Help in troubleshooting java.lang.NullPointerException in a BR

[bipworld]

Hi Friends,

I am trying to customize OOB BR "user_query" on sys_user table to allow listing of all users(active+inactive) when URL consists of certain texts. I configured BR like this:

if(gs.action)
	var uri = gs.action.getGlideURI().toString();

if(typeof uri  != "undefined" && ((uri.indexOf('getReqFor') > -1) || (uri.indexOf('sc_cart.requested_for') > -1) || (uri.indexOf('catalog_default') > -1)  || (uri.indexOf('com.glideapp.servicecatalog_cat_item') > -1)))
	current.getUniqueValue(); //This is just a placeholder for IF, not using this code's output anywhere.
else
	current.addActiveQuery();

However I recieve occassional java.lang.NullPointerException.

During troubleshooting I tried following:

1. Put a check for validating if "gs.action" contains some value.

2. Put a check for validating if "gs.action.getGlideURI()" contains some value.

3. Noticed that the error always comes when "AMB_RECEIVE-thread" is calling the script.

2018-11-23 08:09:43 (363) AMB_RECEIVE-thread-39 FF74080035C66B0003158E4BCB442BB4 Couldn't decipher the stack trace resulting from the following JavaScriptException:
2018-11-23 08:09:43 (364) AMB_RECEIVE-thread-39 FF74080035C66B0003158E4BCB442BB4 SEVERE *** ERROR *** java.lang.NullPointerException
org.mozilla.javascript.JavaScriptException: java.lang.NullPointerException
        at org.mozilla.javascript.Context.makeJavaScriptException(Context.java:1925)
        at org.mozilla.javascript.Context.throwAsScriptRuntimeEx(Context.java:1911)
        at org.mozilla.javascript.MemberBox.invoke(MemberBox.java:143)
        at org.mozilla.javascript.NativeJavaMethod.call(NativeJavaMethod.java:292)
        at org.mozilla.javascript.ScriptRuntime.doCall(ScriptRuntime.java:2585)
        at org.mozilla.javascript.optimizer.OptRuntime.callProp0(OptRuntime.java:85)
        at org.mozilla.javascript.gen.sys_script_62a7bfaf0a0a0a6500c49682bd82376a_script_10165._c_script_0(sys_script.62a7bfaf0a0a0a6500c49682bd82376a.script:1)
        at org.mozilla.javascript.gen.sys_script_62a7bfaf0a0a0a6500c49682bd82376a_script_10165.call(sys_script.62a7bfaf0a0a0a6500c49682bd82376a.script)
        at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:563)
        at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3421)
        at org.mozilla.javascript.gen.sys_script_62a7bfaf0a0a0a6500c49682bd82376a_script_10165.call(sys_script.62a7bfaf0a0a0a6500c49682bd82376a.script)
        at org.mozilla.javascript.gen.sys_script_62a7bfaf0a0a0a6500c49682bd82376a_script_10165.exec(sys_script.62a7bfaf0a0a0a6500c49682bd82376a.script)
        at com.glide.script.ScriptEvaluator.execute(ScriptEvaluator.java:263)
        at com.glide.script.ScriptEvaluator.evaluateString(ScriptEvaluator.java:110)
        at com.glide.script.ScriptEvaluator.evaluateString(ScriptEvaluator.java:76)
        at com.glide.script.fencing.GlideScopedEvaluator.evaluateScript(GlideScopedEvaluator.java:343)
        at com.glide.script.fencing.GlideScopedEvaluator.evaluateScript(GlideScopedEvaluator.java:263)
        at com.glide.script.fencing.GlideScopedEvaluator.evaluateScript(GlideScopedEvaluator.java:250)
        at com.glide.script.BusinessRule.runScript(BusinessRule.java:403)
        at com.glide.script.BusinessRule.runSyncBusinessRule(BusinessRule.java:293)
        at com.glide.script.BusinessRule.runBusinessRule(BusinessRule.java:204)
        at com.glide.script.BusinessRule.run(BusinessRule.java:180)
        at com.glide.script.GlideRecordBusinessRules.run(GlideRecordBusinessRules.java:87)
        at com.glide.script.GlideRecord.runScripts(GlideRecord.java:1298)
        at com.glide.script.GlideRecord.addBeforeQueryRules(GlideRecord.java:3288)
        at com.glide.script.GlideRecord.prepQuery(GlideRecord.java:3275)
        at com.glide.script.GlideRecord.query0(GlideRecord.java:3165)
        at com.glide.script.GlideRecord.get(GlideRecord.java:1641)
        at com.glide.amb.server.AMBGlideRecordSerializer.deserializeRecord(AMBGlideRecordSerializer.java:60)
        at com.glide.amb.server.AMBGlideRecordReceiveValidator.send(AMBGlideRecordReceiveValidator.java:39)
        at org.cometd.server.ServerSessionImpl.notifySend(ServerSessionImpl.java:763)
        at org.cometd.server.ServerSessionImpl.extendSendMessage(ServerSessionImpl.java:751)
        at org.cometd.server.ServerSessionImpl.doDeliver(ServerSessionImpl.java:254)
        at com.glide.amb.server.GlideCometdServerSessionImpl.handleDeferral(GlideCometdServerSessionImpl.java:41)
        at com.glide.amb.server.AbstractAMBContext.handleDeferral(AbstractAMBContext.java:233)
        at com.glide.amb.server.GlideAMBProcessor.process(GlideAMBProcessor.java:16)
        at com.glide.processors.AProcessor.runProcessor(AProcessor.java:474)
        at com.glide.processors.AProcessor.processTransaction(AProcessor.java:199)
        at com.glide.processors.ProcessorRegistry.process0(ProcessorRegistry.java:178)
        at com.glide.processors.ProcessorRegistry.process(ProcessorRegistry.java:167)
        at com.glide.ui.GlideServletTransaction.process(GlideServletTransaction.java:31)
        at com.glide.sys.Transaction.run(Transaction.java:2037)
        at com.glide.amb.server.AMBTransaction.run(AMBTransaction.java:25)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)

2018-11-23 08:09:43 (366) AMB_RECEIVE-thread-39 FF74080035C66B0003158E4BCB442BB4 SEVERE *** ERROR *** JavaScript evaluation error on:
if(gs.action.getGlideURI())
        var uri = gs.action.getGlideURI().toString();

if(typeof uri  != "undefined" && (uri.indexOf('getReqForAndCostCenter') > -1 || uri.indexOf('sc_cart.requested_for') > -1 || uri.indexOf('catalog_default') > -1  || uri.indexOf('com.glideapp.servicecatalog_cat_item') > -1))
        current.getUniqueValue(); //DO NOTHING
else
        current.addActiveQuery();
Root cause of JavaScriptException: java.lang.NullPointerException

java.lang.NullPointerException

However unable to tracedown which line or piece of code in BR could be causing this error.

PS> I do not get error when I manaully run the code. It only happens when AMB_RECEIVE-thread is involved.

Could someone help me troubleshoot this?

[bipworld]

Got this document explaining the cause :

KB0623094

Now I need to know another way to get URL in Business Rule, could someone help?

[Kalaiarasan Pus]

Try adding these conditions and see if that helps.

gs.action != ''

gs.getSession().isInteractive()

[bipworld]

Thanks for your reply.

OOB BR user_query has gs.getSession().isInteractive() set in condition field so it should not execute if the value is false anyway.

and validating gs.action I already checked, it did not work.

[bipworld · Accepted solution]

Adding this check before the 'if' block fixed the issue:

/* FIX - Start */
var ref = GlideTransaction.get().getRequest().getHeader("referer");
if(ref && ref.indexOf('http'));
	var uri = gs.action.getGlideURI().toString();
/* FIX - End */
if(typeof uri  != "undefined" && ((uri.indexOf('getReqFor') > -1) || (uri.indexOf('sc_cart.requested_for') > -1) || (uri.indexOf('catalog_default') > -1)  || (uri.indexOf('com.glideapp.servicecatalog_cat_item') > -1)))
	current.getUniqueValue(); //This is just a placeholder for IF, not using this code's output anywhere.
else
	current.addActiveQuery();