Null Pointer Exceptions

[petercambal]

Hello, I am using you library at Linux: Linux ip----*** 4.9.77-31.58.amzn1.x86_64 x86_64 x86_64 x86_64 GNU/Linux

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From time to time I got exception: java.lang.NullPointerException at org.jutils.jprocesses.info.UnixProcessesService.parseList(UnixProcessesService.java:49) at org.jutils.jprocesses.info.AbstractProcessesService.getList(AbstractProcessesService.java:50) at org.jutils.jprocesses.info.AbstractProcessesService.getList(AbstractProcessesService.java:43) at org.jutils.jprocesses.info.AbstractProcessesService.getList(AbstractProcessesService.java:35) at org.jutils.jprocesses.JProcesses.getProcessList(JProcesses.java:136)

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Edit: I found another One java.lang.NullPointerException at org.jutils.jprocesses.info.UnixProcessesService.loadFullCommandData(UnixProcessesService.java:171) at org.jutils.jprocesses.info.UnixProcessesService.parseList(UnixProcessesService.java:88) at org.jutils.jprocesses.info.AbstractProcessesService.getList(AbstractProcessesService.java:50) at org.jutils.jprocesses.info.AbstractProcessesService.getList(AbstractProcessesService.java:43) at org.jutils.jprocesses.info.AbstractProcessesService.getList(AbstractProcessesService.java:35)

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It would be great if you could check this issue, why is this happening and how to prevent this.

[profesorfalken]

Hello,

What happens if you launch from your bash console the following command.?:

ps -e -o pid,command

[petercambal]

It prints list of processes, attributes processID and command. I will put a screenshot below.

[profesorfalken]

Hi,

This is weird. The only thing that can cause this NPE is an error executing the command.

Normally the stack of the IOException should be logged at severe level:

Logger.getLogger(ProcessesUtils.class.getName()).log(Level.SEVERE, null, ex);

Could you check if you have a log somewhere of type: "Cannot run program"... ?

Thanks

[profesorfalken]

Another question. Does it happen systematically?

I have build a new version that should give us more clues.

If you are using maven, just add the dependency as:

<dependency>
         <groupId>org.jprocesses</groupId>
         <artifactId>jProcesses</artifactId>
        <version>1.6.5-SNAPSHOT</version>
  </dependency>

If not, you can download the JAR file directly from here: https://oss.sonatype.org/content/repositories/snapshots/org/jprocesses/jProcesses/1.6.5-SNAPSHOT/jProcesses-1.6.5-20180326.171140-2.jar

[petercambal]

It hapenned 24x over last 4 days, on 4 servers. Others seems fine. I did not notice any log with "Cannot run program" message. I am going to deploy code with new version and I will keep you updated.

Edit: I updated version in maven xml file, but it can not find dependency with this version.