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https://issues.apache.org/jira/browse/MAPREDUCE-7251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16994234#comment-16994234
 ] 

Hadoop QA commented on MAPREDUCE-7251:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  1m 
12s{color} | {color:blue} Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {color} ||
| {color:green}+1{color} | {color:green} dupname {color} | {color:green}  0m  
0s{color} | {color:green} No case conflicting files found. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green}  0m  
0s{color} | {color:green} The patch does not contain any @author tags. {color} |
| {color:green}+1{color} | {color:green} test4tests {color} | {color:green}  0m 
 0s{color} | {color:green} The patch appears to include 2 new or modified test 
files. {color} |
|| || || || {color:brown} trunk Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 18m 
 7s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 17m 
17s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
49s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m 
22s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
15m 15s{color} | {color:green} branch has no errors when building and testing 
our client artifacts. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 
34s{color} | {color:green} trunk passed {color} |
| {color:blue}0{color} | {color:blue} spotbugs {color} | {color:blue}  2m  
5s{color} | {color:blue} Used deprecated FindBugs config; considering switching 
to SpotBugs. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  2m  
3s{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m 
47s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 16m 
19s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 16m 
19s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
49s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m 
25s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green}  0m 
 0s{color} | {color:green} The patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
12m 46s{color} | {color:green} patch has no errors when building and testing 
our client artifacts. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 
34s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  2m 
11s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:red}-1{color} | {color:red} unit {color} | {color:red}  8m 49s{color} 
| {color:red} hadoop-common in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
53s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black}104m 32s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| Failed junit tests | hadoop.util.TestReadWriteDiskValidator |
|   | hadoop.util.TestDiskCheckerWithDiskIo |
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|| Subsystem || Report/Notes ||
| Docker | Client=19.03.5 Server=19.03.5 base: 
https://builds.apache.org/job/hadoop-multibranch/job/PR-1751/4/artifact/out/Dockerfile
 |
| GITHUB PR | https://github.com/apache/hadoop/pull/1751 |
| JIRA Issue | MAPREDUCE-7251 |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall mvnsite 
unit shadedclient findbugs checkstyle |
| uname | Linux c3851ed19de7 4.15.0-65-generic #74-Ubuntu SMP Tue Sep 17 
17:06:04 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | personality/hadoop.sh |
| git revision | trunk / 93bb368 |
| Default Java | 1.8.0_222 |
| unit | 
https://builds.apache.org/job/hadoop-multibranch/job/PR-1751/4/artifact/out/patch-unit-hadoop-common-project_hadoop-common.txt
 |
|  Test Results | 
https://builds.apache.org/job/hadoop-multibranch/job/PR-1751/4/testReport/ |
| Max. process+thread count | 1372 (vs. ulimit of 5500) |
| modules | C: hadoop-common-project/hadoop-common U: 
hadoop-common-project/hadoop-common |
| Console output | 
https://builds.apache.org/job/hadoop-multibranch/job/PR-1751/4/console |
| versions | git=2.7.4 maven=3.3.9 findbugs=3.1.0-RC1 |
| Powered by | Apache Yetus 0.11.1 https://yetus.apache.org |


This message was automatically generated.



> Present friendlier error for non-static main
> --------------------------------------------
>
>                 Key: MAPREDUCE-7251
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-7251
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>    Affects Versions: 2.9.2
>            Reporter: Connor Taffe
>            Priority: Minor
>
> When running a jar with hadoop jar, e.g. when submitting using gcloud 
> dataproc jobs submit hadoop, a JAR with a non-static main gives a cryptic 
> error message that could be clearer. The current error message in Hadoop 
> 2.9.2 looks like:
> {code:java}
> Exception in thread "main" java.lang.NullPointerException
>   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>   at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
>   at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>   at java.lang.reflect.Method.invoke(Method.java:498)
>   at org.apache.hadoop.util.RunJar.run(RunJar.java:244)
>   at org.apache.hadoop.util.RunJar.main(RunJar.java:158)
>   at 
> com.google.cloud.hadoop.services.agent.job.shim.HadoopRunJarShim.main(HadoopRunJarShim.java:12)
> {code}
> Instead, it would be more helpful to show an error message like "Method main 
> must be static: foo.bar.BazMR".



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