# Error assigning value to global variable

**URL:** <https://forum.servoy.com/t/error-assigning-value-to-global-variable/1310>\
**Category:** Classic Servoy\
**Created:** [February 20, 2004, 8:25am UTC](https://forum.servoy.com/t/error-assigning-value-to-global-variable/1310 "2004-02-20T08:25:00Z")\
**Posts on this page:** 7\
**Page:** 1

<div class="post-metadata">

**Author:** ![shaikna](https://avatars.discourse-cdn.com/v4/letter/s/ac91a4/32.png) [@shaikna](https://forum.servoy.com/u/shaikna)\
**Post date:** [February 20, 2004, 8:25am UTC](https://forum.servoy.com/t/error-assigning-value-to-global-variable/1310/1 "2004-02-20T08:25:00Z")

</div>

I recently upgraded to rc6. It causes an error to my logic which was working well during the earlier version. My logic is,

In my linking form, I got 2 portals. Left (availbale list) and right (linked list). I got 2 buttons to move records in between them. (You might have seen such logic in lots of applications). Okay, it is working fine until I move all left (availbale) portal records to right (linked) portal. When I move it back, it gives out an error. The error is,

To move between portals, firstly I am getting the portal field value to a local variable. Then assign this local variable to a global variable. _ **The error is capturing at this point, i.e. at assigning local variable to that global variable** _. (strange??? all are integer and working well until before rc6). It throws “null pointer exception”. Any clue?.

* * *

shaikna - Hong Kong

---

<div class="post-metadata">

**Author:** ![jcompagner](https://yyz2.discourse-cdn.com/flex010/user_avatar/forum.servoy.com/jcompagner/32/4889_2.png) [@jcompagner](https://forum.servoy.com/u/jcompagner)\
**Post date:** [February 21, 2004, 9:13am UTC](https://forum.servoy.com/t/error-assigning-value-to-global-variable/1310/2 "2004-02-21T09:13:25Z")

</div>

i have to see the complete stacktrace (see .log.txt file in servoy dir)  
also do you have an example that i can test

---

<div class="post-metadata">

**Author:** ![shaikna](https://avatars.discourse-cdn.com/v4/letter/s/ac91a4/32.png) [@shaikna](https://forum.servoy.com/u/shaikna)\
**Post date:** [February 21, 2004, 6:03pm UTC](https://forum.servoy.com/t/error-assigning-value-to-global-variable/1310/3 "2004-02-21T18:03:33Z")

</div>

Below quoted is the one I got in .log.txt

> Starting Servoy R2 2.0 rc6 build-265 on Windows XP using Java 1.4.2\_03java.lang.NullPointerExceptionjava.lang.NullPointerException  
> at com.servoy.j2db.dataprocessing.h.getValue(Unknown Source)  
> at com.servoy.j2db.dataprocessing.t.a(Unknown Source)  
> at com.servoy.j2db.dataprocessing.v.a(Unknown Source)  
> at com.servoy.j2db.dataprocessing.h.if(Unknown Source)  
> at com.servoy.j2db.dataprocessing.h.a(Unknown Source)  
> at com.servoy.j2db.dataprocessing.c.if(Unknown Source)  
> at com.servoy.j2db.dataprocessing.c.do(Unknown Source)  
> at com.servoy.j2db.dataprocessing.h.setValue(Unknown Source)  
> at com.servoy.j2db.dataprocessing.h.put(Unknown Source)  
> at com.servoy.j2db.dataprocessing.FoundSet.put(Unknown Source)  
> at org.mozilla.javascript.ScriptRuntime.setProp(ScriptRuntime.java:839)  
> at org.mozilla.javascript.Interpreter.interpret(Interpreter.java:1832)  
> at org.mozilla.javascript.InterpretedFunction.call(InterpretedFunction.java:94)  
> at com.servoy.j2db.scripting.e.call(Unknown Source)  
> at com.servoy.j2db.develop.c.i.executeFunction(Unknown Source)  
> at com.servoy.j2db.FormPanel.a(Unknown Source)  
> at com.servoy.j2db.FormPanel.actionPerformed(Unknown Source)  
> at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)  
> at javax.swing.AbstractButton$ForwardActionEvents.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 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.dispatchEvent(Unknown Source)  
> at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)  
> at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)  
> at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)  
> at java.awt.Dialog$1.run(Unknown Source)  
> at java.awt.Dialog.show(Unknown Source)  
> at java.awt.Component.show(Unknown Source)  
> at java.awt.Component.setVisible(Unknown Source)  
> at com.servoy.j2db.util.b.setVisible(Unknown Source)  
> at com.servoy.j2db.f.setVisible(Unknown Source)  
> at com.servoy.j2db.f.a(Unknown Source)  
> at com.servoy.j2db.FormManager.a(Unknown Source)  
> at com.servoy.j2db.scripting.JSApplication.js\_showFormInDialog(Unknown Source)  
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)  
> at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)  
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)  
> at java.lang.reflect.Method.invoke(Unknown Source)  
> at org.mozilla.javascript.NativeJavaMethod.call(NativeJavaMethod.java:289)  
> at org.mozilla.javascript.ScriptRuntime.call(ScriptRuntime.java:1232)  
> at org.mozilla.javascript.Interpreter.interpret(Interpreter.java:1940)  
> at org.mozilla.javascript.InterpretedFunction.call(InterpretedFunction.java:94)  
> at com.servoy.j2db.scripting.e.call(Unknown Source)  
> at com.servoy.j2db.develop.c.i.executeFunction(Unknown Source)  
> at com.servoy.j2db.FormPanel.a(Unknown Source)  
> at com.servoy.j2db.FormPanel.actionPerformed(Unknown Source)  
> at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)  
> at javax.swing.AbstractButton$ForwardActionEvents.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 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.dispatchEvent(Unknown Source)  
> at java.awt.EventDispatchThread.pumpOneEventForHierarchy(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)

---

<div class="post-metadata">

**Author:** ![jcompagner](https://yyz2.discourse-cdn.com/flex010/user_avatar/forum.servoy.com/jcompagner/32/4889_2.png) [@jcompagner](https://forum.servoy.com/u/jcompagner)\
**Post date:** [February 21, 2004, 6:17pm UTC](https://forum.servoy.com/t/error-assigning-value-to-global-variable/1310/4 "2004-02-21T18:17:44Z")

</div>

that is very strange..  
that latest getValue call is called all the time and i have no idee why it is throwing an null ..

but it doesn’t have anything to do with a global.. Because you are storing a record dataprovider at the momenet of the nullpointer.

so i have to have a reproduceable testcase to track this down.

---

<div class="post-metadata">

**Author:** ![shaikna](https://avatars.discourse-cdn.com/v4/letter/s/ac91a4/32.png) [@shaikna](https://forum.servoy.com/u/shaikna)\
**Post date:** [February 25, 2004, 9:03am UTC](https://forum.servoy.com/t/error-assigning-value-to-global-variable/1310/5 "2004-02-25T09:03:25Z")

</div>

Here is my reproduceable case. The zip file contains basekite.gdb & \*\*\*.servoy. create a db server “basekite” for that gdb and import the solution and test it. thanks.

---

<div class="post-metadata">

**Author:** ![jcompagner](https://yyz2.discourse-cdn.com/flex010/user_avatar/forum.servoy.com/jcompagner/32/4889_2.png) [@jcompagner](https://forum.servoy.com/u/jcompagner)\
**Post date:** [February 25, 2004, 1:41pm UTC](https://forum.servoy.com/t/error-assigning-value-to-global-variable/1310/6 "2004-02-25T13:41:44Z")

</div>

and when do i get that error?  
(remember i am testing it on RC7 now)

---

<div class="post-metadata">

**Author:** ![shaikna](https://avatars.discourse-cdn.com/v4/letter/s/ac91a4/32.png) [@shaikna](https://forum.servoy.com/u/shaikna)\
**Post date:** [February 25, 2004, 5:33pm UTC](https://forum.servoy.com/t/error-assigning-value-to-global-variable/1310/7 "2004-02-25T17:33:11Z")

</div>

In RC7, it is okay for me too.

As I said earlier, I was getting that problem only in RC6. I haven’t got that in prior release. So, I presume it might be a bug in RC6 only.