OpenLiberty/open-liberty
Jun 2025 – Jun 2026
13 Months active
Languages Used
JavapropertiesXML
Technical Skills
Configuration ManagementCryptographyJava EEOAuthOpenID ConnectSecurity
Karel Harjono
PROFILE
Karel Harjono
Over thirteen months, contributed to OpenLiberty/open-liberty by engineering security, authentication, and user management features with a focus on compliance and maintainability. Delivered FIPS 140-3 compliant cryptography, modernized SAML and IdP integration, and enhanced SSL/TLS certificate handling. Refactored APIs for user attribute retrieval, consolidated attribute access, and improved error handling in Java-based backend systems. Addressed token lifecycle security by migrating and hashing SSO logout tokens, optimizing migration throughput, and ensuring backward compatibility. Used Java, XML, and Maven to implement robust configuration management, cryptographic utilities, and automated testing, resulting in improved reliability, regulatory alignment, and streamlined maintenance across the codebase.
Overall Statistics
Feature vs Bugs
69%Features
Repository Contributions
69Total
Bugs
9
Commits
69
Features
20
Lines of code
27,486
Activity Months13
Your Network
1279 peopleSame Organization
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Shared Repositories
139
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Ajay PaulMember
Work History
June 2026
1 Commits
Jun 1, 2026June 2026 monthly summary for OpenLiberty/open-liberty focusing on stability and correctness. Key accomplishments include a bug fix for LTPATokenizer backslash escaping, ensuring correct parsing for tokens containing special characters and proper handling of escaped delimiters. No new user-facing features released this month; the change improves reliability and downstream correctness. Core impact: reduces parsing errors, increases robustness of tokenizer, enabling safer deployments and fewer runtime issues.
1 Commits
Jun 1, 2026June 2026 monthly summary for OpenLiberty/open-liberty focusing on stability and correctness. Key accomplishments include a bug fix for LTPATokenizer backslash escaping, ensuring correct parsing for tokens containing special characters and proper handling of escaped delimiters. No new user-facing features released this month; the change improves reliability and downstream correctness. Core impact: reduces parsing errors, increases robustness of tokenizer, enabling safer deployments and fewer runtime issues.
June 2026
May 2026
3 Commits • 1 Features
May 1, 2026May 2026: OpenLiberty/open-liberty — Delivered logged-out tokens migration enhancements focused on security messaging, throughput, and reliability. The work combines batch processing, performance optimizations, and clear user-facing messaging to accelerate migrations and reduce resource usage during token retirement. Implemented via targeted commits with code-review-driven refinements and performance fixes.
May 2026
3 Commits • 1 Features
May 1, 2026May 2026: OpenLiberty/open-liberty — Delivered logged-out tokens migration enhancements focused on security messaging, throughput, and reliability. The work combines batch processing, performance optimizations, and clear user-facing messaging to accelerate migrations and reduce resource usage during token retirement. Implemented via targeted commits with code-review-driven refinements and performance fixes.
April 2026
1 Commits • 1 Features
Apr 1, 2026April 2026: Delivered token migration and security enhancement for OpenLiberty/open-liberty, migrating logged-out tokens to a hashed format with backward compatibility and adding warnings when legacy tokens are detected to improve security and consistency of token management. This work strengthens token lifecycle security while ensuring a smooth upgrade path and clear auditability.
1 Commits • 1 Features
Apr 1, 2026April 2026: Delivered token migration and security enhancement for OpenLiberty/open-liberty, migrating logged-out tokens to a hashed format with backward compatibility and adding warnings when legacy tokens are detected to improve security and consistency of token management. This work strengthens token lifecycle security while ensuring a smooth upgrade path and clear auditability.
April 2026
March 2026
3 Commits • 1 Features
Mar 1, 2026March 2026 monthly summary for OpenLiberty/open-liberty focused on strengthening SSO logout security and improving maintainability through code reuse. Implemented automatic tracking of logged-out SSO cookies, added token hashing to obfuscate data in caches, and refactored hashing logic into a reusable helper used by both JWT and LTPA logout flows. These changes improve security, reduce risk of token leakage in caches, and lower future maintenance overhead by centralizing hashing logic.
March 2026
3 Commits • 1 Features
Mar 1, 2026March 2026 monthly summary for OpenLiberty/open-liberty focused on strengthening SSO logout security and improving maintainability through code reuse. Implemented automatic tracking of logged-out SSO cookies, added token hashing to obfuscate data in caches, and refactored hashing logic into a reusable helper used by both JWT and LTPA logout flows. These changes improve security, reduce risk of token leakage in caches, and lower future maintenance overhead by centralizing hashing logic.
February 2026
2 Commits • 1 Features
Feb 1, 2026February 2026 — OpenLiberty/open-liberty: Delivered a unified User Attributes API by integrating AttributeReader into UserRegistry, deprecating legacy methods, and optimizing attribute retrieval by using a Set of attribute names to ensure uniqueness and improve performance. Work completed via commits 7ff543b38a5a2e5317f77170ecac42d9287949ea and bd2807528874ac38a8130a15cf09a2a19f71b3fc. This refactor reduces API surface, clarifies responsibility for attribute access, and lays groundwork for future enhancements and migrations.
2 Commits • 1 Features
Feb 1, 2026February 2026 — OpenLiberty/open-liberty: Delivered a unified User Attributes API by integrating AttributeReader into UserRegistry, deprecating legacy methods, and optimizing attribute retrieval by using a Set of attribute names to ensure uniqueness and improve performance. Work completed via commits 7ff543b38a5a2e5317f77170ecac42d9287949ea and bd2807528874ac38a8130a15cf09a2a19f71b3fc. This refactor reduces API surface, clarifies responsibility for attribute access, and lays groundwork for future enhancements and migrations.
February 2026
January 2026
7 Commits • 3 Features
Jan 1, 2026January 2026: Attribute-driven user lookup delivered, beta stability improvements, and codebase cleanup. Implemented a User Attribute Retrieval System with getUsersByAttribute (replacing legacy findUsersByAttribute), added comprehensive fat tests, and enhanced error handling for multiple or missing users. Fixed WIMUserRegistry to throw EntryNotFoundException when a user is not found, improving error clarity and robustness. Introduced a Beta Version Guard for AttributeReader to stabilize beta releases. Refactored SearchBridge for readability and maintainability and performed codebase cleanup including copyright year updates and version bumps. Overall impact: stronger security through attribute-based access, more reliable user management, and reduced technical debt, enabling faster future work.
January 2026
7 Commits • 3 Features
Jan 1, 2026January 2026: Attribute-driven user lookup delivered, beta stability improvements, and codebase cleanup. Implemented a User Attribute Retrieval System with getUsersByAttribute (replacing legacy findUsersByAttribute), added comprehensive fat tests, and enhanced error handling for multiple or missing users. Fixed WIMUserRegistry to throw EntryNotFoundException when a user is not found, improving error clarity and robustness. Introduced a Beta Version Guard for AttributeReader to stabilize beta releases. Refactored SearchBridge for readability and maintainability and performed codebase cleanup including copyright year updates and version bumps. Overall impact: stronger security through attribute-based access, more reliable user management, and reduced technical debt, enabling faster future work.
December 2025
3 Commits • 1 Features
Dec 1, 2025December 2025 — Performance-focused release for OpenLiberty/open-liberty. Delivered a new AttributeReader interface for enhanced user attribute management, fixed SAML authentication compatibility with Java 8 by removing outdated ECDH configurations, and updated copyright year references to 2025 across the codebase. These changes improve security, maintainability, and compatibility, delivering measurable business value and reducing risk across authentication, identity, and legal compliance.
3 Commits • 1 Features
Dec 1, 2025December 2025 — Performance-focused release for OpenLiberty/open-liberty. Delivered a new AttributeReader interface for enhanced user attribute management, fixed SAML authentication compatibility with Java 8 by removing outdated ECDH configurations, and updated copyright year references to 2025 across the codebase. These changes improve security, maintainability, and compatibility, delivering measurable business value and reducing risk across authentication, identity, and legal compliance.
December 2025
November 2025
13 Commits • 4 Features
Nov 1, 2025November 2025 OpenLiberty/open-liberty monthly summary focused on security, authentication, and stability improvements across the codebase. Key features delivered include SAML and IdP integration modernization, SSL/TLS certificate management enhancements, security library upgrades, and testing framework/security configuration cleanup. These changes enhance authentication versatility, strengthen certificate selection, reduce exposure from outdated dependencies, and improve test reliability for future releases.
November 2025
13 Commits • 4 Features
Nov 1, 2025November 2025 OpenLiberty/open-liberty monthly summary focused on security, authentication, and stability improvements across the codebase. Key features delivered include SAML and IdP integration modernization, SSL/TLS certificate management enhancements, security library upgrades, and testing framework/security configuration cleanup. These changes enhance authentication versatility, strengthen certificate selection, reduce exposure from outdated dependencies, and improve test reliability for future releases.
October 2025
12 Commits • 2 Features
Oct 1, 2025Month: 2025-10 | OpenLiberty/open-liberty Overview: Delivered cryptography enhancements and compliance-focused improvements for SAML SSO, with strong emphasis on security posture, test coverage, and maintainability. Focused on delivering business value through robust cryptographic support, regulatory compliance, and maintainable code practices that reduce risk and enable faster iteration on security features. Key features delivered: - SAML SSO Cryptography Enhancements: Implemented support for ECDSA and RSA signing, introduced SHA384/SHA512 algorithms, updated configuration to prefer SHA256, expanded ECDSA test coverage in SAML flows, and improved error handling and test metadata for cryptographic validation. Notable commits included: 8435660..., 312dac0..., e4f86f8..., 470d20a..., 6e6a8bd..., 6e6769e..., b58a42ab..., acf1fc9..., 60981bd4. - FIPS 140-3 Compliance Enforcement and Related Tests: Enforced FIPS-mode cryptographic usage by disallowing RSA-SHA1, added tests for FIPS-mode behavior, and adjusted test coverage to reflect compliance requirements. Notable commits: 1166bd9..., 8ecaa375.... - License Header Update: Updated license/copyright headers to reflect the current year and ensure licensing compliance. Commit: 511db398.... Major bugs fixed: - Fixed failing negative test case using unsuccessfulFlow method (commit acf1fc9de19db731ea276400844d8ec33a5ffb13). - Stabilized test execution around RSA-related paths by correcting test skip logic and ensuring consistent coverage (commits 6e6769e4..., 60981bd4...). - Updated license headers to ensure licensing compliance (commit 511db398...). Overall impact and accomplishments: - Strengthened security posture by extending SAML SSO cryptography with ECDSA/RSA and SHA algorithms, and ensuring FIPS 140-3 compliant usage across flows. - Improved test coverage and reliability for cryptographic pathways, reducing regression risk and enabling safer future enhancements. - Compliance and maintainability improvements reduce licensing risk and align the project with regulatory expectations. Technologies/skills demonstrated: - Public-key cryptography (ECDSA, RSA), SHA algorithms (SHA256/SHA384/SHA512), SAML SSO workflows - FIPS 140-3 compliance enforcement and related testing - Test automation, metadata-driven testing, and negative test case handling - Codebase maintenance, license header management, and test coverage optimization Business value: - Reduced security risk by aligning SAML signing with modern cryptography standards and FIPS requirements. - Lowered operational risk through improved test coverage and stable test execution, enabling faster iteration on security features. - Clear licensing compliance reduces potential legal and distribution risks for downstream users.
12 Commits • 2 Features
Oct 1, 2025Month: 2025-10 | OpenLiberty/open-liberty Overview: Delivered cryptography enhancements and compliance-focused improvements for SAML SSO, with strong emphasis on security posture, test coverage, and maintainability. Focused on delivering business value through robust cryptographic support, regulatory compliance, and maintainable code practices that reduce risk and enable faster iteration on security features. Key features delivered: - SAML SSO Cryptography Enhancements: Implemented support for ECDSA and RSA signing, introduced SHA384/SHA512 algorithms, updated configuration to prefer SHA256, expanded ECDSA test coverage in SAML flows, and improved error handling and test metadata for cryptographic validation. Notable commits included: 8435660..., 312dac0..., e4f86f8..., 470d20a..., 6e6a8bd..., 6e6769e..., b58a42ab..., acf1fc9..., 60981bd4. - FIPS 140-3 Compliance Enforcement and Related Tests: Enforced FIPS-mode cryptographic usage by disallowing RSA-SHA1, added tests for FIPS-mode behavior, and adjusted test coverage to reflect compliance requirements. Notable commits: 1166bd9..., 8ecaa375.... - License Header Update: Updated license/copyright headers to reflect the current year and ensure licensing compliance. Commit: 511db398.... Major bugs fixed: - Fixed failing negative test case using unsuccessfulFlow method (commit acf1fc9de19db731ea276400844d8ec33a5ffb13). - Stabilized test execution around RSA-related paths by correcting test skip logic and ensuring consistent coverage (commits 6e6769e4..., 60981bd4...). - Updated license headers to ensure licensing compliance (commit 511db398...). Overall impact and accomplishments: - Strengthened security posture by extending SAML SSO cryptography with ECDSA/RSA and SHA algorithms, and ensuring FIPS 140-3 compliant usage across flows. - Improved test coverage and reliability for cryptographic pathways, reducing regression risk and enabling safer future enhancements. - Compliance and maintainability improvements reduce licensing risk and align the project with regulatory expectations. Technologies/skills demonstrated: - Public-key cryptography (ECDSA, RSA), SHA algorithms (SHA256/SHA384/SHA512), SAML SSO workflows - FIPS 140-3 compliance enforcement and related testing - Test automation, metadata-driven testing, and negative test case handling - Codebase maintenance, license header management, and test coverage optimization Business value: - Reduced security risk by aligning SAML signing with modern cryptography standards and FIPS requirements. - Lowered operational risk through improved test coverage and stable test execution, enabling faster iteration on security features. - Clear licensing compliance reduces potential legal and distribution risks for downstream users.
October 2025
September 2025
4 Commits • 1 Features
Sep 1, 2025Concise monthly summary for September 2025 focusing on SAML-related work in OpenLiberty/open-liberty. Delivered compatibility improvements for OpenSAML v4, strengthened security handling, expanded test coverage for SAML scenarios, and added test scaffolding for EC Diffie-Hellman (ECDH) workflows. Emphasis on reliability, security, and maintainability to reduce risk and improve compliance.
September 2025
4 Commits • 1 Features
Sep 1, 2025Concise monthly summary for September 2025 focusing on SAML-related work in OpenLiberty/open-liberty. Delivered compatibility improvements for OpenSAML v4, strengthened security handling, expanded test coverage for SAML scenarios, and added test scaffolding for EC Diffie-Hellman (ECDH) workflows. Emphasis on reliability, security, and maintainability to reduce risk and improve compliance.
August 2025
3 Commits • 2 Features
Aug 1, 2025OpenLiberty/open-liberty — August 2025: Security hardening and FIPS readiness. Key work included hardware security provider integration into the crypto path, refactors to CryptoUtils/LTPACrypto/PasswordCipherUtil to the updated API, and removal of the obsolete random() API. Added LTPA v1 FIPS key rotation test coverage (.noFips suffix) with validations for key creation, file output, and version checks. These changes reduce cryptographic complexity, improve provider consistency, and boost production readiness through stronger test coverage and governance of crypto materials.
3 Commits • 2 Features
Aug 1, 2025OpenLiberty/open-liberty — August 2025: Security hardening and FIPS readiness. Key work included hardware security provider integration into the crypto path, refactors to CryptoUtils/LTPACrypto/PasswordCipherUtil to the updated API, and removal of the obsolete random() API. Added LTPA v1 FIPS key rotation test coverage (.noFips suffix) with validations for key creation, file output, and version checks. These changes reduce cryptographic complexity, improve provider consistency, and boost production readiness through stronger test coverage and governance of crypto materials.
August 2025
July 2025
10 Commits • 2 Features
Jul 1, 2025Month: 2025-07. Summary: Focused on strengthening Open Liberty's FIPS 140-3 compliance, secure credential handling for Oracle JDBC, and improving CI reliability in FIPS-enabled environments. Delivered two security-centric features and a set of test-gating changes to reduce flaky tests. These efforts improve security posture, regulatory alignment, and deploy confidence while delivering measurable technical and business value.
July 2025
10 Commits • 2 Features
Jul 1, 2025Month: 2025-07. Summary: Focused on strengthening Open Liberty's FIPS 140-3 compliance, secure credential handling for Oracle JDBC, and improving CI reliability in FIPS-enabled environments. Delivered two security-centric features and a set of test-gating changes to reduce flaky tests. These efforts improve security posture, regulatory alignment, and deploy confidence while delivering measurable technical and business value.
June 2025
7 Commits • 1 Features
Jun 1, 2025June 2025 - OpenLiberty/open-liberty: Strengthened security posture and preserved backward compatibility by delivering FIPS 140-3 compliant hashing upgrades and targeted compatibility fixes across the repository. Key work includes SHA-256 adoption across OAuth/OpenID endpoints, message digests, and Eclipse Persistence integration; selective SHA-1 allowances to support LocalConnector, WebSocket upgrades, and Derby monitor; and MD5 restoration for Hibernate within FIPS 140-3 contexts to preserve CDI and datastore compatibility. These changes enable compliant deployments, reduce risk in token and data integrity flows, and improve interoperability with persistence frameworks.
7 Commits • 1 Features
Jun 1, 2025June 2025 - OpenLiberty/open-liberty: Strengthened security posture and preserved backward compatibility by delivering FIPS 140-3 compliant hashing upgrades and targeted compatibility fixes across the repository. Key work includes SHA-256 adoption across OAuth/OpenID endpoints, message digests, and Eclipse Persistence integration; selective SHA-1 allowances to support LocalConnector, WebSocket upgrades, and Derby monitor; and MD5 restoration for Hibernate within FIPS 140-3 contexts to preserve CDI and datastore compatibility. These changes enable compliant deployments, reduce risk in token and data integrity flows, and improve interoperability with persistence frameworks.
June 2025
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Quality Metrics
Correctness91.8%
Maintainability86.4%
Architecture87.8%
Performance83.2%
AI Usage23.2%
Skills & Technologies
Programming Languages
JavaXMLproperties
Technical Skills
API designAPI developmentBackend DevelopmentBuild ToolsClean CodeCode RefactoringConfigurationConfiguration ManagementCryptographyDatabase IntegrationDependency ManagementFIPS ComplianceFile IntegrityIntegration TestingJDBC
Repositories Contributed To
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