how java instance processes starts?or how java startup and
control frame work starts the java instance?



how java instance processes starts?or how java startup and control frame work starts the java insta..

Answer / vikram

Java Startup process. (JCONTROL and JLAUNCH :- JControl
starts JLaunch)
Sequence
1. Database is Started : Database must be operational before
SAP is started.
2. Central Services is Started : Java Central services which
includes the message service, enqueue service are started.
3. Central Instance is started : Now the Java Central
Instance which includes the services like Dispatcher, Server
process and SDM is started by “Start and Control Framework”

The Start procedure in the Startup and Control Framework
3.1 JControl is started by the startup script.
3.2 JControl creates a connection to the message server (on
the CS).
3.3 JControl starts a Java Instance bootstrap process with
parameters that are defined in the file bootstrap.properties
(/usr/sap/SID/instance/j2ee/cluster/bootstrap). The
bootstrap process synchronize all required binaries for the
Java Nodes from the database with the file system. This is
necessary, since the Class Loading is performed using the
file system in the Java environment. The database always
contains the current (deployed) binaries and properties and
distributes these to every java node when starting.
3.4 The java instance bootstrap process reads the instance
description from the java schema of the database.
3.5 The java instance bootstrap process stores a file
instance.properties, containing the instance description, at
operating system level.
3.6 JControl start the instance description from the file
system.
3.7 JControl starts the specified bootstrap processes for
java nodes. Then JControl starts all java nodes such as
dispatchers and servers as JLaunch processes and, when doing
so, loads a JVM in the JLaunch process.


--->>> If an ABAP instance is started with an additional
Java Instance, the ABAP dispatcher uses a signal from the
ABAP dispatcher process to run a start command on the
Startup and control Framework.

Every time Java instance is started it will create a
instance.properties file (
/usr/sap/SID/instance_name/j2ee/cluster/instance.properties
), which is used for synchronizing the information with the
database. The instance profile contains A service called
Jcontrol will start initially which in turn will start
Jlaunch process. There would be as many as jlaunch processes
as many there are server process like dispatcher process,
Server process, SDM. For each instance it will start one
jcontrol and atleast 2 jlaunch process (dispatcher and
Server process).

Central services (Message Service and Enqueue Service) are
not started by jcontrol process. Java’s instance profile is
not used for any configuration, here the configurations are
done in services which are modified by either tool called
“Configtool” or “Visual Administrator”.

4. Java Additional Dialog instances are Started : Other
Dialog instance is started here.

Is This Answer Correct ?    9 Yes 0 No

Post New Answer

More SAP Basis Interview Questions

What is a background processing batch scheduler?

0 Answers  


What happens when in background when we shutdown SAP (Both central & Database) & where is the log stored. Also when we apply the Patches, what exactly is running in background.. Kindly help me with this answer..

4 Answers  


What are the 2 systems in Solution Manager Landscape

2 Answers  


what is data dictionary objecst?

1 Answers  


What are the scripts you can create for security by using LSMW??

0 Answers   Accenture, Wipro,






what are the pre-requisites to apply support patch?

0 Answers  


During Client Copy from Production(400) to Development(500) Ztables data of PRD server not copied ?

1 Answers   ISPL,


how to change the owner of a file in unix

3 Answers   iGate,


how to know if there are expensive sql statements running?what will you do then to improve the response time?

3 Answers   Atos Origin,


Are control and status records are different for each IDOC type?(true or false)

1 Answers   IBM,


I need to change the Company address parameters of a user. The path is SU01 -> <Username> -> Change - > Address Tab - > Display Icon in Company Address section. In the new screen, i see a preview section icon; on clicking which, I can change the parameters such as "Sending Country"; "Street/PO Box number" and number of lines in the resulting pop up. Here though i change the parameter "Street/PO Box number" field to 'S' ( Street has priority over PO Box), its changing again to 'P' (PO Box has priority over street) only. In the help section it is written that if we set the user parameter (tcode SU3) LND1 to the desired country we can control the user specific Sending Country with the desired value else it takes the Sending Country of the Company defined by default. But no such parameter has been given for Street/PO Box number so that we could change its value atleast there. Someone suggest me how to change the Street/PO Box number of the Address format for a user to the desired value.

0 Answers   Wipro,


What is the purpose of support package?

0 Answers  


Categories
  • SAP Basis Interview Questions SAP Basis (1262)
  • SAP ABAP Interview Questions SAP ABAP (3939)
  • SAPScript Interview Questions SAPScript (236)
  • SAP SD (Sales & Distribution) Interview Questions SAP SD (Sales & Distribution) (2716)
  • SAP MM (Material Management) Interview Questions SAP MM (Material Management) (911)
  • SAP QM (Quality Management) Interview Questions SAP QM (Quality Management) (99)
  • SAP PP (Production Planning) Interview Questions SAP PP (Production Planning) (523)
  • SAP PM (Plant Maintenance) Interview Questions SAP PM (Plant Maintenance) (252)
  • SAP PS (Project Systems) Interview Questions SAP PS (Project Systems) (138)
  • SAP FI-CO (Financial Accounting & Controlling) Interview Questions SAP FI-CO (Financial Accounting & Controlling) (2766)
  • SAP HR (Human Resource Management) Interview Questions SAP HR (Human Resource Management) (1180)
  • SAP CRM (Customer Relationship Management) Interview Questions SAP CRM (Customer Relationship Management) (432)
  • SAP SRM (Supplier Relationship Management) Interview Questions SAP SRM (Supplier Relationship Management) (132)
  • SAP APO (Advanced Planner Optimizer) Interview Questions SAP APO (Advanced Planner Optimizer) (92)
  • SAP BW (Business Warehouse) Interview Questions SAP BW (Business Warehouse) (896)
  • SAP Business Workflow Interview Questions SAP Business Workflow (72)
  • SAP Security Interview Questions SAP Security (597)
  • SAP Interfaces Interview Questions SAP Interfaces (74)
  • SAP Netweaver Interview Questions SAP Netweaver (282)
  • SAP ALE IDocs Interview Questions SAP ALE IDocs (163)
  • SAP Business One Interview Questions SAP Business One (110)
  • SAP BO BOBJ (Business Objects) Interview Questions SAP BO BOBJ (Business Objects) (388)
  • SAP CPS (Central Process Scheduling) Interview Questions SAP CPS (Central Process Scheduling) (14)
  • SAP GTS (Global Trade Services) Interview Questions SAP GTS (Global Trade Services) (21)
  • SAP Hybris Interview Questions SAP Hybris (132)
  • SAP HANA Interview Questions SAP HANA (700)
  • SAP PI (Process Integration) Interview Questions SAP PI (Process Integration) (113)
  • SAP PO (Process Orchestration) Interview Questions SAP PO (Process Orchestration) (25)
  • SAP BI (Business Intelligence) Interview Questions SAP BI (Business Intelligence) (174)
  • SAP BPC (Business Planning and Consolidation) Interview Questions SAP BPC (Business Planning and Consolidation) (38)
  • SAP BODS (Business Objects Data Services) Interview Questions SAP BODS (Business Objects Data Services) (49)
  • SAP BODI (Business Objects Data Integrator) Interview Questions SAP BODI (Business Objects Data Integrator) (26)
  • SAP Ariba Interview Questions SAP Ariba (9)
  • SAP Fiori Interview Questions SAP Fiori (45)
  • SAP EWM (Extended Warehouse Management) Interview Questions SAP EWM (Extended Warehouse Management) (58)
  • Sap R/3 Interview Questions Sap R/3 (150)
  • SAP FSCM Financial Supply Chain Management Interview Questions SAP FSCM Financial Supply Chain Management (101)
  • SAP WM (Warehouse Management) Interview Questions SAP WM (Warehouse Management) (31)
  • SAP GRC (Governance Risk and Compliance) Interview Questions SAP GRC (Governance Risk and Compliance) (64)
  • SAP MDM (Master Data Management) Interview Questions SAP MDM (Master Data Management) (0)
  • SAP MRS (Multi Resource Scheduling) Interview Questions SAP MRS (Multi Resource Scheduling) (0)
  • SAP ESS MSS (Employee Manager Self Service) Interview Questions SAP ESS MSS (Employee Manager Self Service) (13)
  • SAP CS (Customer Service) Interview Questions SAP CS (Customer Service) (0)
  • SAP TRM (Treasury and Risk Management) Interview Questions SAP TRM (Treasury and Risk Management) (0)
  • SAP Web Dynpro ABAP Interview Questions SAP Web Dynpro ABAP (198)
  • SAP IBP (Integrated Business Planning) Interview Questions SAP IBP (Integrated Business Planning) (0)
  • SAP OO-ABAP (Object Oriented ABAP) Interview Questions SAP OO-ABAP (Object Oriented ABAP) (70)
  • SAP S/4 HANA Finance (Simple Finance) Interview Questions SAP S/4 HANA Finance (Simple Finance) (143)
  • SAP FS-CD (Collections and Disbursements) Interview Questions SAP FS-CD (Collections and Disbursements) (0)
  • SAP PLM (Product Lifecycle Management) Interview Questions SAP PLM (Product Lifecycle Management) (0)
  • SAP SuccessFactors Interview Questions SAP SuccessFactors (33)
  • SAP Vistex Interview Questions SAP Vistex (0)
  • SAP ISR (IS Retail) Interview Questions SAP ISR (IS Retail) (28)
  • SAP IdM (Identity Management) Interview Questions SAP IdM (Identity Management) (0)
  • SAP IM (Investment Management) Interview Questions SAP IM (Investment Management) (0)
  • SAP UI5 Interview Questions SAP UI5 (59)
  • SAP SCM (Supply Chain Management) Interview Questions SAP SCM (Supply Chain Management) (51)
  • SAP XI (Exchange Infrastructure) Interview Questions SAP XI (Exchange Infrastructure) (49)
  • SAP Cloud Platform Interview Questions SAP Cloud Platform (34)
  • SAP Testing Interview Questions SAP Testing (89)
  • SAP SolMan (Solution Manager) Interview Questions SAP SolMan (Solution Manager) (63)
  • SAP MaxDB Interview Questions SAP MaxDB (116)
  • SAP GUI Interview Questions SAP GUI (15)
  • SAP AllOther Interview Questions SAP AllOther (329)