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Bug 369920

Summary:	NPE after opening a change in Task Editor
Product:	z_Archived	Reporter:	Tomasz Zarna <tomasz.zarna>
Component:	Mylyn	Assignee:	Steffen Pingel <steffen.pingel>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	P3
Version:	unspecified
Target Milestone:	1.0
Hardware:	PC
OS:	Windows XP
Whiteboard:
Bug Depends on:
Bug Blocks:	374729

Description Tomasz Zarna

2012-01-27 08:01:57 EST

Mylyn Reviews Connector: Gerrit (Incubation)	0.9.0.I20120125-1403	 org.eclipse.mylyn.gerrit.feature.feature.group	Eclipse Mylyn

What steps will reproduce the problem?
1. Open bug 361548 in Task Editor
2. Go to commit 2 and open I08e1369e in Task Editor
3. Refresh the change (not sure if this is required)

-- Error Details --
Date: Fri Jan 27 13:57:32 CET 2012
Message: An internal error occurred during: "Caching Patch Set Content".
Severity: Error
Product: Eclipse SDK 3.8.0.v201201251800 (org.eclipse.sdk.ide)
Plugin: org.eclipse.core.jobs
Session Data:
eclipse.buildId=I20120125-1800
java.fullversion=JRE 1.6.0 IBM J9 2.4 Windows XP x86-32 jvmwi3260sr7-20091214_49398 (JIT enabled, AOT enabled)
J9VM - 20091214_049398
JIT  - r9_20091123_13891
GC   - 20091111_AA
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=pl_PL
Command-line arguments:  -os win32 -ws win32 -arch x86

Exception Stack Trace:
java.lang.NullPointerException
	at java.util.LinkedHashMap.get(LinkedHashMap.java:324)
	at com.google.gson.LruCache.getElement(LruCache.java:50)
	at com.google.gson.FieldAttributes.getAnnotations(FieldAttributes.java:155)
	at com.google.gson.FieldAttributes.getAnnotation(FieldAttributes.java:145)
	at com.google.gson.SerializedNameAnnotationInterceptingNamingPolicy.translateName(SerializedNameAnnotationInterceptingNamingPolicy.java:44)
	at com.google.gson.JsonObjectDeserializationVisitor.getFieldName(JsonObjectDeserializationVisitor.java:92)
	at com.google.gson.JsonObjectDeserializationVisitor.visitFieldUsingCustomHandler(JsonObjectDeserializationVisitor.java:98)
	at com.google.gson.ObjectNavigator.navigateClassFields(ObjectNavigator.java:158)
	at com.google.gson.ObjectNavigator.accept(ObjectNavigator.java:131)
	at com.google.gson.JsonDeserializationContextDefault.fromJsonObject(JsonDeserializationContextDefault.java:73)
	at com.google.gson.JsonDeserializationContextDefault.deserialize(JsonDeserializationContextDefault.java:51)
	at com.google.gson.Gson.fromJson(Gson.java:568)
	at org.eclipse.mylyn.internal.gerrit.core.client.JSonSupport.parseResponse(JSonSupport.java:205)
	at org.eclipse.mylyn.internal.gerrit.core.client.GerritService.invoke(GerritService.java:106)
	at $Proxy10.patchScript(Unknown Source)
	at org.eclipse.mylyn.internal.gerrit.core.client.GerritClient$7.execute(GerritClient.java:375)
	at org.eclipse.mylyn.internal.gerrit.core.client.GerritClient.execute(GerritClient.java:783)
	at org.eclipse.mylyn.internal.gerrit.core.client.GerritClient.getPatchScript(GerritClient.java:372)
	at org.eclipse.mylyn.internal.gerrit.core.client.GerritClient.getPatchSetContent(GerritClient.java:300)
	at org.eclipse.mylyn.internal.gerrit.ui.editor.GetPatchSetContentJob.run(GetPatchSetContentJob.java:54)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)

Comment 1 Steffen Pingel

2012-03-08 13:36:22 EST

Looks like it's this bug: http://code.google.com/p/google-gson/issues/detail?id=288. I have also seen this happen after we setup tests on ppc64 with a J9 JVM. 

We'll need to consume a newer release of GSon to fix this. It looks like GSon 2.1 has been approved already: https://dev.eclipse.org/ipzilla/show_bug.cgi?id=5923.

Comment 2 Steffen Pingel

2012-03-22 09:19:31 EDT

*** Bug 367588 has been marked as a duplicate of this bug. ***

Comment 3 Steffen Pingel

2012-05-23 06:37:56 EDT

We are now using GSon 2.1 which should have a fix for the described exception.