uCosminexus Application Server, Operation, Monitoring, and Linkage Guide
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 (Displaying the thread information) in the uCosminexus Application Server Command Reference Guide.
cjlistthread J2EE-server-name |
cjlistthread J2EE-server-name -detail |
cjlistthread MyServer -detail
The following is the format of an execution result when the -detail option is specified:
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.
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