Answer Posted / 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.

How to make security authorization reports?

2068

---

What is the difference between developer trace, system log and system trace?

1206

---

I am attempting to complete a system copy of bw. When I try to go in to rsa1 afterwards I get the error message, "entry in inbound table already exists." What should I do to solve the problem?

1207

---

I need to change the Company address parameters of a user. The path is SU01 -> -> 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.

4999

---

Is it possible to install sap patches when other users are online?

985

---

Explain the architecture of sap system with different layers. What is the use of gateway?

1016

---

Do you have done System copy? What are the steps?

1660

---

How database extend?

1862

---

I want to change five dialog work processes into batch. Where can I do this?

1150

---

How to setup RFC connection in ecc6 tells me steps involved?

2094

---

What is the difference between central instance & application server?

1056

---

Hi I am new in this forum and in this practice. can anyone help me out in finding out how to get training material for SAP CRM 2007.

2128

---

Explain the developer trace?

950

---

What is luw (logical unit of work)?

1100

---

How many types of work processes?

1100

---