What Is Java Stack In Sap Basis

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Support package stacks allow you to keep productive applications up to date on a regular basis with a minimal cost of ownership. The introduction of minimum support package stack levels gives you more flexibility in planning your maintenance activities by reducing the. In older version the basic SAP platform is called as basis. Using Sap NetWeaver the productivity and efficiency of an Organization can be improved a lot. SAP NetWeaver supports several technologies like Microsoft.NET, Oracle Java EE, and IBM Web Sphere for customizations. ABAP stack is used to run ERP applications mainly MM,SD,FICO etc. Java is being opt for Java bases applications or srvices. Java Stack is mainly used for SAP Portals and you can host Internet/Web based application written in JSP/EJB,Java Stack uses Java Threads to run application, ABAP stack contains: IE, BPE Java stack contains: SLD, IR, ID. In a dual stack system we can logon to the ABAP system and unlock the users (ABAP and Java) via transaction SU01. In a Java-only system we have to use the Netweaver Administrator (NWA) or Visual Admin to unlock any user. But if all Admin users in a Java-only system are locked then we have to activate the emergency user SAP. to unlock them.

Solution Manager 7.2 SP 08,NW 7.4 Upgrade – VII– Java Stack

Before starting with the migration of the java stack , make sure java stack is upgraded to latest version. In this blog I have explained the procedure on how to upgrade java stack using SUM(Software Update Manager) tool

Here I would like to throw some light on Software Update Manager (SUM)

The Software Update Manager (SUM) is a multi-purpose tool that supports various processes, such as performing a release upgrade, installing enhancement packages, applying Support Package Stacks, installing add-ons, or updating single components.

Please visit the central page of SL toolset http://support.sap.com/sltoolset

Navigate to the separate page Software Update Manager:

Here you can find the SUM central note, the SUM guide and the Download Link.

Since 11.09.2017 SUM tool is offered in two versions:

  • SUM 2.0 is for ABAP single stacks, targeting systems based on BASIS 7.50 and higher
    (exception: SUM 2.0 is used for ZDO even if target is BASIS 7.40 or lower)
  • SUM 1.0 is always used if the source system is either a dual-stack system, or a Java stack
  • SUM 1.0 is used for ABAP stack if target is based on BASIS 7.40 or lower

The SUM guide can be downloaded from the SAP Support Portal page Software Update Manager

Sample SUM guides:

First download the latest SUM tool from SAP Support Portal and place it in a respective folder and extract the SUM tool using SAPCAR utility as shown below.

Now go to path where the SUM tool has been extracted.(…./SUM)

Give command to start SUM tool

./STARTUP confighostagent <SID>

SUM Java URL: http://<hostname>:1128/lmsl/sumjava/<SID>/index.html

Login to SUM tool with <sid>adm credentials

Provide the stack Configuration file path and click next

It gave error some of the archives defined in the stack configuration file missing.

Open TargetSystemVersionReport.html , it will show you the list of missing files.

Sap basis responsibility

For example

What Is Java Stack In Sap Basis

Download the missing files and place it in the download directory where all the files are copied.

Now run SUM and click next

Download the file crlbag.p7s and place it in the download directory where all the files are copied.

Click Next

What Is Java Stack In Sap Basis

Click Next and the Configuration Phase starts as shown below

Provide username and password details and click Next

No valid Maintenance Certificate found on AS Java with SID <SID>

Apply the maintenance certificate and click Next

Verify the details and Click Next

Next Checks Phase starts

Next Preprocessing Phase starts

Next Downtime Phase begins

To be on safer side, Backup the Directory /usr/sap/<SID> and backup your database

Click Next and it enters the execution phase

This Deployed component IAIKSecurityFS takes bit long time

Sap Java Stack

To resolve above error , increase space on FS /usr/sap/<SID> and restart java stack system

Click Next

Sap Basis Administrator

To resolve above error,Unlock the j2ee_admin user and click Next

Downtime phase completed and click next we enter Post Processing Phase

Click Next

What Is Java Stack In Sap Basis Costing

Java system upgrade finished successfully. Now lets proceed with the migration of Java system from Oracle to Hana database using SWPM (Software Provisioning Manager) tool with heterogeneous export import method , I have explained the same in the next blog please find the below link for continuation.