5 ms·

Can you add a shebang line and have it truly be a script? I do self executing JARs with a bash stub/header all the time, but haven’t tried with this.

• grishka 2y ago
  Sadly you can't, Java doesn't support comments starting with # $ ./shebang.java ./shebang.java:1: error: illegal character: '#' #!/usr/bin/java ^ ./shebang.java:1: error: class, interface, enum, or record expected #!/usr/bin/java ^ 2 errors error: compilation failed Self-executable jars though, that's an interesting idea. No reason why it can't work, zip archives are read from the end, you can put anything in the beginning, including "#!/usr/bin/java -jar"
  • spullara 2y ago
    this has worked since the beginning but i don't think many people know about it
  • jnellis 2y ago
    I believe you can use shebang since java 11 but you can't have the filename extension be .java.
    • grishka 2y ago
      It turns out you indeed can: https://news.ycombinator.com/item?id=40912444 https://news.ycombinator.com/item?id=40912444
  • mbreese 2y ago
    For the self executing JAR, I normally add a bash/shell stub for the header that ends with java -jar $0 The rest of it sets up the environment (JAVA_OPTS, -Xmx, etc).