A simple Java Agent template with javassist support.
Command line example:
# pass hook arguments via agentArgs.
java -Xmx16G --add-opens java.base/java.lang=ALL-UNNAMED -Xverify:none \
-javaagent:HookAgent.jar=className=com.example.Foo;methodName=bar;methodImplFile=hook.js \
target.jar
# or pass hook arguments via Properties.
java -Xmx16G --add-opens java.base/java.lang=ALL-UNNAMED -Xverify:none \
-javaagent:HookAgent.jar \
-Dhook.className=com.example.Foo \
-Dhook.methodName=bar \
-Dhook.methodImplFile=hook.js \
target.jarThe hook.js example:
{
System.out.println("[agent-hook] skip check: " + new java.util.Date());
return 0;
}