5.3.11 Confirming the execution status of a J2EE application

When a message indicating that a timeout occurred in a method in a J2EE application or a message indicating that the thread status is incorrect due to the failure in method cancellation is output, check the execution status of the running J2EE application. Determine whether method cancellation can be executed according to the confirmation results.

To check the execution status, use the server management commands (cjlistthread).

Note that this command can also be used for confirming the stack trace acquired in the case of transition of the thread status. However, a stack trace is not output when the thread status is running. Note that when the thread status is stopping, the stack trace is output multiple times, so the latest stack trace will be output instead of the stack trace of the time of transition.

Also, the threads exceeding the maximum number of concurrent executions specified in the Web container might be displayed in a list.

The execution format and example are described below. For details on the cjlistthread command, see cjlistthread (display thread information) in the uCosminexus Application Server Command Reference Guide.

Execution format

cjlistthread J2EE-server-name

If you specify the -detail option, you can also output the stack trace as details of the running thread information.

cjlistthread J2EE-server-name -detail

Execution example

cjlistthread MyServer -detail

The following is the format of an execution result when the -detail option is specified:

Execution result

Current Time=HH:MM:SS
ThreadID=11111, RootApInfo=RootAP1, Status=timeout, AppName=AP1, StartTime=HH:MM:SS, TimeOut=60
 com.hitachi.XXXX
 at com.hitachi.YYYY
 at user.code.UserClass1
 at com.hitachi.ZZZZ
 .
 .
 .
ThreadID=22222, RootApInfo=RootAP2, Status=stopping, AppName=AP2, StartTime=HH:MM:SS, TimeOut=60
 com.hitachi.xxxx
 at com.hitachi.yyyy
 at user.code.UserClass2
 at com.hitachi.zzzz

The thread status is output after Status = of the execution result.

The following table describes the thread status and the possibility of executing method cancellation:

Table 5‒15: Thread status and the possibility of executing method cancellation

Thread status	Meaning	Possibility of executing method cancellation
running	The execution time is being monitored. Running normally.	Can be executed.
timeout	A timeout is detected depending on the method timeout.	Can be executed.
stopping	The method cancellation process is being executed.	Cannot be executed.
stopped	The method cancellation process is yet to be completed.	Cannot be executed.
failed	The method cancellation process has failed.	Can be executed.

However, a method cannot be canceled even when the thread status indicates that the method can be canceled, if that method is executed in the Protected area. For details on the protected area, see 5.3.4 Method Cancellation.

Tip

The thread information output by this command is the snapshot when the cjlistthread command is executed. Therefore, the thread information changes every moment. Hitachi recommends you to execute the command multiple times and confirm the information for obtaining the accurate thread status.

Note that if you specify the -detail option, the output quantity of the execution result increases. When you specify the -detail option, Hitachi recommends you to set a file as the output destination.

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