mvel/mvel

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

1203 stars · 318 forks observed · 2026-08-28

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

MVEL (MVFLEX Expression Language) is an embeddable expression language and runtime for the Java platform, with MVEL3 transpiling expressions to Java source, compiling them in-memory via javac, and executing the resulting bytecode. It also serves as a templating language and is commonly embedded in applications like rule engines for evaluating dynamic expressions.

Use cases

• evaluate dynamic expressions in a Java application
• embed a scripting/expression language in a rule engine
• compile user-supplied expressions to JVM bytecode
• evaluate expressions against POJO properties or maps
• render templates with embedded expressions
• build configurable business rules with expression conditions

When to choose

• you need a Java-syntax-compatible expression language embedded in a JVM application
• you want expressions compiled to bytecode rather than interpreted
• you need templating plus expression evaluation in one library

When to avoid

• you need a stable, battle-tested release (MVEL3 is alpha with changing APIs)
• you will evaluate expressions from untrusted sources (expressions can execute arbitrary JVM operations)
• you need a general-purpose scripting language rather than an expression language

Facets

library · maturity experimental

parser interpreter compiler templating programming-languages developer-tools parsers jvm cross-platform expression-language expression-evaluation rule-engines dynamic-typing transpilation

Member repositories

For agents

markdown · JSON · MCP: product_card(name="mvel/mvel")