Java Quick Notes

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  Sample Img 1

Thread Dump is nothing but a snap shot of your JVM process at a Given Point of Time.
Usually we take Thread Dump to pinpoint the issue (identifying the root cause) when the
Application hung or unresponsive or the performance of the application is unexpectedly low.
Thread Dump provides you the list of Threads with a stacktarce of operations currently
they are performing.

Should do the following to capture the Thread Dump:

Unix:
Find process id as follows
             ps -ef | grep java
 Perform Kill -3 on java process.
            Kill -3 <java process id>

Windows:
      Press ctrl+break

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You may need to find the Java Process Id in Server Box for taking Thread Dump or
restarting the App Server without using Stop server script.

Simply use ps command to get the process id as follows:

ps aux | grep Java

Or

ps -ef | grep java

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To tail the logs in Unix or Linux please use the following command. The following
command prints the last 1000 lines of the given log file.

Tail -1000f  test.log

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find . -type f -exec grep -l "yourword" {} +

Or
 
find . -exec grep "yourword" '{}' \; -print

Or
 
find /path/to/dir -type f | xargs grep -l "yourword"

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sudo -u druser -s

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df - k

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Removing the Dir

rm -rf    temp  

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ls -lrt

Output would looks like this.

drwxr-xr-x 3 testfile writers 80 2005-09-22 21:40 dir

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chmod a=r testfile 

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There are so many instances you may want to Kill the Java Process for restarting the Servers.

Step 1:

ps -ef | grep java

Step 2:

kill -9 <process id>

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This is sample Shell Script gives us an idea on how to write a
Shell Script to Run a Java Class which could be a Batch Job.

YOURAPP_LIB_HOME=$HOME/lib
JDBC_LIB=/export/apps/oracli/cust/10.1.0.3/jdbc/lib
JAVA_HOME=/export/appl/gt-tools/j2sdk1.4.2_12

export YOURAPP_LIB_HOME JDBC_LIB JAVA_HOME
PATH=/usr/SYSADM/bin:/usr/sbin:.:/export/apps/sched/autosys/bin:/export/apps/sched/local/bin:
/export/apps/sched/local/sbin:/export/apps/sched/local/arch/bin:/export/apps/sched/local/arch/sbin:/usr/SYSADM/bin:/export/appl:$JAVA_HOME/bin

CLASSPATH=$CLASSPATH:$JAVA_HOME/lib/tools.jar:$YOURAPP_LIB_HOME/activation.jar:$YOURAPP_LIB_HOME/mail.jar:$HOME/bin:$JDBC_LIB/classes12.jar
export PATH CLASSPATH
echo $PATH
echo $CLASSPATH
java com.salesorder.batchjob.DataSync

public class DataSync {

}

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This is sample Shell Script gives us an idea on how to write a
Shell Script to Run a SQL Script.

Please examples meant for giving an idea , you need to customize these
your needs.

RunSQL.sh:

 setenv ORACLE_HOME /export/apps/oracli/cust/10.1.0.3
 setenv TNS_ADMIN /export/apps/oracli/cust/admin/network
 setenv PATH /export/apps/oracli/cust/10.1.0.3/bin:${PATH}
 setenv  LD_LIBRARY_PATH /export/apps/oracli/cust/10.1.0.3/lib

sqlplus @[DB_USER]@@[DB_INSTANCE_NAME]/@[DB_PWD] @$HOME/bin/ProductLoad.sql

 ProductLoad.sql :

delete "SalesOrder"."SELR_SRVR";

insert into  "SalesOrder"."SELR_SRVR"
select unique PRODUCT_ID, PRODUCT_NME,NVL(SUBSTR(ENTY_NO,1,5),PRODUCT_ID),NVL(ENTY_NME,SUBSTR(PRODUCT_NME,1,60)),
PRNT_SELR_STAT,PRNT_SRVR_STAT  from SalesOrder.X_SELR_SRVR_STGG
where PRNT_SELR_STAT = 3 or "PRNT_SRVR_STAT" = 5;

exit

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Ans)

Sample AUTOSYS jil file

This is a sample AUTOSYS file gives us an idea on how to write a
AUTOSYS .jil

Please examples meant for giving an idea , you need to customize these
your needs.

Assume that you have ProductLoad.sh which loads that product data into your
Application DB and that should be run everyday at 5:00 AM

------------------------------------------------------------------------

delete_box:       appDev#box#ProductLoad

insert_job:       appDev#box#ProductLoad
job_type:         box
description:      Run Product Load Box
owner:            @[DB_USER]
machine:          @[AUTOSYS_SERVER]
permission:       gx,wx
date_conditions:  yes
days_of_week:     all
start_times:      "05:00"
condition:        notrunning(appDev#box#ProductLoad)

      insert_job:       appDev#cmd#ProductLoad
      job_type:         command
      description:      Run ProductLoad Script
      box_name:         appDev#box#ProductLoad
      owner:            @[DB_USER]
      machine:          @[AUTOSYS_SERVER]
      permission:       gx,wx
      command:          /appl/bin/appDev_ProductLoad.sh
      std_out_file:     /appl/log/appDev#box#ProductLoad.out
      std_err_file:     /appl/log/appDev#box#ProductLoad.err
      min_run_alarm:    0
      max_run_alarm:    30
      job_terminator:   yes
      box_terminator:   yes

update_job:   appDev#box#ProductLoad
box_success: success(appDev#cmd#ProductLoad)

---------------------------------------------------------------

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