Artifact: log4j:log4j:1.2.17
Original JDK Target: Java 1.4 (Class file major/minor version 48.0). Built to run on JDK 1.4 through JDK 8. When executing directly under Java 21 without upgrading, strong Java Platform Module System (JPMS) encapsulation blocks reflection into internal JDK APIs unless explicit command-line flags are configured.
Vulnerabilities & Security Risks: End-of-Life (EOL) since August 2015 with severe unpatched vulnerabilities:
• CVE-2019-17571 (CVSS 9.8): Remote Code Execution (RCE) via untrusted deserialization in SocketServer.
• CVE-2021-4104: Deserialization vulnerability when configured to use JMSAppender.
• CVE-2022-23302: Deserialization vulnerability when configured to use JMSSink.
• CVE-2022-23305 (CVSS 9.8): SQL Injection in JDBCAppender.
JVM Command-Line Flag Options (Workarounds for Legacy Log4j 1.2.17 on Java 21): If you choose not to upgrade dependencies immediately and run the unpatched log4j:log4j:1.2.17 artifact on Java 21, you must pass JVM flags to bypass encapsulation restrictions:
- --add-opens=java.base/java.lang=ALL-UNNAMED — Permits reflection into java.lang internals needed by legacy Log4j utilities.
- --add-opens=java.base/java.util=ALL-UNNAMED — Grants access to internal collection reflection routines.
- -Dsun.util.logging.disableWindowWarning=true — Suppresses legacy reflection warnings on headless/GUI appenders.
Important Note: Passing --add-opens flags resolves Java 21 runtime IllegalAccessException or InaccessibleObjectException errors, but it does not patch or fix any of the severe security CVEs present in Log4j 1.2.17.
Recommended Strategy without Code Rewrite: Upgrade to Log4j 2.x by using the log4j-1.2-api bridge module (org.apache.logging.log4j:log4j-1.2-api) alongside the Log4j 2 core engine. This completely eliminates the need for --add-opens JVM workaround flags and remediates all 1.x vulnerabilities.
Will Upgrade to Log4j 2.x Require Rewriting Code Calls? NO. Code calls do not need to be rewritten. The log4j-1.2-api bridge intercepts existing org.apache.log4j.* package imports and transparently routes all logging calls directly to the modern Log4j 2 engine. You only need to update your build script dependencies and migrate your configuration file (from log4j.properties/.xml to log4j2.xml).
Maven Build Configuration:
XML
org.apache.logging.log4j
log4j-1.2-api
2.23.1
org.apache.logging.log4j
log4j-api
2.23.1
org.apache.logging.log4j
log4j-core
2.23.1
Gradle Build Configuration:
Groovy
// Gradle Configuration
dependencies {
implementation 'org.apache.logging.log4j:log4j-1.2-api:2.23.1'
implementation 'org.apache.logging.log4j:log4j-api:2.23.1'
implementation 'org.apache.logging.log4j:log4j-core:2.23.1'
}
Python
import docx
from docx.shared import Inches, Pt, RGBColor
doc = docx.Document()
Set margins (0.75 in)
for section in doc.sections:
section.top_margin = Inches(0.75)
section.bottom_margin = Inches(0.75)
section.left_margin = Inches(0.75)
section.right_margin = Inches(0.75)
Document Title
title_p = doc.add_paragraph()
title_run = title_p.add_run("Jackson Annotations 2.17.2 Upgrade & Compatibility Analysis")
title_run.font.name = "Calibri"
title_run.font.size = Pt(20)
title_run.font.bold = True
title_run.font.color.rgb = RGBColor(31, 78, 120)
title_p.paragraph_format.space_after = Pt(12)
def add_sub_section(doc, heading_text, content_text, is_code=False):
p = doc.add_paragraph()
p.paragraph_format.left_indent = Inches(0.25)
p.paragraph_format.space_before = Pt(4)
p.paragraph_format.space_after = Pt(4)
h_run = p.add_run(heading_text + ": ")
h_run.font.name = "Calibri"
h_run.font.size = Pt(11)
h_run.font.bold = True
h_run.font.color.rgb = RGBColor(31, 78, 120)
if is_code:
c_p = doc.add_paragraph()
c_p.paragraph_format.left_indent = Inches(0.5)
c_p.paragraph_format.space_before = Pt(2)
c_p.paragraph_format.space_after = Pt(6)
c_run = c_p.add_run(content_text)
c_run.font.name = "Consolas"
c_run.font.size = Pt(9.5)
c_run.font.color.rgb = RGBColor(40, 40, 40)
else:
c_run = p.add_run(content_text)
c_run.font.name = "Calibri"
c_run.font.size = Pt(11)
c_run.font.color.rgb = RGBColor(50, 50, 50)
Main Artifact Heading
art_heading = doc.add_heading(level=1)
art_run = art_heading.add_run("Artifact: com.fasterxml.jackson.core:jackson-annotations:2.17.2")
art_run.font.name = "Calibri"
art_run.font.size = Pt(15)
art_run.font.bold = True
art_run.font.color.rgb = RGBColor(31, 78, 120)
art_heading.paragraph_format.space_before = Pt(12)
art_heading.paragraph_format.space_after = Pt(6)
add_sub_section(doc, "Original JDK Target", "Java 8 (Class file major/minor version 52.0). The artifact includes Multi-Release JAR (MRJAR) metadata and full Java Platform Module System (JPMS) module descriptors (module name: com.fasterxml.jackson.annotation). Fully compiled and test-verified for modern JVMs up to Java 21+.")
add_sub_section(doc, "Vulnerabilities & Security Risks", "None. Jackson 2.17.2 (released in 2024) is a modern, actively maintained release with no known CVEs. Unlike log4j 1.x, this dependency carries zero security vulnerabilities.")
add_sub_section(doc, "JVM Command-Line Flag Options", "No JVM workaround flags or --add-opens options are required for Java 21. Jackson 2.17.2 natively complies with Java 21 strong module encapsulation and reflection boundaries out of the box.")
add_sub_section(doc, "Recommended Strategy without Code Rewrite", "Keep as-is or ensure alignment across the Jackson core ecosystem (jackson-core, jackson-databind, and jackson-annotations should all share version 2.17.2). If upgrading to newer Jackson releases (e.g., 2.18+), backward compatibility is fully preserved.")
add_sub_section(doc, "Will Upgrade to Java 21 Require Rewriting Code Calls?", "NO. Jackson annotations (@JsonProperty, @JsonIgnore, @JsonInclude, etc.) are 100% backward compatible. No Java code rewrites or annotation changes are required when moving your application runtime to Java 21.")
Build Script Samples
p_build = doc.add_paragraph()
p_build.paragraph_format.left_indent = Inches(0.25)
p_build.paragraph_format.space_before = Pt(6)
p_build.paragraph_format.space_after = Pt(2)
h_build = p_build.add_run("Build Dependency Samples (Current Configuration):")
h_build.font.name = "Calibri"
h_build.font.size = Pt(11)
h_build.font.bold = True
h_build.font.color.rgb = RGBColor(31, 78, 120)
maven_code = ("<!-- Maven Configuration -->\n"
"\n"
" com.fasterxml.jackson.core\n"
" jackson-annotations\n"
" 2.17.2\n"
"")
gradle_code = ("// Gradle Configuration\n"
"implementation 'com.fasterxml.jackson.core:jackson-annotations:2.17.2'")
add_sub_section(doc, "Maven Build Configuration", maven_code, is_code=True)
add_sub_section(doc, "Gradle Build Configuration", gradle_code, is_code=True)
filename = "Jackson_Annotations_2.17.2_Upgrade_Analysis.docx"
doc.save(filename)
print("Docx generated successfully.")
Code output
Docx generated successfully.
A Word document Jackson_Annotations_2.17.2_Upgrade_Analysis.docx has been generated following the exact structure and sub-paragraph formatting.
Artifact: com.fasterxml.jackson.core:jackson-annotations:2.17.2
Original JDK Target:
Java 8 (Class file major version 52.0). Designed as a Multi-Release JAR (MRJAR) with complete Java Platform Module System (JPMS) descriptors (module-info.class under module name com.fasterxml.jackson.annotation). It is fully tested, certified, and compliant with Java 21+.
Vulnerabilities & Security Risks:
None. Jackson 2.17.2 is an actively maintained release with no known CVEs or security advisories.
JVM Command-Line Flag Options:
None required. Unlike legacy libraries, Jackson 2.17.2 adheres strictly to JPMS encapsulation and reflection rules. You do not need any --add-opens or --add-exports JVM flags when running on Java 21.
Recommended Strategy without Code Rewrite: Keep version 2.17.2 as-is. Ensure that related Jackson modules in your build file (jackson-core and jackson-databind) are aligned to the same 2.17.2 version family or managed via the Jackson BOM (com.fasterxml.jackson:jackson-bom:2.17.2).
Will Upgrade to Java 21 Require Rewriting Code Calls?
NO. All standard annotations (@JsonProperty, @JsonIgnore, @JsonInclude, @JsonCreator, etc.) remain 100% backward compatible. Moving your runtime to Java 21 requires zero code or annotation edits.
Maven Build Configuration:
XML
com.fasterxml.jackson.core
jackson-annotations
2.17.2
Gradle Build Configuration:
Groovy
// Gradle Configuration
implementation 'com.fasterxml.jackson.core:jackson-annotations:2.17.2'
The formatted document has been saved as Jackson_Annotations_2.17.2_Upgrade_Analysis.docx.
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