What is Protector4J

VLINX Protector4J is a tool to prevent Java applications from decompilation. Protector4J provides a custom native ClassLoader by modifying the JVM. The Java classes are encrypted by AES and decrypted in the native ClassLoader.

Quick reference

• Maintained by:

  InAccel

• Source of this description:

  inaccel/protector4j repo

How to use this image

You can run a VLINX Protector4J task by using this Docker image directly, passing the Java task parameters to docker run:

$ docker run -it --rm --name my-java-task -u $(id -u):$(id -g) -v $(pwd):/usr/src/myvlinx -w /usr/src/myvlinx inaccel/protector4j \
	--version <jre-version> \
	--email <account-email> \
	--password <md5-of-password> \
	--protect-all \
	jar-path1 jar-path2 ...

Building local Docker image (optional)

This is a base image that you can extend, so it has the bare minimum packages needed. If you add custom package(s) to the Dockerfile, then you can build your local Docker image like this:

$ docker-compose build

Multi-stage Builds

You can build your application with Maven, protect it with Protector4J and package everything in an image that does not include Maven nor Protector4J using multi-stage builds.

# build
FROM maven
WORKDIR /usr/src/app
COPY pom.xml .
RUN mvn -B -e -C -T 1C org.apache.maven.plugins:maven-dependency-plugin:3.1.1:go-offline
COPY . .
RUN mvn -B -e -o -T 1C verify

# protect
FROM inaccel/protector4j
WORKDIR /usr/src/app
COPY --from=0 /usr/src/app .
ARG VLINX_EMAIL
ARG VLINX_PASSWORD
RUN vlinx-protector4j \
	--version 11 \
	--email ${VLINX_EMAIL} \
	--password ${VLINX_PASSWORD} \
	--protect-all \
	target/*.jar

# package without maven, protector4j
FROM debian
ENV JAVA_HOME="/usr/vlinx/jre"
ENV PATH="${JAVA_HOME}/bin:${PATH}"
COPY --from=1 /usr/src/app/jre ${JAVA_HOME}
COPY --from=1 /usr/src/app/target/*.jar ./