SAP BASIS

Custom Java Tool for Automated SAP Note Downloads via mTLS

SAP_BASIS — Fri, 23 Jan 2026 15:14:14 +0900

1. Introduction & Motivation

In the world of SAP basis and development, downloading SAP Notes is a daily task. However, doing this manually through a browser or using complex wget commands can be tedious, especially when dealing with mTLS (mutual TLS) authentication required by the SAP Support Portal.

To streamline this workflow, I developed SapNoteDownloader—a Java-based GUI application designed to handle certificate-based authentication and batch downloads with ease.

2. Key Features

mTLS Security: Full support for PFX (PKCS12) certificates and password-protected authentication.
Batch Processing: Instead of downloading files one by one, users can simply paste a list of Note numbers to download them all at once.
Standardized Naming: Automatically renames downloaded files to the SAP standard format (e.g., 0001668821_00.SAR).
Modern GUI: A clean, intuitive interface featuring a high-visibility action button and a real-time log console.

3. Technical Deep Dive

① Handling mTLS in Java

The heart of this tool lies in its ability to communicate with SAP's secure servers. Using Java 11’s HttpClient, I implemented a custom SSLContext.

The application loads the PFX certificate using a KeyManagerFactory, ensuring that the private key and certificate chain are correctly presented during the SSL handshake. It also handles the multiple HTTP 302 Redirects that occur during the SAP authentication process.

② UI/UX Enhancements

I moved away from the default, dated look of Java Swing to create a more "professional tool" feel:

Visual Hierarchy: The "START BATCH DOWNLOAD" button uses a deep SAP Blue to guide the user's eye toward the final action.
Dark Mode Console: The log area uses a dark background with high-contrast text, making it easy to monitor the success or failure of each download at a glance.

4. How It Works

Set Paths: Set the base directory (Default: C:\SAP_NOTES).
Authenticate: Select your PFX certificate and enter the password.
Input Notes: Click "Edit Note List" to paste multiple SAP Note numbers.
Execute: Hit the big blue button and watch the real-time logs as files are secured.

The next step for this project? Adding an auto-extraction feature that uses SAPCAR to unpack the .SAR files immediately after download.

System hang caused by http_mlog_list

SAP_BASIS — Tue, 2 Dec 2025 14:21:12 +0900

Firstly, if your system's basis version matches notes 0003059669 and 0003049078, please implement them.
Secondly, please provide the screenshot of the tcode UCON_CHW, I want to know if Context type 1/2/3 are in logging status.

Oracle 19c SAP Bundle Patch 19.29.0.0.251021 - 202511

SAP_BASIS — Mon, 1 Dec 2025 17:24:22 +0900

Set Enviroment Variable

setenv IHRDBMS /oracle/TC2/19.0.0
setenv OHRDBMS /oracle/TC2/19

Prepare media

Extract OPatch and MOPatch

mv $IHRDBMS/OPatch $IHRDBMS/OPatch-pre-SBP_192900251021_202511
unzip -qd $IHRDBMS OPATCH19P_2511-70004508.ZIP -x SIGNATURE.SMF
unzip -qd $IHRDBMS/sapbundle SAP19P_2511-70004508.ZIP 'SBP_192900251021_202511/MOPatch/*'
test -d $IHRDBMS/MOPatch && mv $IHRDBMS/MOPatch $IHRDBMS/MOPatch-pre-SBP_192900251021_202511
mv $IHRDBMS/sapbundle/SBP_192900251021_202511/MOPatch $IHRDBMS/MOPatch

Check Version: OPatch 12.2.0.1.47 and MOPatch 2.12

ora19:oratc2 79> $ORACLE_HOME/OPatch/opatch version
========================================================
GENERIC OPATCH VERSION - FOR USE IN SAP ENVIRONMENT ONLY
========================================================
OPatch Version: 12.2.0.1.47

OPatch succeeded.

ora19:oratc2 80> $ORACLE_HOME/MOPatch/mopatch.sh -h
Invalid or incomplete option specified.
Usage: mopatch [-hvdn] [-o opatch-param] [-j jre]
               [-m make-utility] [-z unzip-utility]
               [-s patch-source-path] [patch-work]

Options:
  -h    show a short command-line overview.  See SAP Note 1027012 for
        complete documentation.
  -v    be verbose; produce more diagnostic output
  -d    dryrun mode; do not deinstall or install any patches

  -s sap-bundle-patch-path
        Install the specified SAP Bundle Patch.  Must be specified exactly
        once.

This utility requires environment variable ORACLE_HOME to be set.

MOPatch - Install Multiple Oracle Patches in One Run - 2.12.
Copyright (c) 2007, 2025, Oracle and/or its affiliates. All rights reserved.

Temporarily change to super user

su root -c "chown `id -u` $IHRDBMS/bin/oradism && chmod u+rw $IHRDBMS/bin/oradism"

Install SAP Bundle Patch

env ORACLE_HOME=$IHRDBMS $IHRDBMS/MOPatch/mopatch.sh -v -s SAP19P_2511-70004508.ZIP

Temporarily change to super user

su root -c "chown root $IHRDBMS/bin/oradism && chmod 4750 $IHRDBMS/bin/oradism"

Set recommedned parameter

ALTER SYSTEM SET "_FIX_CONTROL"=
'5099019:ON','6055658:OFF','6120483:OFF','6399597:ON','6430500:ON','6972291:ON',
'7324224:OFF','7658097:ON','8932139:ON','8937971:ON','9196440:ON','9495669:ON',
'13627489:ON','13699643:OFF','14255600:ON','14595273:ON','18405517:2','20355502:10',
'20636003:OFF','22387320:ON','22540411:ON','23220873:ON','23738304:OFF','24561942:ON',
'25643889:ON','26536320:ON','27321179:ON','27466597:ON','28173995:ON','28234255:3',
'28414968:3','28498976:ON','28558645:ON','28602253:ON','28708585:ON','28835937:ON',
'28999046:ON','29302565:ON','29304314:ON','29385774:ON','29450812:ON','29487407:ON',
'29687220:ON','29867728:ON','29930457:ON','30008456:ON','30018126:ON','30142527:ON',
'30195773:ON','30231086:ON','30235691:ON','30249927:ON','30470947:ON','30483217:ON',
'30537403:ON','30751171:ON','30758835:ON','30776676:ON','30786641:ON','30887435:ON',
'31009032:ON','31072746:ON','31082719:ON','31143146:ON','31266779:ON','31444353:1',
'31487332:ON','31496840:ON','31579233:ON','31821701:ON','31961578:ON','31988833:ON',
'32014520:ON','32107621:ON','32205825:ON','32212062:ON','32302470:ON','32321289:ON',
'32396085:ON','32408640:ON','32578113:ON','32614157:ON','32851615:ON','32874571:ON',
'33297275:ON','33303725:ON','33369863:ON','33547527:ON','34605396:ON','34610498:ON',
'35233495:ON','35330506:ON','35465301:ON','35751181:ON','36004815:OFF','36040099:ON',
'36373163:ON','36446103:ON','36527753:ON','36698344:ON','36769534:ON','36936899:ON',
'36994814:ON','37129294:ON','37651954:ON','37818321:ON'
COMMENT='SAP_192900251021_202511 RECOMMENDED SETTINGS'
SCOPE=SPFILE;

ALTER SYSTEM SET EVENT=
'10027',
'10028',
'10142',
'10183',
'10191',
'10995 level 2',
'38068 level 100',
'38085',
'38087',
'44951 level 1024',
'60025',
'34011029 level 7'
COMMENT='SAP_192000230718_202308 RECOMMENDED SETTINGS'
SCOPE=SPFILE;

Error in invoking target 'libasmclntsh19.ohso libasmperl19.ohso client_sharedlib' of makefile ins_rdbms.mk

SAP_BASIS — Mon, 1 Dec 2025 15:37:40 +0900

OS Environment: SLES 15 SP7

DB Environment: Oracle 19c

INFO:

/usr/bin/ld: cannot find /usr/lib64/libpthread_nonshared.a: No such file or directory

zypper install compat-libpthread-nonshared

ora19:oratc2 41> relink all
writing relink log to: /oracle/TC2/19/install/relinkActions2025-12-01_03-30-18PM.log
ora19:oratc2 42>

Error in invoking target 'agent nmhs' of makefile '$ORACLE_HOME/sysman/lib/ins_emagent.mk'.

SAP_BASIS — Wed, 26 Nov 2025 13:03:38 +0900

OS Environment: SLES12 SP5(x86_x64)

DB Environment: Oracle 11.2.0.4

Exception String: Error in invoking target 'agent nmhs' of makefile '/oracle/TC1/11204/sysman/lib/ins_emagent.mk'.

Edit ins_emagent.mk file

vi $ORACLE_HOME/sysman/lib/ins_emagent.mk

Before

#===========================
#  emdctl
#===========================

$(SYSMANBIN)emdctl:
        $(MK_EMAGENT_NMECTL)

After

#===========================
#  emdctl
#===========================

$(SYSMANBIN)emdctl:
        $(MK_EMAGENT_NMECTL) -lnnz11

When the 'Access unsafe site' option does not appear in Chrome

SAP_BASIS — Mon, 24 Nov 2025 16:21:11 +0900

On the problem page:

Type "thisisunsafe" on your keyboard

(you don’t need to type it in the address bar or any input field).

The page will open automatically.

[HANA] Replication Mode

SAP_BASIS — Wed, 19 Nov 2025 14:29:30 +0900

1. Syncrhonous in-memory (SYNCMEM):

Primary system은 Secondary system이 데이터를 메모리에 저장했다는 응답을 받은 후 트랜잭션을 커밋한다.

Primary system의 트랜잭션 지연 시간이 적다.

Secondary system의 디스크 I/O는 Primary System 성능에 영향을 주지 않는다.

Secondary system과의 연결이 끊어져도 Primary System은 트랜잭션 처리를 계속하고 변경 사항을 로컬 디스크에만 기록한다.

다음의 상황에서 데이터 손실이 발생할 수 있다:

Replication이 활성상태에서 두 시스템(Primary, Secondary)이 동시에 다운되었을 때
Secondary가 동작 불능인 상태에서 Takeover를 수행한 경우

2. Synchronous on disk (SYNC)

Primary system은 데이터가 Secondary system의 Persistant Area(Disk)에 저장된 후 트랜잭션을 커밋한다.

이 옵션은 두 시스템간의 데이터 일치성을 보장하지만 SYNCMEM방식에 비해 지연이 발생한다.

Secondary system과의 연결이 끊어져도 Primary System은 트랜잭션 처리를 계속하고 변경 사항을 로컬 디스크에만 기록한다.

Secondary system과의 연결되어 있는 한 데이터 손실이 발생하지 않는다.

다음의 상황에서 데이터 손실이 발생할 수 있다:

Secondary가 동작 불능인 상태에서 Takeover를 수행한 경우

2.1 Synchronous on disk (FULL SYNC)

SYNC모드에서 [system_replication] enable_full_sync 활성화를 통해 설정

Secondary system과의 연결이 끊어지면(예: network issue) 다시 연결이 재개될 때까지 Primary System의 트랜잭션이 멈춤

Prerequsite additional lib for HANA on SLES

SAP_BASIS — Fri, 22 Aug 2025 17:26:52 +0900

libatomic1

insserv

libltdl7

HANA Studio Usage Tips

SAP_BASIS — Tue, 22 Jul 2025 13:45:39 +0900

1. Representation of NULL Value

Window -> Preperence -> SAP HANA -> Runtime -> Common

2. Increase heap memory

Open hdbstudio.ini: Edit Xmx value

3. Viewing usage heap memory

Window -> Preperence -> Check [Show heap status]

incorrect language display issue

SAP_BASIS — Tue, 17 Jun 2025 09:21:34 +0900

RSLANG20

deleted buffer languages