core-lib/xjar

Health v2 · maintenance only

Adoption not part of the score

1807 stars · 502 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

XJar is a Java library and Maven-integrated tool that encrypts Spring Boot and plain JAR files (e.g., with AES) and provides a custom classloader to decrypt them in memory at runtime. It also generates a Go-based launcher binary that embeds tamper checking to keep the decryption password out of the JAR.

Use cases

• encrypt a spring boot jar to prevent decompilation
• protect java source code from being extracted from a jar
• run an encrypted jar with in-memory decryption
• prevent reverse engineering of a java application
• generate a native launcher that hides the jar password
• encrypt only selected classes and resources in a jar

When to choose

• you distribute Spring Boot or plain JARs to customers and want to deter decompilation and source leakage
• you want a no-code-change encryption step applied to an already-built JAR
• you need selectable include/exclude rules for which resources get encrypted

When to avoid

• you need strong cryptographic protection against a determined attacker - runtime in-memory decryption can still be dumped
• your project is not JVM-based or runs on JDK below 1.7
• you need obfuscation rather than encryption - a Java obfuscator may fit better

Facets

library · maturity active

cryptography security build-tool security developer-tools jvm windows cross-platform jar-encryption spring-boot anti-decompilation aes maven-plugin go-launcher java classloader linux macos

Member repositories

For agents

markdown · JSON · MCP: product_card(name="core-lib/xjar")