getComponent(): 1st arg can't be coerced to int Ignition v8.0.8 (b2020021111) Java: Azul Systems, Inc. 11.0.5 ``` ---
**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\ **Post date:** [April 3, 2020, 11:45am UTC](https://forum.inductiveautomation.com/t/null-pointer-exception-error-on-window-activated-opened/33656/2 "2020-04-03T11:45:42Z")
`event.source` in a window event is the window. In your button events it is the button. You’ll need something like: ```auto lbl3 = event.source.rootContainer.getComponent('Label 29') ``` Note: please edit your post to properly delimit your pasted code and exception text. Use three backticks together above and below the pasted material so it formats properly. It should look like this in the forum’s editor pane: ``` pasted material ``` ---
**Author:** ![csanyia](https://avatars.discourse-cdn.com/v4/letter/c/48db29/32.png) [@csanyia](https://forum.inductiveautomation.com/u/csanyia)\ **Post date:** [April 3, 2020, 3:14pm UTC](https://forum.inductiveautomation.com/t/null-pointer-exception-error-on-window-activated-opened/33656/3 "2020-04-03T15:14:57Z")
Seems so obvious now, worked like a charm. Thanks! I also edited my original post, to have proper formatting. Thanks again.